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Organic silicon modified styrene-acrylate microemulsion reinforcing agent as well as preparation method and application thereof

A silicone and microemulsion technology, applied in the direction of reinforcing agent addition, can solve the problems of secondary fiber expansion and application upgrade restrictions, difficulty in meeting high performance requirements of paper, unfavorable environment or application effect, etc., to achieve strong affinity, High product stability, improvement of folding endurance and dry and wet strength

Active Publication Date: 2015-01-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyacrylate surface sizing liquid has good water resistance and strong film-forming performance after treating paper due to its molecular size and adjustable structure. The synthesis process is simple and easy to use, which can endow paper with excellent performance. It has developed rapidly in the modern paper industry, but it is still difficult to meet the high performance requirements of paper, such as high dry and wet strength, folding resistance, surface strength, etc.
In addition, the currently used polyacrylate surface sizing agents need to use organic solvents or small molecule surfactants in the preparation process, which has high foaming properties and is not good for the environment or application effect
The above problems inhibit the complete replacement of internal sizing by surface sizing, and limit the expansion and application of secondary fibers

Method used

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  • Organic silicon modified styrene-acrylate microemulsion reinforcing agent as well as preparation method and application thereof
  • Organic silicon modified styrene-acrylate microemulsion reinforcing agent as well as preparation method and application thereof
  • Organic silicon modified styrene-acrylate microemulsion reinforcing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of organosilicon modified styrene-acrylic microemulsion reinforcing agent comprises the following steps:

[0038] 1) Add metered 5 parts of acrylic acid, 0.2 parts of hydroxyethyl acrylate, 20 parts of butyl acrylate, 40 parts of styrene, and 2 parts of vinyltrimethylsilane into a reactor equipped with a stirrer, a thermometer, and a condensing reflux pipe , 0.2 parts of potassium persulfate as an initiator, after initiating the reaction at 80°C for 1.5 hours, then adding the remaining 0.3 parts of the initiator to continue the reaction for 4 hours;

[0039] 2) Then cool to room temperature, add triethylamine to neutralize until the pH value of the system is 7.5;

[0040] 3) Finally, slowly add 90 parts of deionized water at 80°C under high-speed stirring (1000-3000r / min) for dispersion, and the silicone-modified styrene-acrylic microemulsion enhancer can be obtained.

Embodiment 2

[0042] The preparation method of organosilicon modified styrene-acrylic microemulsion reinforcing agent comprises the following steps:

[0043] 1) Add metered 6 parts of acrylic acid, 0.4 parts of hydroxypropyl methacrylate, 32 parts of hexyl methacrylate, 55 parts of styrene, 3 parts of vinyl Triethoxysilane, 0.25 parts of ammonium persulfate as an initiator, after initiating the reaction at 70°C for 2 hours, then adding the remaining 0.34 parts of the initiator to continue the reaction for 3 hours;

[0044] 2) Then cool to room temperature, add sodium hydroxide to neutralize the system until the pH value is 8;

[0045] 3) Finally, slowly add 108 parts of deionized water at 75°C under high-speed stirring (1000-3000r / min) for dispersion to obtain a silicone-modified styrene-acrylic microemulsion enhancer.

Embodiment 3

[0047] The preparation method of organosilicon modified styrene-acrylic microemulsion reinforcing agent comprises the following steps:

[0048] 1) Add metered 7 parts of acrylic acid, 0.3 parts of methylol acrylamide, 38 parts of n-octyl methacrylate, 63 parts of styrene, and 5 parts of allyl in a reactor equipped with a stirrer, a thermometer, and a condensing return pipe Dimethylchlorosilane, 1.1 parts of hydrogen peroxide as an initiator, after initiating the reaction at 75°C for 1 hour, then add the remaining 0.9 parts of the initiator to continue the reaction for 4 hours;

[0049] 2) Then cool to room temperature, add potassium hydroxide to neutralize to a system pH value of 9;

[0050] 3) Finally, slowly add 178 parts of deionized water at 82°C under high-speed stirring (1000-3000r / min) for dispersion, and the silicone-modified styrene-acrylic microemulsion enhancer can be obtained.

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Abstract

The invention discloses an organic silicon modified styrene-acrylate microemulsion reinforcing agent as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly adding acrylic acid, hydroxyl-containing vinyl monomer, acrylate, styrene and organic silicon functional monomer into a reactor; adding a water-soluble initiator into the reactor for polymerisation; then cooling to room temperature and adding alkali for neutralizing; finally, slowly adding water into the reactor while stirring at a high speed to disperse so as to obtain the organic silicon modified styrene-acrylate microemulsion reinforcing agent. The organic silicon modified styrene-acrylate microemulsion reinforcing agent disclosed by the invention has the advantages of high binding force with paper fibers, good film forming performance and good water resistance and is applied to paper coating. Compared with the common styrene-acrylate emulsion, the organic silicon modified styrene-acrylate microemulsion reinforcing agent disclosed by the invention has the following advantages: the surface strength, folding endurance and wet-and-dry strength of the paper can be obviously improved, no organic solvent or surfactant is added in the preparation process, and the organic silicon modified styrene-acrylate microemulsion reinforcing agent is a high-performance environment-friendly paper-making and printing surface coating reinforcement product.

Description

technical field [0001] The invention belongs to the field of preparation technology of fine chemicals, and in particular relates to an organosilicon-modified styrene-acrylic microemulsion enhancer and a preparation method and application thereof. Background technique [0002] In recent years, due to changes in papermaking raw materials, hardwood pulp, high-yield pulp, secondary fibers, straw pulp, and fillers have been used in large quantities, making it difficult to meet the high requirements for paper surface properties. Based on this, in order to improve the strength of paper and improve its printing adaptability, surface sizing has become an effective method to change paper performance and produce high value-added paper grades. Polyacrylate surface sizing liquid has good water resistance and strong film-forming performance after treating paper due to its molecular size and adjustable structure. The synthesis process is simple and easy to use, which can endow paper with e...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F220/18C08F220/06C08F220/28C08F220/56C08F230/08C08F2/22D21H21/18
Inventor 赖小娟宋沛艳王磊郭兴
Owner SHAANXI UNIV OF SCI & TECH
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