Anti-yellowing environment-friendly composite additive for light-colored rubber products

Abstract

The present application relates to rubber processing aid technical field, propose a kind of light-colored rubber product with the environmental protection composite aid of yellowing resistance, including the following weight parts of component: hindered phenol main antioxidant 0.5~1 part, thioester auxiliary antioxidant 1~5 parts, light stabilizer 1~5 parts, antioxidant 30~40 parts, zinc-free vulcanization active agent 30~40 parts.By the above technical scheme, the problems such as not resistant to yellowing, easy aging and frost spraying of the rubber product prepared by rubber aid in the related art are solved.

Description

Technical Field

[0001] This invention relates to the field of rubber processing aids technology, specifically to a yellowing-resistant and environmentally friendly composite additive for light-colored rubber products. Background Technology

[0002] Light-colored, white, and colored rubber products have a wide range of applications, covering hoses, rubber seals, building sealing strips, daily-use rubber products, medical supplies, and many other fields. These products have extremely high requirements for appearance stability, weather resistance, and environmental safety. In actual production applications, although traditional single aromatic amine and quinoline antioxidants can play a certain role in anti-aging, these antioxidants are very likely to cause discoloration, reddening, and graying of rubber products, causing pollution and affecting the appearance quality and commercial value of the products, making them unsuitable for the use of light-colored rubber products. Single phenolic antioxidants have limited heat and oxygen aging resistance, insufficient ozone resistance, and poor compatibility with the rubber matrix, easily causing blooming, migration, and precipitation during use, thus affecting the overall performance and service life of the rubber products. In conventional vulcanization systems, zinc oxide is often used as an activator, but zinc ions can easily cause yellowing and discoloration of light-colored rubber products during long-term use or high-temperature aging. At the same time, the presence of zinc salts makes it difficult to meet the environmental requirements for light-colored, white, and colored rubber products to be free of heavy metals. In addition, the types of additives required in the production of rubber products are numerous and complex. In the batching process, misweighing or omissions are prone to occur, which not only fails to meet production requirements but also wastes manpower and resources, leading to a decrease in production efficiency.

[0003] Therefore, there is currently a lack of a special composite additive for light-colored rubber that can combine the advantages of aging resistance, good dispersibility, easy operation, zinc-free and environmentally friendly properties. Summary of the Invention

[0004] This invention proposes an environmentally friendly composite additive for light-colored rubber products that is resistant to yellowing, in order to solve or alleviate at least one of the above-mentioned problems.

[0005] The technical solution of the present invention is as follows: This invention proposes an environmentally friendly composite additive for light-colored rubber products that is resistant to yellowing, comprising the following components in parts by weight: 0.5-1 parts hindered phenolic primary antioxidant, 1-5 parts thioester auxiliary antioxidant, 1-5 parts light stabilizer, 30-40 parts antioxidant, and 30-40 parts zinc-free vulcanizing activator.

[0006] Preferably, the components further include at least one of a dispersant, a plasticizer, an inorganic filler, and a protective wax.

[0007] Preferably, the light-colored rubber product anti-yellowing environmentally friendly composite additive comprises the following components in parts by weight: 0.5-1 parts hindered phenolic primary antioxidant, 1-5 parts thioester auxiliary antioxidant, 1-5 parts light stabilizer, 30-40 parts antioxidant, 30-40 parts zinc-free vulcanizing activator, 5-10 parts dispersant, 11-23 parts plasticizer, 5-10 parts inorganic filler, and 10-16 parts protective wax.

[0008] Preferably, the plasticizer comprises at least one of paraffin oil and polyisobutylene; and / or, The dispersant includes at least one of polyethylene glycol and lauric acid.

[0009] Preferably, the antioxidant includes antioxidant CTU, antioxidant MB, and antioxidant 2246.

[0010] Preferably, the mass ratio of antioxidant CTU, antioxidant MB and antioxidant 2246 is 1~3:1:1.

[0011] Preferably, the hindered phenolic primary antioxidant includes at least one of antioxidant 1010 and antioxidant 1076; and / or, The thioester-based auxiliary antioxidants include at least one of dioctadecyl thiodipropionate and dilauryl thiodipropionate; and / or, The light stabilizer includes at least one selected from light stabilizer UV-327, light stabilizer UV-531, light stabilizer 944, and light stabilizer 662; and / or, The zinc-free sulfurizing activator includes magnesium oxide and stearic acid compounds.

