Polyurethane prepolymer modified epoxy resin emulsion as well as preparation method and application thereof

A technology of polyurethane prepolymer and epoxy resin emulsion, which is applied in the direction of wear-resistant fibers, textiles and papermaking, fiber types, etc., can solve the problems of reducing the mechanical properties of carbon fibers, increase the degree of curing, increase the surface energy, and improve the fiber cluster effect

Pending Publication Date: 2022-04-19
山西钢科碳材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this sizing agent will reduce the mechanical properties of carbon fibers to a certain extent

Method used

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  • Polyurethane prepolymer modified epoxy resin emulsion as well as preparation method and application thereof
  • Polyurethane prepolymer modified epoxy resin emulsion as well as preparation method and application thereof
  • Polyurethane prepolymer modified epoxy resin emulsion as well as preparation method and application thereof

Examples

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preparation example Construction

[0050] In one aspect, embodiments of the present invention provides a method for preparing an urethane prepolymer modified epoxy resin emulsion, comprising the following steps:

[0051] Preparation of polyurethane prepolymer step: the metered polyether polyol at a temperature of 110-120 ° C for vacuum stirring dehydration treatment for 60-90min. The temperature is then reduced to 50-60 ° C, to which aliphatic polyisocyanates are added (the purpose of this cooling is to prevent the formation of bursting). Subsequently, the temperature is slowly raised to 90-95 ° C (here, the purpose of heating is to increase the reaction rate of polyols and polyisocyanates), in the nitrogen protection reflux reaction for 2-3h (here, nitrogen protection reflux is: to prevent the reaction of water vapor and isocyanate, affecting the actual reaction effect), to obtain polyurethane prepolymer reaction product (the main component is polyurethane prepolymer).

[0052] Chain expansion, crosslinking steps:...

Embodiment 1-5

[0080] Examples 1-5 provide a polyurethane prepolymer modified epoxy resin emulsion preparation scheme, specifically each embodiment in accordance with the raw materials in Table 1 (raw material type and portion by weight), the following operation steps:

[0081] Preparation of polyurethane prepolymer step: the metered polyether polyol under a vacuum of 110 ° C, stirred dehydration 60-90min (wherein, Example 1, Example 2 are stirred dehydration for 60min; Example 3, Example 4 are stirred for dehydration for 75min; Example 5 stirred for dehydration for 90min). Then, after reducing the temperature to 50-60 ° C (wherein Examples 1-5 are reduced to 55 ° C), aliphatic polyisocyanates are added to it. Subsequently, the temperature was slowly raised to 90-95 ° C (wherein, Example 1-2 was warmed to 90 ° C, Example 3-4 was heated to 93 ° C, Example 5 was heated to 95 ° C), the reaction under the condition of nitrogen protection reflux was 2-3h, and the polyurethane prepolymer reaction prod...

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Abstract

The invention relates to a polyurethane prepolymer modified epoxy resin emulsion as well as a preparation method and application thereof. The preparation method comprises the following steps: enabling polyether polyol to react with aliphatic polyisocyanate, so as to obtain a polyurethane prepolymer reaction product; adding a chain extender, a cross-linking agent, an organic solvent and a catalyst into the polyurethane prepolymer reaction product for chain extension and cross-linking reaction to obtain a cross-linking reaction product; adding epoxy resin, a diluent, an antioxidant, an emulsifier and an organic solvent into the cross-linking reaction product, and carrying out graft modification on the epoxy resin by the polyurethane prepolymer with the cross-linking network structure to obtain a modified reaction product; and carrying out post-treatment on the modified reaction product to obtain the polyurethane prepolymer modified epoxy resin emulsion. The preparation method is used for preparing the polyurethane prepolymer modified epoxy resin emulsion, the polyurethane prepolymer modified epoxy resin emulsion can be used as a sizing agent for carbon fibers, and the wettability, the bundling property and the wear resistance of the carbon fibers can be effectively improved on the basis that the strength of the original carbon fibers is not reduced.

Description

Technical field [0001] The present invention relates to a carbon fiber surface modification technology field, in particular to a polyurethane prepolymer modified epoxy resin emulsion and preparation method and application thereof. Background [0002] Carbon fiber has a series of excellent properties such as high specific strength and high specific modulus and is widely used. However, due to the poor toughness and wear resistance of carbon fiber, in the process of carbon fiber winding or weaving, monofilament fracture often occurs through mechanical friction, which greatly reduces the strength of carbon fiber. In the production process of carbon fiber, the above problems can be solved well by sizing; sizing can enhance the performance of the interface between carbon fiber and resin; therefore. Sizing has become a crucial part of the fiber production process. However, with the continuous development of the carbon fiber composite material industry, the requirements for the performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/10C08G18/48C08G18/32D06M15/568D06M101/40
CPCC08G18/10C08G18/6674C08G18/4833C08G18/4825C08G18/3215D06M15/568D06M2101/40D06M2200/40D06M2200/35C08G18/3206
Inventor 黄超冯伟隆雷爱民李登华杨晗郝俊杰王思思杜晓敏
Owner 山西钢科碳材料有限公司
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