A kind of environment-friendly high-strength elastic coating and preparation method thereof

An elastic coating, high-strength technology, applied in the direction of coating, etc., can solve the problems of poor mechanical properties and water resistance, and achieve the effect of fast curing speed, good product stability and uniform particle size

Active Publication Date: 2020-07-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a certain gap between the performance of water-based elastic coatings and solvent-based coatings, such as poor mechanical properties and water resistance. How to improve the tensile strength while ensuring high elongation at break of the coating film is also a problem to be solved.

Method used

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  • A kind of environment-friendly high-strength elastic coating and preparation method thereof
  • A kind of environment-friendly high-strength elastic coating and preparation method thereof

Examples

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Effect test

preparation example Construction

[0028] The preparation method of a kind of environment-friendly high-strength elastic paint of the present invention comprises the following steps:

[0029] a, by weight, add 40-50 parts of water, 0.5-1 part of nonionic surfactant, 0.5-1 part of anionic surfactant, 4-8 parts of octamethylcyclotetrasiloxane into the reactor, 0.4~1 part of tetramethyltetravinylcyclotetrasiloxane, react at 70~80°C for 3~4 hours, add 0.2~0.8 parts of hexamethyldisiloxane, continue to react for 2~3 hours, stop Heating and cooling to room temperature can prepare polysiloxane emulsion.

[0030] b. Using polysiloxane emulsion as seed emulsion, add 40-50 parts of polysiloxane emulsion, 1-1.75 parts of alkyl alcohol polyoxyethylene (3) ammonium DNS-18 and 0.5-1 part of polysiloxane emulsion into the reactor. Oxyethylene octylphenol ether-10, mixed solution A was prepared after stirring evenly.

[0031] c. Weigh 60-80 parts of acrylate monomers and 10-40 parts of cross-linking agent monomers. After mix...

Embodiment 1

[0035] a, by weight, add 40 parts of water, 0.5 part of nonionic surfactant, 1 part of anionic surfactant, 4 parts of octamethylcyclotetrasiloxane, 0.8 part of tetramethyltetravinyl For cyclotetrasiloxane, react at 80°C for 2 hours, add 0.2 parts of hexamethyldisiloxane, continue the reaction for 2.5 hours, stop heating, and cool to room temperature to prepare polysiloxane emulsion.

[0036] b, with polysiloxane emulsion as seed emulsion, add 50 parts of polysiloxane emulsion, 1.75 parts of alkyl alcohol polyoxyethylene (3) ammonium DNS-18 and 0.5 part of polyoxyethylene octylphenol ether into the reactor -10, mix solution A after stirring evenly.

[0037] c. Weigh 63.5 parts of acrylate monomers and 34.5 parts of cross-linking agent monomers, mix evenly and add 1 / 10 of the mixed monomers to the mixed solution A, and continue to react at 80°C for 1 Mixed solution B was prepared in 1 hour; then 0.2 parts of water-soluble initiator was dissolved in 20 parts of water to make ini...

Embodiment 2

[0043] a, by weight, add 50 parts of water, 1 part of nonionic surfactant, 0.5 part of anionic surfactant, 8 parts of octamethylcyclotetrasiloxane, 1 part of tetramethyltetravinyl For cyclotetrasiloxane, after reacting at 80°C for 4 hours, add 0.8 parts of hexamethyldisiloxane, continue the reaction for 3 hours, stop heating, and cool to room temperature to prepare polysiloxane emulsion.

[0044] b, with polysiloxane emulsion as seed emulsion, add 40 parts of polysiloxane emulsion, 1 part of alkyl alcohol polyoxyethylene (3) ammonium DNS-18 and 1 part of polyoxyethylene octylphenol ether into the reactor -10, mix solution A after stirring evenly.

[0045] c. Weigh 66 parts of acrylate monomers and 33 parts of cross-linking agent monomers, mix them evenly and add 1 / 10 of the mixed monomers to the mixed solution A, and continue to react at 70°C for 0.5 Mixed solution B was prepared within 1 hour; then 0.3 parts of water-soluble initiator was dissolved in 10 to 30 parts of water...

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Abstract

The invention discloses an environment-friendly high-strength elastic coating and a preparation method thereof. According to the preparation method, octamethyl cyclotetrasiloxane and tetramethyl tetravinyl cyclotetrasiloxane serve as main monomers, hexamethyldisiloxane serves as an end capping agent, and a double-bond polysiloxane emulsion is prepared according to a cationic ring-opening emulsionpolymerization method; the double-bond polysiloxane emulsion serves as a seed emulsion, acrylate monomers and polyfunctional crosslinking monomers serve as main monomers, and chemical bonding is established between polysiloxane and polyacrylate; through introduction of multiple reactive groups, trifunctional monomers and isocyanate curing agents, a three-dimensional crosslinking network structureis set up, and accordingly, the environment-friendly high-strength acrylate multi-crosslinking modified polysiloxane elastic coating is obtained. The prepared acrylate multi-crosslinking modified polysiloxane emulsion has uniform particle diameter and high product stability.

Description

technical field [0001] The invention relates to an elastic coating and a preparation method thereof, in particular to an environment-friendly high-strength acrylate multiple crosslinking modified polysiloxane elastic coating and a preparation method thereof. Background technique [0002] With the improvement of environmental laws and regulations and the strengthening of people's awareness of environmental protection, the scope of use of solvent-based coatings is limited, and research on water-based coatings is increasingly valued. Since the main chain of polyacrylate polymers is a saturated carbon-carbon bond structure, most of them are linear polymers, and their cold resistance, solvent resistance and water resistance are poor. Under certain conditions, they may even decompose, and there is a typical "thermal Sticky, cold and brittle” phenomenon. Polysiloxane is a silicone polymer with Si-O as the main chain, which has high thermal stability, and at the same time, the mole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D151/08C09D101/28C09D7/61C08F283/12C08F220/18C08F220/06C08F220/14C08F220/20C08F222/14C08F218/00C08F222/20C08F220/28C08F220/32C08F220/58C08F20/56C08G77/20
CPCC08F283/124C08K2003/2241C09D7/61C09D151/085C08L1/284C08K3/22C08F220/1804
Inventor 费贵强李焱宇王海花杨晓芳邵彦明朱科
Owner SHAANXI UNIV OF SCI & TECH
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