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A kind of preparation method of in-situ polymerization modified unsaturated polyester resin

An in-situ polymerization and polyester resin technology, which is applied in the fields of oil chemistry and thermosetting resin modification, can solve the problems of strength reduction, insufficient thermal stability, and limited application range, etc., and achieve improved toughness, ductility, and flexibility sexual effect

Active Publication Date: 2020-07-28
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the high cross-linking density and a large number of rigid benzene ring structures of general-purpose unsaturated polyester resins, the sliding range between molecular chains is small, resulting in insufficient toughness, strength and thermal stability, etc.
General-purpose unsaturated polyester resin is hard and brittle after curing, low toughness and strength, and insufficient thermal stability, which greatly limits its application range; general-purpose unsaturated polyester resin uses styrene as a common crosslinking agent, and the content reaches 40%. However, it is toxic and highly volatile; by using dimer acid to modify unsaturated polyester, its toughness is well improved, but its strength is reduced

Method used

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  • A kind of preparation method of in-situ polymerization modified unsaturated polyester resin
  • A kind of preparation method of in-situ polymerization modified unsaturated polyester resin

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Experimental program
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Effect test

Embodiment 1

[0026] The invention provides a kind of preparation method of in-situ polymerization modified unsaturated polyresin, comprises the following steps:

[0027] 1) Take hydroxyl-modified carbon nanotubes, maleic anhydride, dimer acid, phthalic anhydride, p-toluenesulfonic acid, and 1,2-propanediol in a 500ml four-necked flask, feed nitrogen and slowly Start stirring when the temperature rises until the reactant is in a molten state, react at a temperature below 170°C, then vacuumize the reaction, wait for the temperature to rise to 170°C, start timing reaction, add a polymerization inhibitor to obtain an unsaturated polyester;

[0028] 2) After the polyester obtained in step 1) is cooled to 120°C, add a cross-linking agent in turn, the molar ratio of the cross-linking agent to maleic anhydride is 3.5:1, and the cross-linking agent is styrene with a molar ratio of 1:1 and acrylic acid, placed in a water bath to cool, then add accelerator cobalt naphthenate and initiator methyl ethy...

Embodiment 2

[0035] The present embodiment provides a kind of preparation method of in-situ polymerization modified unsaturated polyresin, comprises the following steps:

[0036] 1) Take hydroxyl-modified carbon nanotubes, maleic anhydride, dimer acid, phthalic anhydride, p-toluenesulfonic acid, and 1,2-propanediol in a 500ml four-necked flask, feed nitrogen and slowly Start stirring when the temperature rises until the reactant is in a molten state, react at a temperature below 170°C, then vacuumize the reaction, wait for the temperature to rise to 170°C, start timing reaction, add a polymerization inhibitor to obtain an unsaturated polyester;

[0037] 2) After the polyester obtained in step 1) is cooled to 120°C, add a cross-linking agent in turn, the molar ratio of the cross-linking agent to maleic anhydride is 3.5:1, and the cross-linking agent is styrene with a molar ratio of 1:1 and acrylic acid, placed in a water bath to cool, then add accelerator cobalt naphthenate and initiator me...

Embodiment 3

[0044] The present embodiment provides a kind of preparation method of in-situ polymerization modified unsaturated polyresin, comprises the following steps:

[0045] 1) Take hydroxyl-modified carbon nanotubes, maleic anhydride, dimer acid, phthalic anhydride, p-toluenesulfonic acid, and 1,2-propanediol in a 500ml four-necked flask, feed nitrogen and slowly Start stirring when the temperature rises until the reactant is in a molten state, react at a temperature below 170°C, then vacuumize the reaction, wait for the temperature to rise to 170°C, start timing reaction, add a polymerization inhibitor to obtain an unsaturated polyester;

[0046] 2) After the polyester obtained in step 1) is cooled to 120°C, add a cross-linking agent in turn, the molar ratio of the cross-linking agent to maleic anhydride is 3.5:1, and the cross-linking agent is styrene with a molar ratio of 1:1 and acrylic acid, placed in a water bath to cool, then add accelerator cobalt naphthenate and initiator me...

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Abstract

The invention discloses a method for preparing in-situ polymerization modified unsaturated polyester resin. The method comprises the following steps: 1) adding hydroxyl modified carbon nanotubes, maleic anhydride, dimeric acid, phthalic anhydride, a catalyst and 1,2-propanediol into a 500ml four-mouthed flask, introducing nitrogen gas into the four-mouthed flask, slowly heating the four-mouthed flask, starting to carry out stirring when reactants are in a molten state, carrying out a reaction for 0.5h at a temperature 170 DEG C or below, then, carrying out a vacuumized reaction, starting to carry out a clock reaction for 4h when the temperature rises to 170 DEG C, and adding a polymerization inhibitor, so as to obtain unsaturated polyester; 2) sequentially adding a cross-linker when the polyester obtained in the step 1) is cooled to 120 DEG C, carrying out cooling in water bath, then, adding an accelerant and an initiator, carrying out light stirring for 4min, pouring the mixture intoa liquid paraffin covered sample mold, carrying out standing for 24h at room temperature, and then, carrying out constant-temperature curing for 4h in a baking oven at the temperature of 80 DEG C, thereby obtaining a MWCNTs / DFA / UPR hybridized material.

Description

technical field [0001] The invention relates to the technical fields of oil chemistry and thermosetting resin modification, in particular to a preparation method of in-situ polymerization modified unsaturated polyester resin. Background technique [0002] Unsaturated resin (Unsaturated polyester resin, UPR) refers to the condensation of unsaturated dibasic acid, saturated dibasic acid (anhydride) and dibasic alcohol (polyol), and then copolymerized and cured with a vinyl crosslinking agent. Network-structured thermosetting resin. Because of its low price, readily available raw materials, simple production process, good manufacturability and mechanical properties, it has been widely used in many industrial fields or departments. However, because unsaturated polyester resin has a high crosslinking density and contains a large number of rigid benzene ring structures, the sliding range between molecular chains is small, resulting in insufficient toughness, strength and thermal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/01C08F212/08C08F220/06C08G63/52C08K9/00C08K7/24
CPCC08F283/01C08G63/52C08K7/24C08K9/00C08K2201/011C08F212/08C08F220/06
Inventor 冯光炷严旭明黄雪
Owner ZHONGKAI UNIV OF AGRI & ENG
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