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Method for preparing modified acrylic resin finish

A technology of acrylic resin and finishing agent, applied in the direction of coating, can solve the problems of insufficiency of solvents, limited performance of finishing materials, poor weather resistance, etc., and achieve the effect of high water resistance physical and mechanical properties, excellent physical and mechanical properties, and improved strength.

Inactive Publication Date: 2008-05-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Acrylic resin is the most widely used film-forming substance in leather finishing materials. It has the characteristics of strong adhesion, smooth coating film, brightness, flex resistance, large extensibility and stable structure; but acrylic resin still has the characteristics of "hot stickiness, "Cold and brittle", not resistant to solvents, poor weather resistance and other shortcomings
At the same time, the conventionally used water-emulsion type coating agents are increasingly showing their insurmountable shortcomings: the large-scale use of emulsifiers has a considerable impact on the environment, which limits the further improvement of the performance of coating materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The three-neck flask was heated to 72° C. in a water bath, and 1 part by mass of acrylamide and 95 parts of deionized water were added. After stirring evenly, continue to heat up to 85° C., and then add 7.5 parts by mass of vinyl acetate and 6.5 parts of butyl acrylate. After preheating for 20 minutes, add 15 parts by mass of deionized aqueous solution dissolved with 0.48 parts of potassium persulfate and 0.15 parts of sodium bisulfite directly into the system, and after constant temperature reaction for 2 hours, lower the temperature with concentrated ammonia water with a mass fraction of 25%. pH to neutral, that is, low molecular weight oligomers. Stir the low-molecular oligomer obtained above at a constant temperature in a water bath at 40°C for 20 minutes, add 1 part by mass of tetraethyl orthosilicate and 1.5 parts of organosilane coupling agent, and react at a constant temperature for 20 minutes, then add mass parts It is a mixed monomer of 2.5 parts of butyl acr...

Embodiment 2

[0015] The three-necked flask was heated to 75° C. in a water bath, and 1.5 parts by mass of acrylamide and 95 parts of deionized water were added. After stirring evenly, continue to heat up to 85° C., and then add 7.0 parts by mass of vinyl acetate and 6.5 parts of butyl acrylate. After preheating for 20 minutes, add 18 parts by mass of deionized aqueous solution dissolved with 0.45 parts of potassium persulfate and 0.15 parts of sodium bisulfite directly into the system. After constant temperature reaction for 2 hours, use concentrated ammonia water with a mass fraction of 25% to adjust the temperature. pH to neutral, that is, low molecular weight oligomers. Stir the low-molecular oligomer obtained above at a constant temperature in a water bath at 40°C for 20 minutes, add 1.5 parts by mass of tetraethyl orthosilicate and 2 parts of organosilane coupling agent, react at a constant temperature for 20 minutes, add mass parts of Mixed monomers of 3 parts of butyl acrylate and ...

Embodiment 3

[0017] The three-necked flask was heated to 73° C. in a water bath, and 2 parts by mass of acrylamide and 100 parts of deionized water were added. After uniform stirring, the temperature was continued to rise to 86° C., and then 8.0 parts by mass of vinyl acetate and 7.5 parts of butyl acrylate were added. After preheating for 20 minutes, add 18 parts by mass of deionized aqueous solution dissolved with 0.48 parts of potassium persulfate and 0.2 parts of sodium bisulfite directly into the system, and adjust the temperature with concentrated ammonia water with a mass fraction of 25% after constant temperature reaction for 2 hours. pH to neutral, that is, low molecular weight oligomers. Stir the low-molecular oligomer obtained above at a constant temperature in a water bath at 40°C for 20 minutes, add 1 part by mass of tetraethyl orthosilicate and 2 parts by mass of organosilane coupling agent, and react at a constant temperature for 20 minutes, then add mass parts It is a mixe...

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Abstract

The invention relates to a process for preparing modified acrylic resin coating agent. Acrylic resin belongs to a film forming material, which is used most widely in leather coating materials and characterized by strong adhesive force, smooth film coating, brightness, bending resistance, good extensibility and stable structure. The acrylic resin has the disadvantages of 'hot sticking, cold brittleness', solvent intolerance, poor weather resistance and the like. The invention utilizes ethyl orthosilicate and acrylate monomers as raw materials, synchronously employs sol-gel method and non-soup emulsion polymerization under the condition that low molecular oligomer is taken as a stabilizing agent. In the process of preparing, no emulsifying agent is added, thereby avoiding the effects of isolation, elasticity, ageing resistance, exudation and the like of the emulsifying agent, achieving single and dispersed latex particles of which the surface is clean, enabling film build to have high water resistance and good physical-mechanical properties. Nanometer particle SiO2 generated by synchronously employing sol-gel method is capable of improving intensity, elasticity, ageing resistance and transparency of coating and endows leathers with good hand feeling.

Description

Technical field: [0001] The invention relates to a preparation method of a modified acrylic resin finishing agent, in particular to a preparation method of a nanocomposite leather finishing agent which can be used for leather bottom layer and middle layer finishing. technical background: [0002] The appearance of leather products plays a decisive role in the manufacture of leather products and the choice of consumers , February 6, 2004, Beijing]. Leather finishing can increase the beauty of the leather surface, improve the durability of the leather, correct the surface defects of the leather, and expand the use of the leather. As the top coating material of leather, leather finishing agent has a vital impact on the appearance, hygienic performance and physical and mechanical properties of leather products. At the same time, there are many kinds of leather materials with different performances. As far as the requirements for improving the grade of leather are concerned, un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/00C08F8/00
Inventor 马建中胡静邓维钧郑新建王华金刘分地杨宗邃王勇能
Owner SHAANXI UNIV OF SCI & TECH
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