Epoxy-terminated silicon oil modified carboxyl-terminated hyperbranched polyester, and preparation method and application thereof

A technology of hyperbranched polyester and epoxy-terminated silicone oil, applied in polyester coatings, coatings, etc., can solve the problems of cracking, poor flexibility of carboxyl-terminated hyperbranched polyester, etc., achieve high heat resistance, improve heat resistance , the effect of good flexibility

Active Publication Date: 2013-05-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicone-modified carboxyl-terminated hyperbranched polyester prepared above has poor flexib

Method used

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  • Epoxy-terminated silicon oil modified carboxyl-terminated hyperbranched polyester, and preparation method and application thereof
  • Epoxy-terminated silicon oil modified carboxyl-terminated hyperbranched polyester, and preparation method and application thereof
  • Epoxy-terminated silicon oil modified carboxyl-terminated hyperbranched polyester, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

[0041] 1) Preparation of epoxy-terminated silicone oil

[0042] After adding 200g of octamethylcyclotetrasiloxane, 0.02g of tetramethylammonium hydroxide and 4g of concentrated sulfuric acid to the reactor equipped with condenser, thermometer, dropping funnel and stirrer according to the ratio, the reaction was protected by nitrogen for 7h The temperature was raised to 180°C, and the low-boiling substances were removed under reduced pressure to obtain the terminal hydrogen silicone oil; the prepared terminal hydrogen silicone oil, 2 g of allyl glycidyl ether, 200 g of toluene and 0.02 g of chloroplatinic acid were added to the reactor; The reaction was performed at 70°C under nitrogen protection for 8 hours, and the solvent was distilled off under reduced pressure to obtain epoxy-terminated silicone oil. The weight average molecular weight of the epoxy-terminated silicone oil was detected by gel permeation chromatography, and the result was 1015; the result was ...

Example Embodiment

[0055] Example 2:

[0056] 1) Preparation of epoxy-terminated silicone oil

[0057] After adding 200g of octamethylcyclotetrasiloxane, 0.02g of tetramethylammonium hydroxide and 4g of concentrated sulfuric acid to the reactor equipped with condenser, thermometer, dropping funnel and stirrer, the reaction was protected by nitrogen for 7h; At 190°C, the low-boiling substances were removed under reduced pressure to obtain the hydrogen-terminated silicone oil; the obtained hydrogen-terminated silicone oil, 2g of allyl glycidyl ether, 200g of toluene and 0.02g of chloroplatinic acid were added to the reactor; The reaction was protected for 8.0 h, and the solvent was distilled off under reduced pressure to obtain epoxy-terminated silicone oil.

[0058] The weight average molecular weight of epoxy-terminated silicone oil was detected by gel permeation chromatography, and the result was 1015; the epoxy value content of epoxy-terminated silicone oil was determined by the hydrochloric acid-ac...

Example Embodiment

[0070] Example 3:

[0071] 1) Preparation of epoxy silicone oil

[0072] After adding 200g of octamethylcyclotetrasiloxane, 0.06g of tetramethylammonium hydroxide and 10g of concentrated sulfuric acid into a reactor equipped with a condenser, a thermometer, a dropping funnel and a stirrer, the reaction was protected by nitrogen for 8h; At 185°C, distill under reduced pressure to remove low boilers to obtain hydrogen-terminated silicone oil; add the obtained hydrogen-terminated silicone oil, 18 g of allyl glycidyl ether, 350 g of toluene and 0.07 g of chloroplatinic acid into the reactor; increase the temperature to 80° C., The reaction was protected for 9 hours, and the solvent was distilled off under reduced pressure to obtain epoxy-terminated silicone oil.

[0073] The weight average molecular weight of the epoxy-terminated silicone oil was measured by gel permeation chromatography, and the result was 492; the epoxy value content of the epoxy-terminated silicone oil was determined...

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Abstract

The invention discloses epoxy-terminated silicon oil modified carboxyl-terminated hyperbranched polyester, and a preparation method and application thereof. The method comprises the following steps: evenly mixing dibasic alcohol and tribasic acid, then heating to 70-90 DEG C, and adding epoxy-terminated silicon oil and dimethylbenzene; heating at 180-210 DEG C for 1-3 hours, heating up to 220-240 DEG C, and heating for 1-3 hours; cooling to 90 DEG C, and adding organic solvent, an organic silicon low polymer and a crosslinking catalyst; heating to 110-120 DEG C, and heating for 2-3 hours; and cooling to 90 DEG C. The resin prepared through the method can be used for the preparation of high-temperature-resistant low-surface-energy paint. According to the method, the epoxy-terminated silicon oil is added in the carboxyl-terminated hyperbranched polyester synthesis process, so that the heat resistance and flexibility of the polyester are enhanced; and the organic silicon low polymer and the polyester are subjected to crosslinking reaction, so that the heat resistance of the polyester is enhanced. The resin prepared through the method can be used for the preparation of high-temperature-resistant paint.

Description

technical field [0001] The invention relates to a hyperbranched polyester resin, in particular to a carboxyl-terminated hyperbranched polyester modified with epoxy-terminated silicone oil and its preparation method and application, belonging to the field of organic polymer compounds. Background technique [0002] Polyester resin has excellent metal adhesion, good physical and mechanical properties such as high hardness and good chemical corrosion resistance, and is widely used in the coating industry. However, polyester resin has the disadvantages of poor heat resistance, low water resistance and poor weather resistance, which limit its application in high temperature resistant coatings. In order to improve the high temperature resistance of polyester resin, other resins are often used to chemically modify it. Silicone resin is an organic-inorganic hybrid material with excellent heat resistance, weather resistance, water resistance and low surface tension. Using silicone r...

Claims

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Application Information

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IPC IPC(8): C08G63/695C08G77/14C09D167/00
Inventor 瞿金清汤柳燕刘瑞源
Owner SOUTH CHINA UNIV OF TECH
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