Phenolic foaming resin toughened with hydroxyl-terminated nitrile rubber

Abstract

The invention provides phenolic foaming resin toughened with hydroxyl-terminated nitrile rubber and relates to phenolic foaming resin. The phenolic foaming resin is prepared from components a follows: phenolic compounds, aldehyde compounds, a modifier and a catalyst. The phenolic foaming resin is prepared through steps as follows: (1), the fused phenolic compounds and the basic catalyst are mixed, put in a water bath kettle and heated to 60 DEG C; (2), the aldehyde compounds are added in batches, and the addition is controlled to be finished within half an hour; (3), heat is preserved for half an hour after the aldehyde compounds are added completely, and the aldehyde compounds are enabled to react completely; (4), the modifier is added, a mixture is put in a magnetic stirrer, stirred for 10 min, heated, subjected to a reaction at the constant temperature for an hour and a half and cooled, PH is regulated to be 7-8 with a PH regulator, dehydration and cooling are performed for 24 h, and the modified target phenolic resin can be obtained. The modified phenolic resin has good mechanical properties and overall performance.

Description

technical field [0001] The invention relates to a phenolic foaming resin, in particular to a phenolic foaming resin toughened by hydroxy-terminated nitrile rubber. Background technique [0002] Phenolic resin is formed by polycondensation of phenol formaldehyde or its derivatives. It has excellent properties such as high bonding strength, high carbon residue rate, low smoke and low toxicity, and various processing forms. It has become an indispensable raw material in contemporary industry. It has a wide range of applications in the fields of electronics, construction, printing, and aerospace. However, traditional phenolic resins still have shortcomings such as insufficient heat resistance, poor toughness, and easy absorption of water and moisture. [0003] Patent CN 200810060760 adopts the rubber toughening method to modify the phenolic resin, and also achieves the toughening effect to a certain extent. The specific technical route is to improve the toughness of the phenol...

AI Technical Summary

Problems solved by technology

However, since the rubber emulsion is a metastable system, homogeneous blending cannot be achieved in the phenolic resin aqueous solution, so the phenolic resin modified by this method has poor stability and is prone to phase separation during use.

In addition, due to the simple physical blending, when the adhesive is cured, the distribution of rubber is not uniform, resulting in poor toughening effect