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Method for modifying unsaturated polyester resin by in-situ polymerization of reactive nano-SiO2

A polyester resin, in-situ polymerization technology, applied in the field of materials, can solve the problems of application limitations, the impact performance cannot meet the requirements, etc., and achieve the effects of convenient operation, excellent mechanical properties, and simple process

Inactive Publication Date: 2012-08-01
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when used in some specific occasions, the impact performance cannot meet the requirements, and the application is limited. In order to expand the application range of unsaturated polyester resins, especially to meet the requirements of some special fields, it is necessary to carry out research on unsaturated polyester resins. modified

Method used

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  • Method for modifying unsaturated polyester resin by in-situ polymerization of reactive nano-SiO2
  • Method for modifying unsaturated polyester resin by in-situ polymerization of reactive nano-SiO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 3.0g of nano-silica RNS-E, 83.0g of maleic anhydride, 125.4g of phthalic anhydride and 141.8g of propylene glycol into the polymerization reactor. React at 160°C for 2h and at 200°C for 3h. Measure the acid value of the reaction system, when it is less than 80mgKOH / g, vacuumize for 1.2h, and the vacuum degree is 0.085Mpa. When the acid value of the reaction system drops to 40-50mgKOH / g, stop vacuuming, cool down to 180°C, add 0.075g of polymerization inhibitor hydroquinone and 0.10g of paraffin, continue to cool down to 120°C and add 165g of styrene to obtain Modified unsaturated polyester resin composite material.

[0026] Operate under the same conditions without adding nano-silica to prepare an unsaturated polyester resin; the composite material obtained in the present invention and the unsaturated polyester resin material (comparative example 1) are made according to the GB / T2567-2008 standard The splines were tested, and the results are shown in Table 1:

...

Embodiment 2

[0030] Weigh 2.0 g of nano-silica RNS-A, dissolve it in 33.9 g of diethylene glycol, and oscillate ultrasonically to disperse it evenly.

[0031] Add 78.2g maleic anhydride, 118.1g phthalic anhydride, 109.2g propylene glycol and diethylene glycol dispersed with RNS-A into the polymer reactor, react at 160°C for 2h, and react at 200°C for 3h. When the acid value of the reaction system reaches 70-80mgKOH / g, vacuumize for 1.5h, and the vacuum degree is 0.09Mpa. When the acid value of the reaction system drops to 30-40mgKOH / g, stop vacuuming, cool down to 180°C and add 0.075g of inhibitor hydroquinone and 0.10g of paraffin. Continue to lower the temperature to 120° C. and add 175 g of styrene to obtain a modified unsaturated polyester resin composite material.

[0032] Operate under the same conditions without adding nano-silica to prepare an unsaturated polyester resin; the composite material obtained in the present invention and the unsaturated polyester resin material (compara...

Embodiment 3

[0036] Weigh 3g of nano-silica RNS-D, dissolve it in propylene glycol, and vibrate ultrasonically to make it completely dispersed.

[0037]115.6 g maleic anhydride, 87.3 g phthalic anhydride, and 148.0 g propylene glycol with RNS-D were charged to the polymer kettle. React at 160°C for 2h and at 200°C for 3h. Measure the acid value of the reaction system, and when it reaches 70-80mgKOH / g, vacuumize for 1.5h, and the vacuum degree is 0.085Mpa. When the acid value of the reaction system drops to 30-40mgKOH / g, stop vacuuming, cool down to 180°C and add 0.075g of inhibitor hydroquinone and 0.10g of paraffin. Continue to lower the temperature to 120° C. and add 165 g of styrene to obtain a modified unsaturated polyester resin composite material.

[0038] Operate under the same conditions without adding nano-silica to prepare an unsaturated polyester resin; the composite material obtained in the present invention and the unsaturated polyester resin material (comparative example 3)...

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Abstract

The invention belongs to the technical field of materials, and in particular relates to a method for modifying an unsaturated polyester resin by in-situ polymerization of reactive nano-SiO2. The method comprises the following steps of: reacting dihydric alcohol and dibasic acid into a polymerization reactor, when the acid value of a system is 10-50 mgKOH / g, ending the reaction, cooling and adding a polymerization inhibitor, paraffin wax and a cross-linking agent, wherein the reactive nano-SiO2 is in-situ surface modified nano-silica and added in different periods of the polymerization reaction. The method, provided by the invention, has the advantages of simple process, convenience for operation, safety, stability and easy control and is suitable for large-scale industrial producton; and the reactive nano-SiO2 is uniformly dispersed in an unsaturated polyester resin system, and a reactive nano-SiO2 / unsaturated polyester resin composite material obtained after modification has better mechanical properties, thermal property and the like than the pure unsaturated polyester resin.

Description

technical field [0001] The invention belongs to the field of material technology, in particular to a reactive nano-SiO 2 A method for in-situ polymerization modified unsaturated polyester resin. Background technique [0002] Unsaturated polyester is produced by polycondensation reaction of saturated dibasic acid, unsaturated dibasic acid and diol, and then dissolved in unsaturated monomer, because unsaturated polyester contains non-aromatic unsaturated Bonds, the cross-linking reaction can be initiated by an appropriate initiator to generate an unsaturated polyester resin with a network structure. Unsaturated polyester resin has good mechanical properties and dimensional stability under heat and stress, and it has excellent electrical properties, chemical corrosion resistance, and simple processing technology. It is widely used in chemical industry, machinery, electrical appliances, transportation and construction. and other related industries. However, when used in some ...

Claims

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Application Information

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IPC IPC(8): C08F283/01C08G63/52C08G63/676C08K9/10C08K3/36
Inventor 张治军李小红李瑞瑞王树銮
Owner HENAN UNIVERSITY