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Method for preparing surface coating reinforcing agent for secondary fibre paper

A technology of surface coating and secondary fibers, applied in the directions of reinforcing agent addition, non-fiber pulp addition, fiber raw material treatment, etc. Apply advanced restrictions, unfavorable environment or application effects, etc., to achieve the effects of expanding utilization, solving color crossover, and reducing usage

Inactive Publication Date: 2011-02-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of them can improve the quality of secondary fiber paper to a certain extent, but the molecular main chain of the currently used polymer surface coating agent is mostly straight chain, there is no active group, and it is a single component, which makes it impossible to take care of both Surface strength, folding resistance and solvent resistance, etc.; in addition, organic solvents or surfactants are required in the preparation process, and the foaming property is high, which is not good for the environment or application effect
The above problems limit the expansion and application of secondary fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Preparation of polyoxyethylene maleic anhydride polymerizable emulsifier:

[0019] Mix maleic anhydride and nonylphenol polyoxyethylene ether uniformly at a mass ratio of 8:50, heat up to 60°C, and react for 3 hours to prepare system A; add sodium hydroxide with a mass concentration of 20% to system A Solution to prepare system B, wherein the mass ratio of sodium hydroxide solution to maleic anhydride is 10:5, add water to system B, adjust the solid content of system B to 40%, and obtain polyoxyethylene maleic anhydride polymerizable emulsifier;

[0020] 2) Preparation of nuclear emulsion:

[0021] Mix polyoxyethylene maleic anhydride polymerizable emulsifier with deionized water at a mass ratio of 3:59 to prepare solution C, add octadecyl acrylate and sodium bisulfite to solution C, wherein octadecyl acrylate The mass ratio of sodium bisulfite and C solution is 0.2: 0.1: 62 and the solution D is uniformly stirred, and the temperature is raised to 85°C, and methyl ...

Embodiment 2

[0027] 1) Preparation of polyoxyethylene maleic anhydride polymerizable emulsifier:

[0028] Mix maleic anhydride and nonylphenol polyoxyethylene ether uniformly in a mass ratio of 12:80, heat up to 70°C, and react for 2 hours to prepare system A; add sodium hydroxide with a mass concentration of 20% to system A Solution to prepare system B, wherein the mass ratio of sodium hydroxide solution to maleic anhydride is 20:10, add water to system B, adjust the solid content of system B to 50%, and obtain polyoxyethylene maleic anhydride polymerizable emulsifier;

[0029] 2) Preparation of nuclear emulsion:

[0030]Mix polyoxyethylene maleic anhydride polymerizable emulsifier with deionized water in a mass ratio of 4:70 to prepare solution C, add octadecyl acrylate and sodium bisulfite to solution C, wherein octadecyl acrylate The mass ratio of , sodium bisulfite and C solution is 0.4:0.2:75 and the solution D is evenly prepared by stirring, and the temperature is raised to 73°C, ...

Embodiment 3

[0036] 1) Preparation of polyoxyethylene maleic anhydride polymerizable emulsifier:

[0037] Mix maleic anhydride and nonylphenol polyoxyethylene ether uniformly in a mass ratio of 20:130, heat up to 80°C, and react for 4 hours to prepare system A; add sodium hydroxide with a mass concentration of 20% to system A Solution to prepare system B, wherein the mass ratio of sodium hydroxide solution to maleic anhydride is 30:15, add water to system B, adjust the solid content of system B to 42%, and obtain polyoxyethylene maleic anhydride polymerizable emulsifier;

[0038] 2) Preparation of nuclear emulsion:

[0039] Mix polyoxyethylene maleic anhydride polymerizable emulsifier with deionized water at a mass ratio of 5:80 to prepare solution C, add octadecyl acrylate and sodium bisulfite to solution C, wherein octadecyl acrylate The mass ratio of sodium bisulfite and C solution is 0.6: 0.3: 83 and the solution D is uniformly stirred to obtain solution D, and the temperature is rai...

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Abstract

The invention relates to a method for preparing a surface coating reinforcing agent for secondary fibre paper. The method comprises the following steps: under the emulsifying action of a maleic anhydride polyoxyethylene ester polymeric emulsifying agent, taking a copolymer of soft monomers, such as acrylic acid long-chain fatty ester and the like, as a core (or casing) component, taking a copolymer of hard monomers, such as styrene, methyl methacrylate and the like, as a casing (or core) component, taking an organic silane coupling agent as a core-casing crosslinking component, taking silicasol as a surface reinforcing crosslinking component and preparing a high molecular / inorganic hybridization surface coating reinforcing agent. The product not only can solve various problems caused by the strength decay of the secondary fibre paper, reduce the use quantity of a reinforcing retention aid in pulp and improve the foaming performance, but also can meet the requirement of paper surface properties (such as surface strength, smoothness, oil-taking property, ink-taking property and the like) and overcome the phenomena of hair slipping, powder slipping, cross color and printthrough in multicolor printing, and the like; simultaneously, by the invention, the secondary fibre paper can meet the required indexes of high-grade paper or special type paper, such as the washing resistance andthe solvent resistance of chromatic paper.

Description

technical field [0001] The invention belongs to the field of preparation technology of fine chemicals, and in particular relates to a preparation method of a surface coating reinforcing agent for secondary fiber paper. Background technique [0002] One of the biggest problems when recycling secondary fibers is the continuous loss of fiber strength during the recycling process, which is mainly due to the increase of fine fibers, and the hornification of fibers reduces the bonding properties between fibers. At present, the commonly used secondary fiber paper surface coating enhancer is still the papermaking auxiliary agent used in the original pulp fiber, and there are few studies on the special surface coating agent for secondary fiber. Surface coating agents are divided into two categories: natural polymers and their modified products and synthetic polymers. The former, such as starch and its modified products, carboxymethyl cellulose (CMC), etc., can meet the requirements ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/18D21H17/68D21H17/37
Inventor 费贵强沈一丁王海花李小瑞李刚辉牟静
Owner SHAANXI UNIV OF SCI & TECH
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