In-situ polymerization PI modified nylon composite material
An in-situ polymerization and modified nylon technology, which is applied in the field of in-situ polymerization PI-modified nylon composite materials, can solve the problems of PI-modified PA's water absorption and mechanical properties are not good enough, and achieve the effect of effectively blocking moisture
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Embodiment 1
[0027] Using rigid segments such as polyimide to modify nylon resin and prepare composite materials can improve its mechanical properties and take into account toughness and water resistance. The specific steps are as follows:
[0028]The first step: prepare polyimide (PI) prepolymer, the molar ratio of 1~1.6:1 can be 1:1, 1.2:1 or 1.6:1 will have the dianhydride / diamine of ether bond group The solid is dissolved in a polar solvent and stirred at room temperature, and reacted with nitrogen for 5 hours to obtain a polyamic acid polymer, and then add toluene or xylene solvent at 160°C to 180°C, which can be 160°C, 168°C or 180°C for reflux cyclization 3h, get the acid anhydride-terminated polyimide macromolecules, remove the water in the system, add isocyanate, the reaction temperature is controlled at 80°C to 90°C, it can be 80°C, 83°C or 90°C for 1h to 1.5h It is 1h, 1.3h or 1.5h, and then the temperature is raised to 120°C ~ 130°C, it can be 120°C, 126°C or 130°C for 3h ~ 5h,...
Embodiment 2
[0032] The steps are the same as in Example 1, wherein the molecular weight of the PI modifier is selected to be 4000, the weight percentage of the PI modifier to the monomer is 15%, 10%, and 5% respectively, and the viscosity of the system after being incorporated into the monomer is respectively 0.2Pa.s , 0.6Pa.s, 1Pa.s, the impregnated fiber is good. The NaOH content accounts for 0.1% and 0.2% of the monomer respectively. The main antioxidant (1098) was 0.1%, 0.25%, 0.5%, and the auxiliary antioxidant (168) was 0.1%, 0.25%, 0.5%, respectively. Wherein the dianhydrides with ether bond groups described in the first step are respectively bisphenol A ether dianhydrides, or select 3,3',4,4'-tetracarboxylic acid diphenyl ether dianhydrides. The diamines are 2,2-bis[4-(4-aminophenoxy)phenyl]propane or 3,3'-diaminodiphenyl ether and 3,4'-diaminodiphenyl ether respectively. The polar solvent in the first step can be N-methylpyrrolidone, dimethylformamide or dimethylacetamide. Usi...
Embodiment 3
[0034] The steps are the same as in Example 1, wherein the molecular weight of the PI modifier is selected to be 8000 or 13000 respectively, and the PI modifier accounts for 15%, 10%, and 5% by weight of the monomer respectively, and the viscosities of the systems after being respectively incorporated into the monomer are respectively 0.2Pa.s, 0.6Pa.s, 1Pa.s, impregnated fiber is good. The NaOH content accounts for 0.1% and 0.2% of the monomer respectively. The main antioxidant (1098) was 0.1%, 0.25%, 0.5%, and the auxiliary antioxidant (168) was 0.1%, 0.25%, 0.5%, respectively. Wherein the dianhydrides with ether bond groups described in the first step are respectively bisphenol A ether dianhydrides, or select 3,3',4,4'-tetracarboxylic acid diphenyl ether dianhydrides. The diamines are 2,2-bis[4-(4-aminophenoxy)phenyl]propane or 3,3'-diaminodiphenyl ether and 3,4'-diaminodiphenyl ether respectively. The polar solvent in the first step can be N-methylpyrrolidone, dimethylfor...
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