Low-heat-absorption elastomer material and preparation method thereof

Abstract

The invention relates to a low-heat-absorption elastomer material and a preparation method thereof. The low-heat-absorption elastomer material is prepared from the following components in parts by mass: 100 to 120 parts of hydrogenated styrene-ethylene / butylene-styrene block copolymer, 50 to 100 parts of white oil, 50 to 100 parts of polypropylene, 5 to 10 parts of auxiliaries, 12 to 16 parts of composite hollow microspheres and 7 to 11 parts of anti-ultraviolet reagent, raw materials of the composite hollow microspheres comprise hollow glass microspheres, modified aluminum oxide and a silane coupling agent. The method has the effect of reducing the heat absorption performance of the elastomer material.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of elastomers, in particular to a low heat absorption elastomer material and a preparation method thereof. BACKGROUND

[0002] Elastomers are a class of high molecular materials with high elasticity at room temperature, which become indispensable materials in modern industry due to their unique molecular structure and high elasticity characteristics. From traditional rubber to new thermoplastic elastomers, their applications cover multiple fields from daily necessities to high-end technology.

[0003] Elastomers are often applied to fields used outdoors, such as handlebar covers, luggage handles, etc. Under the open outdoor environment, the elastomer products will also be affected by the rising temperature, affecting the use of the products. SUMMARY

[0004] In order to further improve the heat absorption performance of the elastomer, the present application provides a low heat absorption elastomer material and a preparation method thereof.

[0005] In a first aspect, the present application provides a low heat absorption elastomer material, which adopts the following technical solution: A low heat absorption elastomer material includes the following components by mass fraction: 100-120 parts of hydrogenated styrene-ethylene / butylene-styrene block copolymer, 50-100 parts of white oil, 50-100 parts of polypropylene, 5-10 parts of auxiliary agent, 12-16 parts of composite hollow microspheres, and 7-11 parts of anti-ultraviolet agent; The raw material of the composite hollow microspheres includes hollow glass microspheres, modified alumina, and silane coupling agent.

[0006] By adopting the above technical solution, the composite hollow microspheres and the anti-ultraviolet agent are added to the system, which can effectively improve the heat absorption performance and anti-ultraviolet performance of the elastomer as a whole. The composite hollow microspheres are prepared by hollow glass microspheres, modified alumina, and silane coupling agent. The addition of hollow glass microspheres can form a closed hollow structure of the elastomer, thereby reducing the thermal radiation conductivity and effectively improving the temperature rising performance of the system. Alumina is a light-colored inorganic pigment, which can effectively reduce the absorption of sunlight by the elastomer, thereby further improving the heat absorption performance of the system. The hollow glass microspheres and the modified alumina are combined by the silane coupling agent, which further improves the stability of the system as a whole, so as to synergistically improve the heat absorption performance of the elastomer material.

[0007] As a preferred, the composite hollow microspheres are prepared by the following method: The hollow glass microbeads are mixed with a sodium hydroxide solution, stirred after being heated, washed after being cooled, and dried to obtain pretreated hollow glass microbeads; the pretreated hollow glass microbeads are mixed with modified alumina, added to anhydrous ethanol to obtain a composite dispersion liquid, a silane coupling agent dispersion liquid is obtained by mixing KH550 with water and magnetically stirring, the silane coupling agent dispersion liquid is added to the composite dispersion liquid, stirred after being heated, washed, filtered, and dried to obtain composite hollow microspheres.

[0008] By using the above technical solution, the alumina is combined with the hollow glass microbeads by using the silane coupling agent as a bridge, the silane coupling agent is grafted to the surface of the hollow glass microbeads, the surface of the modified alumina also contains hydroxyl groups, which can react with the other two hydroxyl groups on the silicon alcohol, so that the modified alumina is combined with the hollow glass microbeads together to form a stable compatible structure, and the compatibility between the elastomer is improved, which is uniformly dispersed in the system, and the overall heat absorption performance of the system is further improved.

[0009] Preferably, the mass ratio between the hollow glass microbeads, the silane coupling agent, and the alumina is 8:(0.24-0.26):1.