[0012] This invention also proposes a method for preparing a yellowing-resistant environmentally friendly composite additive for light-colored rubber products, comprising the following steps: S1. Mix the hindered phenolic primary antioxidant, thioester auxiliary antioxidant, light stabilizer and antioxidant to obtain a premix; S2. Add the remaining components of the anti-yellowing environmentally friendly composite additive to the premix and mix to obtain an anti-yellowing environmentally friendly composite additive for light-colored rubber products.

[0013] The present invention also proposes the application of the light-colored rubber products anti-yellowing environmentally friendly composite additive or the light-colored rubber products anti-yellowing environmentally friendly composite additive prepared by the preparation method described above in rubber products.

[0014] Preferably, based on the weight of the rubber component in the rubber product, 20-30 parts of the light-colored rubber product anti-yellowing environmentally friendly composite additive are added per 100 parts of rubber.

[0015] The beneficial effects of this invention are as follows: In this invention, through the synergistic effect of antioxidants, zinc-free vulcanizing activators, antioxidants, and light stabilizers, the composite additive possesses advantages such as resistance to yellowing, anti-aging, ozone resistance, non-polluting, non-blooming, good dispersibility, easy processing, and environmental friendliness. Specifically, the zinc-free vulcanizing activator utilizes a zinc-free system, avoiding zinc ion-induced yellowing, and simultaneously forms a stable protective network with the antioxidant, improving the crosslinking efficiency and long-term heat stability of the product. Furthermore, the antioxidant, antioxidant, and light stabilizer work synergistically; hindered phenols and thioester antioxidants achieve thermo-oxidative synergy; and the antioxidant and light stabilizer achieve weather resistance and ozone resistance synergistically, ultimately significantly improving the overall performance of the composite additive in terms of product aging. Detailed Implementation

[0016] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0017] A specific embodiment of the first aspect of the present invention provides an environmentally friendly composite additive for light-colored rubber products that is resistant to yellowing, comprising the following components in parts by weight: 0.5-1 parts of hindered phenolic primary antioxidant, 1-5 parts of thioester auxiliary antioxidant, 1-5 parts of light stabilizer, 30-40 parts of antioxidant, and 30-40 parts of zinc-free vulcanizing activator.

[0018] In one embodiment of the present invention, the hindered phenolic main antioxidant may be, for example, antioxidant 1010, antioxidant 1076, etc., preferably antioxidant 1010; Thioester-based auxiliary antioxidants can be, for example, dioctadecyl thiodipropionate (DSTDP) or dilauryl thiodipropionate (DLTP), with dioctadecyl thiodipropionate being preferred. The light stabilizer may be, for example, a benzotriazole light stabilizer, a benzophenone light stabilizer, or a hindered amine light stabilizer, wherein the benzotriazole light stabilizer includes, but is not limited to, light stabilizer UV-327; the benzophenone light stabilizer includes, but is not limited to, light stabilizer UV-531; and the hindered amine light stabilizer includes, but is not limited to, light stabilizer 944 and / or light stabilizer 662; preferably, the light stabilizer is light stabilizer UV-327; Antioxidants include antioxidant CTU, antioxidant MB, and antioxidant 2246, wherein the mass ratio of antioxidant CTU, antioxidant MB, and antioxidant 2246 is 1 to 3:1:1, for example, it can be 1:1:1, 1.5:1:1, 2:1:1, 2.5:1:1, or 3:1:1; The zinc-free vulcanizing activator includes magnesium oxide and stearic acid compounds, wherein the stearic acid compounds include, but are not limited to, stearic acid, calcium stearate and magnesium stearate. Preferably, the zinc-free vulcanizing activator includes the following components in parts by weight: 10-15 parts magnesium oxide, 10-15 parts stearic acid, 5-6 parts calcium stearate and 5-6 parts magnesium stearate.

