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CN-121991455-A - High-wear-resistance thermoplastic poly-hydrogenated styrene-based composite material and preparation method thereof

CN121991455ACN 121991455 ACN121991455 ACN 121991455ACN-121991455-A

Abstract

The invention provides a high-wear-resistance thermoplastic polyhydrostyrene-based composite material and a preparation method thereof, wherein the composite material comprises, by weight, 25-55 parts of a first polyhydrostyrene rubber, 20-45 parts of a thermoplastic modifier, 5-20 parts of a second polyhydrostyrene rubber, 3-10 parts of a third polyhydrostyrene rubber, and additives such as a crosslinking auxiliary agent, a vulcanizing agent and the like. According to the invention, the mineral oil is completely replaced by the specific thermoplastic polymer, and a vulcanization system is introduced to form a dynamic micro-crosslinking network, so that the obtained composite material has good processability, high wear resistance and excellent weather resistance without a small molecular plasticizer.

Inventors

  • HAN YUHAO
  • YAO WEI
  • LIU SHUYANG
  • ZHAO CHUANG
  • YU TING
  • ZHOU XIAOMEI

Assignees

  • 南京聚隆科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260228

Claims (10)

  1. 1. The high wear-resistant thermoplastic poly-hydrogenated phenethyl composite material is characterized by comprising the following components in parts by weight: 25-55 parts of first hydrogenated styrene rubber; 20-45 parts of thermoplastic modifier; 5-20 parts of second hydrogenated styrene rubber; 3-10 parts of third hydrogenated styrene rubber; 0.4-3 parts of cross-linking auxiliary agent; 1-3 parts of vulcanizing agent; 0.1-0.5 part of antioxidant; 0.1-0.5 part of ultraviolet absorber; 0.5-2 parts of lubricant; The first hydrogenated styrene rubber is a linear triblock styrene block copolymer, the molecular weight of the first hydrogenated styrene rubber is greater than 55000 g/mol, and the mass fraction of styrene in the first hydrogenated styrene rubber is 15-25 wt%; The melt index of the second hydrogenated styrene rubber is more than 100g/10 min under the conditions of 230 ℃ and 2.16kg, and the styrene content in the second hydrogenated styrene rubber is 15-25 wt%; the third hydrogenated styrene rubber is maleic anhydride grafted hydrogenated styrene rubber with the mass fraction of maleic anhydride of 1-5 wt%, and the melt index of the third hydrogenated styrene rubber under the conditions of 230 ℃ and 5kg is 10-40 g/10min; The volume abrasion of the composite material is less than or equal to 30mm 3 , and the Shore hardness is 70A-95A or 25D-40D.
  2. 2. The high abrasion resistant thermoplastic polyhydrostyrene based composite of claim 1, wherein the first polyhydrostyrene rubber has a molecular weight distribution index of 1.05 to 1.3.
  3. 3. The high wear resistant thermoplastic polyhydrostyryl composite of claim 1, wherein said thermoplastic modifier is any one of high melt index polypropylene, thermoplastic polyurethane elastomer, thermoplastic polyester elastomer; wherein the melt index of the high melt index polypropylene is more than 100g/10 min under the conditions of 230 ℃ and 2.16 kg; The volume abrasion of the thermoplastic polyurethane elastomer is less than or equal to 60mm 3 , and the Shore hardness is 60A-95A or 25D-50D; The volume abrasion of the thermoplastic polyester elastomer is less than or equal to 60mm 3 , and the Shore hardness is 70A-95A or 25D-50D.
  4. 4. The high wear resistant thermoplastic polyhydrostyryl composite of claim 1, wherein the cross-linking aid is any one of triallyl isocyanate, N-m-phenyl bismaleimide.
  5. 5. The highly abrasion-resistant thermoplastic polyhydrostyryl composite of claim 1, wherein said vulcanizing agent is any one of dicumyl peroxide, 1, 4-bis-t-butylperoxyisopropyl benzene, benzoyl peroxide.
  6. 6. The high wear resistant thermoplastic polyhydrostyryl composite of claim 1, wherein the antioxidant comprises a primary antioxidant and a secondary antioxidant, the mass ratio of the primary antioxidant to the secondary antioxidant being 1:3; wherein the main antioxidant is any one of hindered phenol antioxidants and hindered amine antioxidants; the auxiliary antioxidant is any one of phosphite antioxidant, thioester antioxidant and thiodipropionate antioxidant.
  7. 7. The highly abrasion-resistant thermoplastic polyhydrostyryl composite of claim 1, wherein the ultraviolet absorber is one or a mixture of two of benzotriazoles, triazines, hindered amines.
  8. 8. The highly abrasion-resistant thermoplastic polyhydrostyryl composite of claim 1, wherein said lubricant is any one of silicone, alkyl silicone wax, phenyl silicone oil.
  9. 9. A method for preparing the high wear-resistant thermoplastic polyhydrostyryl composite material according to any one of claims 1 to 8, comprising the steps of: (1) Weighing the first hydrogenated styrene rubber, the thermoplastic modifier, the second hydrogenated styrene rubber, the crosslinking auxiliary agent, the vulcanizing agent, the antioxidant, the ultraviolet absorber and the lubricant according to parts by weight; (2) And (3) uniformly mixing the components, and then, delivering the mixture into an extruder for extrusion granulation to obtain the composite material.
  10. 10. The method for preparing a highly abrasion-resistant thermoplastic polyhydrostyryl composite according to claim 9, wherein the temperature of the extruder heating zone from the feed opening to the head is set as follows: 120~150°C、200~230°C、200~220°C、190~220°C、180~220°C、180~200°C、170~190°C、170~190°C、160~180°C、140~170°C、140~170°C; The screw rotating speed of the extruder is 250-500 rpm.

