Radiation resistant medical vinylene chloride plastics free from phthalate

[0034] Example 1, a radiation-resistant phthalate-free medical polyvinyl chloride plastic described in this example is prepared by blending the following components by weight:

[0035] 100 parts of polyvinyl chloride resin;

[0036] 60 parts of environmentally friendly plasticizers;

[0037] 4.5 parts of gamma ray absorber;

[0038] 7 parts of high-efficiency heat stabilizer;

[0039] 1 part lubricant;

[0040] The polyvinyl chloride resin is a polyvinyl chloride resin prepared by a suspension method, and its degree of polymerization is 1000-1300. The environment-friendly plasticizer is diisononyl cyclohexane 1,2-dicarboxylate. The γ-ray absorber is 2-nitro-2'-hydroxy-5'-methylazobenzene. The high-efficiency heat stabilizer is a liquid calcium-zinc heat stabilizer. Described lubricant is n-butyl stearate.

[0041] The preparation method of this example is: put the above-mentioned components in parts by weight into a high-speed reactor for polymerization reaction, the react

[0042] Example 2, a radiation-resistant medical polyvinyl chloride plastic without phthalates described in this example, prepared by blending the following components by weight:

[0043] 100 parts of polyvinyl chloride resin;

[0044] Environmental protection plasticizer 25 parts;

[0045] 3 parts gamma ray absorber;

[0046] 9 parts of high-efficiency heat stabilizer;

[0047] 1.5 parts of lubricant;

[0048] The polyvinyl chloride resin is a polyvinyl chloride resin prepared by a suspension method, and its degree of polymerization is 1000-1300. Described environment-friendly plasticizer is SOFT-N-SAFE, SOFT-N-SAFE is a new type of acetylated monoglyceride derived from hydrogenated castor oil, which is produced by Danisco (China) Co., Ltd. The γ-ray absorber is 2,4,6-tris(2,4-dihydroxyphenyl)-1,3,5-triazine. The high-efficiency heat stabilizer is a paste calcium zinc heat stabilizer. The lubricant is oxidized polyethylene wax.

[0049]The preparation method of this ex

[0050] Example 3, a radiation-resistant medical polyvinyl chloride plastic without phthalates described in this example, prepared by blending the following components by weight:

[0051] 100 parts of polyvinyl chloride resin;

[0052] 95 parts of environmentally friendly plasticizers;

[0053] 6 parts of gamma ray absorber;

[0054] 4.5 parts of high-efficiency heat stabilizer;

[0055] Lubricant 0.3 parts;

[0056] The polyvinyl chloride resin is a polyvinyl chloride resin prepared by a suspension method, and its degree of polymerization is 1000-1300. Described environment-friendly plasticizer is tri-n-butyl citrate (also can be EBN, and EBN is produced by Korean LG company). The γ-ray absorber is 2,4 dihydroxybenzophenone or 2(2-dihydroxy-5-benzyl)benzotriazole. The high-efficiency heat stabilizer is a powder calcium zinc heat stabilizer. Described lubricant is n-butyl stearate and oxidized polyethylene wax.

[0057] The preparation method of this example is: put the abo