[0019] In this invention, the antioxidant complex is composed of antioxidants CTU, MB, and 2246, which synergistically improve the comprehensive properties of rubber products, such as resistance to heat and oxygen aging, resistance to ozone aging, and resistance to yellowing. Antioxidant CTU mainly plays a role in resisting ozone, resisting flexural fatigue, and providing weather protection. Antioxidant MB mainly achieves heat and oxygen stabilization and can passivate metal ions. Antioxidant 2246 has the characteristics of resistance to yellowing, resistance to heat and oxygen aging, and non-polluting properties. The performance will be significantly reduced if any one of the three is missing. The optimal ratio of antioxidants CTU, MB, and 2246 is 1 to 3:1:1. The resulting products are less likely to have problems such as insufficient ozone resistance, aggravated yellowing, or blooming. The zinc-free vulcanizing activator uses a zinc-free system of magnesium oxide and stearic acid compounds to avoid yellowing caused by zinc ions. At the same time, it forms a stable protective network with antioxidants CTU, MB and 2246, improving the crosslinking efficiency and long-term heat resistance of light-colored products. If the zinc-free vulcanizing activator is replaced with zinc oxide, light-colored products will show obvious yellowing and graying after heat aging.

[0020] In one embodiment of the present invention, the components of the environmentally friendly composite additive for light-colored rubber products that resists yellowing further include at least one of a dispersant, a plasticizer, an inorganic filler, and a protective wax; wherein, the dispersant includes, but is not limited to, at least one of polyethylene glycol and lauric acid, specifically, the polyethylene glycol may be, for example, polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, polyethylene glycol 1000, polyethylene glycol 2000, polyethylene glycol 4000, etc., preferably polyethylene glycol 4000; Because ordinary plasticizers are highly volatile and have poor weather resistance, they are difficult to simultaneously meet the requirements of yellowing resistance, aging resistance, processability, and environmental protection. Therefore, the plasticizer of the present invention uses at least one of paraffin oil and polyisobutylene to avoid the above problems. Specifically, the number average molecular weight of polyisobutylene is 2000~10000, for example, it can be 2000, 3000, 5000, 7000, 9000, 10000, etc., and the paraffin oil can be, for example, No. 300 paraffin oil, No. 500 paraffin oil, etc. Inorganic fillers can be, for example, calcium carbonate, talc, nano silica, etc., preferably nano silica. Inorganic fillers can play a reinforcing role in rubber products and improve the processing performance of rubber. The protective wax is a microcrystalline wax with a melting point of 60~85℃. For example, the melting point can be 60℃, 65℃, 70℃, 75℃, 80℃, or 85℃.

[0021] In one embodiment of the present invention, the yellowing-resistant environmentally friendly composite additive for light-colored rubber products comprises the following components in parts by weight: 0.5-1 parts hindered phenolic primary antioxidant, 1-5 parts thioester auxiliary antioxidant, 1-5 parts light stabilizer, 30-40 parts antioxidant, 30-40 parts zinc-free vulcanizing activator, 5-10 parts dispersant, 11-23 parts plasticizer, 5-10 parts inorganic filler, and 10-16 parts protective wax.

[0022] In this invention, the anti-yellowing environmentally friendly composite additive for light-colored rubber products integrates protection, activation, plasticization, and dispersion into one-stop addition, reducing batching errors and improving production efficiency and product stability.

[0023] A specific embodiment of the second aspect of the present invention provides a method for preparing a yellowing-resistant environmentally friendly composite additive for light-colored rubber products, used to prepare the yellowing-resistant environmentally friendly composite additive for light-colored rubber products provided in the specific embodiment of the first aspect of the present invention, comprising the following steps: S1. Mix the hindered phenolic primary antioxidant, thioester auxiliary antioxidant, light stabilizer and antioxidant to obtain a premix; S2. Add the remaining components of the anti-yellowing environmentally friendly composite additive to the premix and mix to obtain an anti-yellowing environmentally friendly composite additive for light-colored rubber products.

[0024] The light-colored rubber product anti-yellowing environmentally friendly composite additive of the present invention can be prepared in any equipment capable of material mixing, including but not limited to high-speed mixers.

