Hot press molded melamine foam prepared by hot press molding and preparation method thereof

Abstract

The present invention discloses a hot press molded melamine foam, and the melamine foam comprises, by weight, 100 parts of melamine resin, 1-10 parts of a surfactant, 5-40 parts of a foaming agent, 0-20 parts of an assistant, 5-20 parts of a catalyst, 0-30 parts of water, and 5-30 parts of hot pressing rubber powder particles. The invention also discloses a preparation method for the hot press molded melamine foam, and the method includes following steps: preparation of the melamine resin; preparation of a semi-finished product of the melamine foam: mixing raw materials uniformly to form a foaming solution, and subjecting the foaming solution to microwave action to obtain the semi-finished product; and preparation of a melamine foam finished product: spraying a liquid formed by dispersion of the hot pressing rubber powder particles during the moving of the semi-finished product of the melamine foam, and press-forming the dried foam by a thermo-compressor to obtain the melamine foam finished product. Reticular layer structures of the melamine foam are adhered together through melting of the hot pressing rubber powder particles in the method, and the melamine foam has good mechanical properties and flame retardance, and does not increase the formaldehyde content. The method is capable of continuous production.

Description

technical field [0001] The invention relates to a melamine foam, in particular to a heat-pressed melamine foam and a preparation method thereof. Background technique [0002] Melamine foam is a new type of foam plastic with a three-dimensional grid structure with an opening rate of more than 99%. It has excellent sound absorption, flame retardancy, heat insulation, heat resistance stability, hygiene and safety, and abrasion resistance. Compared with traditional plastics such as polyurethane foam and polystyrene foam, it has excellent flame retardancy without adding flame retardants, so that it can play a huge role in the following fields: construction industry, chemical industry, manufacturing industry , transportation, production and construction, equipment, HVAC systems, electronic products, security, daily cleaning items, environmental protection, aerospace, military, agriculture, etc., have huge application potential and broad market prospects. [0003] After continuous...

AI Technical Summary

Problems solved by technology

[0005] In the modern automobile manufacturing industry, reducing the volume of materials is a major trend. Under this trend, the large volume caused by the high opening of melamine foam will cause obstacles to the use in specific use environments.

At the same time, for melamine foam itself, direct use without post-processing does not meet certain specific conditions of use.

[0006] At the same time, some properties of ordinary melamine foam cannot meet the requirements of use in specific environments. For example, when it is used directly as an engine cover material, although it has good heat insulation performance, melamine foam cannot withstand machine operation for a long time. High temperature, it is necessary to improve performance through specific methods or improve performance through compounding with other materials before it can be used

[0007] The current post-processing technology of melamine foam is mainly direct cutting and molding or compounding with other materials or hot-pressing foam to improve performance, but there are some problems in traditional hot-pressing foam. In order to meet the requirements of hot-pressing, resin synthesis is carried out The formula will be adjusted when the resin is foamed, and a certain amount of hot-pressing additives will be added to assist when foaming, but the added additives will affect the foaming system, and the mechanical properties of the foam foamed by this resin will be significantly improved. At the same time, the content of free formaldehyde will also increase a lot. The increase of formaldehyde content is harmful to health and cannot meet the requirements.

Adding additives to increase hot-pressing performance during foaming will destroy the original foaming system. Although the foam can be subjected to hot-pressing process, other properties such as mechanical properties or high-temperature resistance will be significantly reduced.