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Preparation method of high-strength and high-toughness vinyl ester resin

A vinyl ester resin, high-strength technology, applied in the field of vinyl ester resin, can solve the problems of affecting stability, large curing shrinkage, easy gelation, etc., to achieve improved bonding performance and strength, reduced volume shrinkage, good impact strength

Active Publication Date: 2021-06-25
湖北海星瑞新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although vinyl ester resins have been widely promoted in traditional anticorrosion fields and engineering applications, ordinary vinyl ester resins still have some shortcomings: vinyl ester resins have a large curing shrinkage rate, and the cured product has more rigidity, but insufficient toughness, etc.
Tests have proved that the existing synthetic route has the following disadvantages: (1) The reaction temperature of polyurethane prepolymer and vinyl ester is generally 50-60°C, which is relatively safe. Due to the low reaction temperature, it is difficult to complete the reaction without adding a catalyst, but Adding the catalyst will affect the stability of the ester group on the vinyl ester resin, and the reaction time generally exceeds 3 hours; (2) Synthesize unmodified vinyl ester resin first, with multiple hydroxyl groups on its molecular chain (epoxy side hydroxyl group, epoxy ring-opened hydroxyl group), and then react with polyurethane prepolymer, and the regularity of the reaction product is poor; (3) The amount of polyurethane prepolymer added is limited, and it is easy to gel when adding 12%, and the shelf life of the product is relatively short. short
(4) When the same amount of polyurethane prepolymer is added, the viscosity of polyurethane prepolymer grafted modified vinyl ester resin is higher

Method used

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  • Preparation method of high-strength and high-toughness vinyl ester resin
  • Preparation method of high-strength and high-toughness vinyl ester resin

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Experimental program
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Effect test

Embodiment 1

[0031] The preparation method of described a kind of high-strength high-toughness vinyl ester resin comprises the following steps:

[0032] Step 1: Polyurethane prepolymer synthesis steps, including:

[0033] Add 300g of polyether diol PPG2000 into the reaction flask and stir it, protect it with nitrogen, raise the temperature of the reaction flask to 80°C, then add 54.6g of TDI into the constant pressure dropping funnel, drop it at a speed of 2d / s, TDI drops After the addition, react at a constant temperature of 90°C, use the method of national standard HG / T 2409-92 to measure the -NCO content to 3.88%, stop the reaction when it reaches the theoretical value, and obtain polyurethane prepolymer (PUR) for later use.

[0034] Step 2: Synthesis steps of polyurethane prepolymer modified epoxy resin, including:

[0035] Add 454.6g of the polyurethane prepolymer (PUR) into the reaction bottle and stir it, protect it with nitrogen, raise the temperature of the reaction bottle to 90°...

Embodiment 2

[0039] The preparation method of described a kind of high-strength high-toughness vinyl ester resin comprises the following steps:

[0040] Step 1: Polyurethane prepolymer synthesis steps, including:

[0041] Add 200g of polyether diol PPG1000 into the reaction flask and stir it, protect it with nitrogen, raise the temperature of the reaction flask to 75°C, then add 71g of HDI into the constant pressure dropping funnel, drop it at a speed of 2d / s, and add HDI dropwise After completion, the reaction was carried out at a constant temperature of 85°C. The content of -NCO was measured to be 6.88% by the method of national standard HG / T 2409-92. When the theoretical value was reached, the reaction was stopped to obtain polyurethane prepolymer (PUR) for later use.

[0042] Step 2: Synthesis steps of polyurethane prepolymer modified epoxy resin, including:

[0043] Add 271g of the polyurethane prepolymer (PUR) into the reaction bottle and stir it, protect it with nitrogen, raise the...

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Abstract

The invention relates to a preparation method of high-strength and high-toughness vinyl ester resin. The preparation method comprises the following steps: firstly, reacting diisocyanate with polyether glycol to prepare an isocyanate-terminated polyurethane prepolymer (PUR), then reacting the polyurethane prepolymer (PUR) with hydroxyl of epoxy resin to obtain polyurethane block modified epoxy resin (UE), and finally, reacting with unsaturated monocarboxylic acid to obtain the polyurethane modified vinyl ester resin (VER). According to the preparation method disclosed by the invention, not only is a flexible polyether chain segment blocked into a resin structure, but also the functionality of the vinyl ester resin is increased due to the existence of a carbamate bond. Therefore, the high-strength and high-toughness vinyl ester resin is low in shrinkage rate and high in strength after being cured, the impact resistance is obviously improved, the comprehensive performance is good, the product is stable, and the reaction route is reasonable.

Description

technical field [0001] The invention relates to a preparation method of high-strength and high-toughness vinyl ester resin, belonging to the field of vinyl ester resin. Background technique [0002] Vinyl resin, also known as epoxy acrylate resin, is prepared by ring-opening addition of epoxy resin and monounsaturated carboxylic acid, and then dissolved in unsaturated polymerizable monomer to obtain vinyl ester resin. Vinyl ester resin has outstanding corrosion resistance, mechanical properties, construction process performance, and cost performance, and has long become synonymous with "super anti-corrosion resin". [0003] Although vinyl ester resins have been widely promoted in traditional anticorrosion fields and engineering applications, ordinary vinyl ester resins still have some shortcomings: vinyl ester resins have a large curing shrinkage rate, and the cured product has more rigidity, but insufficient toughness. The occasions that require high impact resistance and ...

Claims

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Application Information

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IPC IPC(8): C08G18/83C08G18/10C08G18/48C08G18/58
CPCC08G18/831C08G18/10C08G18/4825C08G18/58
Inventor 邓金飞饶秋华崔子浩唐济科
Owner 湖北海星瑞新材料科技有限公司
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