Preparation method of flame-retardant resin

Abstract

The invention relates to a preparation method a flame-retardant resin. The preparation method adopts crosslinking chemical reaction, and comprises the following steps: (1) at normal temperature, weighing all the raw materials according to parts by weight for later use; (2) at normal temperature, dissolving maleic anhydride, tetrachloro phthalic anhydride, neopentyl glycol, a curing agent chlorinated styrene and methyl methacrylate, and uniformly mixing by sufficient stirring; (3) curing: curing the uniformly mixed solution obtained in the step (2) to obtain an unsaturated polyester resin, wherein the initial curing temperature is 20-30 DEG C, the initial curing time is 10-30 hours, the postcuring temperature is 25-35 DEG C, and the postcuring time is 4-6 hours; and (4) at normal temperature, mixing and dissolving fibers, copper naphthenate, cobalt isooctoate, calcium carbonate and silicon dioxide in the unsaturated polyester resin prepared in the step (3), uniformly mixing by sufficient stirring, and aging at 25 DEG C for at least 36 hours to obtain the flame-retardant resin.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to the field of a flame-retardant resin. Background technique [0002] With the continuous development of corrosion and protection and the improvement of industrialization, the application fields of composite materials are becoming wider and wider. The working conditions and media are becoming more and more complex, and the operating temperature is getting higher and higher. The market requirements for its performance are also increasing. Higher and higher. However, since phosphorus-based (phosphate ester, etc.) flame-retardant PC resins and flame-retardant PC / ABS alloys have a large amount (several % to more than 10% by weight) of phosphorus-based flame retardants added, there are some problems : Gas evolution may occur during mold injection molding, and when recycled or placed under accelerated degradation conditions (for high temperature and humidity), the ph...

AI Technical Summary

Problems solved by technology

However, since phosphorus-based (phosphate ester, etc.) flame-retardant PC resins and flame-retardant PC / ABS alloys have a large amount (several % to more than 10% by weight) of phosphorus-based flame retardants added, there are some problems : Gas evolution may occur during mold injection molding, and when recycled or placed under accelerated degradation conditions (for high temperature and humidity), the physical properties of the resin decrease significantly; these problems can be attributed to phosphorus-based resistive Combustion agent hydrolyzes PC components, especially under high temperature and high humidity conditions

[0003] At present, the high-performance resin composite materials used in the domestic and foreign fields are relatively single, mainly unsaturated polyester, vinyl ester resin, and tough epoxy resin materials, but these materials have deficiencies to varying degrees; Ester, high brittleness, low use temperature, and low bonding strength; although vinyl ester resin has the advantages of good toughness, good bonding strength, and low toxicity after curing, it has disadvantages such as low use temperature; epoxy resin, although it has toughness Good, high bonding strength, etc., but there are poor weather resistance, easy pulverization, high viscosity, poor wettability, and poor ability to withstand strong corrosive media such as strong acids, alkalis and solvents at higher temperatures. Curing system Disadvantages such as high toxicity, long curing cycle, and high post-processing costs

Therefore, traditional composite materials are far from meeting the market's increasingly high performance requirements.