[0025] In step S1, the mixing temperature is 60~80℃ and the mixing time is 3~5min; When the anti-yellowing environmentally friendly composite additive contains dispersants, plasticizers, inorganic fillers, protective waxes, and other additives, the specific preparation process of the anti-yellowing environmentally friendly composite additive for light-colored rubber products includes: mixing hindered phenolic main antioxidant, thioester auxiliary antioxidant, light stabilizer, antioxidant, and dispersant to obtain a premix; then mixing the premix with plasticizer and inorganic filler for 3-5 minutes, then adding zinc-free vulcanizing activator and protective wax and mixing for 5-10 minutes, followed by pulverization or granulation to obtain the final product.

[0026] The specific embodiments of the third aspect of the present invention provide the application of a yellowing-resistant environmentally friendly composite additive for light-colored rubber products in rubber products.

[0027] In this invention, the amount of yellowing-resistant environmentally friendly composite additive added to rubber products is: based on the weight of the rubber component in the rubber product, 20-30 parts of yellowing-resistant environmentally friendly composite additive for light-colored rubber products are added per 100 parts of rubber. Rubber products include, but are not limited to, natural rubber, styrene-butadiene rubber, cis-butadiene rubber, ethylene propylene rubber, and nitrile rubber; the types of rubber products include, but are not limited to, rubber shoe soles, rubber sealing rings, rubber tubes, rubber toys, and rubber conveyor belts, etc., which are suitable for the performance requirements of rubber products in various fields, especially for light-colored, white, and colored rubber products.

[0028] The present invention will now be described in detail with reference to preferred embodiments and comparative examples. The preferred embodiments of the invention described below can be modified in various ways, and therefore the scope of the invention should not be construed as limited to the preferred embodiments described in detail below. Preferred embodiments are provided to help those skilled in the art to more readily understand the invention.

[0029] Example 1 Environmentally friendly, yellowing-resistant composite additives for light-colored rubber products, comprising the following components in parts by weight: Antioxidant 1010 0.5 parts, DSTDP 1 part, light stabilizer UV-327 1 part, antioxidant 30 parts, polyethylene glycol 4000 3 parts, lauric acid 2 parts, No. 500 paraffin oil 3 parts, nano silica 5 parts, polyisobutylene PIB 2400 8 parts, magnesium oxide 10 parts, stearic acid 10 parts, calcium stearate 5 parts, magnesium stearate 5 parts, microcrystalline wax 10 parts; wherein, the antioxidants are antioxidant CTU, antioxidant MB and antioxidant 2246 in a mass ratio of 1:1:1; A method for preparing a yellowing-resistant, environmentally friendly composite additive for light-colored rubber products includes the following steps: S1. Add antioxidant 1010, DSTDP, light stabilizer UV-327, antioxidant CTU, antioxidant MB, antioxidant 2246, polyethylene glycol 4000 and lauric acid into a high-speed mixer, set the high-speed speed to 800 r / min, and premix at 70℃ for 4 min to obtain a premix. S2. Add No. 500 paraffin oil, nano silica and polyisobutylene PIB 2400 to the premix, heat to 85℃ and continue mixing for 4 minutes until melted and uniformly dispersed. Then add magnesium oxide, stearic acid, calcium stearate, magnesium stearate and microcrystalline wax. Switch to medium speed of 350 r / min and stir for 7 minutes. Cool to below 40℃ and use granulation process. Extrusion granulation controls the particle size to 2.0 mm to obtain the yellowing resistant environmentally friendly composite additive for light-colored rubber products.

[0030] Example 2 Environmentally friendly, yellowing-resistant composite additives for light-colored rubber products, comprising the following components in parts by weight: The ingredients are: 1 part antioxidant 1010, 4 parts DSTDP, 4 parts light stabilizer UV-327, 40 parts antioxidant, 4 parts polyethylene glycol 4000, 3 parts lauric acid, 8 parts No. 500 paraffin oil, 10 parts nano silica, 10 parts polyisobutylene PIB 2400, 12 parts magnesium oxide, 12 parts stearic acid, 6 parts calcium stearate, 5 parts magnesium stearate, and 15 parts microcrystalline wax; wherein, the antioxidants are antioxidant CTU, antioxidant MB, and antioxidant 2246 in a mass ratio of 2:1:1. A method for preparing a yellowing-resistant, environmentally friendly composite additive for light-colored rubber products includes the following steps: S1. Add antioxidant 1010, DSTDP, light stabilizer UV-327, antioxidant CTU, antioxidant MB, antioxidant 2246, polyethylene glycol 4000 and lauric acid into a high-speed mixer, set the high-speed speed to 800 r / min, and premix at 75℃ for 4 min to obtain a premix. S2. Add No. 500 paraffin oil, nano silica and polyisobutylene PIB 2400 to the premix and continue mixing for 5 minutes until melted and uniformly dispersed. Then add magnesium oxide, stearic acid, calcium stearate, magnesium stearate and microcrystalline wax. Switch to medium speed of 350 r / min and stir for 8 minutes. Cool to below 40℃ and use granulation process. Extrusion granulation is used to control the particle size to 2.0 mm to obtain a yellowing resistant environmentally friendly composite additive for light-colored rubber products.

