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Polyimide Powder Synthesis Method

Oct 12, 2015

Many different types of polyimide, the market has been the market at least 50 or more, the most important difference is the use of synthetic materials, or use a block of hybrid and other technology, in order to obtain the desired type.
Polyimide synthesis basically using solution polycondensation method using a two-step synthesis, the first synthetic polyamide acid into polyimide imide again. While one step to save raw materials and time, but the overall performance of products will be reduced, rarely used.
Currently on the market polyimide resin powder synthesis method The main difference in the imidization process, divided into two categories: chemical imidization, thermal imidization.
PI100-2 (ether anhydride type) is typical chemical imidization method, the first synthetic polyamide acid, plus terminating agent, catalysts, precipitation and the like. Products directly out of that powder, then dry.
PI00-1 (heterocyclic type) is hot imide into powder, the first synthetic polyamide acid, plus the amount of catalyst, precipitating agents or heat dehydration. Out of the coarse powder, after drying, pulverization can.
The main reason polyimide powder molded appear after some red floc point is:
1. iminated incomplete reasons, some not imidized polyamic acid, is wrapped inside, produce imidization, crosslinking time at high temperatures and other phenomena;
2. Some of the PI coarse powder, which wrapped some of the solvent, the solvent becomes a gas at high temperatures, the lysing effect on PI generated (this is the main reason most experts believe).
When pure material processing products, these two factors on the mechanical properties of the product is not great, but to have an impact on a large number of composite materials, dispersing effect is the biggest factor. So after screening, such as 100 mesh or more, which can get rid of these two factors.Many different types of polyimide, the market has been the market at least 50 or more, the most important difference is the use of synthetic materials, or use a block of hybrid and other technology, in order to obtain the desired type.
Polyimide synthesis basically using solution polycondensation method using a two-step synthesis, the first synthetic polyamide acid into polyimide imide again. While one step to save raw materials and time, but the overall performance of products will be reduced, rarely used.
Currently on the market polyimide resin powder synthesis method The main difference in the imidization process, divided into two categories: chemical imidization, thermal imidization.
PI100-2 (ether anhydride type) is typical chemical imidization method, the first synthetic polyamide acid, plus terminating agent, catalysts, precipitation and the like. Products directly out of that powder, then dry.
PI00-1 (heterocyclic type) is hot imide into powder, the first synthetic polyamide acid, plus the amount of catalyst, precipitating agents or heat dehydration. Out of the coarse powder, after drying, pulverization can.
The main reason polyimide powder molded appear after some red floc point is:
1. iminated incomplete reasons, some not imidized polyamic acid, is wrapped inside, produce imidization, crosslinking time at high temperatures and other phenomena;
2. Some of the PI coarse powder, which wrapped some of the solvent, the solvent becomes a gas at high temperatures, the lysing effect on PI generated (this is the main reason most experts believe).
When pure material processing products, these two factors on the mechanical properties of the product is not great, but to have an impact on a large number of composite materials, dispersing effect is the biggest factor. So after screening, such as 100 mesh or more, which can get rid of these two factors.