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CN-122008664-A - Weather-resistant rubber material for pet trolley and preparation method thereof

CN122008664ACN 122008664 ACN122008664 ACN 122008664ACN-122008664-A

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a weather-resistant rubber material for a pet trolley and a preparation method thereof; the invention aims at the technical problems of poor compatibility and insufficient long-acting performance of the traditional multifunctional auxiliary agent component and a matrix material, and adopts a four-layer coextrusion structure, wherein the four-layer coextrusion structure comprises a base layer, a functional layer, a buffer layer and a surface layer, the base layer takes high-density polyethylene as a main body and contains an elastic toughening component, the functional layer contains a thermoplastic elastomer matrix and nano silicon dioxide filler pretreated by a silane coupling agent, the buffer layer adopts an aliphatic thermoplastic polyurethane elastomer, and the surface layer takes the thermoplastic elastomer as the matrix and is added with liquid rubber coated multifunctional auxiliary agent composite powder.

Inventors

  • Fang Lukai
  • WANG TAO

Assignees

  • 湖北逗哈哈科技有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. A weatherable rubber material for a pet cart, comprising: The rubber material is of a four-layer coextrusion composite structure, and comprises a base layer, a functional layer, a buffer layer and a surface layer from bottom to top, wherein the base layer consists of high-density polyethylene and polyolefin elastomer toughening agent, the functional layer consists of thermoplastic elastomer and nano silicon dioxide filler pretreated by silane coupling agent, the buffer layer is aliphatic thermoplastic polyurethane elastomer, the surface layer consists of thermoplastic elastomer as a matrix and contains functional additive composite powder, the functional additive composite powder is coated by bifunctional liquid rubber, the bifunctional liquid rubber is prepared by respectively refining isoprene, 2-vinylpyridine and glycidyl methacrylate, sequentially adding the refined isoprene, 2-vinylpyridine and glycidyl methacrylate into toluene solvent, adding the dried dithiobenzoate and azodiisobutyronitrile, stirring, freezing-vacuumizing-thawing, filling high-purity nitrogen, preheating to 65-70 ℃, cooling in an ice water bath after the reaction, dropping methanol for precipitation, filtering, washing and drying.
  2. 2. A weather resistant rubber material for pet carts as in claim 1, wherein: the base layer comprises, by mass, 70% -90% of high-density polyethylene and 10% -30% of a polyolefin elastomer toughening agent.
  3. 3. A weather resistant rubber material for pet carts as in claim 1, wherein: The functional layer comprises the following raw materials in parts by weight, based on 100 parts of thermoplastic elastomer, 3-8 parts of nano SiO 2 modified by a silane coupling agent.
  4. 4. A weather resistant rubber material for pet carts as in claim 1, wherein: The functional auxiliary agent composite powder comprises, by weight, 300-500 parts of polytetrafluoroethylene micro powder subjected to tetrahydrofuran etching treatment, 150-200 parts of silver-loaded zinc zeolite and 20-25 parts of ultraviolet resistant agent based on 100 parts of difunctional liquid rubber.
  5. 5. A weather resistant rubber material for pet carts as in claim 1, wherein: The weather-resistant rubber material comprises the following layers in proportion of (8-12) of a base layer, (3-5) of a buffer layer and (1-2) of a surface layer.
  6. 6. A method of preparing a weatherable rubber material for pet carts according to any one of claims 1 to 5, comprising the steps of: S1, preparing dual-functional liquid rubber, namely respectively refining isoprene, 2-vinyl pyridine and glycidyl methacrylate, sequentially adding the refined isoprene, the 2-vinyl pyridine and the glycidyl methacrylate into a toluene solvent, adding the sodium dithiobenzoate and the azodiisobutyronitrile, stirring, freezing, vacuumizing, thawing, charging high-purity nitrogen, preheating to 65-70 ℃, cooling in an ice water bath after the reaction is finished, dripping methanol for precipitation, filtering, washing and drying to obtain the dual-functional liquid rubber; S2, in-situ anchoring modification; s21, adding the difunctional liquid rubber prepared in the step S1 into toluene, and stirring to obtain a liquid rubber solution with the mass fraction of 10%; s22, adding polytetrafluoroethylene micro powder, silver-loaded zinc zeolite and an ultraviolet resistant agent which are subjected to tetrahydrofuran etching treatment into the liquid rubber solution prepared in the step S21, stirring, ultrasonic dispersing, rotary steaming, drying and grinding to obtain functional auxiliary agent composite powder; s3, mixing and extruding; S31, melt blending the dried high-density polyethylene and the POE toughening agent grafted by maleic anhydride to obtain a base layer composite pellet; S32, premixing the thermoplastic elastomer and the nano SiO 2 modified by the silane coupling agent, and then melt blending to obtain functional layer granules; S33, melting the pure aliphatic thermoplastic polyurethane elastomer to obtain a buffer layer granule; S34, carrying out melt blending on the thermoplastic elastomer and the functional auxiliary agent composite powder prepared in the S22 to obtain surface layer granules; And S35, adjusting the extrusion speed of each extruder, obtaining a co-extrusion melt through co-extrusion, cooling and shaping, and carrying out electron irradiation to obtain the weather-resistant rubber material.
  7. 7. The method of manufacturing a weatherable rubber material for pet carts according to claim 6, wherein: The molar ratio of the 2-vinyl pyridine to the isoprene monomer is 0.05:1-0.15:1; The glycidyl methacrylate of the S1, wherein the molar ratio of the glycidyl methacrylate to the isoprene monomer is 0.05:1-0.15:1; s1, the molar ratio of the dithiobenzoic acid to the isoprene monomer is 1:1; The molar ratio of the azodiisobutyronitrile to the cumyl dithiobenzoate is 0.1:1-0.2:1; S1, freezing, vacuumizing and thawing, namely repeating the steps for 3 times, freezing by adopting liquid nitrogen, vacuumizing to 5Pa, maintaining for 5min, and thawing into warm water to be thawed to room temperature; and S1, setting parameters of the drying, namely, the temperature is 40 ℃ and the duration is 24 hours.
  8. 8. The method of manufacturing a weatherable rubber material for pet carts according to claim 6, wherein: S22, setting parameters of ultrasonic dispersion, wherein the power is 300-500W, the frequency is 20-40 kHz, and the time is 30-40 min; the spin steaming step S22 is characterized in that the parameter is set at the temperature of 60 ℃, the vacuum degree is minus 0.08 to minus 0.1MPa, and the rotating speed is 60-100 rpm.
  9. 9. The method of manufacturing a weatherable rubber material for pet carts according to claim 6, wherein: the parameters of the melt blending are set, namely, the temperature of a feeding section is 160-170 ℃, the temperature of a compression section is 170-180 ℃, the temperature of a metering section is 180-190 ℃ and the rotating speed of a screw is 20-60 rpm; The parameters of the melt blending in the step S32 are set to 170-180 ℃ of a feeding section, 180-190 ℃ of a compression section, 190-200 ℃ of a metering section and 20-60 rpm of a screw; The melting step S33 is characterized in that the temperature of a feeding section is 170-180 ℃, the temperature of a compression section is 180-190 ℃, the temperature of a metering section is 190-200 ℃, and the rotating speed of a screw is 20-60 rpm; The parameters of the melt blending in the step S34 are set to 170-180 ℃ of a feeding section, 180-190 ℃ of a compression section, 190-200 ℃ of a metering section and 20-60 rpm of a screw; the surface layer granule material of the S34 is prepared from the following raw materials in parts by weight, based on 100 parts of TPE, 10-15 parts of functional auxiliary agent composite powder.
  10. 10. The method of manufacturing a weatherable rubber material for pet carts according to claim 6, wherein: the coextrusion step S35 is characterized in that parameters are set, namely the temperature is 190-200 ℃, and the extrusion pressure is 8-15 MPa; s35, cooling and shaping, wherein parameters are set, namely the temperature of a first cooling roller is 40-60 ℃, and the temperature of a second cooling roller is 20-30 ℃; And S35, setting parameters of electron irradiation, namely, the irradiation dose is 70kGy, the accelerating voltage is 2MeV, and the beam current is 30mA.

