Environment-friendly and odorless water-based styrene-butadiene latex applied to carpets and preparation method thereof

Abstract

The invention relates to the technical field of preparation of carpet styrene-butadiene latex, and discloses environment-friendly and odorless water-based styrene-butadiene latex applied to carpets and a preparation method of the environment-friendly and odorless water-based styrene-butadiene latex. The environment-friendly and odorless water-based styrene-butadiene latex applied to the carpet is prepared from the following components in parts by weight: 2 to 8 parts of unsaturated carboxylic acid, 160 parts of styrene, 100 to 200 parts of butadiene, 1 to 6 parts of sodium persulfate, 4 to 8 parts of itaconic acid, 1 to 5 parts of lauryl sodium sulfate, 0.1 to 0.5 part of sodium stearate, 1 to 6 parts of sodium hydroxide aqueous solution, 0.05 to 0.2 part of anti-aging agent, 0.05 to 0.2 part of mildew preventive, 0.05 to 0.2 part of odorless agent and 260 to 360 parts of deionized water. According to the invention, the oxidation resistance, mildew resistance and odorlessness of the carpet latex are improved, so that the carpet latex can maintain stable performance in various environments, and the problem that the traditional latex can release volatile organic compounds in the use process due to the fact that the traditional latex contains a large amount of solvent, so that the indoor air quality is influenced is solved.

Description

Technical Field

[0001] The invention relates to the technical field of carpet styrene butadiene latex preparation, in particular to an environmentally friendly, odorless water-based styrene butadiene latex applied to carpets, and also to a preparation method of the styrene butadiene latex. Background Art

[0002] As people's living standards improve, they have higher and higher requirements for the comfort and health of their living environment. As a common interior decoration material, the impact of latex materials used in the production of carpets on the environment and human health has attracted widespread attention.

[0003] Traditional carpet adhesives mostly use solvent-based adhesives, which contain a large amount of organic solvents, which not only pollute the environment, but also release volatile organic compounds during use, affecting indoor air quality. With the improvement of environmental awareness and the tightening of relevant regulations, it is particularly important to develop an environmentally friendly and odorless water-based latex. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an environmentally friendly, odorless water-based styrene-butadiene latex for carpet and a preparation method thereof to overcome the problem that traditional latex releases volatile organic compounds during use, affecting indoor air quality.

[0005] The invention discloses an environmentally friendly and odor-free water-based styrene-butadiene latex for carpets. The latex is composed of the following components in parts by weight: 2-8 parts of unsaturated carboxylic acid, 160 parts of styrene, 100-200 parts of butadiene, 1-6 parts of sodium persulfate, 4-8 parts of itaconic acid, 1-5 parts of sodium dodecyl sulfate, 0.1-0.5 parts of sodium stearate, 1-6 parts of sodium hydroxide aqueous solution, 0.05-0.2 parts of antioxidant, 0.05-0.2 parts of mildewproofing agent, 0.05-0.2 parts of odor-free agent and 260-360 parts of deionized water.

[0006] As a further improvement of the above scheme, the weight parts of the styrene-butadiene latex are as follows: 3 parts of unsaturated carboxylic acid, 160 parts of styrene, 140 parts of butadiene, 4 parts of sodium persulfate, 6 parts of itaconic acid, 3 parts of sodium lauryl sulfate, 0.35 parts of sodium stearate, 4.5 parts of 12.5% ​​sodium hydroxide aqueous solution, 0.1 parts of antioxidant, 0.1 parts of mildewproofing agent, 0.15 parts of rubber deodorant, and 300 parts of deionized water.

[0007] As a further improvement of the above scheme, a waterproofing agent and a silane quaternary ammonium salt are stirred and mixed in a ratio of 2:3 to obtain the mildew inhibitor; the waterproofing agent has the following composition by weight: 50% octyltriethoxysilane, 40% silicone resin prepolymer, and 10% nonionic surfactant.

