WO2006089465A1

WO2006089465A1 - Tissue paper with water repellency and method for manufacture thereof

Info

Publication number: WO2006089465A1
Application number: PCT/CN2005/000482
Authority: WO
Inventors: Kai Ling; Yukun Li; Min Fang; Lisa Li; Robin Dell
Original assignee: Chang Sha City Kai Li Packaging Material Ltd.
Priority date: 2005-02-25
Filing date: 2005-04-12
Publication date: 2006-08-31
Also published as: CN1824889A

Abstract

A tissue paper having the properties of water repellency, breathability and preventing penetration under pressure and a method for manufacture thereof are provided. The tissue paper comprises the materials of fibrous pulp and perfluoro alkyl ethyl acrylate polymer useful as water repellent agent. The weight ratio of the fibrous pulp to the perfluoro alkyl ethyl acrylate polymer is from 1000: 3 to 1000: 12.

Description

Environmentally-friendly waterproof, breathable, pressure-resistant, thin-sheet paper and preparation method thereof

Technical field

The invention relates to an environmentally-friendly waterproof and breathable pressure-resistant permeated tissue paper and a preparation method thereof, in particular to an environmentally-friendly waterproof and breathable pressure-resistant oozing sheet for replacing disposable plastics and disposable packaging materials. Paper and its preparation method. Background technique

The waterproof materials currently used in disposable articles and disposable packaging are plastic or composite materials of paper and plastic. As waterproofing materials, they also have the following disadvantages: waterproof but not air permeable; cannot be degraded in the natural environment, and incinerated to produce toxic gases It causes environmental pollution and damages the environment. At present, the market urgently needs an environmentally-friendly waterproof and breathable pressure-resistant tissue paper that can be waterproof, breathable and degradable in the natural environment without damaging the environment.

The leak-proof layer of the disposable absorbent material currently on the market is a plastic film, which is only waterproof. Existing waterproof paper (less than 45g/m ² ), waterproof, and some have breathability, but due to the very small thickness, the pores are relatively large, and the permeation channel is short and straight, so the water is under pressure It is easy to penetrate and cannot achieve waterproof effect. Summary of the invention

The object of the present invention is to provide an environmentally-friendly waterproof and breathable pressure-resistant permeated tissue paper which is completely environmentally-friendly and pure natural plant fiber, and a preparation method thereof, in particular to provide an environmentally-friendly waterproof for use in disposable articles and disposable packaging instead of plastics. The gas-permeable and pressure-resistant permeable paper and the preparation method thereof overcome the defects that the plastic is waterproof, airtight, non-degradable and pollute the environment.

Therefore, an aspect of the present invention provides an environmentally-friendly waterproof and breathable pressure-resistant tissue paper, which comprises the following raw material components: a fiber slurry, a perfluoroalkyl ethyl acrylate polymer waterproofing agent; The weight ratio of the perfluoroalkylethyl acrylate polymer waterproofing agent is:

1

Confirmation T N2005/000482

1000: 3-1000: 12, the weight is less than 35g/m ² .

The raw material component of the environmentally-friendly waterproof, breathable, and pressure-resistant tissue paper of the present invention further comprises from 5% by weight to 20% by weight of the calcium carbonate of the fiber slurry, preferably 17% by weight of calcium carbonate.

In another aspect, the present invention provides the method for environmentally friendly waterproof, breathable, and pressure-resistant tissue paper, which is characterized by comprising the following preparation process steps -

1) Papermaking: According to the papermaking requirements, the pulp is mixed with water for beating. The slurry concentration is controlled at 3.0%-5.0%, the pulping degree is 50-70 ^G SR, and the wet weight is kept at 8.0-llg. Semi-finished paper;

2) Coating: the perfluoroalkyl ethyl acrylate polymer waterproofing agent is diluted with water by weight 1: 9-1: 19, placed in a coating tank, and the paper obtained in step 1) is placed in a coating tank. Dip coating containing perfluorodecyl ethyl acrylate polymer inhibitor;

3) Drying: After the dip-coated paper passes through the pressing roller, the excess perfluoroalkylethyl acrylate polymer waterproofing agent is removed, and the excess perfluoroalkylethyl acrylate polymer waterproofing agent is removed. The paper is dried in the drying cylinder, the control cylinder pressure is 0.3-0.35Mpa, and the control temperature is between 90 °C and 150 °C, and the environmentally-friendly waterproof, breathable and pressure-resistant oozing paper is obtained.

