Special material for irradiation-resistant sterilizing polypropylene spun-bonded non-woven fabric and preparation method of special material

Abstract

The invention belongs to the technical field of synthetic resin production, and particularly relates to a special material for an irradiation-resistant sterilizing polypropylene spun-bonded non-woven fabric and a preparation method of the special material. The preparation method specifically comprises the following steps: (1) on-line mixing of basic polypropylene powder, peroxide and additives; (2) controllable rheological reaction in a barrel of an extruder; (3) extrusion pelletizing and centrifugal drying; and (4) air conveying, product homogenization, packaging and delivery. According to the invention, a one-time hot working process is utilized, direct contact with oxygen in the processes of mixing and preparation is avoided, reduction in mechanical performance and optical performance caused by the hot working process is reduced, additional addition of an elastomer for toughening is not needed, and production cost is low. The produced special material provided by the invention can provide protection for polymer degradation induced by high-energy rays, and is long in oxidation induction period and not prone to discoloring.

Description

technical field [0001] The invention belongs to the technical field of synthetic resin production, and in particular relates to a special material for radiation-resistant sterilization polypropylene spun-bonded non-woven fabric and a preparation method thereof. Background technique [0002] Medical protective products such as surgical gowns, surgical caps, protective clothing, hand washing clothes and other spun-bonded non-woven products are generally sterilized with ethylene oxide, and the sterilization cycle is long. The residual ethylene oxide in the products endangers the health of users ,polluted environment. Long-term ventilated storage or forced desorption is required to reduce the concentration of ethylene oxide. Compared with ethylene oxide sterilization, electron beam irradiation is a more efficient and hygienic sterilization method, while conventional polypropylene materials are obviously discolored when the absorbed dose reaches 10kGy under electron beam irradia...

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Problems solved by technology

CN202010237120.9 The raw material composition of the polypropylene resin composition contains 0.05-0.2 parts by mass of phenolic antioxidants and 0.05-0.2 parts by mass of thioester-based antioxidants. During the process, it is easy to produce peculiar smell, and it is mostly used for synthetic rubber. It also needs to meet the corresponding limit specified in GB 9685-2016 for the specific migration of plastic materials and products for food contact, which will affect the use of polypropylene medical materials and products; in addition, phenols Antioxidants are easily oxidized by peroxide free radicals generated during the irradiation process into quinones and methoquinones, which intensify the discoloration of materials after irradiation

[0005] These schemes that use the blend composition modification to produce radiation-resistant sterilization, directly contact with oxygen during the dosing, homogenization, and mixing of the mixed components, need to use polypropylene that has been thermally processed once Granules are prepared after secondary melting, which adds a thermal processing compared with the direct preparation process on industrial equipment, which leads to the decline of mechanical properties and optical properties caused by contact with oxygen and secondary thermal processing to the oxidative degradation of the product. Usually, it is necessary to add Elastomer toughening, high production cost, low production capacity, and high energy consumption

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