[0031] Example 3 Environmentally friendly, yellowing-resistant composite additives for light-colored rubber products, comprising the following components in parts by weight: Antioxidant 1010 0.8 parts, DSTDP 5 parts, light stabilizer UV-327 5 parts, antioxidant 40 parts, polyethylene glycol 4000 6 parts, lauric acid 4 parts, No. 500 paraffin oil 8 parts, nano silica 7 parts, polyisobutylene PIB 2400 15 parts, magnesium oxide 15 parts, stearic acid 15 parts, calcium stearate 5 parts, magnesium stearate 5 parts, microcrystalline wax 16 parts; wherein, the antioxidants are antioxidant CTU, antioxidant MB and antioxidant 2246 in a mass ratio of 3:1:1; A method for preparing a yellowing-resistant, environmentally friendly composite additive for light-colored rubber products includes the following steps: S1. Add antioxidant 1010, DSTDP, light stabilizer UV-327, antioxidant CTU, antioxidant MB, antioxidant 2246, polyethylene glycol 4000 and lauric acid into a high-speed mixer, set the high-speed speed to 1000 r / min, and premix at 80℃ for 4 min to obtain a premix. S2. Add No. 500 paraffin oil, nano silica and polyisobutylene PIB 2400 to the premix and continue mixing for 3 minutes until melted and uniformly dispersed. Then add magnesium oxide, stearic acid, calcium stearate, magnesium stearate and microcrystalline wax. Switch to medium speed of 450 r / min and stir for 10 minutes. Cool to below 40℃ and use granulation process. Extrusion granulation is used to control the particle size to 3.0 mm to obtain a yellowing resistant environmentally friendly composite additive for light-colored rubber products.

[0032] Example 4 This embodiment is the same as in Example 1, except that antioxidant 2246 is not added and the antioxidants are antioxidant CTU and antioxidant MB in a 1:1 mass ratio.

[0033] Example 5 This embodiment is the same as in Example 1, except that the antioxidant CTU is not added and the antioxidants are MB and 2246 in a 1:1 mass ratio.

[0034] Example 6 This embodiment is the same as in Example 1, except that antioxidant MB is not added and antioxidants CTU and 2246 are used in a 1:1 mass ratio.

[0035] Example 7 This embodiment is the same as in Example 1, except that the antioxidants are CTU, MB and 2246 in a mass ratio of 0.5:1:1.

[0036] Example 8 This embodiment is the same as in Example 1, except that the antioxidants are CTU, MB and 2246 in a mass ratio of 4:1:1.

[0037] Example 9 This embodiment is the same as in Example 1, except that the antioxidants are CTU, MB and 2246 in a mass ratio of 3:1:1.

[0038] Comparative Example 1 This comparative example is the same as Example 1, except that the zinc-free sulfurizing activator (i.e., magnesium oxide, stearic acid, calcium stearate and magnesium stearate) is replaced with 5 parts zinc oxide and 2 parts stearic acid.

[0039] Comparative Example 2 This comparative example is the same as Example 1 except that DSTDP is not added.

[0040] Comparative Example 3 This comparative example is the same as Example 1 except that the light stabilizer UV-327 is not added.

