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Method for preparing surface sizing strengthening agent

A technology of surface sizing and reinforcing agent, applied in the direction of adding reinforcing agent and adding hydrophobic agent, etc., can solve the problems of unsatisfactory effect of high-performance paper, poor affinity of paper fiber, easy occurrence of powder and hair loss, etc. Excellent affinity, increased binding strength, improved brightness and vividness

Inactive Publication Date: 2008-11-12
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can meet the requirements of general paper on strength and sizing degree, but when the amount of filler is large, there will be hair loss and powder loss, which will reduce the strength and water resistance
In addition, polyvinyl alcohol has poor affinity to paper fibers. During the drying process of paper after surface sizing, with the continuous evaporation of water and continuous shrinkage of the film layer, it is easy to cause the film covering the surface of the paper liquid to rupture. Powder shedding and hair loss are easy to occur during the printing process; at the same time, the effect is not ideal for high-performance paper types (such as banknote paper, card paper, sea paper, bond paper, map paper, offset printing paper, white cardboard, striped kraft paper, etc.)
At present, some researchers also use polyvinyl alcohol (PVA) and glutaraldehyde as a surface coating agent for lightly cross-linked products, which have a satisfactory water resistance effect, but they need to be effective under acidic conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Mix ethyl orthosilicate and ethanol uniformly at a molar ratio of 1:10 to prepare solution A; add water dropwise to solution A, wherein the molar ratio of water to ethyl orthosilicate is 3:1, drop The addition time was 2 hours, and solution B was obtained after the dropwise addition; the catalyst sulfuric acid was added dropwise to the solution B, wherein the molar ratio of the catalyst to tetraethyl orthosilicate was 0.1:1, the dropwise addition time was 10 minutes, and the reaction was continued for 40 hours to prepare To obtain silica gel solution C; polyvinyl alcohol 0588 and deionized water were added into a dry reactor at a mass ratio of 10:100, heated to 90° C., kept for 2 hours to completely dissolve the polyvinyl alcohol in the reactor, and then cooled to Prepare polyvinyl alcohol aqueous solution D at 52°C; mix solution C and solution D uniformly at a mass ratio of 400:100 to prepare a surface sizing enhancer.

Embodiment 2

[0014] Example 2: Mix ethyl orthosilicate and isopropanol uniformly at a molar ratio of 1:5 to prepare solution A; add water dropwise to solution A, wherein the molar ratio of water to ethyl orthosilicate is 2:1 , the dropping time is 1 hour. After the dropping is completed, continue to react for 1 hour to obtain solution B; add catalyst hydrochloric acid dropwise to solution B, wherein the molar ratio of catalyst to tetraethyl orthosilicate is 0.01:1, and the dropping time After 50 minutes, continue to react for 20 hours to prepare silica gel solution C; add polyvinyl alcohol 1099 and deionized water in a dry reactor at a mass ratio of 15:100, heat to 80°C, and keep the temperature for 1 hour to make the After the polyvinyl alcohol is completely dissolved, the temperature is lowered to 55°C to obtain a polyvinyl alcohol aqueous solution D; the solution C and the solution D are mixed evenly at a mass ratio of 50:100 to obtain a surface sizing enhancer.

Embodiment 3

[0015] Example 3: Mix ethyl orthosilicate with ethanol and isopropanol in any proportion at a molar ratio of 1:5 to prepare solution A; add water dropwise to solution A, wherein water and orthosilicic acid The molar ratio of ethyl ester is 5: 1, and the dropping time is 0.8 hours. After the dropping is completed, the reaction is continued for 2 hours to obtain solution B; the catalyst acetic acid is added dropwise in the solution B, wherein the catalyst and ethyl orthosilicate The molar ratio is 0.001:1, the dropping time is 30 minutes, and the reaction is continued for 6 hours to prepare silica gel solution C; add polyvinyl alcohol 1750 and deionized water into the dry reactor at a mass ratio of 18:100, and heat to 100°C After 3 hours of heat preservation to completely dissolve the polyvinyl alcohol in the reactor, the temperature was lowered to 63°C to obtain a polyvinyl alcohol aqueous solution D; the solution D and the cationic etherifying agent 3-chloro-2-hydroxypropyl tri...

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Abstract

The invention discloses a preparation method of a paper surface sizing and reinforcing agent, which comprises the following steps: firstly triggers the hydrolytic condensing reaction of a certain amount of ethyl orthosilicate under the action of a catalyst and produces silicasol with different hydrolytic degree by controlling the dosage of the catalyst; the surface sizing and reinforcing agent can be obtained by combining an aqueous solution of polyvinyl alcohol with the silicasol with different hydrolytic degree. The preparation method of the paper surface sizing and reinforcing agent has simple technique and convenient operation, the product of the paper surface sizing and reinforcing agent simultaneously has a three-dimensional organic polymer network structure and a three-dimensional inorganic interpenetrating network structure, not only has polymer flexibility, but also has inorganic rigidness and wear resistance, and as the molecule structure contains a large amount of activated radicals, the product of the paper surface sizing and reinforcing agent has good water-proof property, ink receptivity and film forming performance, can greatly improve the water-proof property, superficial strength and detergent resistance of paper, and can solve the problem of fluff and powder picking.

Description

technical field [0001] The invention belongs to the field of fine chemicals preparation technology, and in particular relates to a preparation method of a polymer / inorganic hybrid paper surface sizing enhancer. Background technique [0002] Polyvinyl alcohol is a unique water-soluble polymer, non-toxic and harmless, due to its excellent adhesion, flexibility, smoothness, oil and solvent resistance, gas barrier properties, abrasion resistance, protective colloid and other properties And be widely used. It is also resistant to mineral oils, greases, lubricants and most organic solvents. Polyvinyl alcohol (PVA) is the most used polymer surface sizing agent, often mixed with starch. It can meet the requirements of general paper on strength and sizing degree, but when the amount of filler is large, there will be hair loss and powder loss, which will reduce the strength and water resistance. In addition, polyvinyl alcohol has poor affinity to paper fibers. During the drying pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H21/18
Inventor 王海花沈一丁费贵强李小瑞
Owner SHAANXI UNIV OF SCI & TECH
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