Yellowing-resistant polishing-free two-component rubber treating agent and using method thereof

Abstract

The invention provides a yellowing-resistant polishing-free two-component rubber treating agent and a using method thereof.The yellowing-resistant polishing-free two-component rubber treating agent is composed of a first component and a second component, the first component is prepared from, by weight, 40-60 parts of modified chloroprene rubber emulsion, 5-10 parts of coupling agent, 2-5 parts of antioxidant and 3-6 parts of light stabilizer, and the second component is prepared from, by weight, 40-60 parts of modified chloroprene rubber emulsion, 5-10 parts of coupling agent, 2-5 parts of antioxidant and 3-6 parts of light stabilizer; 2-4 parts of a defoaming agent and 3-6 parts of a dispersing agent; the second component is nano-scale aluminum oxide modified silicon dioxide powder modified by organic silicon or nano-scale silicon dioxide powder modified by organic silicon; the weight ratio of the first component to the second component is (5: 1)-(10: 1). According to the present invention, the binding force between the rubber and other materials can be effectively improved without polishing the rubber surface, the excellent yellowing resistance is provided, and the environmental protection requirement is met, such that the rubber product processing procedure is simplified, the product quality is improved, and the environmental protection development trend is adapted.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber treatment agents, and in particular to a two-component rubber treatment agent for rubber surface treatment, which has yellowing resistance and does not require grinding operations, and is particularly suitable for surface pretreatment of various rubber products before bonding, coating and other processing. Background Art

[0002] In the field of rubber product processing, rubber treatment agents play a vital role. At present, there are many problems that need to be solved in the rubber treatment agents on the market. For example: First, most rubber treatment agents require the rubber surface to be polished when used, which is an extremely cumbersome process. Polishing not only consumes a lot of manpower and time, increasing production costs, but also it is difficult to ensure the uniformity of the rubber surface by manual polishing. It is easy to have excessive or insufficient local polishing, which in turn affects the subsequent combination effect with other materials and reduces the overall quality of rubber products. Second, the existing rubber treatment agents, especially the traditional treatment agents with chlorine-containing compounds such as TCCA, have poor yellowing resistance. In daily use, affected by environmental factors such as light, high temperature, and oxygen, the treated rubber products are prone to yellowing, especially light-colored rubber products and rubber products used for interior decoration that have strict appearance requirements. Yellowing will greatly reduce their beauty and seriously affect product quality and market competitiveness. Furthermore, traditional rubber treatment agents are not environmentally friendly and contain harmful substances such as volatile organic compounds (VOCs), which do not conform to the current green environmental protection concept, which not only endangers the health of operators, but also is not conducive to the ecological environment. In view of this, it is of great significance to develop a yellowing-resistant and sanding-free two-component rubber treatment agent. Summary of the invention

[0003] Aiming at the problems of poor yellowing resistance and complicated process of existing rubber treating agents, the present invention provides a yellowing-resistant and polishing-free two-component rubber treating agent and a use method thereof.

[0004] The implementation mode of the present invention is as follows: a yellowing-resistant and polish-free two-component rubber treatment agent comprises a first component and a second component; the first component comprises, by weight, 40-60 parts of a modified chloroprene rubber latex, 5-10 parts of a silane coupling agent, 2-5 parts of an antioxidant, 3-6 parts of a light stabilizer, 2-4 parts of a defoaming agent, and 3-6 parts of a dispersant; the second component is an active filler, and the active filler is one of a nano-scale alumina-modified silica powder modified by organosilicon or a nano-scale silica powder modified by organosilicon; and the weight ratio of the first component to the second component is 5:1-10:1.

[0005] Preferably, the modified chloroprene rubber latex is a chloroprene rubber latex modified by GMA monomer grafting. The chloroprene rubber latex modified by GMA monomer has an optimized molecular chain structure, which can better form a continuous, uniform and well-adhesive film layer on the rubber surface, and has good compatibility with other components added subsequently, which can effectively improve the activity of the rubber surface, enhance the bonding force with other materials, and has a certain aging resistance and yellowing resistance performance basis.