[0041] 1. The composite additives obtained in the above examples and comparative examples were formulated with the following basic formula (by weight): 100 parts natural rubber (model SCR WF), 25 parts silica, 40 parts light calcium carbonate, 5 parts titanium dioxide, 8 parts paraffin oil, 20 parts anti-yellowing environmentally friendly composite additives, 0.8 parts accelerator CZ, 0.6 parts accelerator DM, and 1.75 parts sulfur. Rubber products were then manufactured, and the following performance tests were conducted: (1) Thermo-oxidative aging strength retention rate (70℃×168h): Test standard GB / T 3512; (2) Yellowing resistance rating (light source: UV-A 340nm; cycle: 50℃ / 4h illumination, + 50℃ high humidity / 4h condensation; irradiance: 0.89W / m²@340nm, duration: 100h): test standard GB / T 16585; (3) Ozone aging (50×10 -8 ,20% (40±2)℃×48h): Test standard GB / T 7762.

[0042] The test results are shown in Table 1 below.

[0043] Table 1 Performance Test Results

[0044] As can be seen from the data in Table 1, the comprehensive performance of the anti-yellowing environmentally friendly composite additives prepared in Examples 1-9, such as the retention rate of thermo-oxidative aging strength and the yellowing resistance grade, is better than that of the anti-yellowing environmentally friendly composite additives in Comparative Examples 1-3. This indicates that the thioester auxiliary antioxidant, light stabilizer and anti-aging agent system in this invention are indispensable. The yellowing-resistant environmentally friendly composite additives prepared in Examples 1-3 and 9 exhibit better performance in terms of thermo-oxidative aging strength retention, yellowing resistance grade, and ozone aging than the yellowing-resistant environmentally friendly composite additives in Examples 4-8. This indicates that there is a synergistic effect among antioxidants CTU, MB, and 2246 in this invention, especially when the mass ratio of the three is 1-3:1:1, the synergistic effect is further enhanced.

[0045] 2. Application Example - White Rubber Tube White tubing experimental group: The anti-yellowing environmentally friendly composite additive prepared in Example 1 of this invention is used to manufacture white rubber hoses. The specific formula is as follows (by weight): 100 parts of natural rubber (model SCR WF), 25 parts of silica, 40 parts of light calcium carbonate, 5 parts of titanium dioxide, 8 parts of paraffin oil, 20 parts of anti-yellowing environmentally friendly composite additive, 0.8 parts of accelerator CZ, 0.6 parts of accelerator DM, and 1.75 parts of sulfur. White tubing control group: The traditional white rubber hose is used, and the specific formula is as follows (by weight): 100 parts natural rubber (model SCR WF), 25 parts silica, 40 parts light calcium carbonate, 5 parts titanium dioxide, 12 parts paraffin oil, 8 parts zinc oxide, 2.5 parts stearic acid, 3 parts paraffin wax, 1.8 parts antioxidant MB, 2 parts antioxidant RD, 0.8 parts accelerator CZ, 0.6 parts accelerator DM, and 1.75 parts sulfur.

[0046] 3. Application Example - White EPDM Automotive Rubber Sealing Strip White EPDM automotive rubber sealing strip experimental group: The yellowing-resistant environmentally friendly composite additive obtained in Example 2 of this invention is used to manufacture white EPDM automotive rubber sealing strips. The specific formula is as follows (by weight): 100 parts of EPDM 6537, 35 parts of silica, 50 parts of light calcium carbonate, 7 parts of titanium dioxide, 25 parts of yellowing-resistant environmentally friendly composite additive, 1 part of accelerator BZ, 1 part of accelerator CZ, 0.6 parts of accelerator TMTD, and 0.6 parts of sulfur. White EPDM automotive rubber sealing strip control group: The traditional white EPDM automotive rubber sealing strip is used, and the specific formula is as follows (by weight): 100 parts EPDM 6537, 35 parts silica, 50 parts light calcium carbonate, 7 parts titanium dioxide, 6 parts zinc oxide, 2 parts stearic acid, 3 parts paraffin wax, 2 parts dispersant, 1.8 parts antioxidant MB, 1.8 parts antioxidant RD, 1.0 part antioxidant SP, 1 part accelerator BZ, 1 part accelerator CZ, 0.6 parts accelerator TMTD, and 0.6 parts sulfur.

