SEBS elastomer composite material with strong cold resistance and preparation method thereof

Abstract

The invention relates to the technical field of sole materials, in particular to an SEBS elastomer composite material with high cold resistance and a preparation method thereof, and the SEBS elastomer composite material is prepared from the following materials in parts by weight: 100 parts of linear SEBS, 60-130 parts of plasticizer, 10-25 parts of reactive compatilizer, 0.5-2 parts of antioxidant, 10-30 parts of star-structured SEBS and 5-15 parts of nano fumed silica.

Description

Technical Field

[0001] The invention relates to the technical field of sole material formulation, and in particular to a SEBS elastomer composite material with strong cold resistance and a preparation method thereof. Background Art

[0002] Traditional shoe elastomers mainly include EVA, POE, EPDM, OBC, SEBS, etc. SEBS is a new multi-purpose thermoplastic elastomer. However, the cold resistance of SEBS currently on the market is not ideal. For this reason, some manufacturers use OBC and EPDM with relatively better cold resistance as substitutes. However, the hardness increases significantly below -15°C. In addition, OBC and EPDM are all imported and the price is more than 30% higher than SEBS. The high cost and high risk of out-of-stock are not conducive to product research and development. Summary of the Invention

[0003] Therefore, in order to solve the above problems, the present invention provides a SEBS elastomer composite material with strong cold resistance and a preparation method thereof.

[0004] To achieve the above objectives, the technical solution of the present invention is to provide a SEBS elastomer composite material with strong cold resistance, comprising the following materials in parts by weight: 100 parts of linear SEBS, 60-130 parts of plasticizer, 10-25 parts of reactive compatibilizer, 0.5-2 parts of antioxidant, 10-30 parts of star-structured SEBS, and 5-15 parts of nano-fumed silica.

[0005] A further improvement is that the reactive compatibilizer is maleic anhydride grafted SEBS.

[0006] A further improvement is that the plasticizer is a polyether ester plasticizer, and the molecular weight of the polyether ester plasticizer is 2000-6000 g / mol.

[0007] A further improvement is that it also includes 0.5-5 parts of a branched structure promoter.

[0008] A further improvement is that the branched structure promoter is pentaerythritol, trimesic acid or trimethylolpropane triacrylate.

[0009] A further improvement is that the surface of the nano-fumed silica is modified and the specific surface area of the nano-fumed silica is 180-250 m² / g.

[0010] A method for preparing a SEBS elastomer composite material with strong cold resistance comprises the following steps: S1 premixing: uniformly mix linear SEBS, star-shaped SEBS and maleic anhydride grafted SEBS according to the proportion; S2 plasticization: add polyether ester plasticizer and stir to penetrate for 30 minutes; S3 enhancement: Add nano-fumed silica and antioxidant for high-speed dispersion; S4 melt blending: melt blending is carried out at 160°C - 220°C.

[0011] S5 extrusion granulation: the melt blended material is extruded, cooled, and pelletized to obtain composite material pellets A further improvement is that the temperature during premixing is 60-80°C.

[0012] A further improvement is that the melt blending is carried out in a twin-screw extruder, and the screw speed is 200-400 rpm.

[0013] The advantages and beneficial effects of the present invention are: 1. Compared with mineral oil plasticized SEBS, it has excellent cold resistance, maintains excellent flexibility and elasticity at extremely low temperatures (such as -40℃, -50℃), is not easy to break, and has greatly improved impact strength at low temperatures (such as -30℃ or lower).

[0014] 2. Through the inherent low migration of high molecular weight polyester plasticizers and the strong anchoring effect of reactive compatibilizers, the migration and exudation of plasticizers are fundamentally suppressed. After long-term use or in high temperature environments (such as after aging at 70-100°C), there is no oily substance exuding from the surface of the material, it is non-sticky and does not contaminate contact objects. The stability of the material's hardness, low-temperature performance, etc. over time and environmental changes is significantly improved.

[0015] 3. Excellent durability. Combined with low migration and good antioxidant system, the material has a longer service life and is particularly suitable for applications with high requirements for low temperature performance and long-term stability. Low migration also reduces the risk of environmental pollution. DETAILED DESCRIPTION

[0016] The following examples are only used to illustrate the technical solution of the present invention more clearly, and are not intended to limit the scope of protection of the present invention. Example 1

[0017] A SEBS elastomer composite material with strong cold resistance comprises the following materials in parts by weight: 100 parts of linear SEBS, 60-130 parts of plasticizer, 10-25 parts of reactive compatibilizer, 0.5-2 parts of antioxidant, 10-30 parts of star-shaped structured SEBS, and 5-15 parts of nano-fumed silica.