[0010] By using the above technical solution, the mass ratio between the hollow glass microbeads, the silane coupling agent, and the modified alumina is within the above range, which can effectively improve the overall stability of the prepared composite hollow microspheres.

[0011] Preferably, the modified alumina raw material includes boehmite, n-pentanoic acid, and n-octane.

[0012] By using the above technical solution, boehmite is used as a raw material, n-pentanoic acid is used as a surface modifier, and n-octane is used as an oily solvent to prepare alumina with uniform particle size, which can make the alumina more uniformly dispersed in the system, thereby improving the overall stability of the composite hollow microspheres.

[0013] Preferably, the modified alumina is prepared by the following method: The boehmite is dispersed in ethanol to obtain a boehmite dispersion liquid, n-pentanoic acid and n-octane are added to the boehmite dispersion liquid, and an emulsion is obtained after stirring, the emulsion is added to ammonia water to obtain a precipitate, which is dried and calcined to obtain modified alumina.

[0014] By using the above technical solution, the boehmite particles compounded by n-pentanoic acid are uniformly dispersed and can be coated by n-octane to form a uniform and stable emulsion. After the emulsion is combined with ammonia water, an aluminum gel precipitate is formed, which is calcined to obtain modified alumina, reducing the defects of the alumina, making the alumina uniformly dispersed in the system, and effectively improving the compatibility. The alumina can be further stably combined with the hollow glass microbeads, thereby improving the overall stability of the composite hollow microspheres.

[0015] Preferably, the mass ratio between the boehmite and n-valeric acid is 1:(0.75-0.85).

[0016] By adopting the above technical solution, the stability of the modified alumina prepared as a whole can be further improved by preferably selecting the mass ratio between the boehmite and n-valeric acid within the above range.

[0017] Preferably, the anti-ultraviolet agent comprises titanium dioxide and dopamine.

[0018] By adopting the above technical solution, titanium dioxide is an inorganic material with excellent performance and good optical characteristics, which can absorb ultraviolet light and thus has good anti-ultraviolet performance, and can improve the overall heat resistance and reduce the ultraviolet aging of the elastomer in an external light environment. In addition, titanium dioxide is also a light-colored inorganic substance that can synergistically reduce the heat absorption performance of the system. After the modification of titanium dioxide by dopamine, the dispersion performance of titanium dioxide in the system is further improved, thereby improving the stability of the anti-ultraviolet agent in the system.

[0019] Preferably, the anti-ultraviolet agent is prepared by the following method: Titanium tetrabutoxide and dichloromethane are mixed, and a titanium tetrabutoxide dispersion is obtained after magnetic stirring. Hydrogen chloride and dopamine hydrochloride are added to the titanium tetrabutoxide dispersion, stirred, and then hydrogen peroxide is added to obtain a mixture. The mixture is heated and reacted in a reaction kettle, cooled, filtered and washed, and dried to obtain the anti-ultraviolet agent.

[0020] By adopting the above technical solution, a mixed sol precursor is prepared by using titanium tetrabutoxide and dopamine hydrochloride as raw materials, and the anti-ultraviolet agent is prepared by a hydrothermal method. Dopamine is compounded with titanium dioxide in the form of coating, which effectively improves the ultraviolet absorption performance of the anti-ultraviolet agent and further improves the compatibility of the anti-ultraviolet agent in the system, and the anti-ultraviolet agent is uniformly dispersed in the elastomer, thereby improving the overall stability of the system.

[0021] Preferably, the mass ratio between the titanium tetrabutoxide and dopamine hydrochloride is 1:(0.05-0.07).

[0022] By adopting the above technical solution, the stability of the anti-ultraviolet agent prepared as a whole can be effectively improved by preferably selecting the mass ratio between the titanium tetrabutoxide and dopamine hydrochloride within the above range.

