Yellowing-resistant plasticizer for rubber and preparation method of yellowing-resistant plasticizer

Abstract

The invention discloses a yellowing-resistant plasticizer for rubber and a preparation method of the yellowing-resistant plasticizer, and relates to the technical field of rubber production. The preparation method comprises the following steps: mixing epoxidized soybean oil / epoxidized fatty acid methyl ester, dioctyl phthalate, xanthic acid, composite titanium dioxide, butyl rubber, a cellulose derivative, an ultraviolet light absorber, an antioxidant, an antibacterial agent (such as silver ions and tea polyphenol) and other raw materials according to a specific ratio, heating, stirring, cooling, filtering and the like. According to the plasticizer, the yellowing resistance of a rubber product is remarkably improved, excellent physical properties are kept, meanwhile, the plasticizer has good environmental protection characteristics and biodegradability, and pollution to the environment is reduced. The preparation process is simple, efficient and easy for industrial production. The yellowing-resistant plasticizer disclosed by the invention is suitable for various rubber products such as automobile tires, electric wires and cables, conveyor belts and the like, the market competitiveness of the products is improved, the service life is prolonged, and the yellowing-resistant plasticizer has remarkable economic and social benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber production, and specifically to a yellowing-resistant plasticizer for rubber and a preparation method thereof. Background Art

[0002] Rubber products play a crucial role in industrial production and daily life, and are widely used in fields such as automobile tires, conveyor belts, seals, wire and cable insulation layers, and various rubber hoses. However, rubber materials are often affected by various environmental factors during use, resulting in a decline in performance, and the yellowing phenomenon is particularly prominent. Yellowing not only affects the appearance beauty of rubber products, but may also have an adverse impact on their physical properties and chemical stability, thereby shortening the service life.

[0003] The yellowing phenomenon is mainly caused by the oxidative degradation of unsaturated bonds in rubber under conditions such as light, heat, and oxygen. In addition, additives in rubber (such as plasticizers, anti-aging agents, etc.) may also decompose or react with other components during long-term use, generating colored substances, further exacerbating the yellowing phenomenon. Therefore, developing a yellowing-resistant rubber plasticizer has become the key to improving the quality of rubber products.

[0004] Although traditional rubber plasticizers can improve the processing performance and flexibility of rubber to a certain extent, they often lack sufficient yellowing resistance. To address this challenge, researchers are committed to developing new yellowing-resistant plasticizers. These plasticizers usually enhance the antioxidant capacity and light stability of rubber by introducing components such as antioxidants, ultraviolet absorbers, and hindered phenol compounds, thereby effectively inhibiting the occurrence of the yellowing phenomenon.

[0005] In recent years, with the improvement of environmental awareness and the strictness of regulations, higher requirements have also been put forward for the environmental performance of rubber plasticizers. Therefore, when developing yellowing-resistant plasticizers, factors such as biodegradability, toxicity, and impact on the environment also need to be considered. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a yellowing-resistant plasticizer for rubber and a preparation method thereof, solving the problems raised in the above background art.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A yellowing-resistant plasticizer for rubber, comprising the following raw materials in parts by weight: 80 - 100 parts of a plasticizing compound, 20 - 30 parts of dioctyl phthalate, 20 - 30 parts of a yellowing-resistant aid, 50 - 60 parts of a surfactant, 5 - 10 parts of an ultraviolet absorber, 3 - 5 parts of an antioxidant, 1 - 3 parts of an antibacterial agent, and 2 - 5 parts of a stabilizer.

[0008] Further, the plasticizing compound is one or a mixture of two of epoxidized soybean oil and epoxidized fatty acid methyl ester.

[0009] Further, the anti-yellowing agent is prepared by mixing xanthic acid, composite titanium dioxide and butyl rubber in a ratio of 1:1:2.

[0010] Further, the surfactant is one or a mixture of two of hydroxyethyl cellulose and carboxymethyl cellulose.

