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CN-121991456-A - Thermoplastic elastomer for casters and preparation method thereof

CN121991456ACN 121991456 ACN121991456 ACN 121991456ACN-121991456-A

Abstract

The invention is suitable for the technical field of material preparation, and particularly relates to a thermoplastic elastomer for casters and a preparation method thereof, wherein the thermoplastic elastomer for casters comprises the following components, by mass, 35% -65% of total SEBS, 65% -100% of linear SEBS with high molecular weight and/or ultrahigh molecular weight, 20% -40% of plasticizer, 5% -20% of polyphenyl ether resin, 10% -25% of polyolefin resin, 5% -20% of polyolefin elastomer, 0% -20% of inorganic filler and 0% -5% of other auxiliary agents. According to the thermoplastic elastomer for the castor, provided by the invention, the wear resistance, tear resistance and rebound resilience of the material can be obviously improved by limiting the high molecular weight linear SEBS with a specific proportion and introducing the polyphenyl ether and the polyolefin elastomer for composite reinforcement, so that the harsh requirements of the castor in high load or mobile use can be met.

Inventors

  • GONG YOUBING
  • YU YINGHUI
  • CAI WEITAO

Assignees

  • 深圳市豪塑实业有限公司

Dates

Publication Date
20260508
Application Date
20260320

Claims (7)

  1. 1. The thermoplastic elastomer for the caster is characterized by comprising the following components, by mass, 35% -65% of total SEBS, 65% -100% of total SEBS of high molecular weight and/or ultrahigh molecular weight, 20% -40% of plasticizer, 5% -20% of polyphenyl ether resin, 10% -25% of polyolefin resin, 5% -20% of polyolefin elastomer, 0% -20% of inorganic filler and 0% -5% of other auxiliary agents.
  2. 2. The thermoplastic elastomer for casters of claim 1, wherein said polyphenylene ether resin has an intrinsic viscosity of 0.25 to 0.45dl/g measured in chloroform at 25 ℃.
  3. 3. The thermoplastic elastomer for casters of claim 1, wherein the other auxiliary agent comprises one or more of an anti-aging agent, a toner and a lubricant.
  4. 4. The thermoplastic elastomer for casters of claim 3, wherein the aging inhibitor is one or more of a primary antioxidant, a secondary antioxidant, a metal deactivator, a UV absorber and a UV stabilizer.
  5. 5. A thermoplastic elastomer for casters as claimed in claim 3, characterized in that the lubricant is one or more of silicone, montan wax, montan acid wax and ethylene wax.
  6. 6. The thermoplastic elastomer for casters of claim 1, wherein the inorganic filler is one or more of glass fiber, calcium carbonate, talc, kaolin, mica, glass fiber powder, wollastonite and diatomaceous earth.
  7. 7. A process for the preparation of a thermoplastic elastomer for casters of any of claims 1 to 6, characterized in that it comprises: mixing, namely adding polyphenyl ether resin, a styrene thermoplastic elastomer, a plasticizer and polyolefin into a mixer according to a proportion to carry out dispersion mixing to obtain a premix; Melting extrusion, namely melting, mixing and extruding the premixed material through a double-screw extruder; The process parameters are that the temperature of each area of the extruder is controlled to be 190-270 ℃, the length-diameter ratio of the double-screw extruder is 36-56, and the screw rotating speed is 200-800 revolutions per minute; And (3) post-treatment, namely cooling, drying, granulating and packaging the extrudate to obtain a final product.

Description

Thermoplastic elastomer for casters and preparation method thereof Technical Field The invention belongs to the technical field of material preparation, and particularly relates to a thermoplastic elastomer for casters and a preparation method thereof. Background The caster wheel is used as a movable foundation stone in modern industry, is a key component for connecting all industrial links, and the performance of the caster wheel directly determines the movement efficiency, the running stability and the safety coefficient of equipment, and is an important supporting support for intelligent manufacturing and automatic production. The application coverage is extremely wide, and the core industry comprises logistics storage, intelligent manufacturing, medical treatment, new energy, automobile manufacturing and the like, wherein the demand ratio of logistics and furniture industry is up to 20% and 30%, and the demand speed increase in the fields of medical treatment, aerospace and the like is remarkable. The prior technical proposal belongs to the performance of the conventional thermoplastic elastomer materials, and has the defects of poor rebound resilience, such as PVC, unused high molecular weight or ultra-high molecular weight SEBS, poor heat resistance, easy appearance generation and insufficient welding line strength due to the fact that the high molecular weight or ultra-high molecular weight SEBS is not used and the polyphenyl ether resin is not added. Disclosure of Invention The invention aims to provide a thermoplastic elastomer for casters, and aims to solve the problems that the prior technical scheme is that the thermoplastic elastomer material for casters has the performance of a conventional thermoplastic elastomer material and has insufficient rebound resilience. The thermoplastic elastomer for the caster comprises the following components, by mass, 35% -65% of total SEBS, 65% -100% of total SEBS of high molecular weight and/or ultrahigh molecular weight, 20% -40% of plasticizer, 5% -20% of polyphenyl ether resin, 10% -25% of polyolefin resin, 5% -20% of polyolefin elastomer, 0% -20% of inorganic filler and 0% -5% of other auxiliary agents. Preferably, the polyphenylene ether resin has an intrinsic viscosity of 0.25 to 0.45dl/g as measured in chloroform at 25 ℃. Preferably, the other adjuvants include one or more of an anti-aging agent, a toner, and a lubricant. Preferably, the anti-aging agent is one or more of a primary antioxidant, a secondary antioxidant, a metal deactivator, a UV absorber, and a UV stabilizer. Preferably, the lubricant is one or more of silicone, montan wax, montan acid wax, and ethylene wax. Preferably, the inorganic filler is one or more of glass fiber, calcium carbonate, talcum powder, kaolin, mica, glass fiber powder, wollastonite and diatomite. Another object of the present invention is to provide a method for producing a thermoplastic elastomer for casters as described above, the method comprising: mixing, namely adding polyphenyl ether resin, a styrene thermoplastic elastomer, a plasticizer and polyolefin into a mixer according to a proportion to carry out dispersion mixing to obtain a premix; Melting extrusion, namely melting, mixing and extruding the premixed material through a double-screw extruder; The process parameters are that the temperature of each area of the extruder is controlled to be 190-270 ℃, the length-diameter ratio of the double-screw extruder is 36-56, and the screw rotating speed is 200-800 revolutions per minute; And (3) post-treatment, namely cooling, drying, granulating and packaging the extrudate to obtain a final product. The thermoplastic elastomer for the castor provided by the invention can obviously improve the wear resistance, tear resistance and rebound resilience of materials by limiting a high molecular weight linear SEBS (styrene-ethylene-butylene-styrene) and introducing polyphenyl ether and a polyolefin elastomer for composite reinforcement, meets the severe requirements of the castor in high load or mobile use, improves the fluidity of a system by adding the plasticizer and POE, reduces the processing difficulty caused by high-hardness resin, ensures the full dispersion and plasticization of each component, particularly high-viscosity PPO and SEBS by virtue of the design of a large length-diameter ratio and high rotation speed of a double-screw extrusion process, and enables the formulation to be flexibly adjusted according to the specific application scene of the castor, such as indoor silence, outdoor UV resistance, heavy load resistance and the like by setting the range of 0% -X% of inorganic fillers and various auxiliaries. Detailed Description The present invention will be described in further detail below in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and ar