[0023] In a second aspect, the application provides a preparation method of a low-heat-absorption elastomer material, which adopts the following technical solution: A preparation method of a low-heat-absorption elastomer material, comprising the following steps: The hydrogenated styrene-ethylene / butylene-styrene block copolymer, white oil, polypropylene, auxiliary agent, composite hollow microspheres and anti-ultraviolet agent are mixed and then put into a high-speed mixer to mix uniformly, and then added to the feeding system of a twin-screw extruder for melt extrusion and granulation. After extrusion, a low-heat-absorbing elastomer is obtained.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The composite hollow microspheres and anti-ultraviolet agent are added to the elastomer to improve the heat absorption performance of the elastomer. The composite hollow microspheres can form a closed hollow structure by combining hollow glass microspheres and modified alumina, thereby effectively reducing heat radiation conduction and improving the heating performance of the system. The modified alumina is a light-colored inorganic filler that can effectively reduce the absorption of sunlight by the elastomer, thereby further improving the overall heat absorption performance of the system. The combination of hollow glass microspheres and modified alumina through a silane coupling agent can further improve the stability and dispersion performance of the system. 2. The modified alumina is prepared by calcining boehmite as raw material, n-pentanoic acid as surface modifier, and n-octane as oil solvent. The modified alumina has uniform particle size, and the alumina prepared by using n-pentanoic acid as surface modifier can be dispersed more uniformly in the system, thereby further improving the overall stability of the system. 3. Titanium dioxide has the performance of absorbing ultraviolet light and is also a light-colored inorganic filler that can effectively improve the heat absorption performance of the elastomer. Using tetrabutyl titanate as raw material and adding dopamine hydrochloride paste, dopamine is coated on the surface of titanium dioxide, which can effectively improve the dispersion performance of titanium dioxide and improve the absorption performance of titanium dioxide to ultraviolet light. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the following examples: Raw material description: All raw materials in the examples can be obtained through market purchase; among them, the auxiliary agent is calcium carbonate.

[0026] Example 1 Preparation of anti-ultraviolet agent: Mix 80 g of tetrabutyl titanate (CAS No.: 5593-70-4) with 300 g of dichloromethane (CAS No.: 75-09-2), and after magnetic stirring, a tetrabutyl titanate dispersion liquid is obtained. Add 600 g of hydrogen chloride and 4 g of dopamine hydrochloride (CAS No.: 62-31-7) to the tetrabutyl titanate dispersion liquid, and after stirring at a speed of 150 rpm for 5 min, add 20 g of hydrogen peroxide to obtain a mixture. Transfer the mixture to a polytetrafluoroethylene hydrothermal reactor, seal it, and react in a temperature box at 170°C for 3 h. After the reaction, naturally cool to 25°C, then filter the product, wash with ethanol, and dry in a vacuum drying oven at 60°C for 12 h. After grinding, an anti-ultraviolet reagent is obtained.

[0027] Preparation of modified alumina: Disperse 4.5 g of boehmite (CAS No.: 1318-23-6) in 1500 g of ethanol to obtain a boehmite dispersion liquid. Add 3.375 g of n-pentanoic acid (CAS No.: 109-52-4) and 200 g of n-octane (CAS No.: 111-65-9) to the boehmite dispersion liquid, and after stirring, an emulsion is obtained. Add the emulsion to ammonia water to obtain a precipitate, dry at a temperature of 60°C for 12 h, and then calcine at a temperature of 900°C for 6 h to obtain modified alumina.

[0028] Preparation of composite hollow microspheres: Add hollow glass microbeads (CAS No.: 65997-17-3) to a sodium hydroxide solution, stir at a temperature of 80°C for 1 h, then naturally cool to 25°C. After washing with deionized water, dry at an environment of 100°C for 2 h to obtain pretreated hollow glass microbeads. Mix 21.69 g of pretreated hollow glass microbeads with 2.71 g of modified alumina, and ultrasonically disperse in 500 g of anhydrous ethanol for 2 h to obtain a composite dispersion liquid. Mix 0.6 g of KH550 (CAS No.: 919-30-2) with 100 g of deionized water, then add glacial acetic acid to adjust the system to be acidic, and magnetically stir for 10 min to obtain a silane coupling agent dispersion liquid. Add the silane coupling agent dispersion liquid to the composite dispersion liquid, and after heating to 80°C, stir and react. After the reaction, wash and filter with anhydrous ethanol, and dry at an environment of 100°C for 2 h. After grinding, composite hollow microspheres are obtained.

