WO2015007098A1

WO2015007098A1 - Waterproof recycled paper and production method thereof

Info

Publication number: WO2015007098A1
Application number: PCT/CN2014/072873
Authority: WO
Inventors: 区锦泉
Original assignee: Au Kam Chuen
Priority date: 2013-07-16
Filing date: 2014-03-04
Publication date: 2015-01-22
Also published as: HK1202596A1; JP2016507673A; US20160362842A1; JP6268385B2; CN104641039A; CN104641039B; CN103397559A

Abstract

Provided are waterproof recycled paper and a production method thereof. The waterproof recycled paper is prepared through pulping by using waste paper and papermaking plant fiber raw materials as raw materials, mixing a pulp by adding waterproof additives such as lipid, resin, starch, pectin, a soda pulp, a sulfite pulp, a sulfate pulp, polyacrylonitrile, marble powder, a water-soluble high-molecular polymer, and sodium hydroxide after the pulping process of a papermaking stage, and then, combining a paper production process. For the waterproof recycled paper produced by using the method, the texture of the paper is not changed; and the waterproof recycled paper has the characteristics that the inside and outside of the paper are waterproof, the surface of the paper can be written or printed, and the paper is colorless, nontoxic and tasteless; the paper can be additionally dyed to be any color, but the waterproof function of the paper is not affected; and the paper can be used as packaging paper, writing paper, paper protective clothing, a paper bag and the like, and can be recycled, and is an environment-friendly material.

Description

Waterproof recycled paper and production method thereof

Technical field

[0001] The present invention relates to a paper and a method for producing the same, and in particular to a waterproof recycled paper and a production method thereof, and belongs to the technical field of paper and its production and preparation.

Background technique

[0002] With the development of science and technology, the advancement of society and the continuous improvement of people's living standards, paper is given various functions. In the marine, construction, catering and other industries, some paper materials with waterproof properties, such as nautical map paper, waterproof wrapping paper, fast food box cardboard, water glass paper, paper slippers, waterproof insulation paper or cardboard, are required.

[0003] The waterproof property of the existing paper is generally obtained by adding a waterproofing property to the pulp, such as dipping the base paper, adding heavy oil to the pulp, or the like, or indicating that the coating has waterproof function after the paper is produced. Water repellent. For example, Chinese patent CN1237227C discloses a waterproof and breathable paper which is composed of fiber pulp, heavy oil, fiber pulp including wood fiber pulp, hemp fiber pulp, mulberry fiber pulp, nut fiber pulp, natural bamboo fiber pulp, natural reed fiber pulp. The waterproof and breathable paper is prepared by forming the fiber slurry into a base paper, and after drying, the base paper is coated with a layer of heavy oil in a heavy oil pool. This type of paper has the characteristics of waterproof and breathable tensile strength. However, due to the heavy oil used in the production process, it is necessary to heat the heavy oil raw materials during preparation. At the same time, it is necessary to heat the oil storage tank and coating pool. The drying chamber is heated, the operation procedure is complicated, the steps are cumbersome, and the production cost is increased. Some waterproof papers produced by the prior art have poor water repellency. For repeated use or when the paper surface friction is frequent, the waterproof layer on the surface is damaged or loses water resistance. Some waterproof papers are air permeability. Insufficient toughness or strength, which may cause damage and short service life during use. Some traditional waterproof papers, because of the chemical properties on the surface of the paper, also affect the surface writing, printing and other functions of the paper, some waterproof papers due to the pursuit of its efficient waterproof performance, adding too much chemicals to make the paper Environmental performance is affected.

[0004] Recycled paper is a paper produced by using waste paper as a raw material, crushing it, and decolorizing and pulping through various processes. Recycled paper can be used to produce recycled paper notebooks, wrapping paper and packaging boxes, recycled paper business cards, recycled paper green pencils made from recycled paper as the outer shell of pencil cores, recycled paper and acetate composite cigarette rods. Recycled paper has been widely used in social life because of its energy saving, environmental protection and its advantages in price. At present, there are few reports on waterproof recycled papers for specific waterproof functions.