[0008] As a further improvement of the above scheme, a waterproofing agent and a silane quaternary ammonium salt are stirred and mixed to obtain the mildew inhibitor, and the specific operation is as follows: Step 1: In a 800ml plastic cup, add 100g of octyl triethoxysilane, 80g of silicone resin prepolymer and 20g of nonionic surfactant and stir evenly, then pour into a high shear emulsifier and mix at 3000rpm; Step 2, adding 300g of deionized water several times, when adding 100g to 200g of water, the emulsion first thickens, and then gradually thins as the amount of water added, and finally adding a buffer solution to make the pH 6.0 to 7.0 to obtain a waterproofing agent emulsion; Step 3: Add silane quaternary ammonium salt to the waterproofing agent emulsion and stir evenly to obtain a mildew preventer. In the present invention, the mildew preventer is added to prevent the growth of mildew, so that when the styrene-butadiene latex is used as a backing adhesive in a carpet, the carpet can be kept clean and beautiful.

[0009] As a further improvement of the above scheme, the polyphenol compound antioxidant and the composite terminator are mixed in a ratio of 10 to 20:1 to obtain the antioxidant, and the composite terminator contains phenothiazine and N, N-dialkylhydroxylamine compounds. In the present invention, the antioxidant and the composite terminator cooperate to produce a good synergistic effect, and the multi-component antioxidant formed by the antioxidant can effectively inhibit the aging process of latex, extend its service life, prevent it from emitting organic matter, and ensure the indoor air quality.

[0010] As a further improvement of the above scheme, the deodorant is composed of the following parts by weight: 1-5 parts of sodium polyacrylate, 5-15 parts of kaolin, 5-15 parts of calcium chloride, 1-3 parts of tetrabutyl titanate, 1-2 parts of citric acid, 1-2 parts of carboxyl-terminated polyamide, and 2-5 parts of plant polyol. In the present invention, the deodorant is added to chelate the low-molecular mixture, directly react with the active group, so that the active group no longer volatilizes into the surrounding environment, and plays a role in reducing and eliminating the odor or odor caused by the residual monomers of the rubber itself.

[0011] A method for preparing styrene-butadiene latex comprises the following steps: S1: Mix styrene, itaconic acid and unsaturated carboxylic acid to obtain a mixed monomer; S2: sodium dodecyl sulfate is prepared to obtain an emulsion with a mass concentration of 1%; S3: Mixing the mixed monomer, the emulsion and butadiene, and causing a polymerization reaction under the action of sodium persulfate to form a polymer; The S4 polymer was aged at 90-92 °C for 1 h, and the polymerization reaction was completed; S5 added sodium stearate and stirred for 5 minutes; S6 cools down to 70-72℃, adds antioxidant, mildew inhibitor and deodorizer dropwise, and stirs for 5 minutes; S7 cooled to 45°C, added sodium hydroxide aqueous solution to adjust the pH to 8.0-9.0, and stirred for 5 min; S8 cools the temperature to 40° C. and filters the material using a 120-mesh screen to obtain the styrene-butadiene latex as claimed in any one of claims 1 to 6.

[0012] As a further improvement of the above scheme, in the mixed monomer, the ratio of styrene, itaconic acid and unsaturated carboxylic acid is 30~55:1~2:1.

[0013] As a further improvement of the above scheme, sodium dodecyl sulfate is dispersed in deionized water and mixed under high-speed stirring at a stirring speed of 1000-1200 r / min until the sodium dodecyl sulfate is completely dissolved to obtain an emulsion. In the present invention, sodium dodecyl sulfate is added as an emulsifier to reduce interfacial tension, so that the monomer is dispersed to form fine droplets, thereby forming a stable emulsified system in the mixed solution.