[0029] Preparation of low-heat-absorbing elastomer: After 100 g of hydrogenated styrene-ethylene / butylene-styrene block copolymer (CAS No.: 66070-58-4), 50 g of white oil (CAS No.: 8042-47-5), 50 g of polypropylene (CAS No.: 9003-07-0), 5 g of adjuvant, 12 g of composite hollow microspheres and 7 g of anti-ultraviolet agent are mixed and uniformly mixed in a high-speed mixer, then added to the feeding system of a twin-screw extruder for melt extrusion and granulation, the main machine speed is set to 400 r / min, the temperature of zone 1 is 185°C, the temperature of zone 2 is 190°C, and the temperature of zone 3 is 200°C. After extrusion, a low-heat-absorbing elastomer is obtained.

[0030] Example 2 Preparation of anti-ultraviolet agent: After 80 g of tetrabutyl titanate is mixed with 300 g of dichloromethane, a tetrabutyl titanate dispersion is obtained after magnetic stirring. 600 g of hydrogen chloride and 5.6 g of dopamine hydrochloride are added to the tetrabutyl titanate dispersion, stirred at a speed of 150 rpm for 5 min, then 20 g of hydrogen peroxide is added to obtain a mixture. The mixture is transferred to a polytetrafluoroethylene hydrothermal reaction kettle, sealed and reacted in a 170°C temperature box for 3h. After the reaction, it is naturally cooled to 25°C, then the product is filtered, washed with ethanol and dried in a vacuum drying oven at 60°C for 12h. After grinding, the anti-ultraviolet agent is obtained.

[0031] Preparation of modified alumina: 4.5 g of boehmite is dispersed in 1500 g of ethanol to obtain a boehmite dispersion. 3.375 g of n-pentanoic acid and 200 g of n-octane are added to the boehmite dispersion to obtain an emulsion. The emulsion is added to ammonia water to obtain a precipitate, which is dried at a temperature of 60°C for 12h, then calcined at a temperature of 900°C for 6h to obtain modified alumina.

[0032] Preparation of composite hollow microspheres: Hollow glass microspheres are added to a sodium hydroxide solution, stirred at a temperature of 80°C for 1h, then naturally cooled to 25°C. After washing with deionized water, the pretreated hollow glass microspheres are dried at 100°C for 2h. 21.6 g of pretreated hollow glass microspheres are mixed with 2.7 g of modified alumina and ultrasonically dispersed in 500 g of anhydrous ethanol for 2h to obtain a composite dispersion. 0.7 g of KH550 is mixed with 100 g of deionized water, then ice acetic acid is added to adjust the system to be acidic, and magnetic stirring is performed for 10 min to obtain a silane coupling agent dispersion. The silane coupling agent dispersion is added to the composite dispersion, heated to 80°C and stirred to react. After the reaction, the product is washed with anhydrous ethanol and filtered, dried at 100°C for 2h, and ground to obtain composite hollow microspheres.

[0033] Preparation of low heat-absorbing elastomer: After 120 g of hydrogenated styrene-ethylene / butylene-styrene block copolymer, 100 g of white oil, 100 g of polypropylene, 10 g of auxiliary agent, 16 g of composite hollow microspheres and 11 g of anti-ultraviolet agent are mixed and uniformly mixed in a high-speed mixer, they are then added to the feeding system of a twin-screw extruder for melt extrusion and granulation. The main machine speed is set to 400 r / min, the temperature of zone 1 is 185℃, the temperature of zone 2 is 190℃, and the temperature of zone 3 is 200℃. After extrusion, a low heat-absorbing elastomer is obtained.

[0034] Example 3 Preparation of anti-ultraviolet agent: After 80 g of tetrabutyl titanate is mixed with 300 g of dichloromethane, a tetrabutyl titanate dispersion is obtained after magnetic stirring. 600 g of hydrogen chloride and 4.8 g of dopamine hydrochloride are added to the tetrabutyl titanate dispersion. After stirring at a speed of 150 rpm for 5 min, 20 g of hydrogen peroxide is added to obtain a mixture. The mixture is transferred to a polytetrafluoroethylene hydrothermal reaction kettle, sealed and reacted in a 170℃ temperature box for 3 h. After the reaction, it is naturally cooled to 25℃, then the product is filtered, washed with ethanol and dried in a 60℃ vacuum drying oven for 12 h. After grinding, an anti-ultraviolet agent is obtained.