[0006] Preferably, the silane coupling agent is one of KH-550, KH-570, and A-151. The use of silane coupling agent KH-550, KH-570 or A-151 can build a chemical bonding bridge between the rubber surface and other components in the treatment agent and the subsequent materials to be combined, further improve the bonding effect, promote the adhesion between rubber and adhesives, coatings, etc., and help improve the stability of the entire treatment agent system.

[0007] Preferably, the antioxidant is a mixture of a hindered phenolic antioxidant and a thioester auxiliary antioxidant. Hindered phenolic antioxidants can capture free radicals generated by chloroprene latex during use and storage, inhibit the oxidation reaction, and thus delay the yellowing phenomenon caused by oxidation. Because free radicals can trigger a chain reaction, causing the molecular structure of latex to change, produce chromophores and turn yellow, antioxidants block the adverse process caused by this free radical. Thioester auxiliary antioxidants and hindered phenolic antioxidants work together to decompose hydroperoxides, prevent hydroperoxides from further initiating free radical chain reactions, keep the molecular structure of chloroprene latex relatively stable, inhibit yellowing, and further enhance the overall yellowing resistance. Further preferably, the hindered phenolic antioxidant is one or a combination of 1010 antioxidants and 1076 antioxidants, and the thioester auxiliary antioxidant is one or a combination of antioxidants DLTP and DSTP.

[0008] Preferably, the light stabilizer is a hindered amine light stabilizer. The main function of the hindered amine light stabilizer is to absorb and shield harmful light such as ultraviolet rays, prevent the rubber treatment agent and the treated rubber products from undergoing photochemical reactions under light conditions, thereby significantly improving the yellowing resistance and ensuring that the rubber products can still maintain a good appearance color when used for a long time or exposed to sunlight. The light stabilizer is one of 770 light stabilizers and 944 light stabilizers, or a combination of both.

[0009] Preferably, the defoamer is a polyether-modified silicon defoamer. The polyether-modified silicon defoamer is used to eliminate bubbles generated during the preparation and use of the first component to prevent bubbles from affecting the film-forming uniformity and bonding effect of the treatment agent on the rubber surface. The polyether-modified silicon defoamer combines the advantages of polyether and silicone defoamers, is non-toxic and harmless, has a small addition amount, is cost-effective, and has good defoaming and anti-foaming properties.

[0010] Preferably, the dispersant is an anionic sulfonate. Further preferably, the dispersant is one or a combination of lignin sulfonate and alkylnaphthalene sulfonate. Lignin sulfonate has good dispersibility, a wide range of sources, low cost, can effectively reduce the surface tension of the system, and make the powder and other particles evenly dispersed in the system. Alkylnaphthalene sulfonate has high dispersion efficiency and stability, can prevent particle agglomeration in the rubber treatment agent system, and improve the uniformity and stability of the system. Lignin sulfonate and alkylnaphthalene sulfonate as dispersants can ensure that each component is evenly dispersed in the emulsion system and ensure the consistency of the treatment agent performance. The anionic sulfonate molecular structure is used with a lipophilic hydrocarbon chain at one end and a hydrophilic polar group at the other end. The latex particles are better dispersed in the system through charge repulsion, and the particles are prevented from agglomerating and precipitating. The cost is relatively low and it is widely used. It can effectively improve the stability of the chloroprene latex system specially grafted and modified by GMA.

[0011] Preferably, the preparation method of the first component comprises the following steps: step 1, after cleaning and drying the reactor, adding modified chloroprene rubber latex, starting the stirring device, setting the stirring speed to 300-500r / min, and controlling the temperature in the reactor to 25°C-35°C; step 2, slowly adding a silane coupling agent, and continuously stirring for 30-60min to make the silane coupling agent fully and evenly dispersed in the modified chloroprene rubber latex; step 3, then adding an antioxidant and a light stabilizer in sequence, stirring for 20-40min after each component is added to ensure that each component is completely dissolved and evenly mixed with each other; step 4, then adding a defoamer and a dispersant, continuing stirring for 30-50min, then stopping stirring, filtering and removing impurities from the obtained first component, putting it into a sealed container, and storing it at room temperature for standby use.

