Self-etching cementitious substrate coating composition

A composition and water-based coating technology, applied in coating, thin material handling, transportation and packaging, etc., can solve problems such as permanent failure and delamination

Active Publication Date: 2011-09-14
SWIMC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applied coatings that initially appear to adhere properly, but then delaminate or otherwise fail permanently

Method used

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  • Self-etching cementitious substrate coating composition
  • Self-etching cementitious substrate coating composition
  • Self-etching cementitious substrate coating composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] multistage latex polymer

[0094]Exemplary multistage silane-functionalized, acetoacetyl-functionalized latex polymers can be prepared as follows. Add 500-800 parts of deionized water and 2-6 parts of emulsifier into the reactor. Under nitrogen protection, the reaction mixture was heated to 75-80°C. During heating, a pre-emulsion 1 is formed with 75-250 parts deionized, 2-9 parts emulsifier, 0.2-0.6 parts persulfate initiator, 50-150 parts butyl acrylate, 0-200 parts Parts of methyl methacrylate, 250-450 parts of butyl methacrylate, 0-40 parts of AAEM, 0-15 parts of vinyl silane and 5-30 parts of (meth)acrylic acid. In a separate container, form pre-emulsion 2 with 75-250 parts deionized water, 2-9 parts emulsifier, 0.2-0.6 parts persulfate initiator (e.g. sodium persulfate), 150-500 parts 5-100 parts of methyl methacrylate, 5-100 parts of butyl acrylate, 0-40 parts of AAEM, 0-15 parts of vinyl silane and 5-30 parts of (meth)acrylic acid. After the reaction mixture ...

Embodiment 2

[0096] Multistage Latex Polymers and Epoxy Functional Silanes

[0097] Using the method of Example 1 (but without using vinyl silane in the latex reaction mixture), a multistage latex polymer was prepared from a first monomer mixture comprising butyl acrylate and a second monomer mixture , methyl methacrylate, butyl methacrylate, AAEM and acrylic acid and methacrylic acid, the second monomer mixture comprising butyl acrylate, methyl methacrylate, AAEM and acrylic acid. Use 5 parts AAEM per 100 parts total monomer. Then, mix 100 parts of multistage latex polymer with 0.8 parts of SILQUEST TM A-187 gamma-glycidyloxypropyltriethoxysilane combination. Figure 4 A DSC curve is shown, which shows that the polymer has two different Tg values, a soft stage Tg at about 8.6°C and a hard stage Tg at about 89.3°C. 40% solids, MMFT less than 10°C.

Embodiment 3

[0099] Multistage Latex Polymer Containing Vinylsilane

[0100] Using the method of Example 1, a vinylsilane-functionalized multistage latex polymer was prepared from a first monomer mixture and a second monomer mixture, the first monomer mixture comprising butyl acrylate, methyl methacrylate, Butyl methacrylate, AAEM, SILQUEST A-171 vinylsilane, acrylic acid, and methacrylic acid, the second monomer mixture comprising methyl methacrylate, butyl acrylate, AAEM, A-171 vinylsilane, and acrylic acid . 5 parts of AAEM and 0.8 parts of vinylsilane were used per 100 parts of total monomer. Figure 5 A DSC curve is shown, which shows that the polymer has two different Tg values, a soft stage Tg at about 7.2°C and a hard stage Tg at about 92.5°C. 40% solids, MMFT less than 10°C.

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PUM

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Abstract

Coating compositions for cementitious substrates may be made from a multistage latex polymer; silane; and a water-soluble acid, acid anhydride or acid salt capable of etching or otherwise reacting with the surface of the substrate to provide improved coating adhesion. The silane my be present as a silane coupling agent distinct from the multistage latex polymer, or may be present as silane functionality on the multistage latex polymer. The coating compositions adhere well to cementitious substrates and have a self-etching capability which improves coating adhesion, especially near edges and corners.

Description

Background technique [0001] Hard, abrasion resistant coatings are used on a variety of substrates including cement, wood and porous substrates. Particularly demanding substrates include horizontal substrates such as sidewalks, floor tiles, cement shop floors and decks. Unfortunately, currently, many of the commercial coatings for these substrates suffer from problems such as poor adhesion or poor water resistance (eg, "blush"). [0002] Cementitious and fiber cementitious substrates present additional problems due to the generally required hard wear resistant coatings with excellent adhesion. In the past, this has been addressed by using polymer systems with higher Tg. Unfortunately, solvents with volatile organic content (VOC) often have to be used to achieve proper coagulation of higher Tg polymers into films. Therefore, there is an unmet need to develop waterborne coatings with acceptably low VOC that are hard, blush resistant, abrasion resistant and have excellent adhes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D201/00C08K5/54C09D201/10
CPCC09D143/04C08K5/54Y10T428/31663
Inventor 霍华德·T·基利勒迈克尔·C·维尔德曼布鲁斯·A·约翰逊卡尔·H·韦伯
Owner SWIMC LLC
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