High adjacent position phenolic resin for toughness reinforcing of elastic body and method for producing the same

Abstract

The invention discloses high ortho position formaldehyde phenol resin with elastic toughened, wherein, the elastic body reaches nm-level decentralization in the formaldehyde phenol resin, the content of the elastic body is 3 to 10 percent, and the ortho-para-ratio of the resin is 2.5 to 5. The invention also provides a preparation method of the formaldehyde phenol resin. The invention is characterized in that the high ortho position formaldehyde phenol resin with elastic toughened is prepared by adopting the way of in situ polymerization. Compared with the prior art, the high ortho position formaldehyde phenol resin with elastic toughened of the invention has the advantages of good fluidity, rapid curing and shaping, excellent toughness, simple preparation method, easy practice, etc.

Description

technical field [0001] The invention relates to a resin and a preparation method thereof, in particular to an elastomer-toughened high-ortho-position phenolic resin and a preparation method thereof. Background technique [0002] At present, phenolic resin has the advantages of simple production process, low price, good heat resistance, electrical insulation performance, corrosion resistance, dimensional stability, etc., so it has a wide range of applications in many fields. However, because of the rigid structure containing more benzene rings in the molecular chain, the performance of unmodified phenolic resin is very brittle and poor in toughness, so that the impact strength of phenolic resin products is low and the service life is short, which greatly limits the performance of phenolic resins. The field of application of the resin. In the toughening modification of phenolic resin, a lot of research has been done at home and abroad, and there are mainly two methods: extern...

AI Technical Summary

Problems solved by technology

[0003] Rubber-toughened phenolic resin is the most common toughening system. At present, the general-purpose rubber-toughened phenolic resin belongs to physical blending modification. Mixing rubber and phenolic resin on a roll mill is not only labor-intensive, but also time-consuming. The dispersion performance of rubber also has certain limitations

Under high temperature conditions, traditional rubber and phenolic resin blends have poor impact resistance, short service life, and cannot be used stably for a long time

Another method of rubber toughening phenolic resin is to use a co-solvent to dissolve the rubber and phenolic resin first, and then evaporate the solvent. This method takes a long time and is relatively expensive.

Because the dissolution process of rubber is generally a slow process, which takes a long time, and the cost of the selected co-solvent and the process of removing the solvent will increase the production cost. No matter which method is used above, rubber toughened phenolic resin There is also a disadvantage, that is, the introduction of rubber with a large molecular weight into the phenolic resin curing system will hinder the curing of the phenolic resin, making the curing of the phenolic resin slower.