[0047] According to the above formulas for white rubber tubing and white EPDM automotive rubber sealing strips, the corresponding products were prepared after mixing and vulcanization, and then their performance was tested: Hardness: Test standard GB / T 531.1; Strength: Test standard GB / T 528; Yellowing index: Test standard HG / T 3862; Blooming resistance: Rubber products were placed in a greenhouse for 30 days, and their blooming resistance was visually evaluated. Ozone aging resistance: Test standard GB / T 7762; The test results are shown in Table 2.

[0048] Table 2 Performance Test Results

[0049] As can be seen from the data in Table 2, the overall performance of the experimental group products is better than that of the control group. This indicates that the products with the addition of the yellowing-resistant environmentally friendly composite additive of the present invention, through the synergistic combination of multiple components, have better performance and solve the problems of yellowing, aging, and blooming of light-colored rubber products. Moreover, the yellowing-resistant environmentally friendly composite additive of the present invention can be applied to a wide range of products. In addition to being suitable for the preparation of the above-mentioned rubber hoses and rubber seals, it also has significant market application prospects in the fields of medical supplies, building materials, and wires and cables.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A yellowing-resistant, environmentally friendly composite additive for light-colored rubber products, characterized in that, It includes the following components by weight: 0.5-1 part hindered phenolic primary antioxidant, 1-5 parts thioester auxiliary antioxidant, 1-5 parts light stabilizer, 30-40 parts antioxidant, and 30-40 parts zinc-free vulcanizing activator.

2. The anti-yellowing environmentally friendly composite additive for light-colored rubber products according to claim 1, characterized in that, The components also include at least one of a dispersant, a plasticizer, an inorganic filler, and a protective wax.

3. The environmentally friendly composite additive for light-colored rubber products with yellowing resistance according to claim 2, characterized in that, It includes the following components by weight: 0.5-1 part hindered phenolic primary antioxidant, 1-5 parts thioester auxiliary antioxidant, 1-5 parts light stabilizer, 30-40 parts antioxidant, 30-40 parts zinc-free vulcanizing activator, 5-10 parts dispersant, 11-23 parts plasticizer, 5-10 parts inorganic filler, and 10-16 parts protective wax.

4. The environmentally friendly, yellowing-resistant composite additive for light-colored rubber products according to claim 3, characterized in that, The plasticizer includes at least one of paraffin oil and polyisobutylene; and / or, The dispersant includes at least one of polyethylene glycol and lauric acid.

5. The environmentally friendly, yellowing-resistant composite additive for light-colored rubber products according to any one of claims 1 to 4, characterized in that, The antioxidants include antioxidant CTU, antioxidant MB, and antioxidant 2246.

6. The environmentally friendly composite additive for light-colored rubber products with yellowing resistance according to claim 5, characterized in that, The mass ratio of antioxidant CTU, antioxidant MB and antioxidant 2246 is 1~3:1:

1.

7. The environmentally friendly, yellowing-resistant composite additive for light-colored rubber products according to any one of claims 1 to 4, characterized in that, The hindered phenolic primary antioxidant includes at least one of antioxidant 1010 and antioxidant 1076; and / or, The thioester-based auxiliary antioxidants include at least one of dioctadecyl thiodipropionate and dilauryl thiodipropionate; and / or, The light stabilizer includes at least one selected from light stabilizer UV-327, light stabilizer UV-531, light stabilizer 944, and light stabilizer 662; and / or, The zinc-free sulfurizing activator includes magnesium oxide and stearic acid compounds.

8. A method for preparing a yellowing-resistant environmentally friendly composite additive for light-colored rubber products, used to prepare the yellowing-resistant environmentally friendly composite additive for light-colored rubber products according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Mix the hindered phenolic primary antioxidant, thioester auxiliary antioxidant, light stabilizer and antioxidant to obtain a premix; S2. Add the remaining components of the anti-yellowing environmentally friendly composite additive to the premix and mix to obtain an anti-yellowing environmentally friendly composite additive for light-colored rubber products.

9. The application of the light-colored rubber product anti-yellowing environmentally friendly composite additive according to any one of claims 1 to 7 or the light-colored rubber product anti-yellowing environmentally friendly composite additive prepared by the preparation method according to claim 8 in rubber products.

10. The application according to claim 9, characterized in that, Based on the weight of the rubber component in the rubber product, 20-30 parts of the light-colored rubber product anti-yellowing environmentally friendly composite additive are added per 100 parts of rubber.

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