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High-efficiency antimicrobial thermoplastic elastomer and preparation method thereof

A thermoplastic elastomer and high-efficiency technology, applied in the field of high-efficiency antibacterial thermoplastic elastomer and its preparation, can solve the problems of toxic decomposition products, strong surface polarity, shortened antibacterial life, etc., and achieve stable performance without changing mechanical properties and processing properties. , the effect of low price

Inactive Publication Date: 2013-06-26
绍兴市聚成新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic antibacterial agents have good antibacterial effects, but their lifespan is short, and they have toxicity and safety problems, which will cause microbial resistance, poor chemical stability, and easy migration in plastics (resulting in shortened antibacterial lifespan) and other deficiencies.
In addition, the Achilles heel of poor heat resistance of organic antibacterial agents makes it easy to decompose and fail under the processing conditions of high temperature, high pressure and high shear of many plastics, and its decomposition products are even toxic.
Inorganic antibacterial agents are the most widely used silver-based antibacterial agents. The advantages are safety, heat resistance, and durability; the disadvantages are high price and poor antibacterial durability. Silver ions are easy to generate silver oxide or be reduced to metal by photocatalysis. Silver, so there is a defect of discoloring the product
In addition, due to the small particle size, strong surface polarity and high surface energy of the inorganic antibacterial agent, it is easy to agglomerate, and it is not easy to disperse uniformly in the thermoplastic elastomer, so that the performance of the composite plastic can not meet the expected goals. , the surface must be modified first, and the process is complicated

Method used

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  • High-efficiency antimicrobial thermoplastic elastomer and preparation method thereof
  • High-efficiency antimicrobial thermoplastic elastomer and preparation method thereof
  • High-efficiency antimicrobial thermoplastic elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mix 50 kg of SEBS and 60 kg of white oil and stir evenly; mix 7.5 kg of PP resin, 1g of ZnSt, 10 kg of light active CaCO 3 and 0.2 kg of zinc pyrithione were added to the high-speed mixer in turn, and fully stirred and mixed; fully stirred and mixed under high-speed stirring, when the temperature rose to 50 ° C, stopped stirring, and took the material; fully stirred and pre-plasticized The mixture is Mixing and plasticizing on a twin-screw extruder, extruding to obtain the product of the present invention, the process conditions of the extruder are: 185°C in the first zone, 195°C in the second zone, 200°C in the third zone, 205°C in the fourth zone, and 210°C in the fifth zone ℃, 210℃ in the sixth zone, 200℃ in the seventh zone, 190℃ in the eighth zone, and 195℃ in the machine head.

Embodiment 2

[0038] Mix 50 kg of SEBS and 52 kg of white oil and stir evenly; mix 10 kg of PP resin, 1.7 g of ZnSt 2 , 5 kg of light active CaCO 3 and 0.6 kg of pyrithione zinc were added to the high-speed mixer in turn, and fully stirred and mixed; under high-speed stirring, fully stirred and mixed, when the temperature rose to 50 ° C, stopped stirring, and took the material; fully stirred the pre-plasticized mixture Mixing, plasticizing and extruding on a twin-screw extruder to obtain the product of the present invention. The process conditions of the extruder are: 185°C in the first zone, 195°C in the second zone, 200°C in the third zone, 205°C in the fourth zone, and 205°C in the fifth zone 210°C, 210°C in the sixth zone, 200°C in the seventh zone, 190°C in the eighth zone, and 195°C at the machine head. .

Embodiment 3

[0040] Mix 60 kg of SEBS and 60 kg of white oil and stir evenly; mix 15 kg of PP resin, 1.8g of ZnSt 2 , 18 kg of light active CaCO 3 and 0.35 kg of pyrithione zinc were added to the high-speed mixer in turn, and fully stirred and mixed; under high-speed stirring, fully stirred and mixed, when the temperature rose to 50 ° C, stopped stirring, and took the material; fully stirred the pre-plasticized mixture Mixing, plasticizing and extruding on a twin-screw extruder to obtain the product of the present invention. The process conditions of the extruder are: 185°C in the first zone, 195°C in the second zone, 200°C in the third zone, 205°C in the fourth zone, and 205°C in the fifth zone 210°C, 210°C in the sixth zone, 200°C in the seventh zone, 190°C in the eighth zone, and 195°C at the machine head.

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Abstract

The invention relates to a preparation method of a high-efficiency antimicrobial thermoplastic elastomer, which comprises the following steps: A. sufficiently mixing SEBS (styrene-ethylene-butadiene-styrene) and white oil according to the formula, and uniformly stirring to obtain an expansion mixture; B. sequentially adding PP (polypropylene), ZnSt2, filler and zinc pyrithione into a high-speed stirrer according to the formula, and sufficiently stirring and mixing to obtain a solid mixture; C. in the high-speed stirring state, adding the liquid mixture obtained in the step A into the solid mixture obtained in the step B, sufficiently stirring and mixing, and stopping stirring when the temperature rises to 50 DEG C, thereby obtaining a preplasticized powder mixture; and D. banburying, plasticizing and extruding the preplasticized powder mixture in the step C in a double screw extruder to obtain the product, wherein the technological conditions of the extruder are as follows: the temperature of the first region is 185 DEG C, the temperature of the second region is 195 DEG C, the temperature of the third region is 200 DEG C, the temperature of the fourth region is 205 DEG C, the temperature of the fifth region is 210 DEG C, the temperature of the sixth region is 210 DEG C, the temperature of the seventh region is 200 DEG C, the temperature of the eighth region is 190 DEG C, and the temperature of the head is 195 DEG C.

Description

(1) Technical field [0001] The invention relates to a high-efficiency antibacterial thermoplastic elastomer and a preparation method thereof, which are suitable for soft plastic products such as household pads, food packaging, children's toys and inflatable products. (2) Background technology [0002] The plastic products that people come into contact with in daily life, especially the surfaces of household pads, food packaging, children's toys and inflatable products, may be contaminated and breed a variety of pathogenic bacteria, which will become the infectious agent of diseases, thus affecting human health. threatening. In order to inhibit bacteria, antibacterial plastics prepared by organic antibacterial agents and inorganic antibacterial agents are usually used. Organic antibacterial agents have good antibacterial effect, but their lifespan is short, and they have toxicity and safety problems, and they will have deficiencies such as microbial resistance, poor chemical...

Claims

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Application Information

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IPC IPC(8): C08L53/02C08L23/12C08K13/02C08K5/36C08K5/098C08K3/26C08K3/36C08K3/22B29C47/92B29C48/92
CPCB29C48/40B29C48/875B29C48/92B29C2948/92704B29C2948/92895B29C2948/92904
Inventor 杨建江陈枫
Owner 绍兴市聚成新材料科技股份有限公司
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