WO2017198117A1

WO2017198117A1 - Liquid absorbing and moistureproof paper and preparation method

Info

Publication number: WO2017198117A1
Application number: PCT/CN2017/084156
Authority: WO
Inventors: 姜发堂
Original assignee: 武汉力诚生物科技有限公司
Priority date: 2016-05-18
Filing date: 2017-05-12
Publication date: 2017-11-23
Also published as: CN105926364A; CN105926364B

Abstract

Liquid absorbing and moistureproof paper, comprising: a bottom layer of paper, the surface of which is coated with a binder, binding a water absorbing material thereon; and a cover layer of paper laid on the water absorbing material, the cover layer of paper and the bottom layer of paper being composite molded by means of pressure. The preparation steps for the liquid absorbing and moistureproof paper comprise: (1) applying glue: dissolving corn starch or potato starch in water to prepare a starch glue solution having a concentration of 15%-35%, and spraying the starch glue solution to the surface of the bottom layer of paper by means of a double-roller roll coating machine or a compressed-gas spraying machine, the spraying machine having a pressure of 49-79N; (2) spraying: spraying, by means of a compressed-air sprayer, water absorbing material particles having a particle size of 10-200 mesh to the glue solution layer of the bottom layer of paper, the spray amount being 3-20g/m², the spray pressure being 49-79N; (3) compositing; (4) drying; and (5) cutting. The liquid absorbing and moistureproof paper is capable of absorbing liquid at 5000g/m², and after absorbing water, retaining 95% of the water, and has a fast water-absorption speed, a tensile strength being larger than or equal to 3.0kN/m, and a tensile strength being larger than or equal to 0.4kN/m after water absorption.

Description

Liquid absorbing moisture proof paper and preparation method thereof

Technical field

The invention relates to the technical field of liquid-absorbing and moisture-proof materials, in particular to a liquid-absorbing moisture-proof paper, and also relates to a preparation method of liquid-absorbing moisture-proof paper. Liquid absorbing moisture-proof paper can be used for product quality protection during commodity transportation or commodity storage.

Background technique

In today's era of globalization, international cargo transportation has reached 1 billion standard containers, and the short-distance domestic cargo volume is even greater. Carton packaging goods are generally used during the transportation and storage of goods. The existing cartons are composed of corrugated paper, cardboard paper, white cardboard, etc., which are very sensitive to moisture in the environment, and are highly prone to moisture absorption in the case of humid environment. Once the carton is wet, its strength will be greatly reduced, losing the protection of the goods, affecting the normal circulation of the products and the quality of the packaging. During long-distance or cross-regional material transportation, the temperature and humidity change frequently in the transportation tool or in the small packaging environment, and condensed water will inevitably occur, causing moisture damage to the product. If various electronic products are subjected to humidity change during transportation and storage, even the wetting of liquid water directly leads to a decrease in the stability of electronic components, a decrease in the life of the product, and even safety problems during use. Serious problems such as rust after mechanical parts are wet, and mildew occurs during storage of agricultural and sideline products. Existing moisture absorbing materials such as desiccants and dehumidifying rods can only absorb water vapor in the environment and cannot absorb condensed liquid water generated in the environment. Therefore, the present invention aims to solve the problem of condensed water that cannot be avoided during transportation of goods and storage. The liquid-absorbing moisture-proof paper is laid or wrapped around the product to absorb the condensed water and relatively fix the moisture to protect the commodity. The common loss of goods such as "container fog rain", "cargo sweat" and the like caused by wet damage, after using the product of the invention, can effectively solve the above problems. The product of the invention can also be applied to other fields that need moisture proof and dryness, and achieve the purpose of protecting goods.

