Delustring medical soft PVC modified material with low temperature resistance and low DOP precipitation

Abstract

The invention discloses a delustring medical soft PVC modified material with low temperature resistance and low DOP precipitation, which is prepared from the following ingredients in parts by weight: 100 parts of PVC resin powder, wherein the PVC resin powder consists of the following ingredients in parts by weight: 20% to 80% of delustring resin powder ( with the degree of polymerization ranging from 1000 to 1500 and 19.0% to 25.0% of the content of tetrahydrofuran insoluble substances, i.e. gel), 20 to 80% of common resin powder (with the degree of polymerization ranging from 1000 to 1800); 0 to 5 parts of acrylate copolymer modifier ACR, 20 to 80 parts of plasticizer DOP, 0.8 to 3 parts of stabilizer, 0.2 to 1.5 parts of antioxidant, 1 to 6 parts of assistant stabilizer, i.e. epoxidized soybean oil, and 0.2 to 0.8 parts of lubricant. The delustring medical soft PVC modified material includes excellent low temperature resistance and low plasticizer precipitation property, has the characteristics of delustring and is suitable for the manufacturing of disposable medical liquid (blood) infusion thin-film bag and soft catheter.

Description

[0001] technical field [0002] The invention relates to the field of PVC modified materials, in particular to a matting medical soft PVC modified material resistant to low temperature and low DOP precipitation. Background technique [0003] PVC is one of the five general-purpose plastics. Plasticized PVC has many advantages such as high strength and modulus, softness, good resilience, transparency and low price, so it is the main material for making disposable medical infusion devices. However, at the same time, the use of PVC materials to prepare infusion (blood) bags has the following disadvantages: 1) Poor flexibility at low temperature, especially when it is below -20°C, it becomes hard and easy to break; 2) DOP in PVC materials has a large migration, which is harmful to human health . 3) The liquid separation bags on the market tend to become sticky in a higher temperature environment. In order to solve the first problem, most manufacturers of PVC pellets curren...

AI Technical Summary

Problems solved by technology

However, at the same time, the use of PVC materials to prepare infusion (blood) bags has the following disadvantages: 1) Poor flexibility at low temperature, especially when it is below -20°C, it becomes hard and easy to break; 2) DOP in PVC materials has a large migration, which is harmful to human health

3) Liquid separation bags on the market are prone to stickiness in a higher temperature environment

In order to solve the first problem, most manufacturers of PVC pellets currently use NBR, TPU, MBS, CPE, etc. to improve the low-temperature toughness of PVC. These methods increase the cost of materials, and are easy to cause PVC modification due to the impurity of materials. Materials do not meet medical requirements

Aiming at the problem of plasticizer precipitation of PVC materials, many manufacturers propose to use non-DOP plasticizers, such as citrates, DINCH (diisononyl cyclohexane 1,2-dicarboxylate), but citrates The plasticizer precipitates a lot, and the price of DINCH is too high

There is currently no good way to solve the problem of sticky surface for liquid separation bags made of ordinary PVC resin

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