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Epoxy-polyurea adhesive and preparing method thereof

An adhesive, polyurea technology, applied in the direction of adhesive, epoxy resin, adhesive type, etc., can solve the problems of low coating adhesion, difficult to meet engineering applications, lack of polar groups, etc.

Inactive Publication Date: 2011-06-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the gel time is too fast, the wetting of the substrate is not good, resulting in low adhesion of the coating, especially for metal substrates, the adhesion is generally around 8MPa, which is difficult to meet the requirements of engineering applications.
At present, the adhesion of polyurea coatings is mainly improved by painting primers, adding adhesion promoters, and performing mechanical properties on the substrate, but the improvement is not large. Some people use polyaspartic acid esters as curing agents. Prolonging the gel time of polyurea improves the overall performance of polyurea, but the adhesion has not been significantly improved due to the lack of polar groups that can form bonds with metal substrates in the polyurea system

Method used

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  • Epoxy-polyurea adhesive and preparing method thereof
  • Epoxy-polyurea adhesive and preparing method thereof
  • Epoxy-polyurea adhesive and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1. Preparation of adhesive:

[0021] Component A: E-44 epoxy resin; HDI (hexamethylene diisocyanate) trimer.

[0022] Component B: Aromatic amino-terminated polyether

[0023] Preparation: mix 100g HDI trimer (NCO value 0.55mol / 100g) and 67g E-44 (epoxy value 0.44mol / 100g) epoxy resin, add 0.35mol aromatic amino polyether to the mixture and continue to mix evenly The epoxy-polyurea adhesive is composed, and the surface-drying time of the adhesive at room temperature is 20 minutes.

[0024] After the epoxy-polyurea adhesive is cured at room temperature, it is tested according to the national standard and has the following mechanical properties:

[0025] Flexibility: 50kg·cm.

Embodiment 2

[0026] Embodiment 2. Preparation of adhesive:

[0027] Component A: E-44 epoxy resin; HDI (hexamethylene diisocyanate) trimer.

[0028] Component B: Aromatic amino-terminated polyether.

[0029] Preparation: mix 100g HDI trimer (NCO value 0.55mol / 100g) and 150g E-44 epoxy resin (epoxy value 0.44mol / 100g) evenly, add 0.44mol aromatic amino-terminated polyether to the mixture and continue to mix evenly The epoxy-polyurea adhesive is composed, and the surface-drying time of the adhesive at room temperature is 40 minutes.

[0030] After the epoxy-polyurea adhesive is cured at room temperature, it is tested according to the national standard and has the following mechanical properties:

[0031] Flexibility: 50kg·cm.

Embodiment 3

[0032] Embodiment 3. Preparation of adhesive:

[0033] Component A: E-44 epoxy resin; HDI (hexamethylene diisocyanate) trimer.

[0034] Component B: polyaspartate polyether.

[0035] Preparation: mix 100g HDI trimer (NCO value 0.55mol / 100g) and 67g E-44 (epoxy value 0.44mol / 100g) evenly, add 0.42mol polyaspartate polyether to the mixture and continue to mix evenly The epoxy-polyurea adhesive is composed, and the surface-drying time of the adhesive at room temperature is 40 minutes.

[0036] After the epoxy-polyurea adhesive is cured at room temperature, it is tested according to the national standard and has the following mechanical properties:

[0037] Flexibility: 50kg·cm.

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Abstract

The invention relates to epoxy-polyurea adhesive agent and the preparation process. The adhesive agent is prepared through evenly mixing A component and B component, wherein the A component is blend of isocyanate trimer and epoxy resin with weight proportioning of 1:0.25-1.5, the B component is steric hindrance type polyether polyamine, the blending ratio of the A component and the B component isdecided by the content of isocyanate trimer and epoxy resin in A component and the kind of amino in B component. The preparation process of adhesive agent comprises evenly mixing isocyanate trimer and epoxy resin according the 1:0.25-1.5 of weight proportioning as A component, and then justly adding steric hindrance type polyether polyamine of B component to evenly mix. The adhesive agent of the invention combines the advantages of polyurea adhesive agent and epoxy resin adhesive agent, and has the characteristics of high strength, high ductility, high packing ratio, environment property resistance, rapid surface drying and convenient construction and the like.

Description

technical field [0001] The invention relates to an adhesive, in particular to an epoxy-polyurea adhesive with a blend of isocyanate trimer and epoxy resin as component A and sterically hindered amino polyether as component B and a preparation method thereof. Background technique [0002] Polyurea adhesive is an environmentally friendly material that has been developed in recent years with fast curing and easy construction. It is more and more favored by people because of its high performance and good decoration. It gels in seconds and reaches walking strength in a few minutes, making it suitable for large area spraying jobs and therefore has good application properties. However, due to the fast gel time and poor wetting of the substrate, the adhesion of the coating is not high, especially the adhesion to metal substrates is generally around 8MPa, which is difficult to meet the requirements of engineering applications. At present, the adhesion of polyurea coatings is mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/02C09J163/00
Inventor 官建国马会茹刘培赵立英
Owner WUHAN UNIV OF TECH