Description

High-wear-resistance thermoplastic poly-hydrogenated styrene-based composite material and preparation method thereof Technical Field The invention relates to the technical field of high polymer materials, in particular to a high-wear-resistance thermoplastic poly-hydrogenated phenethyl composite material and a preparation method thereof. Background The hydrogenated styrene rubber is a triblock copolymer, in which polystyrene is used as a hard block, and conjugated diene polymers such as propylene and butadiene are used as soft blocks. The hard block polystyrene domains harden at room temperature and act as physical cross-linking points, linking the soft block polyolefin into a three-dimensional network structure. This structure makes it rubbery and flexible at normal temperature and melt processable at high temperature, however, due to its block structure characteristics, especially the high molecular weight type, it is extremely high in viscosity in the molten state and extremely poor in fluidity, and it is difficult to directly mold by conventional thermoplastic processing methods such as injection molding, extrusion, etc. In order to overcome the processing obstacle, a means which is generally adopted for a long time in the industry is to add a large amount of small molecular mineral oil such as paraffin oil (liquid paraffin), naphthene oil and the like into the hydrogenated styrene rubber as a plasticizer. The product produced in this way, although effectively reducing the melt viscosity. The material is endowed with excellent soft touch and high rebound, but the defects which are difficult to overcome are introduced. Specifically, the wear resistance of the material is seriously deteriorated. The addition of small molecular acceleration oil obviously reduces the interaction force between polymer molecular chains and the cohesive strength of the material. Under the action of external forces such as friction and scraping, plastic deformation is easier to occur on the surface of the material, adhesive abrasion and abrasive particle abrasion are generated, so that the volume abrasion (which means the capacity of the material to resist the volume loss in the abrasion process and is measured by the volume size of the material worn in unit time or unit stroke under specific conditions such as friction, impact and abrasive action) index is generally up to more than 100mm 3, and the application scenes with strict requirements on the surface durability such as automotive interior surfaces, high-frequency contact electronic equipment shells, robot anti-skid foot pads and the like cannot be met. In addition, in order to pursue high abrasion resistance, materials such as thermoplastic polyurethane elastomers have been studied. Polyurethane elastomers do have excellent abrasion resistance per se, however, they have inherent weaknesses such as poor resistance to thermal aging under moisture, yellowing under ultraviolet light irradiation, and the like, which severely restrict their application in the field of outdoor or automotive interiors and the like where long-term stable appearance and weather resistance are required. It can be seen that under the knowledge of the prior art and the conventional improvement means, the processability, high wear resistance and excellent weather resistance of the material form a difficult-to-crack contradiction. If high abrasion resistance and weather resistance are required, the processing difficulty is high, the processability is realized by adding the speed-increasing oil, the abrasion resistance is inevitably seriously damaged, and the weather resistance is insufficient by adopting materials such as abrasion-resistant polyurethane elastomer and the like. Disclosure of Invention The invention aims to provide a high wear-resistant thermoplastic poly-hydrogenated styrene-based composite material and a preparation method thereof, wherein a specific thermoplastic polymer is used for completely replacing mineral oil, and a vulcanization system is introduced to form a dynamic micro-crosslinking network, so that the obtained composite material has good processability, high wear resistance and excellent weather resistance without a small molecular plasticizer. In order to achieve the above purpose, the present invention proposes the following technical scheme: The high wear-resistant thermoplastic poly hydrogenated phenethyl composite material comprises the following components in parts by weight: 25-55 parts of first hydrogenated styrene rubber; 20-45 parts of thermoplastic modifier; 5-20 parts of second hydrogenated styrene rubber; 3-10 parts of third hydrogenated styrene rubber; 0.4-3 parts of cross-linking auxiliary agent; 1-3 parts of vulcanizing agent; 0.1-0.5 part of antioxidant; 0.1-0.5 part of ultraviolet absorber; 0.5-2 parts of lubricant; The first hydrogenated styrene rubber is a linear triblock styrene block copolymer, the molecular weight of the first hydrogenated styrene ru