[0014] As a further improvement of the above scheme, the polymerization reaction is carried out in a reactor, and the mass concentration of sodium persulfate is 0.5%, and sodium persulfate is added as an initiator to initiate the polymerization reaction; the temperature of the polymerization reaction is 80-86° C., and the reaction time is 4.5-7 hours; before adding the materials to the reactor, the reactor is first evacuated and filled with nitrogen, and the process is repeated three times to completely exhaust the oxygen in the reactor; The specific operation of the method for forming a polymer is as follows: S31: 10% of the emulsion, 10% of the mixed monomer and 10% of butadiene were added to the reactor, stirred and mixed for 10 minutes, and then steam was introduced into the reactor to increase the temperature in the reactor to 80°C; S32 Take 15% sodium persulfate and put it into the reactor, mix and react at 80~82℃ for 25min; S33 maintains a temperature of 80-82°C and continues to drop the remaining 90% of the emulsion, 90% of the mixed monomer, 90% of butadiene and 85% of the initiator for 4.5 hours.

[0015] As a further improvement of the above scheme, the mass concentration of the sodium stearate is 0.3%. In the present invention, sodium stearate is added as a stabilizer to increase the charge, protective layer and hydration degree of the surface of the emulsion particles, prevent the early gel precipitation of the emulsion during storage, mechanical operation and compounding of auxiliary agents, thereby ensuring the stability of the emulsion and further extending the shelf life of the styrene-butadiene latex formed by polymerization.

[0016] As a further improvement of the above scheme, the mass concentration of the sodium hydroxide aqueous solution is 12.5%; the solid content of the styrene-butadiene latex is 49% to 50%, and the viscosity is less than 500cp.

[0017] Compared with the prior art, the invention has the following beneficial effects: an antioxidant, a mildewproof agent and a deodorant are added to the traditional styrene-butadiene latex, the antioxidant inhibits the aging process of the latex, prolongs its service life, prevents it from emitting organic matter and affecting the indoor air quality, the mildewproof agent prevents the growth of mold, keeps the carpet clean and beautiful, and the deodorant effectively removes the odor in the latex, improving the environmental performance of the product. The preparation method of the invention is simple and easy to implement, suitable for large-scale production, improves the antioxidant, mildewproof and odor-free properties of the carpet latex, and enables it to maintain stable performance in various environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a flow chart of a method for preparing styrene-butadiene latex provided by the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. Additional aspects and advantages of the present invention will be given in part in the following description, and will become apparent from the following description, or will be understood through the practice of the present invention. It should be understood that the following description is only used to explain the present invention and is not intended to limit the present invention.

[0020] As used herein, the terms "comprises," "including," "contains," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0021] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range limited by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including a range of "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When a numerical range is described in this article, unless otherwise specified, the range is intended to include its end values ​​and all integers and fractions within the range.

[0022] The specific embodiments of the present invention are described in detail below. Example 1

[0023] The present embodiment provides an environmentally friendly, odor-free water-based styrene-butadiene latex for carpet application, which is composed of the following parts by weight: 4 parts of unsaturated carboxylic acid, 160 parts of styrene, 130 parts of butadiene, 4 parts of sodium persulfate, 5 parts of itaconic acid, 4 parts of sodium lauryl sulfate, 0.3 parts of sodium stearate, 4 parts of sodium hydroxide aqueous solution, 0.1 parts of antioxidant, 0.1 parts of mildew inhibitor, 0.15 parts of odor-removing agent, and 290 parts of deionized water.

[0024] Take a waterproofing agent and a silane quaternary ammonium salt and stir them in a ratio of 2:3 to obtain the mildew preventer, wherein the mass fraction of the waterproofing agent is as follows: 50% octyl triethoxy silane, 40% silicone prepolymer, and 10% nonionic surfactant. The preparation process of the mildew preventer is as follows: step 1, in an 800ml plastic cup, add 100g octyl triethoxy silane, 80g silicone prepolymer and 20g nonionic surfactant and stir evenly, then pour into a high shear emulsifier and mix at 3000rpm; step 2, add 300g of deionized water several times, when 100g of water is added, the emulsion first thickens, and finally becomes thinner as the amount of water added, and finally a buffer is added to make the pH 6.0 to obtain a waterproofing agent emulsion; step 3, add silane quaternary ammonium salt to the waterproofing agent emulsion, stir evenly, and obtain a mildew preventer.

