Preparation method and applications of degradable polystyrene material
A technology of polystyrene and degrading masterbatch, applied in the direction of coating, can solve the problems of increasing safety risk and slow degradation rate, and achieve the effect of accelerating the degradation rate, reducing the harm and solving the problem of taking up a large space.
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[0019] Such as figure 1 As shown, the invention provides a kind of preparation method of degradable polystyrene material, comprises the following steps:
[0020] Step 1: Prepare polystyrene masterbatch using conventional technology; Step 2: Prepare degradable masterbatch: take a certain amount of photosensitizer, sunscreen agent and degradation control agent and mix at high speed, and then mix with some polystyrene prepared in step 1 Masterbatch mixing, twin-screw melt blending, and then cooling and pelletizing to obtain degradable masterbatches;
[0021] Wherein, the mass ratio of the total mass of the photosensitizer, sunscreen and degradation control agent to the polystyrene masterbatch in step 2 is 1-4:20. In the second step, the mass ratio of the photosensitizer to the sunscreen is 1-10:1, and the mass ratio of the sunscreen to the degradation control agent is 1-20:1.
[0022] The photosensitizer can be selected from one or more transition metal salts reported in CN1031...
Embodiment 1
[0032] Step 1: Prepare polystyrene masterbatch by conventional process.
[0033] Step 2: Preparation of degradable masterbatch: After mixing the raw materials in Example 1 in the above table evenly, melt blending by twin-screw, the main screw speed is 300rpm, and the temperatures in the six zones are 160, 210, 220, 220, 210, 210 ℃, head temperature 210 ℃, and then degradable masterbatch obtained after water cooling and pelletizing.
[0034]Step 3: Preparation of degradable polystyrene granular material: After mixing the 400g degradable masterbatch prepared in step 2 with the polystyrene plastic granules with primary form prepared in 1000g step 1, the mixture is passed through a twin-screw Melt blending, the speed of the main screw is 300rpm, the temperature of the six zones is 160, 210, 220, 220, 210, 210°C, the temperature of the head is 210°C, and then the degradable polystyrene particles are obtained after water cooling and pelletizing.
[0035] Preparation of degradable p...
Embodiment 2
[0039] After mixing the raw materials in Example 2 in the above table evenly, the degradable polystyrene masterbatch was prepared through the same steps as in Example 1. Mix 500g of the masterbatch in step 2 with 10kg of polystyrene plastic granules in primary form. Melting temperature is 210°C, mold temperature is 40°C, injection pressure is 500bar, and injected into a plastic spoon mold at high speed, molding and demolding to obtain degradable polystyrene Styrene spoon. The above spoon was coated with titanium dioxide in the same steps as in Example 1 to obtain a degradable polystyrene spoon that can be in contact with food.
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