Polyolefin thermoplastic elastomer blending resin and preparation method thereof

Abstract

The invention provides a polyolefin thermoplastic elastomer blended resin and a method for preparation the same. The resin is prepared through a melting and blending method and comprises the following compositions: (A) a segmented copolymer accounting for 60 to 80 percent of gross weight of which the middle part is an irregular copolymer chain segment of ethene and 1-butylene, and two ends are capped through styrene chain segments; (B) polypropylene resin accounting for 10 to 30 percent of gross weight; and (C) polyethylene resin accounting for 5 to 20 percent of gross weight. The blended resin has innocuity, does not need to add a plasticizer in processing, does not have dangers that a compound is precipitated out, pollutes medical liquid and enters human body, and can be used for manufacturing a vessel for storing human blood and blood compositions.

Description

technical field

[0001] The invention belongs to the technical field of polyolefin blended resins. Specifically, the invention relates to medical polyolefin thermoplastic elastomer blended resins and a preparation method thereof. The resin can be used to manufacture containers for storing human blood and blood components. Background technique

[0002] We know that polyvinyl chloride (PVC) is widely used as a raw material for the production of disposable infusion sets and blood transfusion sets at home and abroad due to its cheap price and excellent comprehensive physical and mechanical properties. With the extensive and in-depth clinical application and the development of related medical science and technology, people found that PVC material itself has potential safety hazards, and there are various deficiencies in processing and use performance. If there is a very small amount of vinyl chloride monomer remaining in PVC resin, this compound has been proven to be a carcinogen....

Examples

Embodiment 1

[0015] Example 1 According to the weight ratio of 42 / 28 / 20 / 10, the components A1, A2, B2 and C1 were formulated into a blended resin, and mixed in a high-speed mixer for 5 minutes to obtain a premix. The above-mentioned premixed material is transported to a reactive twin-screw extruder. The screw diameter of the extruder is 40mm, and the aspect ratio is 36. The temperature of the extruder along the feeding port to the die is set at 140-230°C. The die temperature was 220°C. The blend was extruded through a die, cooled, and pelletized to obtain a blended resin, and the melt flow rate was tested. The blended resin was molded into a standard sample of 0.5 mm to test its light transmittance and haze; the blended resin was injected into a standard sample to test the surface hardness and mechanical properties. The test results are summarized in Table 2.

Embodiment 2

[0016] Example 2 According to the weight ratio of 45 / 30 / 15 / 10, the components A1, A3, B1 and C2 are formulated into a blended resin, except that the temperature of the extruder along the feeding port to the die is set at 150-240 °C and Except that the die temperature was set at 230°C, the equipment, processing conditions and steps used were the same as in Example 1, and the same method as in Example 1 was used for sample preparation, and the corresponding performance indicators were tested. The results are listed in Table 2 middle.

Embodiment 3

[0017] Embodiment 3 Components A2, A3, B2 and C2 are formulated into blended resins according to the weight ratio of 55 / 25 / 12 / 8. The equipment, processing conditions and steps used are all the same as in Example 2. The same method as Example 1 was used for sample preparation, and the corresponding performance indicators were tested. The results are listed in Table 2.

technical field

[0001] The invention belongs to the technical field of polyolefin blended resins. Specifically, the invention relates to medical polyolefin thermoplastic elastomer blended resins and a preparation method thereof. The resin can be used to manufacture containers for storing human blood and blood components. Background technique

[0002] We know that polyvinyl chloride (PVC) is widely used as a raw material for the production of disposable infusion sets and blood transfusion sets at home and abroad due to its cheap price and excellent comprehensive physical and mechanical properties. With the extensive and in-depth clinical application and the development of related medical science and technology, people found that PVC material itself has potential safety hazards, and there are various deficiencies in processing and use performance. If there is a very small amount of vinyl chloride monomer remaining in PVC resin, this compound has been proven to be a carcinogen....

Examples

Embodiment 1

[0015] Example 1 According to the weight ratio of 42 / 28 / 20 / 10, the components A1, A2, B2 and C1 were formulated into a blended resin, and mixed in a high-speed mixer for 5 minutes to obtain a premix. The above-mentioned premixed material is transported to a reactive twin-screw extruder. The screw diameter of the extruder is 40mm, and the aspect ratio is 36. The temperature of the extruder along the feeding port to the die is set at 140-230°C. The die temperature was 220°C. The blend was extruded through a die, cooled, and pelletized to obtain a blended resin, and the melt flow rate was tested. The blended resin was molded into a standard sample of 0.5 mm to test its light transmittance and haze; the blended resin was injected into a standard sample to test the surface hardness and mechanical properties. The test results are summarized in Table 2.

Embodiment 2

[0016] Example 2 According to the weight ratio of 45 / 30 / 15 / 10, the components A1, A3, B1 and C2 are formulated into a blended resin, except that the temperature of the extruder along the feeding port to the die is set at 150-240 °C and Except that the die temperature was set at 230°C, the equipment, processing conditions and steps used were the same as in Example 1, and the same method as in Example 1 was used for sample preparation, and the corresponding performance indicators were tested. The results are listed in Table 2 middle.

Embodiment 3

[0017] Embodiment 3 Components A2, A3, B2 and C2 are formulated into blended resins according to the weight ratio of 55 / 25 / 12 / 8. The equipment, processing conditions and steps used are all the same as in Example 2. The same method as Example 1 was used for sample preparation, and the corresponding performance indicators were tested. The results are listed in Table 2.

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