[0012] Preferably, the preparation method of the second component comprises the following steps: step 1, adding organosilane to an alcohol solvent to prepare a silane solution with a mass fraction of 1%-5%; step 2, selecting nano-scale alumina-modified silica powder or silica powder as an active filler, and controlling its particle size within the range of 50-200nm, mixing the nano-alumina-modified silica powder or silica powder with the silane solution at a flow rate of 100-400ml / min through a constant flow pump, and stirring the reaction at a rate of 120-150r / min for 4-6h to obtain an intermediate; step 3, placing the intermediate in an oven for drying; step 4, calcining the dried intermediate at 300℃-500℃ for 2-4h, and the treated powder is the second component, which is naturally cooled and sealed for storage.

[0013] The method for using the yellowing-resistant and sanding-free two-component rubber treating agent described in any of the above items comprises the following steps: step 1, slowly adding the second component to the first component, and continuously stirring to make the second component evenly dispersed in the first component, so as to obtain a two-component rubber treating agent that can be directly used for rubber surface treatment; step 2, selecting a rubber product to be treated, and evenly coating the two-component rubber treating agent on the rubber surface, with the coating thickness controlled at 0.1-0.5 mm; step 3, naturally drying the coated rubber at room temperature or drying it in an oven at 50°C-60°C, so that the treating agent forms a stable film layer on the rubber surface.

[0014] The working principle of the yellowing-resistant and polish-free two-component rubber treatment agent of the present invention is as follows: after the first component and the second component are mixed, the second component is uniformly dispersed in the emulsion system formed by the first component. When used, the mixed treatment agent is coated on the rubber surface, and the modified chloroprene rubber emulsion in the first component is first spread on the rubber surface and forms a continuous film, and the silane coupling agent begins to play a role, with one end bonding with the active group on the rubber surface, and the other end generating chemical bonds with other components in the treatment agent and materials such as adhesives to be combined later. Antioxidants and light stabilizers respectively maintain the stable performance of the treatment agent and rubber products from the perspectives of inhibiting oxidation and resisting light, and prevent degradation phenomena such as yellowing. The active filler in the second component provides more binding sites between the treatment agent and the rubber by filling pores, increasing roughness, etc., so that the treatment agent is firmly attached to the rubber surface, thereby significantly improving the bonding force between the rubber and other materials, and achieving a treatment effect of no polishing and yellowing resistance.

[0015] Beneficial effects of the present invention: (1) Advantage of no grinding: When using the two-component rubber treatment agent of the present invention, there is no need to perform tedious grinding operations on the rubber surface, and it can be directly applied and used, which greatly simplifies the processing process of rubber products, saves manpower and time costs, and avoids quality problems such as uneven rubber surface caused by grinding, effectively ensuring the overall quality of rubber products. (2) Excellent yellowing resistance: By adding antioxidants and light stabilizers, and combining the yellowing resistance of the modified chloroprene rubber emulsion itself, the treated rubber products can effectively resist the occurrence of yellowing when used for a long time and are affected by environmental factors such as light and high temperature, and maintain a good appearance color for a long time. It is particularly suitable for rubber product application scenarios with high requirements for appearance, thereby improving the market competitiveness of the product. (3) Good bonding strength enhancement effect: The synergistic cooperation of the first component and the second component forms a firm bond between the treatment agent and the rubber and between the rubber and the subsequent materials. Whether it is bonded with an adhesive or as a primer applied as a coating, it can show a high bonding strength, ensuring that the layers of the rubber product will not be easily separated during use, thereby extending the service life of the product. (4) Environmental performance: The rubber treatment agent of the present invention focuses on environmental protection in the selection of ingredients, minimizes the use of harmful substances such as volatile organic compounds (VOCs), complies with relevant environmental protection standards, and has less harm to the health of operators and the environment during production and use. DETAILED DESCRIPTION

[0016] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments. Example

[0017] A yellowing-resistant and polish-free two-component rubber treatment agent comprises a first component and a second component, wherein the weight ratio of the first component to the second component is 10:1; the first component comprises, by weight, 40 parts of modified chloroprene rubber latex, 5 parts of silane coupling agent, 2 parts of antioxidant, 6 parts of light stabilizer, 2 parts of defoamer and 3 parts of dispersant; the second component is an active filler, which is a nano-scale alumina-modified silica powder modified by organic silicon. The modified chloroprene rubber latex is a chloroprene rubber latex modified by grafting with GMA monomer; the silane coupling agent is KH-550 silane coupling agent; the antioxidant is a mixture of a hindered phenol antioxidant and a thioester auxiliary antioxidant, and the ratio of the two is 1:1, wherein the hindered phenol antioxidant is 1010 antioxidant, and the thioester auxiliary antioxidant is dilauryl thiodipropionate; the light stabilizer is 770 light stabilizer; the defoamer is HOS 435; and the dispersant is sodium lignin sulfonate of anionic sulfonate.

