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Stable organosilicon modified copolymer emulsion and its preparation method

A copolymer and silicone technology, which is applied in the field of silicone modified copolymer emulsion and its preparation, can solve the problems of limited coating film performance, short emulsion storage period, and abnormal reaction.

Inactive Publication Date: 2002-06-19
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the conditions of emulsion polymerization, siloxane is easily hydrolyzed into active silanols in water, and condensation reactions will occur between silanols. Glue, so that the reaction can not be carried out normally, and the storage period of the resulting emulsion is short
In addition, practice has proved that the siloxane monomer content in the emulsion polymer is less than 10% (based on polymer mass) to improve the performance of the coating film is very limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Note:

[0017] 1. parts and % in Table 1 are parts by weight and percentage by weight;

[0018] ② DP-324 in Table 1 is a self-made MS-1 zwitterionic emulsifier;

[0019] 3. the initiator ammonium persulfate in table 1 can also be replaced by other commonly used water-soluble free radical initiators, such as potassium persulfate or hydrogen peroxide etc.;

[0020] 4. the protective colloid PM in table 1 is polycarboxylates;

[0021] 5. the percentage in brackets in table 1 refers to the weight percentage that this reactant occupies in the polymer emulsion.

Embodiment 2～3

[0023] According to the prescription given in Table 1, prepare with the method for Example 1.

[0024] Its technical index of embodiment 1~3 gained copolymer emulsion of the present invention is as follows:

[0025] Appearance: Slightly transparent, blu-ray opalescent liquid

[0026] Viscosity: 60~500CPS(25±1℃)

[0027] PH value: 5~8

[0028] Particle size: 0.1~0.2μm

[0029] Minimum film forming temperature: 20~30℃

[0030] Storage period (normal temperature) > 6 months

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Abstract

The present invention relates to a stable organosilicon modified copolymer emulsion and its preparation method. Said copolymer emulsion is made up by uisng monomer containing olefine and siloxane and vinyl monomer containing no siloxane through the emulsion copolymerization initiated by free radical in the presence of hydrolysis inhibitor, protective colloid and pH buffer. In the copolymer, the ratio of siloxane monomer can be up to 35%, and its polymerization process also can be normally implemented, and the obtained emulsion is stable, so that the obtained coating film is superior to that of similar copolymer emulsion with low siloxane content in water-proof property, resistance to contamination, adhesive force and weatherability. It is applicable to preparation of latex paints for cement base material, mosaic and tile, also can be used for preparing lacquer and coating paint, etc.

Description

technical field [0001] The invention relates to a stable organosilicon modified copolymer emulsion and a preparation method thereof. Background technique [0002] At present, although the architectural coatings prepared with styrene acrylate and acrylate copolymer emulsions have good weather resistance, color retention and water resistance, it is still difficult to meet the requirements of high-rise buildings and some requirements for a long service life of the coating film. requirements of the building. Due to the high bond energy of the silicon-oxygen bond, the UV resistance, oxidative degradation resistance and chemical resistance are good, and the surface energy of the silicone resin is low, and the coating has good hydrophobicity, water resistance and stain resistance. Therefore, the incorporation of organosiloxanes into general-purpose emulsion polymers can improve the polymer's UV radiation resistance, oxidation resistance, water resistance and stain resistance, and ...

Claims

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Application Information

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IPC IPC(8): C08F230/08
Inventor 孔志元张保利王燕朱柯南璇
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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