Medicinal low-temperature-resistant toughening anti-gamma ray impact-resistant transparent polypropylene material and preparation method thereof

Abstract

The invention discloses a medicinal low-temperature-resistant toughening anti-gamma ray impact-resistant transparent polypropylene material and a preparation method thereof. The medicinal low-temperature-resistant toughening anti-gamma ray impact-resistant transparent polypropylene material is prepared by completely mixing a base material, a flexibilizer, a gamma shielding auxiliary agent, a transparent nucleating agent, an antioxidant, a lubricant, a brightening agent and a molecular weight regulator according to the proportion, wherein homopolymerized polypropylene serves as the base material. An ethylene-octylene-propylene ternary random copolymer is adopted, so the medicinal low-temperature-resistant toughening anti-gamma ray impact-resistant transparent polypropylene material has excellent toughness and impact resistance and low-temperature resistance, is transparent, and fundamentally solves the problem that a medicinal polypropylene material is not transparent. A reactive type hindered amine stabilizing agent is grafted on a polypropylene molecular chain by a reaction extrusion method, so the gamma ray resistance is improved. After the medicinal polypropylene material prepared by the method is subjected to 25-kilojoule gamma irradiation, the yellowing index is less than 1; and then a moulding part is placed in a 70-DEG C baking oven for 8 weeks, the yellowing index is 3, the comprehensive mechanical property is reduced by 5 percent, and the transparency maintains over 90 percent.

Description

technical field [0001] The invention relates to the field of polypropylene materials, in particular to a medical low-temperature-resistant toughened gamma-ray-resistant impact-resistant transparent polypropylene material and a preparation method thereof. Background technique [0002] As a large class of general-purpose materials, polypropylene is widely used for its small specific gravity, easy processing, corrosion resistance, non-toxicity and excellent comprehensive performance. At present, medical equipment such as syringes and droppers used in China are mainly made of polypropylene materials. Due to the material, there are the following problems: (1) Polypropylene has poor low temperature resistance, so some medical equipment produced in the cold winter There is serious damage during transportation; (2) Polypropylene materials are sterilized with ethylene oxide propylene. On the one hand, ethylene oxide propylene will be emitted in the air during use, affecting the envir...

AI Technical Summary

Problems solved by technology

At present, medical equipment such as syringes and droppers used in China are mainly made of polypropylene materials. Due to the material, there are the following problems: (1) Polypropylene has poor low temperature resistance, so some medical equipment produced in the cold winter There is serious damage during transportation; (2) Polypropylene materials are sterilized with ethylene oxide propylene. On the one hand, ethylene oxide propylene will be emitted in the air during use, affecting the environment; In terms of equipment, studies have shown that ethylene oxide is not only acutely toxic, but also mutagenic and carcinogenic. It is also reported that long-term low-concentration exposure to ethylene oxide can impair human recognition ability

Ethylene oxide itself is a toxic gas, exposure to excessive propylene oxide can cause burns and irritation, hemolysis, bad cells, etc., resulting in harm to the human body

Most of the foreign countries use gamma rays to sterilize, which can achieve absolutely no residue, but the materials used in China will cause molecular chain breaks when gamma rays are used, and cannot resist gamma rays, let alone resist low temperatures at the same time. The loss exceeds 40%; (3) Due to the special use of some medical products, such as medical syringes, there are high requirements for the transparency and toughness of polypropylene materials. At present, the transparency of materials is generally increased by adding nucleating agents. The turbidity of a sheet with a thickness of 1.3mm can reach below 15%, but the addition of a nucleating agent usually affects the toughness of the material. Therefore, the notched impact strength of polypropylene resin generally used to prepare medical injections is about 20J / M. The finished syringe is easy to break, and increasing the transparency of the material by adding a nucleating agent cannot play a fundamental role, so it is a key issue to greatly improve the transparency of the material under the premise of ensuring good toughness

To this end, research and development of a low-temperature-resistant, toughened, gamma-ray-resistant, and impact-resistant transparent polypropylene material enables the localization of medical materials that can be sterilized by gamma. It solves the technical problem that people have been eager to solve but has never been successful, and it is also a major progress and breakthrough in medical polypropylene materials

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