In another aspect, the present invention also provides the use of the environmentally-friendly waterproof, breathable and pressure-resistant tissue paper, which can be applied to sanitary napkins (pads), children's diapers and adult incontinence products instead of plastics (PE membranes). The leakage layer and the plastic (PE film) are replaced as a leak-proof layer in the medical operating table mat and the medical mat.

The environmental protection waterproof, breathable and pressure-resistant permeated tissue paper of the invention can also be applied to the packaging of hotel room supplies (such as toothbrush, comb, soap) instead of plastic (PE film) and paper-plastic composite materials and other non-degradable materials; Cleaning bags in railways and automobile transportation, plastics (PE film) and paper-plastic composite materials and other non-degradable materials on packaging bags for supermarkets and shopping malls; replacing plastics (PE film) and paper-plastic composites on pharmaceutical packaging Materials as well as metal films and other non-degradable materials; replacement of plastic (PE film) and paper-aluminum composites and other non-degradable materials in beverage packaging, food packaging; in pet mats, disposable paper raincoats and bags requiring waterproofing Replace with plastic (PE film) and paper-plastic composite materials and other non-degradable materials; replace plastic (PE film), paper-plastic composite materials and other non-degradable materials on the use or packaging of daily necessities such as disposable tablecloths. detailed description

The present invention is based on the following waterproof and ventilating mechanism: When a drop of liquid is dropped on a solid surface, whether the liquid wets the solid depends on the surface tension of the liquid and the solid, and the waterproof surface rejection can be obtained as long as the critical surface tension of the solid is smaller than the surface tension of the liquid. Water-based, characterized by: water surface tension of 72dyne / _C m, the treatment of paper fibers by perfluorodecyl acrylate polymer, so that the surface tension of the treated fiber is lOdyne / cm, than the surface tension of water It is much smaller, so the treated fiber is not wetted by water and produces a waterproof effect.

Ultrafine active calcium carbonate (average particle size of 0.02-0. 04 μ m) is added to the paper to form pores between the polymer and the filler. These pore diameters are less than 2 μ m, which can prevent water droplets (average The diameter of 100 μ ιη) allows water vapor molecules (average diameter 0. 0004 μ πι) to pass, thereby achieving waterproof and breathable properties. .

Ordinary tissue paper is extremely easy to penetrate because the thickness of the paper is very small, the pores are relatively large, and the permeation passage is short and straight. The tissue paper produced by the method of the invention is entangled in the paper with ultra-fine active calcium carbonate, which can improve the interface structure of the paper, so that the permeation channel is curved than the permeation channel of the unfilled superfine active calcium carbonate plain paper; the calcium carbonate particles absorb water After the molecular swelling, it can fill the capillary pores in the paper, block the permeation channel, enhance the compactness of the paper, and increase the penetration resistance. At the same time, the pore size distribution is different from the ordinary paper without the superfine activated calcium carbonate. Ultrafine activated calcium carbonate has a small number of large pores, a small permeability coefficient, and good impermeability.

The filling material is filled in the gap of the paper fiber, thereby ensuring that the pores in the middle of the paper are repaired, and the maximum pore size is less than 2 μm, thereby ensuring the gas permeability of the paper, and having the performance of resisting pressure and leakage which can meet the requirements of use. The object of the present invention is achieved by the following technical solutions.

The preparation method of the environmental protection waterproof, breathable and pressure-resistant permeated tissue paper of the invention comprises the following steps: mixing the pulp raw material with water to carry out pulping; dissolving; beating; slurry after beating to perform sand removal; screening; concentrating; ; copy pressure; coating; after the rewinding, it is the environmentally friendly waterproof, breathable, pressure-resistant and thin paper products.