[0018] In this embodiment, the preparation method of the first component includes the following steps: step 1, after cleaning and drying the reactor, add the modified chloroprene rubber latex, start the stirring device, set the stirring speed to 500r / min, and control the temperature in the reactor at 30°C; step 2, slowly add the silane coupling agent, and continue stirring for 30 minutes to make the silane coupling agent fully and evenly dispersed in the modified chloroprene rubber latex; step 3, then add the antioxidant and the light stabilizer in sequence, and stir for 20 minutes after each component is added to ensure that the components are completely dissolved and mixed evenly with each other; step 4, then add the defoamer and the dispersant, continue stirring for 30 minutes, then stop stirring, filter and remove impurities from the obtained first component, put it into a sealed container, and store it at room temperature for standby use.

[0019] In this embodiment, the preparation method of the second component includes the following steps: step 1, adding organic silane to isopropanol to prepare a silane solution with a mass fraction of 2.5%; step 2, selecting nano-scale alumina-modified silica powder as an active filler, and controlling its particle size within the range of 50-200nm, mixing the nano-alumina-modified silica powder with the silane solution at a flow rate of 200ml / min through a constant flow pump, and stirring and reacting at a rate of 150r / min for 4h to obtain an intermediate; step 3, placing the intermediate in an oven for drying; step 4, calcining the dried intermediate at 500°C for 2h, and the treated powder is the second component, which is naturally cooled and sealed for storage for later use.

[0020] The method for using the above-mentioned yellowing-resistant and sanding-free two-component rubber treating agent comprises the following steps: step 1, slowly adding the second component into the first component, and continuously stirring to make the second component evenly dispersed in the first component, so as to obtain a two-component rubber treating agent that can be directly used for rubber surface treatment; step 2, selecting a natural rubber product to be treated, and evenly coating the two-component rubber treating agent on the surface of the natural rubber, and controlling the coating thickness to be 0.1 mm; step 3, naturally drying the coated rubber at room temperature, so that the treating agent forms a stable film layer on the rubber surface. Example

[0021] A yellowing-resistant and polish-free two-component rubber treatment agent comprises a first component and a second component, wherein the weight ratio of the first component to the second component is 8:1; the first component comprises, by weight: 50 parts of modified chloroprene rubber latex, 7 parts of silane coupling agent, 3 parts of antioxidant, 4 parts of light stabilizer, 3 parts of defoamer and 4 parts of dispersant; the second component is an active filler, which is a nano-scale alumina-modified silica powder modified by organic silicon. Among them, the modified chloroprene rubber latex is a chloroprene rubber latex modified by GMA monomer grafting; the silane coupling agent is KH-570 silane coupling agent; the antioxidant is a mixture of a hindered phenol antioxidant and a thioester auxiliary antioxidant, and the ratio of the two is 2:3, wherein the hindered phenol antioxidant is 1076 antioxidant, and the thioester auxiliary antioxidant is distearyl thiodipropionate; the light stabilizer is 944 light stabilizer; the defoamer is 1488 defoamer; and the dispersant is sodium alkyl naphthalene sulfonate in anionic sulfonates.

[0022] In this embodiment, the preparation method of the first component includes the following steps: step 1, after cleaning and drying the reactor, add the modified chloroprene rubber latex, start the stirring device, set the stirring speed to 450r / min, and control the temperature in the reactor at 35°C; step 2, slowly add the silane coupling agent, and continue stirring for 45 minutes to make the silane coupling agent fully and evenly dispersed in the modified chloroprene rubber latex; step 3, then add the antioxidant and the light stabilizer in sequence, and stir for 25 minutes after each component is added to ensure that the components are completely dissolved and mixed evenly with each other; step 4, then add the defoamer and the dispersant, continue stirring for 35 minutes, then stop stirring, filter and remove impurities from the obtained first component, put it into a sealed container, and store it at room temperature for standby use.