Summary of the invention

[0005] The present invention is directed to the deficiencies of the prior art, and provides a waterproof recycled paper and a production method thereof. The waterproof recycled paper uses a pulp obtained by mixing waste pulp and plant fiber pulp as a raw material, and passes through an existing paper production process. Waterproofing additives are added to the papermaking section to make the paper waterproof. [0006] The technical solution adopted by the present invention is: a waterproof recycled paper, which is a pulping section of existing paper production, which uses waste paper pulp made from waste paper as raw material and raw material of papermaking plant fiber as raw material. The vegetable fiber slurry obtained by cooking is mixed as a pulp raw material, and washed, screened, bleached, hydrated and refined together; after the beating process of the papermaking section, a waterproof additive is added for slurrying, and the obtained paper material is re-flowed to Paper machine making.

[0007] The water-repellent additive is: oil, resin, starch, pectin, soda, sulfite pulp, kraft pulp, polyacrylonitrile, marble powder, water-soluble polymer, sodium hydroxide.

[0008] The adding of the waterproof additive for the pulping after the beating process of the papermaking section means: in the papermaking section, after the completion of the beating process, the additive containing the following weight percentage of the pulp is added to the pulp: grease 1%~2% 2%~2.5% resin, 1%~2% starch, 1.5%~2% pectin, 1.5%~2% soda sulphate, 1.5%~2% sulfite pulp, 1%~2% sulphate pulp, Polyacrylonitrile 1%~2%, marble powder 1%~2%, water-soluble polymer 1%~2%, sodium hydroxide 2.5%~3.5%.

[0009] The oil and fat is a vegetable oil and fat natural oil, such as soybean oil.

[0010] The resin is a natural resin.

[0011] The water-soluble polymer is a natural water-soluble polymer of starch, cellulose, vegetable gum, animal glue or natural water-soluble modified by natural animal and plant as raw materials. One or more of the high molecular polymers. The chemically modified natural water-soluble polymer mainly includes modified starch and modified cellulose, including carboxymethyl starch, starch acetate, hydroxymethyl cellulose, and carboxymethyl cellulose.

[0012] The weight ratio of the waste paper pulp mixed with the vegetable fiber slurry is: waste paper pulp 35-45%, vegetable fiber pulp 55-65%.

[0013] The plant fiber slurry prepared by cooking raw materials of paper fiber as a raw material, when cooking, the ratio of the dry material to the well water, river water or tap water is 1:3.

[0014] The hydration, refining is to send the mixed slurry after washing, bleaching and washing to the refining system for refining for 30-240 min, and obtaining a enthalpy of 45° SR-48° SR. Pulp.

[0015] The paper machine has a net pulp concentration of 0.1-1.2%.

[0016] The waterproof recycled paper is used in the production of packaging materials, printing materials, decorative materials, and protective materials having waterproof properties.

[0017] The waterproof recycled paper may be directly used as a fiber raw material after being used, and may be directly used as a fiber raw material for regeneration by the preparation process of the present invention, and used for preparing the waterproof recycled paper of the present invention.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

(1) At present, there is no specific form of recycled paper to be a waterproof recycled paper. The innovation of the present invention is that it is a waterproof recycled paper by re-forming the structure.

(2) The current general waterproof paper is obtained by adding a water-repellent surface coating to the surface of the paper to obtain a waterproof effect, but the process may cause the surface of the produced paper to lose the aesthetic or writing ability of the paper, the present invention Waterproof recycled paper is not through The surface coating is waterproof, but the waterproofing function is added in the production process to obtain the waterproof function, so that the appearance and feeling of the paper and the main function of "writing" of the paper are not damaged;

(3) Generally, the waterproof paper has a waterproof function because it is waterproof by the surface coating, and therefore, when it is folded or rubbed a plurality of times, the waterproof layer on the surface thereof is destroyed, and the waterproof effect is lost, and the present invention The waterproof recycled paper itself is a waterproof material and has a long use time;

(4) The waterproof recycled paper of the present invention has the characteristics of being recyclable and environmentally friendly. In the production process, the main raw materials used are plant fiber raw materials, and the added auxiliary materials and materials having waterproof function are selected from resin, pectin and cloud. Natural materials such as stone powder replace the waterproof rubber, waterproof rubber mold, PU, PVC, heavy oil and other chemicals used in traditional waterproof paper. Combined with the general paper production process, the paper can achieve better waterproof performance;

