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Organic siloxane modified phenylethylene-acrylic ester nano-emulsion and preparing method thereof

The technology of organosiloxane and nano-emulsion is applied in the field of organosiloxane-modified styrene-acrylate nano-emulsion and its preparation, which can solve the problem of affecting the storage stability of polymer emulsion, small amount of organosiloxane added, Difficulty in the selection of comonomers, etc., to achieve the effects of thermodynamic stability, increased weather resistance, and improved mechanical properties

Inactive Publication Date: 2003-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, due to the presence of water in the emulsion polymerization, the alkoxy groups in the organosiloxane will undergo hydrolysis and condensation reactions, which will seriously affect the storage stability of the polymer emulsion; due to the molecular structure and There is a huge gap in polarity, and there will be different degrees of phase separation due to compatibility problems, so it is difficult to choose comonomers
The organosiloxane modified styrene-acrylate emulsion synthesized by conventional emulsion polymerization has poor stability, and the amount of organosiloxane added is small, so it is not easy to copolymerize with other monomers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The monomer composition is styrene, butyl acrylate, methyl methacrylate, methacrylic acid, hydroxyethyl methacrylate, and vinyl alkoxysilane containing C5-C20. The composition formula is shown in Table 1.

[0047] Table 1

[0048] Composition Mass percent, %1 Styrene 252 Methacrylic acid (MAA) 23 Butyl acrylate (BA) 164 Hydroxyethyl methacrylate 25 Vinyl organosiloxane 16 Emulsifier 2.57 Potassium persulfate (K 2 S 2 o 8 ) 0.28 Sodium Bicarbonate 0.19 Dodecyl Mercaptan 0.510 Propylene Glycol 0.211 Secondary Deionized Water 5012 Ammonia (28%) 0.5

[0049] Add 1 part of emulsifier, 18 parts of water, 1 part of methacrylic acid, 3 parts of butyl acrylate, and 8 parts of styrene into the reactor, stir for 20 minutes, heat the temperature of the reactor to 80C, add the initiator dropwise, and continue stirring After 15 minutes, a weak blue light appeared in the emulsion, and after 15 minutes, start to drop the pre-emulsified monomer (remaining monomer and 30 parts o...

Embodiment 2

[0051] The monomer composition is butyl acrylate, styrene, acrylic acid, hydroxypropyl methacrylate, and vinyl alkoxysilane containing C5-C20. The composition formula is shown in Table 2.

[0052] Table 2

[0053] Composition Mass percent, %1 Styrene (St) 252 Acrylic acid (AA) 13 Butyl acrylate (BA) 154 Hydroxypropyl methacrylate 25 Vinyl organosiloxane 36 Emulsifier 2.57 Potassium persulfate (K 2 S 2 o 8 ) 0.28 Sodium Bicarbonate 0.19 Dodecyl Mercaptan 110 Ethylene Glycol 0.211 Secondary Deionized Water 50

[0054] Add 1 part of emulsifier, 20 parts of water, 1 part of acrylic acid, 2 parts of butyl acrylate, and 8 parts of styrene into the reactor, stir for 20 minutes, heat the temperature of the reactor to 80°C, add the initiator dropwise, and continue stirring until A faint blue light appeared in the emulsion. After 15 minutes, start to drop the pre-emulsified monomer (remaining monomer and 30 parts of water to emulsify at high speed for 25 minutes) and initiator....

Embodiment 3

[0056] The monomer composition is styrene, isooctyl acrylate, methacrylic acid, hydroxyethyl methacrylate, vinyl alkoxysilane containing C5-C20, and its component formula is shown in Table 3

[0057] table 3

[0058] Composition Mass percent, %1 Styrene 242 Methacrylic acid (MAA) 13 Isooctyl acrylate 164 Hydroxyethyl methacrylate 15 Vinyl organosiloxane 3.56 Emulsifier 1.37 Potassium persulfate (K 2 S 2 o 8 ) 0.28 Sodium Bicarbonate 0.59 Mercaptoethanol 0.310 Propylene Glycol 0.211 Secondary Deionized Water 52

[0059] Add 1 part of emulsifier, 15 parts of water, 1 part of methacrylic acid, 1 part of isooctyl acrylate, 6 parts of styrene, and 1 part of hydroxyethyl methacrylate into the reactor, stir for 20 minutes, and heat the temperature of the reactor To 80°C, add the initiator dropwise, and continue stirring until the emulsion has a faint blue light. After 15 minutes, start to drop the pre-emulsified monomer (the remaining monomer and 35 parts of water are stirred ...

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Abstract

An organic siloxane modifier nano-class styrene-acrylate emulsion used for paint or adhesive is prepared from the functional silane monomer with multifunctional vinylalkoxy groups and the monmers of styrene, alkyl methylacrylate, hydroxyalkyl methylacrylate, alkyl acrylate and (methyl) acrylic acid through copolymerization in the manner that under the action of organic silaxane as hydrolysis inhibitor the emulsion polymerizing is inhibited. Its advantages are low content of emulsifier, high content of solid component and storage stability (more than one year), high resistance to weather, dirt, water, chemical solvent and alkali, and high adhesion and tension strength.

Description

technical field [0001] The invention relates to the technical field of coatings used for building exterior wall coatings, water-based wood coatings, waterproof coatings, metal alloy plate decoration coatings, and water-based adhesives, in particular to a high-performance organosiloxane modified styrene-acrylate nano Emulsion and method for its preparation. Background technique [0002] Styrene-acrylate emulsion has many outstanding advantages, such as excellent light resistance, weather resistance, acid and alkali resistance and corrosion resistance, and is widely used in coatings, adhesives, etc., but because styrene-acrylate emulsion has Disadvantages such as color retention, water resistance and poor adhesion. The main chain of organosiloxane is Si-O-Si bond, which has high flexibility, good high and low temperature resistance, low surface energy and excellent water resistance. [0003] Styrene-acrylic emulsion is modified by using multi-functional silicone functional m...

Claims

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Application Information

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IPC IPC(8): C08F2/24C08F2/38C08F20/10
Inventor 张心亚蓝仁华陈焕钦
Owner SOUTH CHINA UNIV OF TECH
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