[0035] Preparation of modified alumina: 4.5 g of boehmite is dispersed in 1500 g of ethanol to obtain a boehmite dispersion. 3.375 g of n-pentanoic acid and 200 g of n-octane are added to the boehmite dispersion to obtain an emulsion after stirring. The emulsion is added to ammonia water to obtain a precipitate, which is dried at a temperature of 60℃ for 12 h and then calcined at a temperature of 900℃ for 6 h to obtain modified alumina.

[0036] Preparation of composite hollow microspheres: Hollow glass microbeads are added to a sodium hydroxide solution, stirred at a temperature of 80℃ for 1 h, then naturally cooled to 25℃, washed with deionized water and dried at 100℃ for 2 h to obtain pretreated hollow glass microbeads. 21.64 g of pretreated hollow glass microbeads and 2.71 g of modified alumina are mixed and ultrasonically dispersed in 500 g of anhydrous ethanol for 2 h to obtain a composite dispersion. 0.65 g of KH550 is mixed with 100 g of deionized water, then glacial acetic acid is added to adjust the system to be acidic, and magnetic stirring is performed for 10 min to obtain a silane coupling agent dispersion. The silane coupling agent dispersion is added to the composite dispersion, heated to 80℃ and stirred to react. After the reaction, it is washed and filtered with anhydrous ethanol and dried at 100℃ for 2 h. After grinding, composite hollow microspheres are obtained.

[0037] Preparation of low heat-absorbing elastomer: 110 g of hydrogenated styrene-ethylene / butylene-styrene block copolymer, 75 g of white oil, 75 g of polypropylene, 7 g of auxiliary agent, 14 g of composite hollow microspheres and 9 g of anti-ultraviolet agent were mixed and uniformly mixed in a high-speed mixer, and then added to the feeding system of a twin-screw extruder for melt extrusion and granulation. The main machine speed was set to 400 r / min, the temperature of zone 1 was 185℃, the temperature of zone 2 was 190℃, and the temperature of zone 3 was 200℃. After extrusion, a low-heat-absorption elastomer was obtained.

[0038] Example 4 Example 4 was based on Example 3. In Example 4, 3.2 g of dopamine hydrochloride was used in the preparation of the anti-ultraviolet agent.

[0039] Example 5 Example 5 was based on Example 3. In Example 5, 6.4 g of dopamine hydrochloride was used in the preparation of the anti-ultraviolet agent.

[0040] Example 6 Example 6 was based on Example 3. In Example 6, 2.925 g of n-pentanoic acid was used in the preparation of the modified alumina.

[0041] Example 7 Example 7 was based on Example 3. In Example 7, 4.275 g of n-pentanoic acid was used in the preparation of the modified alumina.

[0042] Example 8 Example 8 was based on Example 3. In Example 8, 21.79 g of hollow glass microbeads, 0.49 g of silane coupling agent and 2.72 g of modified alumina were used in the preparation of the composite hollow microspheres.

[0043] Example 9 Example 9 was based on Example 3. In Example 9, 21.5 g of hollow glass microbeads, 0.81 g of silane coupling agent and 2.69 g of modified alumina were used in the preparation of the composite hollow microspheres.

[0044] Example 10 Example 10 was based on Example 3. In Example 10, the modified alumina was replaced by ordinary nano-alumina in the preparation of the composite hollow microspheres.

[0045] Example 11 Example 11 was based on Example 3. In Example 11, no dopamine hydrochloride was added in the preparation of the anti-ultraviolet agent.

[0046] Comparative Example 1 The comparative example 1 is based on the example 3, and in the comparative example 1, the hollow glass beads are physically mixed with the modified alumina to prepare the composite hollow microspheres.

