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TPE (Thermoplastic Elastomer) material for medical supplies

A kind of technology of thermoplastic elastomer, medical supplies

Inactive Publication Date: 2015-08-05
DONGGUAN LIHONG PLASTIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of high production cost, low efficiency, inability to recycle and reuse and degrade the silica gel used for pistons in existing medical syringes, and to provide a thermoplastic elastomer material for medical supplies, which can be directly used for traditional injection molding. Machine direct molding, low cost, high efficiency, and the leftovers can be recycled for secondary reuse, which can not only meet all the functions of the silicone piston in the existing medical syringe, but also solve the problem that the medical syringe is discarded after one-time use and the internal piston cannot be recycled. The problem of recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A thermoplastic elastomer material for medical supplies provided in this embodiment, its formula includes the following components in parts by weight:

[0044] Styrene-butadiene-styrene triblock copolymer 30%;

[0045] Paraffin oil 20%;

[0046] Polypropylene 20%;

[0047] EPDM / PP system thermoplastic dynamic vulcanizate 25%;

[0048] Talc 5%.

[0049] Among them, the number average molecular weight of the styrene-butadiene-styrene triblock copolymer is 200,000.

[0050] Its preparation method comprises the following steps:

[0051] The first step, pre-filling with oil: add styrene-butadiene-styrene triblock copolymer into paraffin oil at 80°C and stir for 2 hours, then place it for 48 hours for later use;

[0052] The second step, pre-production preparation: medical-grade cleaning of the batching barrels, twin-screw extruders, cooling circulating water and finished product barrels;

[0053] The third step, batching: add the pre-filled oil powder obtained in the f...

Embodiment 2

[0057] A thermoplastic elastomer material for medical supplies provided in this embodiment, its formula includes the following components in parts by weight:

[0058] Styrene-isoprene-styrene triblock copolymer 34%;

[0059] Paraffin oil 16%;

[0060] Polypropylene 18%;

[0061] NBR / PP system thermoplastic dynamic vulcanizate 22%;

[0062] Calcium carbonate 10%;

[0063] Among them, the number average molecular weight of the styrene-butadiene-styrene triblock copolymer is 150,000.

[0064] Its preparation method comprises the following steps:

[0065] The first step, pre-filling with oil: add styrene-isoprene-styrene triblock copolymer into paraffin oil at 90°C and stir for 1 hour, then place it for 70 hours for later use;

[0066] The second step, pre-production preparation: medical-grade cleaning of the batching barrels, twin-screw extruders, cooling circulating water and finished product barrels;

[0067] The third step, batching: add the pre-filled oil powder obtained ...

Embodiment 3

[0071] A thermoplastic elastomer material for medical supplies provided in this embodiment, its formula includes the following components in parts by weight:

[0072] Hydrogenated styrene-butadiene-styrene triblock copolymer 24%;

[0073] Paraffin oil 22%;

[0074] Polypropylene 22%;

[0075] Styrene butadiene rubber / ethylene-vinyl acetate copolymer system thermoplastic dynamic vulcanizate 30%;

[0076] Calcium sulfate 2%;

[0077] Among them, the number average molecular weight of the styrene-butadiene-styrene triblock copolymer is 120,000.

[0078] Its preparation method comprises the following steps:

[0079] The first step, pre-filling with oil: add hydrogenated styrene-butadiene-styrene triblock copolymer into paraffin oil at 85°C and stir for 3 hours, then place it for 15 hours for later use;

[0080] The second step, pre-production preparation: medical-grade cleaning of the batching barrels, twin-screw extruders, cooling circulating water and finished product barre...

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Abstract

The invention belongs to the field of rubber technology, in particular to a TPE (Thermoplastic Elastomer) material for medical supplies. A formula comprises the following components in parts by weight: 20-50% of styrene segmented copolymer, 15-40% of paroline, 15-25% of polypropylene, 20-40% of thermoplastic dynamic vulcanizate and 0-15% of mineral filler. Compared with the prior art, the TPE material obtained by the formula and the process of the invention has various excellent capacities of high elasticity, high intensity, high rebound resilience, ageing resistance and oil resistance of a traditional cross-linking vulcanized rubber, and has the characteristics of ordinary plastic of being convenient to process and wide in processing way; furthermore, crushed corners can be directly and secondarily used by 100%; in addition, the processing process can be simplified, and the processing cost can be reduced; furthermore, the TPE is environmental-friendly, toxic-free and safe, and is wide in rigidity scope, flexible in feeling, and excellent in weather fastness, fatigue resistance and temperature tolerance and processing performance, and is free from vulcanization is not needed, and the cost can be reduced by recycling.

Description

technical field [0001] The invention belongs to the technical field of rubber, in particular to a thermoplastic elastomer material for medical supplies. Background technique [0002] At present, the pistons in medical syringes used in hospitals are basically produced using traditional silica gel materials, and the production process of silica gel is complicated. Before the production of silica gel, it needs to be mixed in an internal mixer with an equipment cost of nearly one million yuan. , and then molded, so the production cost is high, the efficiency is low, and the scraps of silica gel cannot be recycled and reused; and the current medical syringes are all disposable and discarded after use. The piston in the discarded medical syringe cannot be recycled, because the disadvantage of silica gel is that it cannot be recycled and reused, and it is not easy to degrade. If the degradation conditions are relatively harsh, it must be carried out in a strong acid or strong alkal...

Claims

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Application Information

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IPC IPC(8): C08L53/02C08L91/06C08L23/12C08L23/16C08L9/02C08L9/06C08L23/08C08K3/34C08K3/26C08K3/30
Inventor 程勇
Owner DONGGUAN LIHONG PLASTIC CO LTD
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