Summary of the invention

The object of the present invention is to provide a liquid-absorbing moisture-proof paper having at least three layers of composite structure: the surface layer material allows liquid water and air (including water vapor) to pass quickly, and the material itself has good water absorption at the same time; The macromolecular material with strong water absorption capacity, also known as super absorbent, is fixed in the upper and lower layers of the main structure to quickly absorb and fix the liquid water that is transmitted through the surface layer; the underlying material has a breathable but liquid-impermeable selective permeability. It can prevent liquid water from passing through the underlying material. The moisture-proof paper has a simple structure, is convenient to use, has a strong liquid absorption capability, and prevents liquid from permeating.

Another object of the present invention is to provide a method for preparing a liquid absorbing moisture proof paper. It is made of the following raw materials: surface paper (wood fiber paper, non-woven fabrics, etc.); base paper (wood fiber paper, non-woven fabric, surface sizing); water absorbing material (super absorbent) For example, polyacrylic acid, polyacrylamide, acrylic starch graft copolymer, one or more combinations of konjac glucomannan. The production process of liquid-absorbing moisture-proof paper includes the following steps: applying glue (using a composite device to spray or apply glue on the surface of the bottom paper)---spraying (using a spray head to spray water absorbing particles onto the glue layer of the bottom paper) ---Composite (using composite equipment to laminate the surface paper and the bottom paper together by pressure)---drying (the aforementioned compound The composite paper together contains a certain amount of water, dried by heat to remove moisture)---winding (the composite paper after drying is pulled by the winder to achieve the required paper roll form)---cutting (the aforementioned composite The paper is cut into products of different shapes or sizes)---packaging.

By adopting the material and composition of the present scheme, the prepared composite liquid-repellent moisture-proof paper has strong water absorption characteristics and is permeable to water. The water absorption capacity is 500 g/m ² or more, and the highest is 5000 g/m ² .

In order to achieve the above object, the present invention adopts the following technical solutions:

The invention relates to a liquid-absorbing moisture-proof paper, which is composed of a surface paper, a base paper, an adhesive and a water absorbing material, wherein the upper surface of the bottom paper is coated with an adhesive, the adhesive is bonded to the water absorbing material, and the surface layer paper is laid on the water absorbing material. The surface paper and the bottom paper are formed by pressure composite molding;

The surface paper is a wood fiber paper, a non-woven fabric such as a nonwoven fabric, and the weight per square meter is 30-300 g;

The water absorbing material is one of konjac super absorbent, sodium polyacrylate, polyacrylamide, acrylic starch graft copolymer or 2-4 kinds of compositions in any ratio, and the amount is 3-20 g/m ² , Provide 500-5000g water absorption capacity;

The adhesive is a starch glue, and the amount is 3-50 g/m ² to ensure the connection of the composite structure.

The starch glue is prepared by dissolving corn starch or potato starch in water at a concentration of 15% to 35%.

The bottom paper is a breathable, impervious kraft paper having a weight of 30-300 g per square meter.

A method for preparing a liquid-absorbing moisture-proof paper, the steps of which are:

(1) Gluing: Dissolve corn starch or potato starch in water to prepare a starch glue with a concentration of 15%-35%, and spray a starch glue onto the surface of the bottom paper using a two-roller roll coater or a compressed gas sprayer. The coating pressure is 49-79N;

(2) spraying: using a compressed air spray gun to spray the particles of water-absorbing material with a particle size of 10-200 mesh on the glue layer of the bottom paper, the powder spraying amount is 3-20 g/m ² , and the spraying pressure is 49-79 N;

(3) Compounding: The surface paper and the bottom paper are combined together by pressure to form a composite paper by using a drum type pressure laminating machine or a flat plate pressing type composite machine, and the pressure device provides a pressure of 9.8-490 N, and the composite speed is 5-60 m/ minute.

(4) Drying: heat drying by electric heating (platen dryer) or thermal steam heat exchanger (drum dryer), continuously drying the composite paper at 140-180 °C, and simultaneously baking the composite paper Stable and stable;

(5) Slitting: Cutting with an online cutter to obtain products of different sizes and shapes for different scenes.

