Modified cationic latex and preparation method thereof

A cationic and latex technology, applied in the field of cationic latex, can solve the problems of high Cobb value, poor paper strength, slow curing speed, etc., and achieve the effect of reducing Cobb value, simplifying sizing process and rapid curing

Inactive Publication Date: 2012-06-20
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2) Use waste paper instead of wood pulp, but the strength of the paper is poor and the water absorption value is high
[0007] Chinese patent CN1244559A discloses a pre-coating adhesive and its preparation process, although it can reduce the penetration of the photosensitive liquid to the paper base, but the Cobb value of the pre-coated printed paper is too high, and the curing speed is too slow

Method used

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  • Modified cationic latex and preparation method thereof
  • Modified cationic latex and preparation method thereof
  • Modified cationic latex and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a) Mix 70 grams of n-butyl acrylate, 20 grams of styrene and 10 grams of dimethylaminoethyl methacrylate monochloromethane quaternary ammonium to prepare a mixed monomer for subsequent use.

[0027] b) Mix 0.2 g of octadecyl polyoxyethylene (5) trimethylammonium chloride with 10 g of deionized water, dissolve completely, and set aside.

[0028] c) 0.2 g of 2,2'-azobis(amidinopropyl) dihydrochloride and 10 g of deionized water were mixed, completely dissolved, and set aside.

[0029] d) Mix 0.1 gram of borax with 10 grams of deionized water, dissolve completely, and set aside.

[0030] e) Mix 10 grams of gelatin with a molecular weight of 5000 g / mol and 135.75 grams of deionized water, and heat up to 85° C. to dissolve completely. Add the emulsifier aqueous solution in step b) and control it at 95°C, add the 2,2'-azobis(amidinopropyl) dihydrochloride aqueous solution in step c), and then add a dropwise at 95°C ) step to mix the monomers for 1 hour.

[0031] f) Incubat...

Embodiment 2

[0033] a) Mix 30 grams of isooctyl acrylate, 50 grams of methyl styrene and 20 grams of dimethylaminoethyl methacrylate benzyl quaternary ammonium chloride to prepare mixed monomers, and set aside.

[0034] b) Mix 5 grams of lauryl polyoxyethylene (20) trimethylammonium chloride and 10 grams of deionized water, dissolve completely, and set aside.

[0035] c) 2 g of 2,2'-azobis(amidinopropyl) dihydrochloride and 10 g of deionized water were mixed, completely dissolved, and set aside.

[0036] d) Mix 1 gram of borax with 10 grams of deionized water, dissolve completely, and set aside.

[0037] e) Mix 25 grams of gelatin with a molecular weight of 50,000 g / mol and 522 grams of deionized water, and heat up to 85° C. to dissolve completely. Add the emulsifier aqueous solution in step b) and control it at 60°C, add the 2,2'-azobis(amidinopropyl) dihydrochloride aqueous solution in step c), and then add a dropwise at 60°C ) step to mix the monomers for 3 hours.

[0038] f) Incubat...

Embodiment 3

[0040] a) Mix 30 grams of ethyl acrylate, 30 grams of methyl methacrylate, 35 grams of styrene and 5 grams of dimethylaminoethyl methacrylate monochloromethane quaternary ammonium to prepare mixed monomers, and set aside.

[0041] b) Mix 3 grams of cetyl polyoxyethylene (10) trimethylammonium chloride and 10 grams of deionized water, dissolve completely, and set aside.

[0042] c) 1 gram of 2,2'-azobis(amidinopropyl) dihydrochloride and 10 grams of deionized water were mixed, completely dissolved, and set aside.

[0043] d) Mix 0.5 g of borax with 10 g of deionized water, dissolve completely, and set aside.

[0044] e) Mix 18 grams of gelatin with a molecular weight of 20,000 g / mol and 274.5 grams of deionized water, and heat up to 85° C. to dissolve completely. Add the emulsifier aqueous solution in step b) and control it at 80°C, add the 2,2'-azobis(amidinopropyl)dihydrochloride aqueous solution in step c), and then add dropwise a at 80°C ) step to mix the monomers for 2 h...

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Abstract

The invention provides modified cationic latex and a preparation method and application thereof. The preparation method includes the following steps: mixing gelatin aqueous solution, emulsifier aqueous solution and initiator aqueous solution, then adding mixed monomers preferably through the manner of dripping for 1-3 hours, thermally insulating for 1-2 hours at 60-95 DEG C, cooling to room temperature, adding borax aqueous solution, and finally filtering. In this way, modified cationic latex can be obtained. According to the invention, the Cobb value can be remarkably reduced, latex can quickly cure almost after leaving the machine, so the gram weight of paper can be reduced; part or even 100% of waste paper is used to replace wood pulp, thus the sizing treatment process is simplified, the cost is reduced and the quality of the product is improved.

Description

technical field [0001] The invention belongs to the field of papermaking chemicals and relates to a cationic latex. Background technique [0002] The development trend of paper, especially printed paper is as follows: [0003] 1) It is developing from high grammage to low grammage. [0004] 2) Use waste paper instead of wood pulp, but the strength of the paper is poor and the water absorption value is high. [0005] 3) It has become a popular trend to use surface treatment on base paper to make up for the defects of base paper. [0006] Requirements for the latex used for the above surface treatment: a) greatly reduce the Cobb value (water absorption value); b) the curing speed is fast, and it is required to be cooked immediately after getting off the machine. [0007] Chinese patent CN1244559A discloses a pre-coating adhesive and its preparation process, although it can reduce the penetration of photosensitive liquid to the paper base, but the Cobb value of the printed p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/10C08F289/00C08F220/18C08F212/08C08F220/34C08F212/12C08F220/14C08F226/02
Inventor 施晓旦尹东华王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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