A kind of preparation method of polyethylene foam board
A technology of polyethylene foam and preparation steps, which is applied in the field of preparation of polyethylene foam boards, can solve the problems that the mechanical properties cannot be further improved, and achieve the effects of improved mechanical properties, improved compatibility, and improved breaking strength
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example 1
[0021]Mix toluene-2,4-diisocyanate and N,N-dimethylformamide in a three-necked flask at a mass ratio of 1:40, and add four times the mass of toluene-2,4-diisocyanate to the three-necked flask. Methyl hydroxybenzoate and dibutyltin dilaurate with 0.04 times the mass of toluene-2,4-diisocyanate were fed into the three-necked flask with nitrogen gas at a rate of 20mL / min, and at a temperature of 85°C and a rotation speed of 400r / min After stirring and mixing for 4 hours under certain conditions, the modified isocyanate blank was obtained. After the modified isocyanate blank was concentrated at a temperature of 70°C, a rotation speed of 150r / min, and a pressure of 600kPa for 4 hours, the modified isocyanate was obtained; Amylopectin and sulfuric acid with a mass fraction of 37% were mixed at a mass ratio of 1:32, stirred and mixed for 6 hours at a temperature of 45°C and a rotational speed of 350r / min, centrifuged, and filtered to obtain a filter cake. Wash with deionized water un...
example 2
[0023] Mix amylopectin and sulfuric acid with a mass fraction of 37% at a mass ratio of 1:32, stir and mix for 6 hours at a temperature of 45°C and a rotational speed of 350r / min, then centrifuge and filter to obtain a filter cake. The filter cake was washed with deionized water until the washing liquid was neutral, and then dried at 80°C for 60 minutes to obtain modified starch; the modified starch and water were mixed in a beaker at a mass ratio of 2:7, and the After ultrasonic dispersion at a frequency of 55kHz for 30 minutes, the modified starch dispersion was obtained. The modified starch dispersion and mixed silicone oil were mixed in the flask at a mass ratio of 10:7, and the modified starch dispersion was added to the flask with a mass of 0.4 times of Glauber's salt, and stirred and mixed for 4 minutes under the condition of rotating speed of 10000r / min, the modified starch mixture was obtained, and the modified starch mixture was mixed with the isopropanol solution of ...
example 3
[0025] Mix toluene-2,4-diisocyanate and N,N-dimethylformamide in a three-necked flask at a mass ratio of 1:40, and add four times the mass of toluene-2,4-diisocyanate to the three-necked flask. Methyl hydroxybenzoate and dibutyltin dilaurate with 0.04 times the mass of toluene-2,4-diisocyanate were fed into the three-necked flask with nitrogen gas at a rate of 20mL / min, and at a temperature of 85°C and a rotation speed of 400r / min After stirring and mixing for 4 hours under certain conditions, the modified isocyanate blank was obtained. After the modified isocyanate blank was concentrated at a temperature of 70°C, a rotation speed of 150r / min, and a pressure of 600kPa for 4 hours, the modified isocyanate was obtained; Amylopectin and sulfuric acid with a mass fraction of 37% were mixed at a mass ratio of 1:32, stirred and mixed for 6 hours at a temperature of 45°C and a rotational speed of 350r / min, centrifuged, and filtered to obtain a filter cake. Wash with deionized water u...
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