[0025] The antioxidant is obtained by mixing a polyphenol compound antioxidant and a composite terminator in a ratio of 10:1, wherein the composite terminator contains phenothiazine and N,N-dialkylhydroxylamine compounds. The deodorant is composed of the following parts by weight: 1 part of sodium polyacrylate, 5 parts of kaolin, 5 parts of calcium chloride, 1 part of tetrabutyl titanate, 1 part of citric acid, 1 part of terminal carboxyl polyamide, and 2 parts of plant polyols.

[0026] The styrene-butadiene latex of the present embodiment, its preparation process is as follows: First, 160 parts of styrene, 5 parts of itaconic acid and 4 parts of unsaturated carboxylic acid were mixed to obtain a mixed monomer for use, 4 parts of sodium dodecyl sulfate were dispersed in 290 parts of deionized water, and mixed under high-speed stirring at a stirring speed of 1100 r / min until the sodium dodecyl sulfate was completely dissolved to obtain an emulsion for use.

[0027] Next, 10% of the emulsion, 10% of the mixed monomers and 13 parts of butadiene were added to the reactor. After stirring and mixing for 10 minutes, steam was introduced into the reactor and the temperature in the reactor was raised to 80°C. Then, 0.6 parts of sodium persulfate were added to the reactor. After mixing and reacting at 80°C for 25 minutes, the temperature was maintained at 80°C, and the remaining emulsion, the remaining mixed monomers, 117 parts of butadiene and 3.4 parts of sodium persulfate were continued to be added dropwise for 4.5 hours. The polymer was matured at 90°C for 1 hour, and the polymerization reaction was completed.

[0028] Then, add 0.3 parts of sodium stearate, stir and mix for 5 minutes, cool to 70°C, add 0.1 parts of antioxidant, 0.1 parts of mildew inhibitor and 0.15 parts of deodorant dropwise in sequence, stir and mix for 5 minutes, cool to 45°C, add 4 parts of sodium hydroxide aqueous solution to adjust the pH to 8.43, stir for 5 minutes, cool to 40°C, and finally filter the material through a 120-mesh sieve to obtain styrene-butadiene latex. Example 2

[0029] The present embodiment provides an environmentally friendly, odor-free water-based styrene-butadiene latex for carpet application, which is composed of the following parts by weight: 3 parts of unsaturated carboxylic acid, 160 parts of styrene, 140 parts of butadiene, 4 parts of sodium persulfate, 6 parts of itaconic acid, 3 parts of sodium dodecyl sulfate, 0.35 parts of sodium stearate, 4.5 parts of sodium hydroxide aqueous solution, 0.1 parts of antioxidant, 0.1 parts of mildewproofing agent, 0.15 parts of odor-removing agent, and 300 parts of deionized water.

[0030] Take a waterproofing agent and a silane quaternary ammonium salt and stir them in a ratio of 2:3 to obtain the mildew preventer, wherein the mass fraction of the waterproofing agent is as follows: 50% octyl triethoxy silane, 40% silicone prepolymer, and 10% nonionic surfactant. The preparation process of the mildew preventer is as follows: step 1, in an 800ml plastic cup, add 100g octyl triethoxy silane, 80g silicone prepolymer and 20g nonionic surfactant and stir evenly, then pour into a high shear emulsifier and mix at 3000rpm; step 2, add 300g of deionized water several times, when 150g of water is added, the emulsion first thickens, and finally becomes thinner as the amount of water added, and finally a buffer is added to make the pH 6.5 to obtain a waterproofing agent emulsion; step 3, add silane quaternary ammonium salt to the waterproofing agent emulsion, stir evenly, and obtain a mildew preventer.