[0023] In this embodiment, the preparation method of the second component includes the following steps: step 1, adding organic silane to ethylene glycol solvent to prepare a silane solution with a mass fraction of 1%; step 2, selecting nano-scale alumina-modified silica powder as an active filler, and controlling its particle size within the range of 50-200nm, mixing the nano-alumina-modified silica powder and the silane solution at a flow rate of 100ml / min through a constant flow pump, and stirring and reacting at a rate of 150r / min for 5h to obtain an intermediate; step 3, placing the intermediate in an oven for drying; step 4, calcining the dried intermediate at 400°C for 3h, and the treated powder is the second component, which is naturally cooled and sealed for storage for later use.

[0024] The method for using the above-mentioned yellowing-resistant and sanding-free two-component rubber treating agent comprises the following steps: step 1, slowly adding the second component into the first component, and continuously stirring to make the second component evenly dispersed in the first component, so as to obtain a two-component rubber treating agent that can be directly used for rubber surface treatment; step 2, selecting a styrene-butadiene rubber product to be treated, and evenly coating the two-component rubber treating agent on the surface of the styrene-butadiene rubber product, and controlling the coating thickness to be 0.5 mm; step 3, naturally drying the coated rubber at room temperature, so that the treating agent forms a stable film layer on the rubber surface. Example

[0025] A yellowing-resistant and polish-free two-component rubber treatment agent comprises a first component and a second component, wherein the weight ratio of the first component to the second component is 6:1; the first component comprises, by weight, 60 parts of modified chloroprene rubber latex, 10 parts of silane coupling agent, 5 parts of antioxidant, 6 parts of light stabilizer, 4 parts of defoamer and 6 parts of dispersant; the second component is an active filler, which is nano-scale silicon dioxide powder modified by organic silicon. The modified chloroprene rubber latex is a chloroprene rubber latex modified by grafting with GMA monomer; the silane coupling agent is A151 silane coupling agent; the antioxidant is a mixture of a hindered phenol antioxidant and a thioester auxiliary antioxidant, and the ratio of the two is 3:2, wherein the hindered phenol antioxidant is a mixture of 1010 antioxidant and 1076 antioxidant, and the weight ratio of the two is 1:1; the light stabilizer is a mixture of 770 light stabilizer and 944 light stabilizer, and the weight ratio of the two is 1:1; the defoamer is BS 1860CN defoamer; the dispersant is an anionic sulfonate, and the anionic sulfonate is a mixture of sodium lignin sulfonate and sodium alkylnaphthalene sulfonate, and the weight ratio of the two is 1:1.

[0026] In this embodiment, the preparation method of the first component includes the following steps: step 1, after cleaning and drying the reactor, add the modified chloroprene rubber latex, start the stirring device, set the stirring speed to 300r / min, and control the temperature in the reactor at 35°C; step 2, slowly add the silane coupling agent, and continue stirring for 60 minutes to make the silane coupling agent fully and evenly dispersed in the modified chloroprene rubber latex; step 3, then add the antioxidant and the light stabilizer in sequence, and stir for 40 minutes after each component is added to ensure that the components are completely dissolved and mixed evenly with each other; step 4, then add the defoamer and the dispersant, continue stirring for 50 minutes, then stop stirring, filter and remove impurities from the obtained first component, put it into a sealed container, and store it at room temperature for use.

[0027] In this embodiment, the preparation method of the second component includes the following steps: step 1, adding organic silane to ethylene glycol solvent to prepare a silane solution with a mass fraction of 5%; step 2, selecting nano-scale silica powder as an active filler, and controlling its particle size within the range of 50-200nm, mixing the nano-alumina modified silica powder and the silane solution at a flow rate of 400ml / min through a constant flow pump, and stirring and reacting at a rate of 120r / min for 6h to obtain an intermediate; step 3, placing the intermediate in an oven for drying; step 4, calcining the dried intermediate at 500°C for 2h, and the treated powder is the second component, which is naturally cooled and sealed for storage for later use.