Description

Weather-resistant rubber material for pet trolley and preparation method thereof Technical Field The invention belongs to the technical field of high polymer materials, and particularly relates to a weather-resistant rubber material for a pet trolley and a preparation method thereof. Background When the pet handcart is used in outdoor environment, the parts such as the tyre, the handle, the awning and the like need to be subjected to the tests such as sun exposure, rain, friction abrasion, microorganism erosion and the like for a long time. Therefore, the weather resistance of the material has strict requirements, including ultraviolet aging resistance, material cracking and aging prevention, good waterproof and mildew-proof performance and wear-resistant and shock-absorbing performance. However, the conventional rubber or plastic material often cannot meet the above-mentioned various performance requirements at the same time, and multifunctional aids such as an ultraviolet-resistant agent, an antibacterial agent, an antifriction and wear-resistant filler and the like need to be added into the matrix formulation to improve the material performance (CN 121226866 a). However, the direct addition of the auxiliary agent to the polymer matrix has some problems that on one hand, the particle sizes and the surface polarities of different auxiliary agents are different, the compatibility with the matrix rubber or plastic is poor, uneven dispersion, agglomeration or migration precipitation easily occur, the mechanical properties of the materials are reduced, the effect of the auxiliary agent is attenuated, and on the other hand, the auxiliary agent is likely to gradually run off or lose activity in the use process, and the long-term efficacy is difficult to ensure. In addition, polytetrafluoroethylene (PTFE) micropowder is often used as a filler for reducing frictional wear, but PTFE is extremely inert and lacks interfacial effect with many polymers, and when added directly, tends to be poorly dispersed, and thus cannot sufficiently exert lubricating and wear-resistant effects. To address the above problems, some technical approaches have been proposed. For example, by coating a layer of polymer modifier on the surface of the inorganic auxiliary agent, the dispersibility and compatibility of the auxiliary agent in the rubber matrix can be improved, and the interfacial binding force between the auxiliary agent and the matrix can be enhanced. As another example, it is also effective to add liquid rubber as a compatibilizer to the rubber formulation. In addition, in the structural design of the product, the materials with different functions can be combined together by adopting a multilayer coextrusion composite technology, so that various performance requirements are met simultaneously. In summary, in the prior art, there is still a large improvement space for compatibility and duration of action between the functional auxiliary agent and the matrix material, and a new material structure and preparation method are needed to significantly improve the comprehensive performance and durability of the pet trolley material. Disclosure of Invention The invention provides a weather-resistant rubber material for a pet trolley and a preparation method thereof, and aims to solve the problems of poor compatibility and short action duration between a functional auxiliary agent and a matrix material. The specific technical scheme is as follows: a weather-resistant rubber material for a pet trolley and a preparation method thereof are as follows: S1, preparing dual-functional liquid rubber, namely respectively refining isoprene, 2-vinylpyridine and glycidyl methacrylate, sequentially adding the refined isoprene, the 2-vinylpyridine and the glycidyl methacrylate into a toluene solvent, adding the sodium dithiobenzoate and the azodiisobutyronitrile, stirring, freezing, vacuumizing, thawing, charging high-purity nitrogen, preheating to 65-70 ℃, cooling in an ice water bath after the reaction is finished, dripping methanol for precipitation, filtering, washing and drying to obtain the dual-functional liquid rubber. S2, in-situ anchoring modification. And S21, adding the difunctional liquid rubber prepared in the step S1 into toluene, and stirring to obtain a liquid rubber solution with the mass fraction of 10%. And S22, adding polytetrafluoroethylene micro powder, silver-loaded zinc zeolite and an ultraviolet resistant agent which are subjected to tetrahydrofuran etching treatment into the liquid rubber solution prepared in the step S21, stirring, performing ultrasonic dispersion, performing rotary evaporation, drying and grinding to obtain the functional auxiliary agent composite powder. S3, mixing and extruding. And S31, melt blending the dried high-density polyethylene (HDPE) and polyolefin elastomer (POE) toughening agent to obtain the composite granules of the base layer. S32, premixing a thermoplastic elastomer (TPE) and nano SiO