In the preparation method of the environmentally-friendly waterproof and breathable pressure-resistant tissue paper of the present invention, when the beating is performed, the slurry concentration is controlled to be 3.0%-5.0%, the pulping degree is 50-70 ^Q SR, and the wet weight is maintained at 8.0-llg; adding a conventional wet strength agent to improve the quality of the finished paper; the weight ratio of the coating to the fiber slurry, the perfluoroalkyl ethyl acrylate polymer waterproofing agent is: 1000: 3 -1000: 12, that is, the perfluoroalkylethyl acrylate polymer water repellent is diluted with water by weight 1: 9-1: 19, placed in a coating tank, and the paper is dip coated with perfluoroalkane in a coating tank. Ethyl acrylate polymer waterproofing agent, the dip-coated paper removes excess perfluoroalkylethyl acrylate polymer waterproofing agent when passing through the squeezing roller, and removes excess perfluorodecylethyl The paper of the acrylate polymer waterproofing agent is dried in a drying cylinder, the controlled air pressure of the dryer is 0.3-0.35 MPa, and the control temperature is between 90 ° C and 150 ° C _; the rewinding is a slitting and rewinding using a conventional high-speed rewinding machine. Install an ultraviolet generator under the paper roll of the winder, and directly irradiate the paper with ultraviolet light. The bacteria in the paper are killed, and after the rewinding, the plastic bag is used as a sterile sealed package to prevent bacteria in the air from infiltrating into the finished paper.

The method of the present invention further comprises: removing sand after the sand removal; adding a conventional wet strength agent after the slurrying to improve the quality of the finished paper.

The method of the present invention further includes: the pulp is a high concentration hydraulic pulp, the pulp has a concentration of 12±2%; the beating is a disc grinding and the pulping concentration is 2.5-4.5%; The sand removal is high concentration sand removal, the feed pressure is 2.5-3 kg/cm ² , and the water pressure is 3-4 kg/cm ² ; the sieve slurry is centrifugal sieve slurry, and the feed pressure is 3 kg/cm. ² ; The slurry is slurried in a slurry tank.

The coating in the method of the present invention further comprises: adding water to the perfluoroalkylethyl acrylate polymer water repellent raw material, uniformly stirring, and coating the paper with perfluoroalkyl ethacrylic acid. Ester polymer waterproofing agent; drying the coated paper; after cooling, it is an environmentally friendly waterproof, breathable, pressure-resistant, tissue-bleached paper.

The method of the present invention further comprises the step of drying the coated paper at a temperature of from 90 to 150. c.

The specific process steps of the method for preparing the environmentally-friendly waterproof and breathable pressure-resistant tissue paper of the present invention are as follows:

Pulping

The fiber is long in length, soft in itself, strong in fiber bonding after paper-making, and high-strength wood pulp. Depending on the product, other kinds of pulp, such as cotton pulp and hemp, which increase the strength, increase the softness of the short fiber. Leaf pulp and so on.

- 2. Beating

Firstly, the selected slurry is put into a high-concentration hydraulic pulper for pulping, and then the pulping machine is used to disintegrate the slurry. The slurry concentration is 4.5%, the dissolving time is 10-15 minutes, and the disintegrated slurry enters 4 trays. Grinding in series with pulp, the concentration of the slurry is 3.5%, and the control currents of the four disc grinding are: 55A, 60A, 60A, 57A;

3. Ingredients

Adding a conventional wet strength agent: melamine-formaldehyde resin or cationic thermosetting synthetic resin PPE can improve the wet strength quality of the finished paper in addition to the flow aid and drainage. Further, calcium carbonate (CaCO ₃ ) is added, and the amount of calcium carbonate added is 5% to 20%, preferably 17% by weight of the wood pulp.