[0028] The method for using the above-mentioned yellowing-resistant and sanding-free two-component rubber treating agent comprises the following steps: step 1, slowly adding the second component into the first component, and continuously stirring to make the second component evenly dispersed in the first component, so as to obtain the two-component rubber treating agent that can be directly used for rubber surface treatment; step 2, selecting a chloroprene rubber product to be treated, and evenly coating the two-component rubber treating agent on the surface of the chloroprene rubber product, and the coating thickness is controlled to be 0.2 mm; step 3, naturally drying the coated rubber at room temperature, so that the treating agent forms a stable film layer on the rubber surface. Example

[0029] A yellowing-resistant and polish-free two-component rubber treatment agent comprises a first component and a second component, wherein the weight ratio of the first component to the second component is 5:1; the first component comprises, by weight: 45 parts of modified chloroprene rubber latex, 6 parts of silane coupling agent, 3 parts of antioxidant, 4 parts of light stabilizer, 3 parts of defoamer and 5 parts of dispersant; the second component is an active filler, which is a nano-scale alumina-modified silica powder modified by organic silicon. Among them, the modified chloroprene rubber latex is a chloroprene rubber latex modified by GMA monomer grafting; the silane coupling agent is a silane coupling agent compounded with KH-570; the antioxidant is a mixture of a hindered phenol antioxidant and a thioester auxiliary antioxidant, and the ratio of the two is 1:2, wherein the hindered phenol antioxidant is 1010 antioxidant, and the thioester auxiliary antioxidant is distearyl thiodipropionate; the light stabilizer is 944 light stabilizer among hindered amine light stabilizers; the defoamer is 1488 defoamer; and the dispersant is sodium alkylnaphthalene sulfonate among anionic sulfonates.

[0030] In this embodiment, the preparation method of the first component includes the following steps: step 1, after cleaning and drying the reactor, add the modified chloroprene rubber latex, start the stirring device, set the stirring speed to 350r / min, and control the temperature in the reactor at 30°C; step 2, slowly add the silane coupling agent, and continue stirring for 45 minutes to make the silane coupling agent fully and evenly dispersed in the modified chloroprene rubber latex; step 3, then add the antioxidant and the light stabilizer in sequence, and stir for 25 minutes after each component is added to ensure that the components are completely dissolved and mixed evenly with each other; step 4, then add the defoamer and the dispersant, continue stirring for 35 minutes, then stop stirring, filter and remove impurities from the obtained first component, put it into a sealed container, and store it at room temperature for standby use.

[0031] In this embodiment, the preparation method of the second component includes the following steps: step 1, adding organic silane to ethylene glycol solvent to prepare a silane solution with a mass fraction of 3%; step 2, selecting nano-scale alumina-modified silica powder as an active filler, and controlling its particle size within the range of 50-200nm, mixing the nano-alumina-modified silica powder and the silane solution at a flow rate of 150ml / min through a constant flow pump, and stirring the reaction at a rate of 135r / min for 4.5h to obtain an intermediate; step 3, placing the intermediate in an oven for drying; step 4, calcining the dried intermediate at 400°C for 3h, and the treated powder is the second component, which is naturally cooled and sealed for storage for later use.

[0032] The method for using the above-mentioned yellowing-resistant and sanding-free two-component rubber treating agent comprises the following steps: step 1, slowly adding the second component to the first component, and continuously stirring to make the second component evenly dispersed in the first component, to obtain a two-component rubber treating agent that can be directly used for rubber surface treatment; step 2, selecting a butadiene rubber product to be treated, and evenly coating the two-component rubber treating agent on the surface of the butadiene rubber product, and the coating thickness is controlled to be 0.2 mm; step 3, naturally drying the coated rubber at room temperature, so that the treating agent forms a stable film layer on the rubber surface. Example

[0033] A yellowing-resistant and polish-free two-component rubber treatment agent comprises a first component and a second component, wherein the weight ratio of the first component to the second component is 7:1; the first component comprises, by weight: 55 parts of modified chloroprene rubber latex, 8 parts of silane coupling agent, 3 parts of antioxidant, 5 parts of light stabilizer, 3 parts of defoamer and 5 parts of dispersant; the second component is an active filler, which is nano-scale silicon dioxide powder modified by organic silicon. Among them, the modified chloroprene rubber latex is a chloroprene rubber latex modified by GMA monomer grafting; the silane coupling agent is KH-570 silane coupling agent; the antioxidant is a mixture of a hindered phenol antioxidant and a thioester auxiliary antioxidant, and the ratio of the two is 1:2, wherein the hindered phenol antioxidant is 1076 antioxidant, and the thioester auxiliary antioxidant is dilauryl thiodipropionate; the light stabilizer is 770 light stabilizer; the defoamer is 1488 defoamer; and the dispersant is sodium lignin sulfonate in anionic sulfonate.

