Rubber syringe needle protective cap for pre-encapsulation injection syringe and production method thereof

Abstract

The invention discloses a rubber syringe needle protective cap for a pre-encapsulation injection syringe. The protective cap is prepared from the following raw materials in parts by weight: 100 parts of synthesized polyisoprene rubber, 5-30 parts of alkaline white carbon black, 20-70 parts of calcined kaolin, 0.3-1.2 parts of peroxide, 0.5-1.0 part of stearic acid, 5-20 parts of polytetrafluoroethylene micro powder, 5-20 parts of ultra-high molecular weight polyethylene micro powder, 1-5 parts of titanium dioxide and 1-3 parts of carbon black. The rubber syringe needle protective cap has the obvious characteristics that a clean and simple peroxide sulfuration system is adopted, and a conventional complicated sulfur and zinc oxide promotion system is avoided. Special alkaline fillers are adopted, the sulfuration degree and speed of rubber are improved, and a smell problem caused by adopting the peroxide to sulfurate the polyisoprene rubber is reduced. The polytetrafluoroethylene micro powder and the ultra-high molecular weight polyethylene micro powder with good inertness and dispersibility are added into a formula, the lubricity and chemical inertness of the rubber are improved, and the viscous resistance of a rubber syringe needle protective cap product is improved.

Description

technical field [0001] The invention belongs to the field of rubber fittings for prefilled syringes, in particular to a rubber needle protective cap for prefilled syringes and a production method thereof. Background technique [0002] Rubber needle caps for traditional prefilled syringes use traditional sulfur and zinc oxide accelerator systems of natural rubber or polyisoprene rubber. In order to improve the vulcanization speed, vulcanization degree and vulcanization efficiency, high content of sulfur is usually used Sulfenamide and thiuram accelerators, in the production process, the use of these materials can easily cause the phenomenon of "sulphur spraying" of rubber protective caps, and the UV absorbance, reducing substances and pH changes of the finished products can easily exceed the standard. Therefore, it is usually necessary to use a certain concentration of acid and alkali to perform high-pressure extraction treatment on the product. The production process is comp...

AI Technical Summary

Problems solved by technology

[0002] Rubber needle caps for traditional prefilled syringes use traditional sulfur and zinc oxide accelerator systems of natural rubber or polyisoprene rubber. In order to improve the vulcanization speed, vulcanization degree and vulcanization efficiency, high content of sulfur is usually used Sulfenamide and thiuram accelerators, in the production process, the use of these materials can easily cause the phenomenon of "sulphur spraying" of rubber protective caps, and the UV absorbance, reducing substances and pH changes of the finished products can easily exceed the standard. Therefore, it is usually necessary to use a certain concentration of acid and alkali to carry out high-pressure extraction treatment on the product. The production process is complicated and cumbersome, and it is easy to cause product pollution and environmental pollution.

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