High-toughness melamine resin and preparing method thereof

Abstract

The invention discloses a high-toughness melamine resin and a preparing method thereof. An elastomer is adopted to be added in melamine resin with the form of powder and emulsion, the impact strength of melamine resin is improved, and high-toughness melamine resin is prepared. The preparing method of melamine resin comprises the steps of placing 40-85 parts of melamine-formaldehyde resin prepolymer, 5-50 parts of fiber, 0.1-0.5 part of curing agent, 5-30 parts of elastomer and 0.1-1 part of flowable agent into a kneading machine at 25-80 DEG C to be subjected to kneading for 30-90 min, afterwards placing kneaded materials into a stove at 70-130 DEG C to be subjected to stoving and dehydration, and then conducting ball milling on the kneaded materials and 3-10 parts of inorganic filler in a ball mill for 4-20 h to obtain high-roughness melamine powder. The other preparing method comprises the steps of placing prepolymer, the fiber, the curing agent and the elastomer into the kneading machine to be subjected to kneading, afterwards putting the kneaded materials into the stove to be subjected to stoving and dehydration to obtain irregular blocky solid, and then conducting ball milling on the blocky solid, inorganic filler and elastomer powder in the ball mill according to matching to obtain the high-roughness melamine powder. The preparation of the high-roughness melamine material is beneficial to reducing the breakage rate of a melamine product in use, and prolonging the service life of the melamine product.

Description

[0001] (1) Technical field [0002] The invention relates to a high-toughness melamine resin and a preparation method thereof. [0003] (2) Background technology [0004] Melamine resin is a new type of thermosetting plastic, which has the advantages of non-toxic, tasteless, bump resistance, corrosion resistance, high temperature resistance and low temperature resistance. The molecular structure is tight, the processing performance is good, the size is stable, the appearance of the product is smooth, the hardness is strong, and the durability is strong. It is widely used in daily necessities, machinery, electronics and other industries. However, due to the presence of substances such as its polymer cross-linking structure and fillers, it is relatively brittle. Melamine products, especially melamine tableware, although the drop resistance is better than traditional ceramic products, there is still a large breakage rate during use, which reduces the service life of the product a...

AI Technical Summary

Problems solved by technology

However, due to the complex process and harsh conditions of the polymerization method, it is difficult to control the amount of "soft segment" inserted, and the improvement effect on the toughness of melamine products is limited.

In addition to plant fiber can be added to food tableware, glass fiber and carbon fiber both have human safety issues, so it is difficult to widely use in melamine tableware

A large amount of plant fibers have been added to existing melamine products, and it is difficult to achieve toughening of melamine products by further increasing the amount of plant fibers added

[0006] The toughening of thermoplastics generally adopts the toughening method of elastomers for toughening and modification, but for thermosetting materials such as melamine resins, it cannot be melt-processed, and general thermoplastic elastomers are not suitable for melamine resins.