[0011] Further, the ultraviolet absorber is one or a mixture of two of 2-hydroxy-4-methoxybenzophenone and 2-hydroxy-4-octoxybenzophenone.

[0012] Further, the antioxidant is one or a mixture of two of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and dilauryl thiodipropionate.

[0013] Further, the bacteriostatic agent is one or a mixture of two of silver ions and tea polyphenols.

[0014] Further, the stabilizer is one or a mixture of two of calcium stearate and zinc stearate.

[0015] Further, the preparation method of the anti-yellowing plasticizer for rubber comprises the following steps:

[0016] S1. Add the plasticizing compound and dioctyl phthalate into a reaction kettle, heat to 60-80 °C, and stir evenly to obtain a premixed solution;

[0017] S2. After mixing the anti-yellowing agent evenly according to the ratio, add it into the premixed solution and continue to stir and mix;

[0018] S3. Then sequentially add the surfactant, ultraviolet absorber, antioxidant, bacteriostatic agent, and stabilizer, and continue to stir for 30-60 minutes until completely dissolved;

[0019] S4. Cool the mixture to room temperature and filter to obtain the anti-yellowing plasticizer for rubber.

[0020] The present invention provides an anti-yellowing plasticizer for rubber and a preparation method thereof. Compared with the prior art, the following beneficial effects are achieved:

[0021] 1. Through a combination of proportioned raw materials, especially the addition of high - efficiency antioxidants (such as pentaerythritol tetra[β-(3,5 - di - tert - butyl - 4 - hydroxyphenyl)propionate]), ultraviolet absorbers (such as 2 - hydroxy - 4 - methoxybenzophenone, 2 - hydroxy - 4 - octoxybenzophenone), and anti - corrosion and antibacterial components such as silver ions, the present invention effectively enhances the antioxidant capacity and light stability of rubber products, significantly reduces the yellowing tendency under the influence of environmental factors such as light, heat, and oxygen, and extends the aesthetic life of rubber products;

[0022] 2. While ensuring the yellowing - resistance performance, the plasticizer of the present invention does not have a negative impact on the physical properties of rubber products. By reasonably adjusting the composition ratio of the plasticizer, the stable performance of rubber products in key physical property indicators such as hardness, tensile strength, and tear strength is ensured, meeting the performance requirements of rubber products in different application scenarios;

[0023] 3. Attention is paid to environmental protection in the selection of raw materials. Renewable resources with good biodegradability such as epoxidized soybean oil and epoxidized fatty acid methyl ester are used, reducing the dependence on non - renewable resources such as petroleum. At the same time, the use of harmful heavy metals and other toxic substances is avoided, reducing environmental pollution during production and use, and conforming to the current development trend of green and low - carbon;

[0024] In summary, the novel yellowing - resistant plasticizer for rubber of the present invention shows significant beneficial effects in improving the quality of rubber products, extending the service life, protecting the environment, and promoting the sustainable development of the rubber industry, and has broad market application prospects and social value. Detailed implementation mode

[0025] Next, the technical solutions of the present invention will be described in detail through specific examples. However, it should be clearly stated that these examples are for illustrative purposes only and are not construed as limiting the scope of the present invention.

[0026] Example 1

[0027] A yellowing - resistant plasticizer for rubber comprises the following raw materials in parts by weight: 80 parts of epoxidized soybean oil, 20 parts of dioctyl phthalate, 5 parts of xanthic acid, 5 parts of composite titanium dioxide, 10 parts of butyl rubber, 50 parts of hydroxyethyl cellulose, 5 parts of 2 - hydroxy - 4 - methoxybenzophenone, 3 parts of pentaerythritol tetra[β-(3,5 - di - tert - butyl - 4 - hydroxyphenyl)propionate], 1 part of silver ions, and 2 parts of calcium stearate.