[0047] Comparative example 2 The comparative example 2 is based on the example 3, and in the comparative example 2, the composite hollow microspheres are replaced by the common hollow glass beads.

[0048] Comparative example 3 The comparative example 3 is based on the example 3, and in the comparative example 3, the composite hollow microspheres are replaced by the modified alumina.

[0049] Performance test The samples of the examples 1-11 and the comparative examples 1-3 are sampled and the following performance tests are conducted. The thermal conductivity of the samples is tested by using a thermal conductivity instrument, and each sample is tested for 3 times, and the average value is taken, and the test results are filled in Table 1.

[0050] The sample with an initial temperature of 20℃ is irradiated under a UV ultraviolet lamp (40W) at a distance of 50mm for 3h, and then the temperature of the sample after irradiation is measured, and the temperature rise value (△T) of the sample is calculated, and each sample is tested for 3 times, and the average value is taken, and the test results are filled in Table 1.

[0051] The tensile strength of the sample before and after ultraviolet irradiation is detected respectively, and each sample is tested for 3 times, and the average value is taken, and the test results are filled in Table 1.

[0052] Performance test detection results of the examples 1-11 and the comparative examples 1-3 It can be seen from Table 1 that the thermal stability of the examples 1-3 is all in the thermal conductivity of 0.25W / (m·K) and below, which indicates that the elastomer material prepared by the application has good thermal stability; the tensile strength of the examples 1-3 after ultraviolet aging is all above 10MPa, which indicates that the elastomer material prepared by the application has good ultraviolet resistance.

[0053] In the examples 4 and 5, the mass ratio between the dopamine hydrochloride and the tetrabutyl titanate in preparing the ultraviolet resistant agent is not within the range defined by the application, when the amount of the dopamine hydrochloride is too small, it is difficult to further improve the dispersibility of the titanium dioxide in the system, so that the stability of the elastomer as a whole is affected; when the content of the dopamine hydrochloride is too much, the generated titanium dioxide particles will be further connected, the particle size is too large, and the agglomerates are formed, which affects the dispersibility and stability of the system as a whole, so the performance of the examples 4 and 5 is decreased.

[0054] The mass ratio between boehmite and n-pentanoic acid in the preparation of modified alumina in Example 6 and Example 7 is not within the range defined in the present application. When the content of n-pentanoic acid is too low, it is difficult for the pentanoate to further adsorb on the boehmite particles to form electrostatic stability, and it is difficult to improve the stability of the modified alumina prepared, and the modified alumina agglomerates in the system. When the content of n-pentanoic acid is too high, the n-pentanoic acid is too thick on the surface of boehmite, and it is difficult to combine with hollow glass microspheres in the subsequent step, which affects the thermal stability and ultraviolet resistance of the system. Therefore, the performance of Example 6 and Example 7 has declined.

[0055] The mass ratio between hollow glass microspheres, silane coupling agent and modified alumina in the preparation of composite hollow glass microspheres in Example 8 and Example 9 is not within the range defined in the present application. When the content of silane coupling agent is too low, the modification effect on the surface of hollow glass microspheres decreases, on the one hand, the dispersibility of hollow glass microspheres in the system decreases, which affects the stability of the system, on the other hand, it is difficult to stably connect the hollow glass microspheres and the modified alumina, and it is difficult to further improve the performance of the system; when the content of silane coupling agent is too high, the viscosity of the system is too large, and it is also difficult to stably connect the hollow glass microspheres and the modified alumina, so the performance of Example 8 and Example 9 has declined.

[0056] Example 10 replaces the modified alumina with ordinary nano-alumina. The dispersibility of the unmodified ordinary alumina is difficult to further improve, and the compatibility in the system also decreases, which affects the overall performance of the system, so the performance of Example 10 has declined.

[0057] In Example 11, the anti-ultraviolet agent is ordinary titanium dioxide, which is difficult to further improve the ultraviolet absorption effect of the anti-ultraviolet agent, and at the same time, the dispersibility in the system also decreases, which affects the stability of the system, so the performance of Example 11 has declined.