The invention has the following advantages and effects:

1. The liquid absorption moisture-proof paper for product protection has strong liquid absorption capacity of 5000g/m ² or above; the water holding capacity after water absorption is high, up to 95%; the bottom paper can prevent liquid water from passing through; the gaseous water can pass freely. Moisture-proof paper; fast water absorption, less than 1.8s/mm. The tensile strength is ≥3.0kN/m, and the tensile strength after water absorption is ≥0.4kN/m.

2. The selected component materials are biodegradable and environmentally friendly;

3. The production process and equipment are simple and easy to operate;

4. Can be formed and cut at will;

5, can be widely used in food, medicine, precision instruments, instruments, clothing shoes and hats, leather, household chemicals, as well as cultural relics, arts and crafts in the transportation and storage of moisture and moisture protection.

DRAWINGS

Figure 1 is a schematic view of a composite liquid-absorbent moisture-proof paper structure.

Figure 2 is a process flow diagram of a composite liquid-absorbent moisture-proof paper device.

Wherein: 1-sheet paper; 2-backing paper; 3-starch glue; 4-water absorbing material; 5-sheet paper uncoiler; 6-bottom paper uncoiler; 7-cutting machine; 8 composite paper; Melting machine (double roll coating machine or compressed gas spraying machine); 10-air compression spray gun; 11-composite machine; 12-dryer; 13-winding machine.

detailed description

The invention is further explained below in conjunction with Figures 1 and 2.

The Konjac superabsorbent selected for use in the following examples was prepared in accordance with Example 1 of the patent (Patent No.: ZL 02 1 47733.7).

Example 1:

(1) Gluing: Dissolving corn starch in water to a starch glue 3 having a concentration of 15%, and using a two-roller roll coater 9 to 150 g/m ² of base paper (kraft paper) on the bottom paper unwinder 6 The coating liquid was applied by rolling, the starch coating amount was 15 g/m ² , and the spraying machine pressure was 50N.

(2) spray material: using compressed air spray gun 10 is sprayed onto the particle size of the glue layer 10 the purpose of water-absorbing material (Konjac super water-absorbing agent) 4, is sprayed in an amount of 10g / m ^2, the spray pressure is 50N.

(3) Recombination: a 110 g/m ² surface paper (lignocellulosic paper) 1 on the surface paper unwinder 5 and a base paper 2 which has been coated with a powder are laminated using a rotary drum press 11 to form a pressure. The overall structure has a pressure of 50 N and a compound speed of 30 m/min.

(4) Drying: The composite paper is continuously passed through the platen dryer 12, and the composite paper is continuously dried at 160 ° C, and the composite paper is stabilized and then wound up by the winder 13 .

(5) Slitting: The dried composite paper 8 is cut into a line width of 1.2 m*1.4 m by a piece cutting machine 7.

The liquid-absorbing moisture-proof paper produced by the above method has a water absorption capacity of 3500 g/m ² according to the method of GB/T461.3. The water-repellent paper for protecting the product absorbs water and has a water holding capacity of 95%; the bottom paper can prevent the liquid water from passing; the gaseous water can pass through the moisture-proof paper freely; the water absorption speed is fast, less than 1.8s/mm. The tensile strength is ≥3.0kN/m, and the tensile strength after water absorption is ≥0.4kN/m.

Example 2:

(1) Gluing: The potato starch is dissolved in water to a starch glue 3 having a concentration of 20%, and the compressed gas spraying machine 9 is used to apply 150 g/m ² of the base paper (kraft paper) 2 on the bottom paper unwinder 6. Rolling glue, the amount of starch glue roll was 10g/m ² , and the sprayer pressure was 70N.

(2) Spraying: A water-absorbent material (sodium polyacrylate) 4 having a particle size of 200 mesh was sprayed onto the glue layer using an air-compression lance 10, the spray amount was 10 g/m ² , and the spray pressure was 70 N.

(3) Complex: using a plate multifunction peripheral pressure plate 11 to 60g / m on the surface of the surface sheet 5 unwinder paper (nonwoven fabric) and a pressure of ² to the base sheet 1 has a composite coating with sprinkled powder, formed integrally The structure has a pressure of 70 N and a recombination speed of 60 m/min.

