Preparation method of integrally formed road barrier
A technology for isolation fences and roads, which is applied to household components, applications, household appliances, etc., can solve problems that have not been discovered, and achieve the effects of improving the probability of secondary damage, excellent water resistance, and driving safety
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[0032] (1) The preparation steps of starch ester are as follows:
[0033]Step 1: Add methanol into the reactor as a reaction medium, add molecular sieves, and then slowly add starch, so that the starch is evenly dispersed in methanol, and maintain the temperature in the reactor at 50°C;
[0034] Step 2: add methyl ricinoleate into the above reaction kettle so that m (starch): m (methyl ricinoleate) = 1:1.2, and react at 50°C for 6 hours;
[0035] Step 3: After the reaction is completed, the reactant is precipitated with 95% ethanol and centrifuged to obtain a starch ester with a degree of substitution of 0.5-0.7 and an average molecular weight of 50,000-60,000KD.
[0036] (2) The preparation steps of chitosan ester are as follows:
[0037] Step 1: Add formamide into the reaction kettle as the reaction medium, add molecular sieves, and then add chitosan, so that chitosan is evenly dispersed in the formamide, and maintain the temperature in the reaction kettle at 60°C;
[0038...
Embodiment 1
[0046] Add the starch ester, chitosan ester, and hyaluronic acid ester prepared above into the high-speed mixer according to the weight ratio of 1:1:1, heat the materials in the high-speed mixer to 110°C, and rotate at 400 rpm Run and mix for 30 minutes; adjust the temperature of the mixed material in the mixer to 140°C, adjust the speed to 750 rpm, mix for 30 minutes, stop mixing, take out the mixed material, and cool it; send the cooled mixed material into the kneader , start the operation and heat the mixture to 90°C, knead the mixture for 30 minutes, take out the material after kneading, send it into the twin-screw extruder, melt and granulate at 140°C, and then make a biodegradable thermoplastic material.
Embodiment 2
[0048] The ratio of starch ester: chitosan ester: hyaluronic acid ester is 2:2:1; the mixing temperature is 150°C; the rest are the same as in Example 1.
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