[0028] The preparation method of the above - mentioned yellowing - resistant plasticizer for rubber comprises the following steps:

[0029] S1. Add epoxidized soybean oil and dioctyl phthalate into a reaction kettle, heat to 60°C, and stir evenly to obtain a premixed solution;

[0030] S2. After uniformly mixing xanthic acid, composite titanium dioxide and butyl rubber, add them to the premixed solution and continue to stir and mix;

[0031] S3. Then successively add hydroxyethyl cellulose, 2-hydroxy-4-methoxybenzophenone, pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], silver ions, calcium stearate, and continue to stir for 30 minutes until completely dissolved;

[0032] S4. Cool the mixture to room temperature, filter, and obtain the yellowing-resistant plasticizer for rubber.

[0033] Example 2

[0034] A yellowing-resistant plasticizer for rubber, comprising the following raw materials in parts by weight: 100 parts of epoxy fatty acid methyl ester, 30 parts of dioctyl phthalate, 7.5 parts of xanthic acid, 7.5 parts of composite titanium dioxide, 15 parts of butyl rubber, 60 parts of carboxymethyl cellulose, 10 parts of 2-hydroxy-4-octyloxybenzophenone, 5 parts of dilauryl thiodipropionate, 3 parts of tea polyphenols, 5 parts of zinc stearate.

[0035] The above-mentioned yellowing-resistant plasticizer for rubber, the preparation method comprises the following steps:

[0036] S1. Add epoxy fatty acid methyl ester and dioctyl phthalate to the reaction kettle, heat to 80 °C, stir evenly, and obtain a premixed solution;

[0037] S2. After uniformly mixing xanthic acid, composite titanium dioxide and butyl rubber, add them to the premixed solution and continue to stir and mix;

[0038] S3. Then successively add carboxymethyl cellulose, 2-hydroxy-4-octyloxybenzophenone, dilauryl thiodipropionate, tea polyphenols, zinc stearate, and continue to stir for 60 minutes until completely dissolved;

[0039] S4. Cool the mixture to room temperature, filter, and obtain the yellowing-resistant plasticizer for rubber.

[0040] Example 3

[0041] A yellowing-resistant plasticizer for rubber, comprising the following raw materials in parts by weight: 40 parts of epoxy soybean oil, 50 parts of epoxy fatty acid methyl ester, 26 parts of dioctyl phthalate, 6 parts of xanthic acid, 6 parts of composite titanium dioxide, 12 parts of butyl rubber, 25 parts of hydroxyethyl cellulose, 30 parts of carboxymethyl cellulose, 4 parts of 2-hydroxy-4-methoxybenzophenone, 4 parts of 2-hydroxy-4-octyloxybenzophenone, 2 parts of pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2 parts of dilauryl thiodipropionate, 1 part of silver ions, 1 part of tea polyphenols, 2 parts of calcium stearate, 2 parts of zinc stearate.

[0042] The above yellowing-resistant plasticizer for rubber, the preparation method comprises the following steps:

[0043] S1. Add epoxidized soybean oil, epoxidized fatty acid methyl ester and dioctyl phthalate into a reaction kettle, heat to 70 °C, stir evenly to obtain a premixed liquid;

[0044] S2. Mix xanthic acid, composite titanium dioxide and butyl rubber evenly, then add them into the premixed liquid and continue to stir and mix;

[0045] S3. Then successively add hydroxyethyl cellulose, carboxymethyl cellulose, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], dilauryl thiodipropionate, silver ions, tea polyphenols, calcium stearate, zinc stearate, and continue to stir for 50 minutes until completely dissolved;

[0046] S4. Cool the mixture to room temperature, filter to obtain the yellowing-resistant plasticizer for rubber.

[0047] Experimental design

[0048] Control group:

[0049] Use a common rubber plasticizer (without yellowing-resistant components).

[0050] Experimental group:

[0051] Use the yellowing-resistant plasticizers produced in Example 1, Example 2 and Example 3 respectively.

