3、Polyamide resin preparation method
Polyamide resins are usually produced by polycondensation of dibasic acids and dibasic amines, but there are many other preparation methods.
(1)Acetic acid method
The method begins with, phthalic anhydride, m-phenylenediamine and acetic acid are mixed in a certain proportion, and a catalyst is added. Under mild conditions, the mixture is slowly heated to about 100°C and reacted for about 4 hours. At the end of the reaction, the polymer was washed by adding it to deionized water and the polyamide was obtained by vacuum drying. The polyamide prepared by the acetic acid method has the advantages of higher molecular weight, high crystallinity and good temperature resistance, but the reaction requires the addition of a catalyst, which is more costly.
(2) Nitrogen peroxide method
Nitrogen peroxide method is a method to get polyamide by reacting o-phenylenediamine and phthalic acid in nitrogen peroxide solution. Dissolve o-phenylenediamine, phthalic acid and nitrogen peroxide by oscillation. The polyamide is left at room temperature for 24 hours to form a liquid polyamide. The polyamide is gelatinized by heating and excess water is removed to finally obtain a solid polyamide. The polyamide prepared by nitrogen peroxide method does not require the addition of catalyst and has a lower cost, but the reaction process requires heating for curing, which affects the selectivity and molecular weight distribution of the reaction.
(3) Resorcinol method
Resorcinol method is a method to get polyamide by slow reaction of catechol and catecholamine in aqueous ammonium polyphosphate solution. Catechol, catechol, ammonium polyphosphate and deionized water are mixed in a specified ratio. The mixture was slowly heated to 80°C and reacted for 8-10 hours. At the end of the reaction, the polymer was obtained by steps such as centrifugation and vacuum drying. The polyamides prepared by the resorcinol method have the advantages of narrow molecular weight distribution, high melting point, and high crystallinity, but the reaction needs to be carried out under strict reaction conditions and the cost is high.

Polyamide resin material has become the most widely used class of the five major engineering plastics with its excellent comprehensive performance and rich variety. In recent years, it has been widely used in many fields such as synthetic materials, electronics, and automobiles. With the rapid development of the new energy automobile industry in recent years, triggered by the "plastic instead of steel" automobile lightweight development trend, polyamide resin materials as a representative of engineering plastics, will have a broader development prospects. From the mechanical properties, water resistance, temperature resistance, abrasion resistance, chemical reagent resistance, ease of processing and other aspects of polyamide resin materials continue to optimize the performance of polyamide resin materials, so as to promote the development of polyamide resin material products to the direction of high performance, high quality, is of great practical significance.
In addition, China's government support for the new materials industry continues to increase, providing a good policy environment for the development of polyamide resin industry. With the growing demand of domestic and foreign markets, China's polyamide resin industry will usher in new development opportunities. In this case, it is of great significance for the development of China's new material industry to strengthen the research and development and innovation of polyamide resin, and to improve product quality and technology level.


Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150A. 
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.