[0031] The antioxidant is obtained by mixing a polyphenol compound antioxidant and a composite terminator in a ratio of 15:1, wherein the composite terminator contains phenothiazine and N,N-dialkylhydroxylamine compounds. The deodorant is composed of the following parts by weight: 3 parts of sodium polyacrylate, 10 parts of kaolin, 10 parts of calcium chloride, 2 parts of tetrabutyl titanate, 1 part of citric acid, 2 parts of terminal carboxyl polyamide, and 4 parts of plant polyols.

[0032] The styrene-butadiene latex of the present embodiment, its preparation process is as follows: First, 160 parts of styrene, 6 parts of itaconic acid and 3 parts of unsaturated carboxylic acid are mixed to obtain a mixed monomer for use, 3 parts of sodium dodecyl sulfate are dispersed in 300 parts of deionized water, and mixed under high-speed stirring at a stirring speed of 1100 r / min until the sodium dodecyl sulfate is completely dissolved to obtain an emulsion for use.

[0033] Next, 10% of the emulsion, 10% of the mixed monomers and 14 parts of butadiene were added to the reactor. After stirring and mixing for 10 minutes, steam was introduced into the reactor and the temperature in the reactor was raised to 80°C. Then, 0.6 parts of sodium persulfate were added to the reactor. After mixing and reacting at 80°C for 25 minutes, the temperature was maintained at 80°C, and the remaining emulsion, the remaining mixed monomers, 126 parts of butadiene and 3.4 parts of sodium persulfate were continued to be added dropwise for 4.5 hours. The polymer was matured at 90°C for 1 hour, and the polymerization reaction was completed.

[0034] Then, add 0.35 parts of sodium stearate, stir and mix for 5 minutes, cool to 70°C, add 0.1 parts of antioxidant, 0.1 parts of mildew inhibitor and 0.15 parts of deodorant dropwise in sequence, stir and mix for 5 minutes, cool to 45°C, add 4.5 parts of sodium hydroxide aqueous solution to adjust the pH to 8.5, stir for 5 minutes, cool to 40°C, and finally filter the material through a 120-mesh sieve to obtain styrene-butadiene latex. Example 3

[0035] The present embodiment provides an environmentally friendly, odor-free water-based styrene-butadiene latex for carpet application, which is composed of the following parts by weight: 5 parts of unsaturated carboxylic acid, 160 parts of styrene, 150 parts of butadiene, 5 parts of sodium persulfate, 6 parts of itaconic acid, 4 parts of sodium lauryl sulfate, 0.35 parts of sodium stearate, 5 parts of sodium hydroxide aqueous solution, 0.1 parts of antioxidant, 0.1 parts of mildew inhibitor, 0.15 parts of odor-removing agent, and 310 parts of deionized water.

[0036] Take a waterproofing agent and a silane quaternary ammonium salt and stir them in a ratio of 2:3 to obtain the mildew preventer, wherein the mass fraction of the waterproofing agent is as follows: 50% octyl triethoxy silane, 40% silicone prepolymer, and 10% nonionic surfactant. The preparation process of the mildew preventer is as follows: step 1, in an 800ml plastic cup, add 100g octyl triethoxy silane, 80g silicone prepolymer and 20g nonionic surfactant and stir evenly, then pour into a high shear emulsifier and mix at 3000rpm; step 2, add 300g of deionized water several times, when adding 200g of water, the emulsion first thickens, and finally becomes thinner as the amount of water added, and finally adds a buffer solution to make the pH 7.0 to obtain a waterproofing agent emulsion; step 3, add silane quaternary ammonium salt to the waterproofing agent emulsion, stir evenly, and obtain a mildew preventer.