4. Copying

Using a rotary paper machine or a Fourdrinier paper machine, according to the existing mature papermaking process, the paper has a basis weight of 15g/m ² -50 g/m ² and a paper moisture of less than 7%.

5. Coating

The perfluoroalkylethyl acrylate polymer water repellent is diluted with water of 1:9 by weight, placed in a coating tank, and the paper is dip coated with a perfluorodecyl ethacrylate polymer waterproofing agent in a coating tank, paper The speed of the coating tank is 80 meters per minute, and the dip-coated paper passes through the squeezing roller. 005 000482 Remove the excess perfluorodecyl ethacrylate polymer waterproofing agent, remove excess paper containing perfluorodecyl ethacrylate polymer waterproofing agent and dry it into the drying cylinder.

0.3-0.35Mpa, the control temperature is between 110 ° C and 150 ° C, the dried paper is cooled by a water-cooling cylinder, and the dried paper is wound by an automatic reel. The coating includes coating in a paper machine and coating of a coater.

6. Rewinding

The conventional high-speed rewinding machine is used for slitting and rewinding, and an ultraviolet generating device is installed under the paper-feeding roller of the winder. The ultraviolet light directly irradiates the paper to kill bacteria in the paper, and after the rewinding, the plastic bag is aseptically sealed. Packaging to prevent bacteria from penetrating into the finished paper in the air.

In a preferred embodiment of the present invention, 55% of the softwood pulp is used, and the beating degree is controlled at 85-90 degrees. Such beating can ensure that the fiber is fully swelled and controlled, and the fiber distribution of the paper is controlled to be uniform, and 45% is selected. Hardwood pulp, the degree of beating is controlled at 30-35 degrees, then the two slurries are mixed, and the ultrafine active calcium carbonate having a weight of 17% of the absolute dry pulp is added, stirred well, and then copied into paper.

The perfluoromercaptoethyl acrylate polymer water repellent is an emulsion containing a perfluorodecylethyl acrylate polymer. The parameters of the perfluoroalkylethyl acrylate polymer waterproofing agent are:

Appearance Milky emulsion

Ionic nonionic

PH value 3.5 ± 1.5

Solubility easy to dilute and disperse in cold water

Specific gravity 1.07 ±0.04

Solid content 19% ± 1%

Ultra-fine active calcium carbonate is used, and the fine particles are used to improve the structure of the thin paper, so that the permeation channel is curved than the permeation channel of the unfilled superfine active calcium carbonate plain paper; the reinforcing property of activated calcium carbonate and carbonic acid The calcium particles absorb the water molecules and can fill the capillary pores in the paper, block the permeation channel, enhance the compactness of the paper and increase the penetration resistance. At the same time, the pore size distribution and the ordinary paper without the superfine active calcium carbonate are also Different, add superfine work Calcium carbonate has a small number of large pores, a small permeability coefficient, and good impermeability.

The calcium carbonate used in the present invention is an ultrafine active calcium carbonate having the following performance parameters: Molecular formula: CaC0 ₃

Properties: Very fine white fine powder with surface activation treatment with activator or coupling agent for better reinforcement.

Industry Standard: HG/T 2776-1996

The following embodiments may be formed on the basis of the above embodiments, and the embodiments of the present invention are only intended to illustrate and explain the present invention, and are not intended to limit the invention in any sense. Example 1

Use 550kg (dry) of Beimu brand softwood pulp, add 12000kg water, beat with a disc grinder to 89 degrees, put it into the pulp tank for use, take 450kg (extremely dry) Fenghuang broadleaf paddle, add 1000kg water , beat with a disc grinder to 35 degrees, into the pool. Mixed in these two In the slurry tank of the pulp, 170 kg of ultrafine active calcium carbonate was added, and 10 kg of cationic thermosetting synthetic resin PPE was added. Stir thoroughly for 30 minutes, and then use a Fourdrinier paper machine with a width of 1880 mm and a speed of 150 m/min to produce semi-finished paper.

