Preparation method of high-transparency medical PVC (polyvinyl chloride) hard sheet

Abstract

The invention discloses a preparation method of a high-transparency medical PVC (polyvinyl chloride) hard sheet, belonging to the technical field of medical material preparation. The method comprises the following steps: modifying nano silicon dioxide with a silane coupling agent, mixing the modified nano silicon dioxide with a heat stabilizer, a plasticizer and PVC, mixing a lubricant dimethyl silicone oil and an anti-yellowing agent blue ultramarine with the self-made modified nano silicon dioxide, and carrying out extrusion granulation and calendering molding to obtain the high-transparency medical PVC hard sheet. The PVC is treated by different temperature gradients and stirring rotation speeds, so that the PVC granules are broken and refined, thereby enhancing the transparency after molding; and the modified nano silicon dioxide is added to permeate into the defects and near the residual unsaturated double bonds in the PVC, acts with unsaturated electron clouds, and is combined with the PVC macromolecule to form a network structure, thereby achieving the goal of enhancing strength and toughness and increasing light stability on the premise of enhancing the transparency of the material, and effectively solving the problems of low transparency and high yellowing tendency in the traditional PVC hard sheet.

Description

technical field [0001] The invention discloses a preparation method of a high-transparency medical PVC hard sheet, belonging to the technical field of medical material preparation. Background technique [0002] PVC is one of the five major thermoplastic synthetic resins, widely used in construction, automotive aerospace, electronics, electrical appliances, packaging and other fields. PVC hard sheet has advantages in strength, transparency, dielectric properties, flame retardancy, etc., and is widely used in the packaging field. [0003] The blister packaging of medicines, also known as blister packaging, is to place the medicines in the pits (called blisters or blisters) of the packaging hard sheet formed by vacuum blister molding or cold stamping, and then coated with heat The medicine packaging of the sealing layer is heat-sealed with aluminum foil to form a unit package, so that the medicine is safely protected. At present, the packaging of large granular pills on the m...

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention: In the preparation process of the traditional medical PVC hard sheet, affected by the polyvinyl chloride raw material and processing parameters, the resulting hard sheet has low transparency and is prone to yellowing during use, which limits its application range To solve the problem, a method of adding self-made modified nano-silica to prepare high-transparency medical PVC hard sheet under different temperature gradients and stirring speed conditions is provided. The present invention first uses silane coupling agent to modify nano-silica Silicon, then use dioctyltin dilaurate as heat stabilizer, trioctyl trimellitate as plasticizer, mix with polyvinyl chloride under relatively low temperature and low speed stirring conditions, and then use dimethyl silicone oil as lubricant , Ultramarine is an anti-yellow agent, adding self-made modified nano-silica to mix, under the condition of relatively high temperature and high-speed stirring, the additive enters the pores of polyvinyl chloride particles under the action of stirring and heat, making the particles more dense and the surface It is smoother, and finally extruded and granulated and then calendered to obtain a high-transparency medical PVC hard sheet. The present invention makes full use of different temperature gradients and stirring speeds to treat polyvinyl chloride, so that the polyvinyl chloride particles are crushed and refined, and the granules are obtained. The plasticized particles with uniform diameter and shape can improve the transparency after molding, and then use the added modified nano-silica to infiltrate the defects and residual unsaturated double bonds in PVC, and generate with the unsaturated electron cloud Function, combine with polyvinyl chloride macromolecules to form a network structure, further improve the transparency of the material, and at the same time achieve the purpose of reinforcement and toughness and improve light stability, effectively solve the problem of low transparency and easy yellowing of traditional PVC hard sheets question