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Water-based acrylic resin for construction machinery paint and preparation method thereof

A water-based acrylic and engineering machinery technology, applied in the direction of coating, can solve the problems of poor water resistance, decreased water solubility of resin, difficult operation, etc., and achieves the effects of good comprehensive performance, improved water resistance and high gloss.

Active Publication Date: 2022-07-15
SHANGHAI RESIN FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the restrictions on the use of traditional solvents, the performance of water-based acrylic resins on the market is still far behind that of traditional solvent-based resins, especially in the use of engineering machinery paints
When the water-based construction machinery coating is sprayed in wet weather, the water resistance of the paint film is poor after drying, and it is prone to rust on the cast iron substrate when it encounters water, and the gloss decreases; for the modified acrylic resin, the water solubility often decreases ( Affect compatibility with water-based colorants) or limited improvement in water resistance
For example, when the current technology is modified by adding a silicone coupling agent, the water resistance is insufficient due to the insufficient length of the silicone chain; when the epoxy resin is modified alone, the acrylic acid monomer will be consumed, resulting in a rapid decline in the water solubility of the resin; Component cross-linked curable acrylic resin can meet the above problems to a certain extent, but it is inconvenient to use, especially when it is used for spraying construction, it is difficult to operate, which seriously affects its application range
[0004] In summary, the existing various one-component water-based acrylic resins fail to solve the balance of various properties, especially water resistance (use performance) and water solubility (paint performance)
In addition, the glossiness of the resin on the market is not high

Method used

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  • Water-based acrylic resin for construction machinery paint and preparation method thereof
  • Water-based acrylic resin for construction machinery paint and preparation method thereof
  • Water-based acrylic resin for construction machinery paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] ①Preparation of organosilicon coupling agent hydrolyzate: under nitrogen protection, mix 8 parts of 3-(methacryloyloxy)propyldimethylethoxysilane and 1.3 parts of deionized water in a four-necked flask, Under the stirring of 250r / min at 0℃, hydrolyze for 1h, remove the low molecular weight compound ethanol and water under -0.08Mpa vacuum for 1h, and let stand to obtain an organosilicon coupling agent with a viscosity of 300mPa·s (25℃) hydrolyzate.

[0040] ② Add 80 parts of propylene glycol butyl ether into the four-necked flask, and after the temperature is raised to 142 °C, under stirring at 300 r / min, dropwise add 40 parts of methyl methacrylate, 30 parts of styrene, 20 parts of butyl acrylate, 5 Parts of acrylic acid, 1.2 parts of di-tert-butyl peroxide, 1 part of mercaptoethanol and 8 parts of organosilicon coupling agent hydrolyzate prepared in step ① were added dropwise for a total of 5h, then the temperature was raised to 145°C, reacted for 1h, and finally The ...

Embodiment 2

[0043]①Preparation of organosilicon coupling agent hydrolyzate: under nitrogen protection, mix 10 parts of 3-(methacryloyloxy)propyldimethylmethoxysilane and 1.6 parts of deionized water in a four-necked flask, Under stirring at 5°C and 300r / min, hydrolyze for 1.5h, remove low molecular weight compounds methanol and water for 1.5h under -0.10MPa vacuum degree, and let stand to obtain an organosilicon with a viscosity of 400mPa·s (25°C). Joint agent hydrolyzate.

[0044] ②In the four-necked flask, add 70 parts of ethylene glycol butyl ether first, and after the temperature is raised to 143 °C, dropwise add 45 parts of methyl methacrylate, 30 parts of styrene, and 15 parts of butyl acrylate under stirring at 250 r / min. , 5 parts of acrylic acid, 2.4 parts of di-tert-butyl peroxide, 2 parts of dodecyl mercaptan and 10 parts of organosilicon coupling agent hydrolyzate prepared in step ① was added dropwise for a total of 5.5h, and then heated to 150 ℃, react for 3h, and finally co...

Embodiment 3

[0047] ①Preparation of organosilicon coupling agent hydrolyzate: under nitrogen protection, 6 parts of 3-(methacryloyloxy)propyldimethylethoxysilane, 6 parts of 3-(methacryloyloxy)propyl Dimethylmethoxysilane and 1.9 parts of deionized water were mixed in a four-necked flask, hydrolyzed for 1.4 h at 10°C and stirred at 350 r / min, and the low molecular weight compounds ethanol and methanol were removed under -0.09MPa vacuum. Mix with water for 1.4 hours, and let it stand to obtain an organosilicon coupling agent hydrolyzate with a viscosity of 200 mPa·s (25° C.).

[0048] ②In the four-necked flask, first add 60 parts of dipropylene glycol methyl ether, and after the temperature is raised to 145 ℃, under stirring at 350 r / min, dropwise add 40 parts of methyl methacrylate, 35 parts of styrene, and 20 parts of butyl acrylate, A mixed solution consisting of 2 parts of acrylic acid, 3.6 parts of di-tert-butyl peroxide, 3 parts of octadecyl mercaptan and 12 parts of the hydrolyzate o...

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Abstract

The invention provides a water-based acrylic resin for construction machinery paint and a preparation method thereof. The preparation method includes: adding 6.8-10.2 parts of epoxy resin, 0.03-0.05 parts of catalyst and 100 parts of the organosilicon / acrylic composite resin obtained in step 2 into the reaction vessel, and after heating to 140-150° C., at 250 Under stirring at ‑350r / min, react for 3‑4h, and filter to obtain the final product water-based acrylic resin for construction machinery paint. The resin prepared by the invention can be directly added with water (including other additives) and mixed to form a water-based acrylic paint. The paint is used without adding a curing agent, and is an environment-friendly one-component paint. Compared with the coating film prepared by the prior art, the coating film obtained by the resin has better water resistance (no rust reversion), water solubility and higher gloss, and is suitable for preparing construction machinery paint for outdoor use.

Description

technical field [0001] The invention belongs to the field of synthetic resins, and particularly relates to a water-based acrylic resin for construction machinery paint and a preparation method thereof. Background technique [0002] With the progress of society and the continuous improvement of human cognition level, people gradually realize that the volatile organic compound (VOC) emission of traditional solvent-based coatings has a great destructive effect on the ecological environment of the earth, and human health is also greatly affected. threaten. Therefore, using traditional organic solvents as diluents, construction machinery coatings containing various organic compounds such as benzene are gradually replaced by environmentally friendly water-based construction machinery coatings. Acrylic resin has the advantages of high light, thermal and chemical stability, high transparency, bright and plump, excellent color retention, good film formation, abundant sources and rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02C08F220/14C08F212/08C08F220/18C08F220/06C08F230/08C09D187/00
CPCC08G81/024C08F220/14C09D187/005
Inventor 吴蓁杨乐民王荣余金妹张英强
Owner SHANGHAI RESIN FACTORY