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Aqueous coating composition

A water-based dispersion and emulsion polymer technology, applied in the direction of coating, etc., can solve problems such as difficult to maintain stains

Active Publication Date: 2021-08-24
DOW GLOBAL TECH LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to maintain such liquid repellent stains, for example, the beading score after wet brushing is typically close to zero

Method used

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  • Aqueous coating composition
  • Aqueous coating composition
  • Aqueous coating composition

Examples

Experimental program
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Effect test

example

[0079] Some embodiments of the invention will now be described in the following examples, in which all parts and percentages are by weight unless otherwise indicated. Monomers, materials and their abbreviations are as follows,

[0080] Styrene (ST), 2-ethylhexyl acrylate (2-EHA), hydroxyethyl methacrylate phosphate (PEM), methyl methacrylate (MMA), butyl acrylate (BA), methyl Acrylic acid (MAA) and lauryl methacrylate (LMA).

[0081] HITENOL AR-1025 Surfactant (25% active) (AR-1025) available from Daiichi Kogyo Pharmaceutical Co., Ltd. is polyoxyethylene styrenated allyl phenyl ether ammonium sulfate.

[0082] RHODACAL DS-4 surfactant (active 22%) (DS-4) available from Rhodia (China) Investment Co., Ltd. (Rhodia (China) Investment Co., Ltd.) is dodecyl (branched chain ) sodium benzenesulfonate.

[0083] ADEKA REASOAP SR-1025 reactive surfactant (active 25%) (SR-1025), available from ADEKA (Shanghai) Co., Ltd., is an anionic polymerizable emulsifier, poly (Oxy-1,2-ethanediy...

example 1

[0097] Example 1 Binder

[0098] A monomer emulsion (ME) was prepared by mixing DI water (400 g), AR-1025 (89 g), ST (771.4 g), 2-EHA (606.3 g), LMA (159 g) and PEM (44.4 g). A 5 L four necked round bottom flask equipped with paddle stirrer, thermometer, nitrogen inlet and reflux condenser was charged with DI water (800 g). The contents of the flask were heated to 90°C with stirring under a nitrogen atmosphere. Then, AR-1025 (12.5g), Na 2 CO 3 (5.0 g) and ME (98 g) were added to the flask, followed by the rapid addition of SPS (5.5 g). After holding the batch under stirring for 1 min, the remaining ME was added to the flask while co-feeding the SPS catalyst solution (2.12 g SPS dissolved in 50 g DI water) and the activator solution of sodium bisulfite over 120 min (2.30 g sodium bisulfite dissolved in 50 g DI water). When the ME feed was complete, tert-butyl hydroperoxide (3 g) and isoascorbic acid (1.6 g) were added to the flask over 40 minutes to separately track resi...

example 2

[0099] Example 2 Binder

[0100] A monomer emulsion (ME) was prepared by mixing DI water (400 g), AR-1025 (89 g), ST (788 g), 2-EHA (606.3 g), LMA (159 g) and MAA (32 g). A 5 L four necked round bottom flask equipped with paddle stirrer, thermometer, nitrogen inlet and reflux condenser was charged with DI water (800 g). The contents of the flask were heated to 90°C with stirring under a nitrogen atmosphere. Then, AR-1025 (12.5g), Na 2 CO 3 (5.0 g) and ME (98 g) were added to the flask, followed by the rapid addition of SPS (5.5 g). After keeping the batch under stirring for 1 min, the remaining ME was added to the flask while co-feeding the SPS catalyst solution (2.12 g SPS dissolved in 50 g DI water) and the activator solution of sodium bisulfite over 120 min (2.30 g sodium bisulfite dissolved in 50 g DI water). When the ME feed was complete, tert-butyl hydroperoxide (3 g) and isoascorbic acid (1.6 g) were added to the flask over 40 minutes to separately track residual...

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Abstract

Provided is an aqueous dispersion comprising: based on the dry weight of the emulsion polymer, (A) an emulsion polymer with a Tg of -45 DEG C or more comprising, structural units of a polymerizable surfactant; from 0.3% to 10% of structural units of an ethylenically unsaturated monomer carrying at least one functional group; from 3% to less than 30% of structural units of an alkyl ester of (meth)acrylic acid; and from 65% to 95% of structural units of an additional ethylenically unsaturated nonionic monomer, and (B) more than 1% by solids weight of a wax. Also provided are a method of preparing the aqueous dispersion and an aqueous coating composition comprising the aqueous dispersion.

Description

technical field [0001] The present invention relates to aqueous dispersions and aqueous coating compositions comprising the same. Background technique [0002] Liquid stain repellency is one of the key performance requirements for coating films. Liquid stain repellency is the wettability of a coating film against liquid stains (such as water), the resistance to adhesion of liquid stains on the coating film, and the ease with which liquid stains can be removed from the coating film. [0003] In the coatings industry, a common additive that repels water is wax. Waxes tend to migrate to the surface of the dried coating film and lower the surface tension, improving beading. For interior wall coatings, it is desirable that the coating composition not only provide early water repellency, eg, 2 hours after application of the coating composition, but also provide durable liquid stain repellency. WO2015 / 051514A1 relates to a coating composition comprising i) 12 to 80 dry weight % ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/02C09D133/00
CPCC09D143/02C09D133/12C09D125/14C08F212/08C08F2/26C08F220/14C08F220/1808C08F220/1812C08F230/02C08F220/06C08F212/30C08F220/34C08K5/01C09D133/00C09D133/02C09D7/40
Inventor 钱镇崔巍许建明
Owner DOW GLOBAL TECH LLC