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Preparation method of modified polyvinyl chloride

A polyvinyl chloride, modified technology, applied in the field of polymers, can solve the problems of non-sterilization, destruction of the atmospheric ozone layer, and incomplete sterilization of ethylene oxide.

Inactive Publication Date: 2014-12-10
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic flexible PVC disposable medical devices (tools) are mainly sterilized by ethylene oxide, but this sterilization method has the following problems: (1) Ethylene oxide is not completely sterilized, and there are unsterilized Bacterial dead corners, which bring safety hazards to the use of medical devices (tools); (2) Ethylene oxide is a carcinogen, and residual ethylene oxide may endanger the health of patients, operators and medical staff; (3) It will cause Environmental pollution and destruction of the atmospheric ozone layer; (4) long sterilization cycle (tens of hours)
However, the antioxidant in the polyvinyl chloride obtained by this method is easy to separate out from the PVC product, resulting in an unsustainable anti-radiation aging effect.

Method used

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  • Preparation method of modified polyvinyl chloride
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preparation example Construction

[0024] The invention provides a kind of preparation method of modified polyvinyl chloride, comprises the following steps:

[0025] a) Mix polyvinyl chloride, unsaturated reactive hindered amine and initiator, and after grafting reaction, obtain hindered amine graft-modified polyvinyl chloride;

[0026] b) After mixing polyvinyl chloride, plasticizer, epoxy ester compound, calcium zinc stabilizer and metal soap compound, melt extruding to obtain a polyvinyl chloride composition;

[0027] c) melt extruding the hindered amine graft modified polyvinyl chloride obtained in step a) and the polyvinyl chloride composition obtained in step b) to obtain modified polyvinyl chloride;

[0028] The steps a) and b) are not limited in time order.

[0029] The method provided by the invention uses unsaturated reactive hindered amines to graft and modify polyvinyl chloride. Uniform dispersion on vinyl chloride can guarantee the anti-radiation performance of polyvinyl chloride for a long time....

Embodiment 1

[0053] Add 19.9g of acryloyl chloride into a three-necked flask containing 100mL of dry toluene, and cool the resulting solution in an ice bath, then slowly add 31.2g of 4-amino-2,2,6,6-tetra Methyl piperidine, the time of dropping is 30min, after reacting the obtained mixed solution for 2h under the condition of stirring, a white precipitate is obtained; the obtained white precipitate is filtered, and the molar concentration is 0.2mol / L sodium hydroxide The solution was washed and then recrystallized from pentanol to give 4-acrylamido-2,2,6,6-tetramethylpiperidine.

Embodiment 2

[0055] 1000 grams of polyvinyl chloride, 10 grams of 4-acrylamido-2,2,6,6-tetramethylpiperidine prepared in Example 1 and 5 grams of 2,5-dimethyl-2,5-di-tert The butyl peroxide hexane initiator is mixed in a high stirrer, and then the mixture obtained is added to a twin-screw extruder to carry out melt grafting reaction extrusion, and the reaction extrusion temperature is 160 ° C, and the screw speed is 150 rpm. The reaction time is 1.8 minutes, and the hindered amine 4-acrylamido-2,2,6,6-tetramethylpiperidine graft-modified polyvinyl chloride A is obtained;

[0056] 1000 grams of polyvinyl chloride, 500 grams of bis(2-ethylhexyl) phthalate, 30 grams of epoxy soybean oil, 20 grams of calcium zinc stabilizer, 3 grams of calcium stearate and 3 grams of zinc stearate After hot mixing and cold mixing in a high mixer, the obtained mixture is put into a twin-screw extruder for melt reaction extrusion. The extrusion temperature is 165°C, the screw speed is 130rpm, and the residence t...

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Abstract

The invention provides a preparation method of modified polyvinyl chloride. The preparation method comprises the following steps of: a) mixing polyvinyl chloride, unsaturated reaction type hindered amine and an initiator and carrying out grafting reaction to obtain hindered amine graft modified polyvinyl chloride; b) mixing polyvinyl chloride, a plasticizer, an epoxy ester type compound, a calcium-zinc stabilizer and a metallic soap type compound and carrying out melt extrusion to obtain a polyvinyl chloride composition; and c) carrying out melt extrusion on the hindered amine graft modified polyvinyl chloride obtained in the step a) and the polyvinyl chloride composition obtained in the step b) to obtain modified polyvinyl chloride, wherein the step a) and the step b) are not limited by time sequence. In the structure of modified polyvinyl chloride obtained through the method, a hindered amine radical capture agent is bonded to a polyvinyl chloride molecular chain in a chemical bond form, the dispersion is uniform and the anti-irradiation performance is lasting.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a preparation method of modified polyvinyl chloride. Background technique [0002] Polyvinyl chloride is a general-purpose synthetic resin. According to the different plasticizers added, it can be divided into two types: hard and soft PVC. Soft polyvinyl chloride has many advantages such as high strength and modulus, softness, good resilience, transparency and low price, so it is the main raw material for making disposable medical infusion and storage devices, and has been widely used in the production of infusion sets , blood bags, catheters, intestinal nutrition tubes, peritoneal dialysis bags, extracorporeal circulation lines, hemodialysis lines, and various medical catheters and other disposable medical infusion and storage devices. [0003] In order to protect the health of patients, sterilization of medical devices (instruments) before use is a necessary step. At presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/06C08L51/06C08F259/04B29C47/92B29C48/92
CPCB29C47/92
Inventor 石恒冲殷敬华尹立刚施德安
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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