(4) Drying: The composite paper is continuously passed through a drum dryer, and the composite paper is continuously dried at 140 ° C, and the composite paper is stabilized and then wound up by a winder 13 .

(5) Slitting: The dried composite paper is cut into a width of 1.2 m* and a length of 1.4 m.

The liquid-absorbing moisture-proof paper produced according to the above method has a water absorption capacity of 3000 g/m ² as measured by the method of GB/T461.3. The water-repellent paper for protecting the product absorbs water and has a water holding capacity of 95%; the bottom paper can prevent liquid water from passing through; the gaseous water can pass through the moisture-proof paper freely; the water absorption speed is fast, less than 1.8 s/mm. The tensile strength is ≥3.0kN/m, and the tensile strength after water absorption is ≥0.4kN/m.

Example 3:

(1) Gluing: The corn starch was dissolved in water to a starch glue 3 having a concentration of 35%, and a compressed gas spraying machine 9 was used to feed 210 g/m ² of the base paper (kraft paper) 2 on the bottom paper unwinder 6. Rolling glue, the amount of starch glue roll was 3g/m ² , and the sprayer pressure was 58N.

(2) Spraying: A water-absorbent material (acrylic acid starch graft copolymer) 4 having a particle size of 50 mesh was sprayed onto the glue layer using an air-compression lance 10, the spray amount was 20 g/m ² , and the spray pressure was 58 N.

(3) Recombination: a 30 g/m ² surface paper (nonwoven fabric) 1 on the surface paper unwinder 5 and a base paper 2 which has been coated with a powder are laminated by using a rotary drum press 11 to form a pressure. The overall structure has a pressure of 49 N and a compound speed of 60 m/min.

(4) Drying: The composite paper is continuously dried through a plate-type drier, and the composite paper is continuously dried at 180 ° C, and the composite paper is stabilized and then wound up by a winder 13 .

The liquid-absorbing moisture-proof paper produced according to the above method has a water absorption capacity of 3800 g/m ² according to the method of GB/T461.3. The moisture-absorbing paper for protecting the product absorbs water and has a water holding capacity of 98%; the bottom paper can prevent liquid water from passing through; the gaseous water can pass through the moisture-proof paper freely; the water absorption speed is fast, less than 1.8 s/mm. The tensile strength is ≥3.0kN/m, and the tensile strength after water absorption is ≥0.4kN/m.

Example 4:

(1) Gluing: Dissolving potato starch in water to a starch glue 3 having a concentration of 25%, using a compressed gas spraying machine 9 to a bottom paper (kraft paper) 2 of 30 g/m ² on the bottom paper unwinder 6. Rolling glue, the amount of starch glue roll is 15g/m ² , and the sprayer pressure is 79N.

(2) Spraying: The air-compression spray gun 10 is used to spray a water-absorbing material (konjac super strong water-absorbing agent and sodium polyacrylate) having a particle size of 25 mesh onto the glue layer 4, and the spraying amount is: konjac super strong water absorbing agent 5 g/m ² Sodium polyacrylate 5g/m ² , spray pressure is 79N.

(3) Compounding: The surface paper (nonwoven fabric) 1 of 80 g/m ² on the surface paper unwinding machine 5 and the base paper 2 which has been coated with the powdered powder are pressure-compressed using a rotary drum press 11 to form The overall structure has a pressure of 490 N and a compound speed of 5 m/min.

(4) Drying: The composite paper is continuously passed through a plate-type dryer, and the composite paper is continuously dried at 150 ° C, and the composite paper is stabilized and then wound up by a winder 13 .

The liquid-absorbing moisture-proof paper produced according to the above method has a water absorption capacity of 2800 g/m ² as measured by the method of GB/T461.3. The water-repellent paper for protecting the product absorbs water and has a water holding capacity of 95%; the bottom paper can prevent liquid water from passing through; the gaseous water can pass through the moisture-proof paper freely; the water absorption speed is fast, less than 1.8 s/mm. The tensile strength is ≥3.0kN/m, and the tensile strength after water absorption is ≥0.4kN/m.