(5) Generally, the waterproof paper can not be written because it is a plastic mold or a non-decomposable substance, and is not easy to be recycled. However, if the waterproof recycled paper of the present invention is sufficiently ground, it can be reused in its production process. Become waterproof recycled paper;

(6) The waterproof recycled paper of the invention has the characteristics of internal and external waterproofing, surface writing or printing, colorless, non-toxic and tasteless, and can be dyed into any color without hindering its waterproof function, and can be used as wrapping paper and writing paper. Paper protective clothing, paper bags, etc., can also be recycled, and is an environmentally-friendly material; the waterproof recycled paper of the present invention uses waste paper as a main raw material to realize recycling of resources, and has a cost advantage.

detailed description

The invention is further explained in the following examples, but the examples are not intended to limit the invention in any way.

[0020] Example 1 The recycled paper of the present invention was processed by the following production method.

[0021] 1. According to the traditional pulping method, the sulphate eucalyptus pulp is produced, wherein the eucalyptus wood chips and the tap water are subjected to sulphate cooking according to a 1:3 mixing ratio; the office waste paper is recovered, sorted, and the hydraulic pulper is used for pulping. The waste paper pulp is obtained, and then the waste paper pulp and the eucalyptus eucalyptus pulp are uniformly mixed according to 35% of the waste paper pulp and 65% by weight of the sulphate eucalyptus pulp to prepare a mixed slurry.

[0022] 2. The mixed slurry is washed, bleached, washed and screened in the original process, and then sent to a refining system for refining for 30 min to obtain a post-mortem slurry having a decomposing degree of 45° SR, concentrated, and set aside.

[0023] 3, in the papermaking section, the prepared pulp sheet is dispersed, decontaminated, and the original seminal pulp, beating process for seminal pulp, beating, after the completion of beating, adding the following percentage by weight of pulp to the pulp Pulping: 1% soybean oil, 2.2% rosin, 1% starch, 2% pectin, 2% soda, 2% sulfite pulp, 2% sulphate pulp, 1% polyacrylonitrile, marble powder 1 %, water-soluble polymer polymer 1%, sodium hydroxide 2.5%.

[0024] 4, the end of the pulping, through the paper stream feeding system paper machine to make, the net pulp concentration is 0.1%, and subsequent pressing, drying, surface treatment, calendering, and finally the sheet forming.

Example 2 The recycled paper of the present invention was processed by the following production method.

[0026] 1, according to the traditional pulping method to produce sulphite wheat straw pulp, wherein the material and the river water according to a ratio of 1: 3, into Purification of sulphite; recycling of office waste paper, sorting, pulping with hydraulic pulper, obtaining waste paper pulp, and then separating waste paper pulp and sulfurous acid according to 40% of waste paper pulp, 60% by weight of sulphite wheat straw pulp The salt wheat straw pulp is uniformly mixed to form a mixed slurry.

[0027] 2. The mixed slurry is washed, bleached, washed and screened in the original process, and then sent to a refining system for refining for 120 min to obtain a post-mortem slurry having a decompression degree of 46° SR, concentrated, and used.

[0028] 3, in the papermaking section, the prepared pulp sheet is dispersed, impurity-removed, and the original seminal pulp, beating process for semi-slurry, beating, after the completion of beating, adding the following percentage by weight of the pulp to the pulp For pulping: soybean oil 2%, rosin 2.5% starch 1.5%, pectin 1.8%, soda pulp 1.5%, sulfite pulp 1.8%, kraft pulp 2%, polyacrylonitrile 1.8%, marble powder 1.5% , water-soluble polymer polymer 2%, sodium hydroxide 3.5%.

[0029] 4, the end of the pulping, through the paper stream feeding system paper machine papermaking, the Internet pulp concentration is 1.2%, and subsequent pressing, drying, surface treatment, calendering, and finally sheet forming.

Example 3 The recycled paper of the present invention was processed by the following production method.