[0018] In order to ensure that the plasticizer can be stably combined with the linear SEBS, the reactive compatibilizer is maleic anhydride grafted SEBS.

[0019] In order to inhibit migration and exudation, provide long-term stable plasticizing effect, and inhibit low-temperature crystallization, the plasticizer is a polyether ester plasticizer, and the molecular weight of the polyether ester plasticizer is 2000-6000 g / mol.

[0020] In order to improve the plasticizing efficiency and assist in inhibiting migration, the invention further comprises: 0.5-5 parts of a branched structure promoter, wherein the branched structure promoter is pentaerythritol, trimesic acid or trimethylolpropane triacrylate.

[0021] In order to enhance the friction of the composite material on low-temperature wet and slippery ground, the surface of the nano-fumed silica is modified, and the specific surface area of the nano-fumed silica is 180-250m² / g; The surface of nano-fumed silica was treated with silane coupling agent KH-570.

[0022] A method for preparing a SEBS elastomer composite material with strong cold resistance comprises the following steps: S1 premixing: uniformly mix linear SEBS, star-shaped SEBS and maleic anhydride grafted SEBS according to the proportion; S2 plasticization: add polyether ester plasticizer and stir to penetrate for 30 minutes; S3 enhancement: Add nano-fumed silica and antioxidant for high-speed dispersion; S4 melt blending: melt blending is carried out at 160°C - 220°C.

[0023] S5 extrusion granulation: the melt blended material is extruded, cooled, and pelletized to obtain composite material pellets In order to enhance the efficiency of premixing, the premixing temperature is 60-80℃.

[0024] The melt blending is carried out in a twin-screw extruder, and the screw speed is 200-400 rpm.

[0025] Comparative experiment: C1: Mineral oil instead of polyether ester, C2: No star-shaped SEBS added, C3: No surface-treated SiO2.

[0026]

[0027] From the data in the table, it can be concluded that compared with C1, the material of Example 1 has better low-temperature resistance and can be used at more extreme temperatures; Compared with C2, it has better deformation resistance and strong wear resistance at low temperatures; Compared with C3, it has a superior coefficient of friction on ice; In summary, this material has stronger performance and longer service life than ordinary SEBS materials at low temperatures, and is feasible as a low-temperature sole substrate or auxiliary modified material.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A SEBS elastomer composite material with strong cold resistance, characterized by: The invention comprises the following materials in parts by weight: 100 parts of linear SEBS, 60-130 parts of plasticizer, 10-25 parts of reactive compatibilizer, 0.5-2 parts of antioxidant, 10-30 parts of star-shaped structured SEBS, and 5-15 parts of nano-fumed silica.

2. The SEBS elastomer composite material with strong cold resistance according to claim 1, characterized in that: The reactive compatibilizer is maleic anhydride grafted SEBS.

3. The SEBS elastomer composite material with strong cold resistance according to claim 1, characterized in that: The plasticizer is a polyether ester plasticizer, and the molecular weight of the polyether ester plasticizer is 2000-6000 g / mol.

4. The SEBS elastomer composite material with strong cold resistance according to claim 1, characterized in that: Also includes: 0.5 - 5 parts of branched structure promoter.

5. The SEBS elastomer composite material with strong cold resistance according to claim 4, characterized in that: The branched structure promoter is pentaerythritol, trimesic acid or trimethylolpropane triacrylate.

6. The SEBS elastomer composite material with strong cold resistance according to claim 1, characterized in that: The surface of the nano-fumed silica is modified, and the specific surface area of the nano-fumed silica is 180-250 m² / g.

7. A method for preparing a SEBS elastomer composite material with strong cold resistance, characterized by: The steps include: S1 premixing: uniformly mix linear SEBS, star-shaped SEBS and maleic anhydride grafted SEBS according to the proportion; S2 plasticization: add polyether ester plasticizer and stir to penetrate for 30 minutes; S3 enhancement: Add nano-fumed silica and antioxidant for high-speed dispersion; S4 melt blending: melt blending at 160°C - 220°C; S5 extrusion granulation: the melt-blended material is extruded, cooled, and pelletized to obtain composite material pellets.

8. The method for preparing a SEBS elastomer composite material according to claim 1, characterized in that: The premixing temperature is 60-80°C.

9. The method for preparing a SEBS elastomer composite material according to claim 1, characterized in that: The melt blending is carried out in a twin-screw extruder, and the screw speed is 200-400 rpm.

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