[0052] Experimental steps:

[0053] 1. Add the plasticizers of each group into rubber products respectively and process them according to the conventional process.

[0054] 2. Place the processed rubber products under light conditions (such as a xenon lamp aging test chamber) for aging test, and set a certain test time (such as 1000 hours).

[0055] 3. Regularly observe and record the color change of the rubber products, and use a color difference meter to measure the color change value (ΔE).

[0056] Experimental results

[0057] Group Type of plasticizer Testing time (hours) Color change value (ΔE) Control group Common rubber plasticizer 1000 5.0 Experimental group 1 Yellowing-resistant plasticizer of Example 1 1000 1.2 Experimental group 2 Yellowing-resistant plasticizer of Example 2 1000 1.5 Experimental group 3 Yellowing-resistant plasticizer of Example 3 1000 1.0

[0058] Experimental conclusion

[0059] As can be seen from the table, after the same period of light aging test, the color of the rubber products in the control group using ordinary rubber plasticizers changed significantly, while the color of the rubber products in the experimental groups using the anti-yellowing plasticizers produced in Example 1, Example 2 and Example 3 changed less. This shows that the produced anti-yellowing plasticizer has a significant anti-yellowing effect and can effectively extend the service life of rubber products and maintain their aesthetics.

Claims

1. A yellowing-resistant plasticizer for rubber, characterized in that, It comprises the following raw materials in parts by weight: 80 - 100 parts of a plasticizing compound, 20 - 30 parts of dioctyl phthalate, 20 - 30 parts of a yellowing resistance aid, 50 - 60 parts of a surfactant, 5 - 10 parts of an ultraviolet absorber, 3 - 5 parts of an antioxidant, 1 - 3 parts of an antibacterial agent, and 2 - 5 parts of a stabilizer.

2. The anti-yellowing plasticizer for rubber according to claim 1, wherein, The plasticizing compound is one or a mixture of two of epoxidized soybean oil and methyl epoxidized fatty acid ester.

3. The anti-yellowing plasticizer for rubber according to claim 1, characterized in that, The yellowing resistance aid is formed by mixing xanthic acid, composite titanium dioxide and butyl rubber in a ratio of 1:1:

2.

4. A yellowing-resistant plasticizer for rubber according to claim 1, characterized in that, The surfactant is one or a mixture of two of hydroxyethyl cellulose and carboxymethyl cellulose.

5. A yellowing-resistant plasticizer for rubber according to claim 1, characterized in that, The ultraviolet absorber is one or a mixture of two of 2 - hydroxy - 4 - methoxybenzophenone and 2 - hydroxy - 4 - octoxybenzophenone.

6. The anti-yellowing plasticizer for rubber according to claim 1, characterized in that, The antioxidant is one or a mixture of two of pentaerythritol tetrakis [β - (3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate] and dilauryl thiodipropionate.

7. A yellowing-resistant plasticizer for rubber according to claim 1, characterized in that, The antibacterial agent is one or a mixture of two of silver ions and tea polyphenols.

8. An anti-yellowing plasticizer for rubber according to claim 1, characterized in that, The stabilizer is one or a mixture of two of calcium stearate and zinc stearate.

9. A yellowing-resistant plasticizer for rubber according to any one of claims 1-9, characterized in that, The preparation method comprises the following steps: S1. Add the plasticizing compound and dioctyl phthalate into a reaction kettle, heat to 60 - 80 °C, and stir evenly to obtain a premixed solution. S2. After mixing the yellowing resistance aid evenly in proportion, add it into the premixed solution and continue to stir and mix. S3. Then sequentially add the surfactant, ultraviolet absorber, antioxidant, antibacterial agent, and stabilizer, and continue to stir for 30 - 60 minutes until completely dissolved. S4. Cool the mixture to room temperature, filter, and obtain the yellowing resistance plasticizer for rubber.