Acroleic acid modified polysiloxane resin and coating thereof

A technology of polysiloxane resin and acrylic resin, which is applied in the direction of coating, etc., can solve the problems of slow curing speed of coating film, slow surface drying speed of coating film, low grafting reaction rate, etc., and achieve fast curing speed and accelerated reaction Effect of speed, high crosslink density

Active Publication Date: 2009-01-21
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low grafting reaction rate, when curing, the amino group of the curing agent only catalyzes the polycondensation reaction of siloxane, and there is no further crosslinking of the organic resin. Therefore, the curing speed of the coating film is relatively slow, and the weather resistance is slightly poor at the same time; One is to modify the siloxane prepolymer with acrylate monomers containing double bonds. The coating prepared from it contains a large number of small molecular compounds, has a small initial viscosity, and is completely cured by chemical crosslinking. Therefore, the coating film is dry The speed is very slow, it is easy to stick to the dust in the air, which affects the appearance, and the weather resistance is slightly poor

Method used

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  • Acroleic acid modified polysiloxane resin and coating thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 prepares the acrylic resin with glycidyl

[0024] (1) Monomer raw materials and dosage

[0025] Glycidyl acrylate 40Kg;

[0026] Other ethylenic monomers

[0027] n-butyl acrylate (Tg=-54°C) 30Kg;

[0028] 2-ethylhexyl acrylate (Tg=-85°C) 40Kg;

[0029] Methyl methacrylate (Tg=+105°C) 10Kg;

[0030] In the total weight of monomers, glycidyl acrylate accounts for 33.3%;

[0031] Other ethylenic monomers are composed of 87.5% (weight) of other ethylenic monomers with a glass transition temperature Tg of -100°C to -20°C and other ethylenic monomers with a glass transition temperature Tg of -20°C to +110°C Body 12.5% ​​(weight) composition.

[0032] (2) Specific operation

[0033] Add 40Kg of solvent xylene and 40Kg of butanol into a 300L reaction kettle, stir and raise the temperature to 110±2°C, start to drop 40Kg of glycidyl acrylate, 30Kg of n-butyl acrylate, 40Kg of 2-ethylhexyl acrylate, methacrylic acid The mixed solution of 10Kg of methyl ester ...

Embodiment 2

[0034] Embodiment 2 prepares the acrylic resin with glycidyl

[0035] (1) Monomer raw materials and dosage

[0036] Glycidyl methacrylate 24Kg;

[0037] Other ethylenic monomers

[0038] n-butyl acrylate (Tg=-54°C) 40Kg;

[0039] 2-ethylhexyl acrylate (Tg=-85°C) 30Kg;

[0040] Styrene (Tg=+100°C) 26Kg;

[0041] In the total weight of monomers, glycidyl methacrylate accounts for 20%;

[0042] Other olefinic monomers are composed of 72.9% (weight) of other olefinic monomers with a glass transition temperature Tg of -100°C to -20°C and other olefinic monomers with a glass transition temperature Tg of -20°C to +110°C Body 27.1% (weight) composition.

[0043] (2) Specific operation

[0044] The acrylic resin with glycidyl group was obtained by the same method as in Example 1, and its solid content was 60% (by weight).

Embodiment 3

[0045] Embodiment 3 prepares acrylic acid modified polysiloxane resin A

[0046] (1) Resin and dosage

[0047] Have the acrylic resin of glycidyl, solid content 60% (embodiment 1 system) 40Kg;

[0048] Siloxane prepolymer (brand 3074, Dow Corning product) 76Kg;

[0049] Note: The reactive group of siloxane prepolymer 3074 is methoxy group, the methoxy group content is 15-18% (weight) of the total solid weight of siloxane prepolymer, and the number average molecular weight is 1000-1500.

[0050] (2) Specific operation

[0051] Add the above-mentioned siloxane prepolymer and the acrylic resin (made in Example 1) with a glycidyl group in the container, and stir evenly to obtain the acrylic modified polysiloxane resin A of the present invention. In terms of solids, In the acrylic-modified polysiloxane resin A, the weight ratio of the glycidyl-containing acrylic resin to the silicone prepolymer was 24:76.

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Abstract

The invention relates to an acrylic modified polysiloxane resin and paint thereof. The acrylic modified polysiloxane resin is a compound resin of an acrylic resin with glycidyl and siloxane prepolymer with the number average molecular weight between 400 and 3,000. On the basis of counting solids, in the compound resin, the weight ratio of the acrylic resin with glycidyl and the siloxane prepolymer is between 10 and 40 to between 60 and 90. The paint containing the acrylic modified polysiloxane resin has a component A and a component B, wherein the weight ratio of the dosages of acrylic modified polysiloxane resin, pigment, filler, solvent and additives of the component A is 100:10-60:5-40:5-20:1-2; the component B is amino alkoxy silane as a curing agent; and when the coating is in use, the component A and the component B are well mixed in the weight ratio of 10 to between 0.8 and 1.5. Compared with the prior acrylic modified polysiloxane coating, the coating is fast in drying rate and excellent in weatherability.

Description

technical field [0001] The invention relates to an acrylic modified polysiloxane resin and its coating. Background technique [0002] With the development of the national economy and the improvement of people's living standards, people put forward higher requirements for the corrosion protection of large-scale steel structure projects, that is, to improve the long-term protection cycle, but also to be safe, healthy and meet the latest requirements of environmental protection. Polysiloxane resin coatings have the advantages of high construction solids, a small amount of solvent dilution to achieve construction viscosity, low irritation to the human body, and excellent weather resistance. In recent years, polysiloxane resin coatings are being used as replacement products for polyurethane resin coatings. However, pure polysiloxane resins have poor adhesion on organic coatings and the coating film is brittle, so modified polysiloxane resins are often used. For example, polysilo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/06C08L33/08C09D183/06C09D133/08C08F220/10C08F220/32
Inventor 潘煜怡李敏刘宝成潘玉红方健君王秀娟顾斌陈月珍沈海鹰马胜军
Owner CHINA NAT OFFSHORE OIL CORP
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