[0034] In this embodiment, the preparation method of the first component includes the following steps: step 1, after cleaning and drying the reactor, add the modified chloroprene rubber latex, start the stirring device, set the stirring speed to 450r / min, and control the temperature in the reactor at 25°C; step 2, slowly add the silane coupling agent, and continue stirring for 45 minutes to make the silane coupling agent fully and evenly dispersed in the modified chloroprene rubber latex; step 3, then add the antioxidant and the light stabilizer in sequence, and stir for 25 minutes after each component is added to ensure that the components are completely dissolved and mixed evenly with each other; step 4, then add the defoamer and the dispersant, continue stirring for 40 minutes, then stop stirring, filter and remove impurities from the obtained first component, put it into a sealed container, and store it at room temperature for standby use.

[0035] In this embodiment, the preparation method of the second component includes the following steps: step 1, adding organic silane to ethylene glycol solvent to prepare a silane solution with a mass fraction of 2%; step 2, selecting nano-scale alumina-modified silica powder as an active filler, and controlling its particle size within the range of 50-200nm, mixing the nano-alumina-modified silica powder and the silane solution at a flow rate of 300ml / min through a constant flow pump, and stirring and reacting at a rate of 150r / min for 5h to obtain an intermediate; step 3, placing the intermediate in an oven for drying; step 4, calcining the dried intermediate at 350°C for 4h, and the treated powder is the second component, which is naturally cooled and sealed for storage.

[0036] The method for using the above-mentioned yellowing-resistant and sanding-free two-component rubber treating agent comprises the following steps: step 1, slowly adding the second component into the first component, and continuously stirring to make the second component evenly dispersed in the first component, so as to obtain a two-component rubber treating agent that can be directly used for rubber surface treatment; step 2, selecting an isoprene rubber product to be treated, and evenly coating the two-component rubber treating agent on the surface of the isoprene rubber product, and the coating thickness is controlled to be 0.2 mm; step 3, naturally drying the coated rubber at room temperature, so that the treating agent forms a stable film layer on the rubber surface.

[0037] After the yellowing-resistant and sanding-free two-component rubber treatment agent described in Examples 1 to 5 is applied to the surface of the rubber product, the performance test results are as follows: Bonding strength test: The rubber treated in Examples 1 to 5 is bonded to other materials using a polyurethane adhesive, and the bonded samples are subjected to a tensile strength test according to the tensile test method specified in the national standard GB / T 13936-2014. The test results are shown in Table 1. The results show that the tensile strength of the natural rubber products, chloroprene rubber products, butadiene rubber products, and isoprene rubber products treated by the present invention can reach 2.1 MPa, while the tensile strength of the styrene-butadiene rubber products treated by the present invention is as high as 10 MPa, indicating that the treatment agent can also improve the bonding effect of the adhesive without grinding the rubber material for pretreatment.

[0038] Yellowing resistance test: The rubber products treated by Examples 1 to 5 were placed in an ultraviolet aging test box, and the test conditions were set as 2 15W ultraviolet lamps, a wavelength of 280 to 400 mm, a temperature of 23.0°C, and an irradiation time of 3 hours (equivalent to three months in a container). After the test, the appearance color change of the rubber products was observed, and the relevant test results are shown in Table 1. The results show that the rubber products treated by the treatment agent of the present invention have basically no yellowing phenomenon, reflecting the excellent yellowing resistance of the treatment agent.