Example 5:

(1) Gluing: The potato starch was dissolved in water to a starch glue 3 having a concentration of 30%, and a compressed gas spraying machine 9 was used to feed 300 g/m ² of the base paper (kraft paper) 2 on the bottom paper unwinder 6. glue roller, an amount of starch glue roll 50g / m ^2, a pressure sprayer to 65N.

(2) Spraying: A water-absorbent material (acrylic acid starch graft copolymer) 4 having a particle size of 75 mesh was sprayed onto the glue layer using an air-compression lance 10, the spray amount was 15 g/m ² , and the spray pressure was 65 N.

(3) Recombination: a 300 g/m ² surface paper (nonwoven fabric) 1 on the surface paper unwinding machine 5 and a base paper 2 which has been coated with a powder are laminated by using a drum pressure laminator 11 to form a composite The overall structure has a pressure of 300 N and a compound speed of 40 m/min.

(4) Drying: The composite paper is continuously passed through a plate-type dryer, and the composite paper is continuously dried at 170 ° C, and the composite paper is stabilized and then wound up by a winder 13 .

(7) Packing: Count the cut composite paper and pack it with waterproof plastic film.

The liquid-absorbing moisture-proof paper produced according to the above method was measured to have a water absorption capacity of 4200 g/m ² according to the method of GB/T461.3.

The water-repellent paper for protecting the product absorbs water and has a water holding capacity of 97% or more; the bottom paper can prevent the liquid water from passing through; the gaseous water can pass through the moisture-proof paper freely; the water absorption speed is fast, less than 1.8 s/mm. The tensile strength is ≥3.0kN/m, and the tensile strength after water absorption is ≥0.4kN/m.

Claims

A liquid-absorbing moisture-proof paper comprising: a surface paper, a base paper, an adhesive, a water absorbing material, the upper surface of the bottom paper is coated with an adhesive, the adhesive is bonded to the water absorbing material, and the water absorbing material is Laying the surface paper, the surface paper and the bottom paper are formed by pressure composite molding;

The surface paper is wood fiber paper or non-woven fabric, and the weight per square meter is 30-300 g;

The bottom paper is a breathable, impervious kraft paper having a weight of 30-300 g per square meter.
The liquid absorbent paper according to claim 1, wherein the water absorbing material is one of konjac super absorbent, sodium polyacrylate, polyacrylamide, and acrylic starch graft copolymer. - 4 compositions in any ratio.
A liquid-repellent moisture-proof paper according to claim 1, wherein the binder is corn starch or potato starch dissolved in water to a starch gum having a concentration of 15% to 35%.
A method for preparing a liquid-absorbing moisture-proof paper according to claim 1, wherein the steps are:

(1) Gluing: Dissolve corn starch or potato starch in water to prepare a starch glue with a concentration of 15%-35%, and spray starch glue on the surface of the bottom paper using a two-roller roll coater or a compressed gas spray machine. -50g/m2, the glue pressure is 49-79N;

(2) spraying: using a compressed air spray gun to spray the particles of water-absorbing material with a particle size of 10-200 mesh on the glue layer of the bottom paper, the powder spraying amount is 3-20 g/m 2 , and the spraying pressure is 49-79 N;

(3) Compounding: The surface paper and the bottom paper are combined together by pressure to form a composite paper by using a drum type pressure laminating machine or a flat plate pressing type composite machine, and the pressure device provides a pressure of 9.8-490 N, and the composite speed is 5-60 m/ minute;

(4) Drying: thermal drying is performed by electric heating or thermal steam heat exchange device, and the composite paper is continuously dried at 140-180 ° C, and the composite paper is stereotyped and stabilized;

(5) Slitting: slitting with an online cutter to obtain products of different sizes and shapes.