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Composite latex of organic silicon resin and acrylic ester polymers, and preparation method thereof

A technology of acrylate and composite latex, which is applied in the field of composite latex of silicone resin and acrylate polymer and its preparation. Complicated reaction steps and other problems, to achieve the effect of mild conditions, simple operation and simple method

Inactive Publication Date: 2009-10-28
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the research on the modification of acrylates by organosiloxanes, organosiloxanes or epoxy silanes containing unsaturated double bonds are mostly used for direct copolymerization with acrylates. Preparation of organosiloxane resin by hydrolysis and condensation under acidic conditions, the reaction steps are complex, and the conditions are harsh, it is difficult to successfully produce the required organosiloxane resin
Due to the presence of water in the emulsion, the alkoxy groups of the organosiloxane will undergo hydrolysis and condensation during the emulsion polymerization reaction, which seriously affects the storage stability of the polymer emulsion

Method used

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  • Composite latex of organic silicon resin and acrylic ester polymers, and preparation method thereof
  • Composite latex of organic silicon resin and acrylic ester polymers, and preparation method thereof
  • Composite latex of organic silicon resin and acrylic ester polymers, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The organosiloxane uses methyltrimethoxysilane, and its component formula is shown in Table 1.

[0035]

[0036] (1) Preparation of silicone resin: in a three-necked flask with a condensing device and a stirring device, add methyltrimethoxysilane, methyl methacrylate, butyl acrylate, acrylic acid and metered water (2.0 grams), React at a temperature of 20° C. for 30 hours to prepare a silicone resin acrylate solution.

[0037] (2) Pre-emulsification process: Sodium lauryl sulfate is dissolved in 5 grams of water, joins in the acrylate solution of methyltrimethoxysilane resin that step (1) makes, high-speed stirring (1000r / min) 1.0 hour to prepare a pre-emulsion. Sodium hydroxide was dissolved in 108 grams of water, and was slowly added dropwise to the pre-emulsion with a constant pressure funnel, and the drop was completed in 0.5 hours. During the dropping process, high-speed stirring was maintained to prepare the pre-emulsion.

[0038](3) Polymerization reaction:...

Embodiment 2

[0040] The organosiloxane adopts methyltrimethoxysilane, but the dosage is larger than [Example 1], and its composition is shown in Table 2.

[0041]

[0042] (1) Preparation of silicone resin: In a three-necked flask with a condensing device and a stirring device, add 3.0 grams of methyltrimethoxysilane, ethyl methacrylate, ethyl acrylate, methacrylic acid and 5% hydrochloric acid , and reacted at a temperature of 45°C for 10 hours to obtain a silicone resin acrylate solution.

[0043] (2) Pre-emulsification process: Dissolve OP-10 in 10 grams of water, add it to the acrylate solution of organosiloxane resin prepared in step (1), and stir at a high speed (1000r / min) at 50°C for 10 minutes to prepare Get a pre-emulsion. Sodium carbonate was dissolved in 102 grams of water, and was slowly added dropwise to the pre-emulsion with a constant pressure funnel, and the drop was completed in 0.5 hours. During the dropping process, high-speed stirring was maintained to prepare the ...

Embodiment 3

[0046] The organosiloxane is a mixture of methyltrimethoxysilane and dimethyldiethoxysilane. Its group distribution is shown in Table 3.

[0047]

[0048]

[0049] (1) Preparation of silicone resin: In a three-necked flask with a condensing device and a stirring device, add methyltrimethoxysilane, dimethyldiethoxysilane, propyl methacrylate, methyl acrylate, acrylic acid Butyl ester, acrylic acid and metered water (3.0 g) were reacted at a temperature of 45° C. for 10 hours to prepare a silicone resin acrylate solution.

[0050] (2) Pre-emulsification process: Dissolve OP-10 and sodium dodecylbenzene sulfonate in 12 grams of water, add to the acrylate solution of organosiloxane resin prepared in step (1), and heat at a high speed at 50°C Stir (1000r / min) for 30 minutes to prepare a pre-emulsion. Sodium hydroxide was dissolved in 97 grams of water, and slowly added dropwise to the pre-emulsion with a constant pressure funnel, and the dripping was completed in 0.5 hours....

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Abstract

The invention discloses a composite latex of silicone resin and acrylic polymer and a preparation method thereof. The preparation method of the present invention is prepared by hydrolyzing and condensing organosiloxane with quantitative water at a certain temperature under the catalysis of an acid, and using acrylic monomer as a solvent to dissolve and disperse the organosilicon resin, Then, the composite latex is obtained through pre-emulsification and polymerization reaction of an emulsifier. The method of the invention is simple, the conditions are moderate, the synthesis is easy, and the obtained product has good stability and excellent performance.

Description

technical field [0001] The invention relates to a composite latex of silicone resin and acrylic polymer and a preparation method thereof. Background technique [0002] Silicone is a class of chemical materials with many varieties and excellent performance. Since the Si-O bond has a very high bond energy (452kJ / mol), which is far greater than the C-C bond energy (345kJ / mol) and C-O bond energy (351kJ / mol), and the bond rotation is easy, in addition to having extremely low surface energy , so that it has many unique properties, such as: water resistance, high and low temperature resistance, weather resistance, air permeability, low surface energy and other properties. However, the molecular chains of silicone polymers are very flexible, and the intermolecular force is small, so the mechanical strength is very low, and the adhesion to other objects is very poor. Acrylic esters are widely used due to their excellent weather resistance, oxygen resistance, oil resistance, adhesi...

Claims

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Application Information

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IPC IPC(8): C08F283/12C08F2/22C08F4/30
Inventor 黎白钰张慎靖刘再满何乃普
Owner LANZHOU JIAOTONG UNIV
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