[0039] Table 1. Test results of rubber products obtained from Examples 1 to 5 after combining with adhesives Example Rubber Type Second material for bonding Storage time in simulated container (months) Yellowing grade (rated according to industry standards, the larger the number, the better the yellowing resistance) Tensile strength (MPa, combined with corresponding materials) 1 Natural rubber Plastic (PVC) 6 5 2.1 2 Styrene Butadiene Rubber Metal 3 4 10 3 Neoprene leather 4 4 2.3 4 Butadiene rubber TPR 5 5 2.6 5 Isoprene rubber EVA 6 5 2.2

Claims

1. A yellowing-resistant and polish-free two-component rubber treatment agent, characterized in that: The invention comprises a first component and a second component; the first component comprises, by weight, 40-60 parts of modified chloroprene rubber latex, 5-10 parts of silane coupling agent, 2-5 parts of antioxidant, 3-6 parts of light stabilizer, 2-4 parts of defoamer and 3-6 parts of dispersant; the second component is an active filler, which is one of nano-scale alumina-modified silica powder modified by organosilicon or nano-scale silica powder modified by organosilicon; the weight ratio of the first component to the second component is 5:1-10:

1.

2. The yellowing-resistant and polish-free two-component rubber treating agent according to claim 1, characterized in that: The modified chloroprene rubber latex is chloroprene rubber latex modified by grafting with GMA monomer.

3. The yellowing-resistant and polish-free two-component rubber treating agent according to claim 1, characterized in that: The silane coupling agent is one of KH-550, KH-570 and A-151.

4. The yellowing-resistant and polish-free two-component rubber treating agent according to claim 1, characterized in that: The antioxidant is a mixture of a hindered phenol antioxidant and a thioester auxiliary antioxidant.

5. The yellowing-resistant and polish-free two-component rubber treating agent according to claim 1, characterized in that: The light stabilizer is a hindered amine light stabilizer.

6. The yellowing-resistant and polish-free two-component rubber treating agent according to claim 1, characterized in that: The defoamer is a polyether modified silicon defoamer.

7. The yellowing-resistant and polish-free two-component rubber treating agent according to claim 1, characterized in that: The dispersant is an anionic sulfonate.

8. The yellowing-resistant and polish-free two-component rubber treating agent according to claim 1, characterized in that: The preparation method of the first component comprises the following steps: step 1, after cleaning and drying the reactor, adding modified chloroprene rubber latex, starting a stirring device, setting the stirring speed to 300-500r / min, and controlling the temperature in the reactor to be 25-35°C; step 2, slowly adding a silane coupling agent, and continuously stirring for 30-60min, so that the silane coupling agent is fully and evenly dispersed in the modified chloroprene rubber latex; step 3, then adding an antioxidant and a light stabilizer in sequence, stirring for 20-40min after each component is added to ensure that each component is completely dissolved and evenly mixed with each other; step 4, then adding a defoamer and a dispersant, continuing stirring for 30-50min, then stopping stirring, filtering and removing impurities from the obtained first component, putting it into a sealed container, and storing it at room temperature for standby use.

9. The yellowing-resistant and polish-free two-component rubber treating agent according to claim 1, characterized in that: The preparation method of the second component includes the following steps: step 1, adding organic silane to an alcohol solvent to prepare a silane solution with a mass fraction of 1%-5%; step 2, selecting nano-scale alumina-modified silica powder or silica powder as an active filler, and controlling its particle size within the range of 50-200nm, mixing the nano-alumina-modified silica powder or silica powder with the silane solution at a flow rate of 100-400ml / min through a constant flow pump, and stirring the reaction at a rate of 120-150r / min for 4-6h to obtain an intermediate; step 3, placing the intermediate in an oven for drying; step 4, calcining the dried intermediate at 300-500℃ for 2-4h, and the treated powder is the second component, which is sealed and stored for standby after natural cooling.

10. A method for using a yellowing-resistant and sanding-free two-component rubber treatment agent according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: step 1, slowly adding the second component into the first component, and continuously stirring so that the second component is evenly dispersed in the first component, so as to obtain a two-component rubber treating agent that can be directly used for rubber surface treatment; step 2, selecting a rubber product to be treated, and evenly coating the two-component rubber treating agent on the rubber surface, with the coating thickness controlled at 0.1-0.5 mm; step 3, naturally drying the coated rubber at room temperature or drying it in an oven at 50-60° C., so that the treating agent forms a stable film layer on the rubber surface.