The perfluoroalkylethyl acrylate polymer waterproofing agent is selected, and the water is treated according to the normal use method, and the finished paper is processed. Example 2

The same as in Example 1, except that the beating concentration was controlled at 3.0%, the pulping degree was 60 ^Q SR, and the fiber wet weight was 10 g, and the cationic thermosetting synthetic resin PPE was added in an amount of 0.9% by weight of the dry pulp. Example 3

The same as in Example 1, except that the beating concentration was controlled at 4.0%, the pulping degree was 55 ^Q SR, the fiber wet weight was llg, and the cationic thermosetting synthetic resin PPE was added in an amount of 0.9% by weight of the dry pulp. Example 4

The same as in Example 1, except that the beating concentration was controlled at 3.5%, the pulping degree was 70 ^Q SR, the fiber wet weight was 8.5 g, and the melamine-formaldehyde resin was added in an amount of 1.1% by weight of the dry pulp. The environmental protection waterproof, breathable and pressure-resistant permeated tissue paper of the invention has the following advantages:

Waterproof, breathable, that is, to prevent water from seeping out;

The environmental protection waterproof, breathable and pressure-resistant permeated tissue paper of the invention is made of base paper prepared according to the formula ratio, and a layer of perfluoroalkyl ethyl acrylate polymer waterproofing agent is coated on the base paper, and the material of the plant fiber is natural. Degradable, perfluoroalkyl ethyl acrylate polymer waterproofing agent is non-toxic and harmless, does not cause pollution to the environment, and has environmental advantages. In order to prove the above advantages, the following experiments were conducted on the environmentally-friendly waterproof and breathable pressure-resistant tissue paper of the present invention, which are known methods:

The gas permeability test is tested by the national standard paper permeability test standard. The air permeability test principle is the amount of air passing through the paper in 1 minute under the specified temperature and humidity conditions. The unit of air permeability is ml I min (ml). I points).

Water resistance test, operation steps: Place the paper sample on a cotton cloth or cloth with water absorption, and pour the dyed water onto the paper sample to see the time when the water penetrates the paper and reaches the cotton cloth or the felt.

Non-toxic test, operation steps: Inject the paper sample into the tested drinking water, soak for 24 hours, and then test the immersed drinking water to see if there is any change, and whether there is any toxic substance.

The results are as follows:

Technical features:

1. Air permeability: ^700 ml / min

2. Water resistance: 100 hours

3. Non-toxic test: completely non-toxic

Embodiment 3 is a preferred embodiment of the present invention, and the technical specifications of the finished paper produced are as follows -

Water-resistant leakage test: under normal temperature and normal pressure, use a weight of 10cm and a weight of 2500g for 2min. 2 When the paper of the present invention reaches a gas permeability of 3500 g/m ² . 24 h, the paper can withstand a diameter of 10 cm and a weight of 2500 g for 2 min.

The results of the leakage test of the product after using the environmentally-friendly waterproof and breathable pressure-resistant tissue paper as a leak-proof layer on the pad and the medical care pad are as follows:

Item Gram weight Leak point on the pad Air permeability Nursing pad

(g/m ² ) (point/slice) (g/m ² .24h)

Environmental protection and waterproofing 28 Before pressurization, 5 pieces of all without ^3500 added 500ml Distilled water gas pressure leakage and leakage point appeared, after pressurization (23 ^Q C), pressed 1200g of heavy paper 5 pieces without leakage points 30s no water trace appears; the bottom paper does not leak.

PE gas permeable membrane 35 before pressurization, 5 pieces of all without 2200 ± 400 added 500ml distilled water appeared leakage point, after pressurization (23 ^Q C), pressed 1200g weight 1 piece appeared 1 point 30s no trace of water; leakage

Claims

Claim

An environmentally-friendly waterproof and breathable pressure-resistant tissue paper comprising the following components: a fiber slurry, a perfluoroalkyl ethyl acrylate polymer water repellent; the fiber pulp, containing perfluorodecyl B The weight ratio of the acrylate polymer waterproofing agent is: 1000: 3-1000: 12.