[0031] 1. According to the traditional pulping method, the bagasse pulp is produced, wherein the elm wood chips and the tap water are cooked according to a mixing ratio of 1:3; the office waste paper is recovered, sorted, and the pulp is pulped by a hydraulic pulper to obtain waste paper pulp. Then, the waste paper pulp and the bagasse pulp are uniformly mixed according to 45% of the waste paper pulp and 55% by weight of the bagasse pulp to prepare a mixed slurry.

[0032] 2. The mixed slurry is washed, bleached, washed and screened by the original process, and then sent to a refining system for refining for 240 min to obtain a post-mortem slurry having a decomposed degree of 48° SR, concentrated, and used.

[0033] 3, in the papermaking section, the prepared pulp sheet is dispersed, impurity-removed, and the original seminal pulp, beating process for semi-slurry, beating, after the completion of beating, adding the following percentage by weight of pulp to the pulp Pulping: 1.5% peanut oil, 2% rosin, 1% starch, 1.5% pectin, 1.6% soda ash, 1.5% sulfite pulp, 1.5% sulphate pulp, 1% polyacrylonitrile, 1% marble powder ~2%, water-soluble polymer polymer 1.5%, sodium hydroxide 3%.

[0034] 4, the end of the pulping, through the paper stream feeding system paper machine papermaking, the web pulp concentration of 0.8%, and subsequent pressing, drying, surface treatment, calendering, and finally sheet forming.

Claims

Claim

A waterproof recycled paper characterized in that: it is a pulp pulp produced in an existing paper, a waste paper pulp obtained by using waste paper as a raw material, and a vegetable fiber obtained by cooking raw materials of paper fiber as a raw material. The slurry is mixed as a pulp raw material, and washed, screened, bleached, hydrated and refinished together; after the beating process of the papermaking section, a water-repellent additive is added for slurrying, and the obtained paper material is further sent to a paper machine for papermaking.

2. The waterproof recycled paper according to claim 1, wherein: the waterproof additive is: grease, resin, starch, pectin, soda pulp, sulfite pulp, kraft pulp, polyacrylonitrile, marble Powder, water soluble polymer, sodium hydroxide.

3. The waterproof recycled paper according to claim 1, wherein: adding the water-repellent additive to the pulping process after the beating process of the papermaking section means: in the papermaking section, after the completion of the beating process, in the pulp Adding the following additives in the weight percentage of pulp: 1%~2% of fat, 2%~2.5% of resin, 1%~2% of starch, 1.5%~2% of pectin, 1.5%~2% of soda, sulfite Slurry 1.5%~2%, kraft pulp 1%~2%, polyacrylonitrile 1%~2%, marble powder 1%~2%, water soluble polymer 1%~2%, sodium hydroxide 2.5 %~3.5%.

The waterproof recycled paper according to claim 2 or 3, wherein the oil and fat is a vegetable oil and fat natural oil; the resin is a natural resin; and the water-soluble polymer is natural animal and plant. One or more of starch, cellulose, vegetable gum, animal glue natural water-soluble polymer or chemically modified natural water-soluble polymer obtained by raw material extraction.

5. A waterproof recycled paper according to claim 1, wherein: the weight ratio of the waste pulp to the vegetable fiber slurry is: waste paper pulp 35-45%, vegetable fiber pulp 55-65%.

6. The waterproof recycled paper according to claim 1, wherein: the plant fiber slurry obtained by cooking raw materials of paper-making plant fibers is cooked, and when dried, the dry material and the well water, The ratio of river water or tap water is 1:3.

7. The waterproof recycled paper according to claim 1, wherein: the hydrating and refining are feeding the mixed slurry after washing, bleaching and washing to a refining system for refining 30- At 240 min, a post-mortem slurry with a resolution of 45° SR-48° SR was obtained.

8. A waterproof recycled paper according to claim 1, wherein: said paper machine has a net pulp concentration of 0.1-1.2%.

The waterproof recycled paper according to any one of the preceding claims, wherein the waterproof recycled paper is used in the production of a packaging material having a waterproof property, a printing material, a decorative material, and a protective material.

The waterproof recycled paper according to any one of the preceding claims, wherein: the waterproof recycled paper is recovered and removed after use, and directly used as a fiber raw material, and is applied to the preparation process for regeneration and preparation of waterproof regeneration. paper.