[0058] The composite hollow glass microspheres of Comparative Example 1 are only physically mixed with hollow glass microspheres and modified alumina, and the components of ordinary physical mixing are difficult to further improve the connection strength and stability, and it is difficult to further improve the heat absorption performance and anti-ultraviolet performance of the overall synergistic system, so the performance of Comparative Example 1 has declined.

[0059] Comparative Example 2 replaces the hollow composite glass microspheres with ordinary hollow glass microspheres, and only ordinary hollow glass microspheres are difficult to further improve the heat absorption performance and anti-ultraviolet performance of the overall system.

[0060] In Comparative Example 3, the composite hollow microspheres are replaced by modified alumina, and the system without adding hollow glass microspheres is difficult to form a closed hollow structure, and the heat radiation conduction is difficult to further reduce.

[0061] The embodiments are only illustrative of the present application, and are not intended to limit the present application. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A low heat absorption elastomer material, characterized by: The composition includes the following parts by mass: 100-120 parts of hydrogenated styrene-ethylene / butylene-styrene block copolymer, 50-100 parts of white oil, 50-100 parts of polypropylene, 5-10 parts of additives, 12-16 parts of composite hollow microspheres, and 7-11 parts of anti-ultraviolet agent; The composite hollow microsphere raw materials include hollow glass microspheres, modified alumina and a silane coupling agent.

2. The low heat absorption elastomer material according to claim 1, characterized in that: The composite hollow microspheres are prepared by the following method: The hollow glass microspheres are mixed with a sodium hydroxide solution, heated and stirred, cooled and washed, and dried to obtain pretreated hollow glass microspheres; the pretreated hollow glass microspheres are mixed with modified alumina, added to anhydrous ethanol for ultrasonic dispersion to obtain a composite dispersion; KH550 is mixed with water, magnetically stirred to obtain a silane coupling agent dispersion; the silane coupling agent dispersion is added to the composite dispersion, heated and stirred to react, washed, filtered, and dried to obtain composite hollow microspheres.

3. The low heat absorption elastomer material according to claim 2, characterized in that: The mass ratio of the hollow glass microspheres, the silane coupling agent and the aluminum oxide is 8:(0.24-0.26):

1.

4. The low heat absorption elastomer material according to claim 1, characterized in that: The modified alumina raw materials include boehmite, n-valeric acid and n-octane.

5. The low heat absorption elastomer material according to claim 4, characterized in that: The modified alumina is prepared by the following method: Boehmite is dispersed in ethanol to obtain a boehmite dispersion, n-valeric acid and n-octane are added to the boehmite dispersion, and stirred to obtain an emulsion, which is added to aqueous ammonia to obtain a precipitate, which is dried and calcined to obtain modified alumina.

6. The low heat absorption elastomer material according to claim 5, characterized in that: The mass ratio between the boehmite and n-valeric acid is 1:(0.75-0.85).

7. The low heat absorption elastomer material according to claim 1, characterized in that: The anti-ultraviolet agent includes titanium dioxide and dopamine.

8. The low heat absorption elastomer material according to claim 7, characterized in that: The anti-ultraviolet agent is prepared by the following method: Tetrabutyl titanate and dichloromethane are mixed and magnetically stirred to obtain a tetrabutyl titanate dispersion. Hydrogen chloride and dopamine hydrochloride are added to the tetrabutyl titanate dispersion, stirred, and then hydrogen peroxide is added to obtain a mixture. The mixture is heated in a reactor for reaction, cooled, filtered, washed, and dried to obtain an anti-ultraviolet agent.

9. The low heat absorption elastomer material according to claim 8, characterized in that: The mass ratio between the tetrabutyl titanate and dopamine hydrochloride is 1:(0.05-0.07).

10. A method for preparing a low heat absorption elastomer material according to any one of claims 1 to 9, characterized in that: The steps include: The hydrogenated styrene-ethylene / butylene-styrene block copolymer, white oil, polypropylene, additives, composite hollow microspheres and anti-ultraviolet agent are mixed, placed in a high-speed mixer and mixed evenly, and then added to the feeding system of a twin-screw extruder for melt extrusion granulation to obtain a low heat absorption elastomer after extrusion.

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