The environmentally-friendly waterproof and breathable pressure-resistant tissue paper according to claim 1, which further comprises 5 to 20% by weight of calcium carbonate based on the fiber slurry.

The environmentally-friendly waterproof and breathable pressure-resistant tissue paper according to claim 2, wherein the calcium carbonate accounts for 17% by weight of the fiber slurry.

A method of preparing an environmentally-friendly waterproof, breathable, and pressure-resistant tissue paper according to claim 1, which comprises the following preparation steps:

1) Papermaking: According to the papermaking requirements, the pulp is mixed with water for beating. The slurry concentration is controlled at 3.0%-5.0%, the pulping degree is 50-70 ^Q SR, and the wet weight is kept at 8.0-llg. Causing semi-finished paper;

2) Coating: the perfluoroalkylethyl acrylate polymer water repellent is diluted with water by weight 1: 9-1: 19, placed in a coating tank, and the paper obtained in step 1) is placed in a coating tank. Dip coating with a perfluoroalkyl ethyl acrylate polymer waterproofing agent;

The method according to claim 4, characterized in that the method further comprises rewinding, using a conventional high-speed rewinding machine for slitting and rewinding, installing an ultraviolet generating device under the paper passing roller of the winder, direct ultraviolet irradiation Paper, killing bacteria in paper.

6. The method according to claim 4; characterized in that the beating concentration is controlled at 4.0%, the pulping degree is 55 ^G SR, and the fiber wet weight is llg.

7. The method according to claim 4; characterized in that: adding a conventional wet strength agent to the ingredients: melamine-formaldehyde resin or cationic thermosetting synthetic resin PPE, which can improve the wetness of the finished paper in addition to the flow aiding and filtering function. Strength quality.

8. A method according to claim 4; characterized in that: 5% by weight to 20% by weight of calcium carbonate, preferably 17% by weight of calcium carbonate, of the fiber slurry is added to the furnish.

9. The use of the environmentally-friendly waterproof, breathable and pressure-resistant permeated tissue paper according to claim 1, wherein: the environmentally-friendly waterproof, breathable, and pressure-resistant tissue paper is applied to a sanitary napkin or pad, a child's diaper, and an adult incontinence product. In terms of replacing the plastic film as a leakage preventing layer.

10. The use of the environmentally-friendly waterproof, breathable and pressure-resistant permeated tissue paper according to claim 1, wherein: the environmentally-friendly waterproof, breathable and pressure-resistant permeated tissue paper is applied to the medical operating table mat and the medical sanitary pad to replace the plastic film. As a leakproof layer.

11. The use of the environmentally-friendly waterproof, breathable and pressure-resistant tissue paper according to claim 1, wherein: the environmentally-friendly waterproof, breathable and pressure-resistant tissue paper is applied to a package of hotel room supplies including a toothbrush, a comb, and a soap. Replace plastic film and paper-plastic composite materials and other non-degradable materials; replace plastic film and paper-plastic composite materials and other non-degradable materials on cleaning bags in aviation, railway and automobile transportation, packaging bags for supermarkets and shopping malls; Replace plastic film and paper-plastic composite materials as well as metal film and other non-degradable materials on pharmaceutical packaging; replace plastic film and paper-aluminum composite materials and other non-degradable materials on beverage packaging and food packaging.

12. The use of the environmentally-friendly waterproof, breathable and pressure-resistant tissue paper according to claim 1, wherein: the environmentally-friendly waterproof, breathable and pressure-resistant tissue paper is applied to a pet mat, a disposable paper raincoat, a medical surgical gown, and a need Replace plastic film and paper-plastic composite materials and other non-degradable materials on the packaging of waterproof articles.

13. The use of the environmentally-friendly waterproof, breathable and pressure-resistant tempered tissue paper according to claim 1, wherein: the environmentally-friendly waterproof, breathable and pressure-resistant tempered tissue paper is applied to replace the plastic film on the use or packaging of disposable articles such as disposable tablecloths. , paper-plastic composites and other non-degradable materials.