| 摘要 |
According to the invention, the process for preparing a synthetic photodegradable product based on polypropylene and lignosulphonate consists in mixing on a plastograph 70 ...80 % isotactic polypropylene with 10 ...15 % epoxidated ammonium lignosulphonate, 10 ...15 % isotactic polypropylene grafted with glycidyl methacrylate, as compatibilizer, the weight ratio polypropylene : lignosulphonate being 1:1, in the presence of 1% diamino diphenyl methane as a cross-linking agent with respect to the amount of lignosulphonate and propylene at a temperature of 190 degree C for 7...10 minutes. The product is pressed as films at a pressure of 170 at, at a temperature of 190 degree C for 5 minutes and finally is cooled under pressure. The epoxidated ammonium lignosulphonate has a molecular mass of 18,000...40, 000, a dynamic viscosity of 85 ...100P at a temperature of 25 degree C and an epoxy equivalent ranging between 0.10 ...0.20 %.
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