[0037] The antioxidant is obtained by mixing a polyphenol compound antioxidant and a composite terminator in a ratio of 20:1, wherein the composite terminator contains phenothiazine and N,N-dialkylhydroxylamine compounds. The deodorant is composed of the following parts by weight: 5 parts of sodium polyacrylate, 15 parts of kaolin, 15 parts of calcium chloride, 3 parts of tetrabutyl titanate, 2 parts of citric acid, 2 parts of carboxyl-terminated polyamide, and 5 parts of plant polyols.

[0038] The styrene-butadiene latex of the present embodiment, its preparation process is as follows: First, 160 parts of styrene, 6 parts of itaconic acid and 5 parts of unsaturated carboxylic acid were mixed to obtain a mixed monomer for use, 4 parts of sodium dodecyl sulfate were dispersed in 310 parts of deionized water, and mixed under high-speed stirring at a stirring speed of 1100 r / min until the sodium dodecyl sulfate was completely dissolved to obtain an emulsion for use.

[0039] Next, 10% of the emulsion, 10% of the mixed monomer and 15 parts of butadiene were added to the reactor. After stirring and mixing for 10 minutes, steam was introduced into the reactor and the temperature in the reactor was raised to 80°C. Then, 0.75 parts of sodium persulfate were added to the reactor. After mixing and reacting at 80°C for 25 minutes, the temperature was maintained at 80°C, and the remaining emulsion, the remaining mixed monomer, 135 parts of butadiene and 4.25 parts of sodium persulfate were continued to be added dropwise for 4.5 hours. The polymer was matured at 90°C for 1 hour, and the polymerization reaction was completed.

[0040] Then, add 0.35 parts of sodium stearate, stir and mix for 5 minutes, cool to 70°C, add 0.1 parts of antioxidant, 0.1 parts of mildew inhibitor and 0.15 parts of deodorant dropwise in sequence, stir and mix for 5 minutes, cool to 45°C, add 4 parts of sodium hydroxide aqueous solution to adjust the pH to 8.47, stir for 5 minutes, cool to 40°C, and finally filter the material through a 120-mesh sieve to obtain styrene-butadiene latex.

[0041] The following is a VOC content test and wet peel strength test of a commercially available latex as a comparative example and the latex of Examples 1 to 3. The specific test process is not repeated here. The test results are: the VOC content of the comparative example is less than 20ppm, and the wet peel strength is 9.4N; the VOC content of Example 1 is less than 2ppm, and the wet peel strength is 12N; the VOC content of Example 2 is less than 2ppm, and the wet peel strength is 14N; the VOC content of Example 3 is less than 2ppm, and the wet peel strength is 13.6N. The above results prove that the emulsion of the present invention is within the index control range, and at the same time improves the peel resistance of the carpet latex, so that it can maintain stable performance under various environments, and the content of volatile organic compounds is significantly reduced, which overcomes the problem that the traditional latex contains a large amount of solvents and releases volatile organic compounds during use, affecting the indoor air quality. Example 4

[0042] See also Figure 1 The present embodiment provides a method for preparing styrene-butadiene latex, which comprises the following steps: S1: taking styrene, itaconic acid and unsaturated carboxylic acid and mixing them to obtain a mixed monomer, wherein the ratio of styrene, itaconic acid and unsaturated carboxylic acid in the mixed monomer is 30-55:1-2:1.

[0043] S2: Sodium dodecyl sulfate is dispersed in deionized water and mixed under high-speed stirring at a stirring speed of 1000-1200 r / min until the sodium dodecyl sulfate is completely dissolved to obtain an emulsion with a mass concentration of 1%. In this embodiment, sodium dodecyl sulfate is added as an emulsifier to reduce interfacial tension, so that the monomer is dispersed to form fine droplets, so that the mixed solution forms a stable emulsified system.

[0044] S3: Mix the mixed monomer, emulsion and butadiene, and cause a polymerization reaction under the action of sodium persulfate to form a polymer. The polymerization reaction is carried out in a reactor, and the mass concentration of sodium persulfate is 0.5%. In this embodiment, sodium persulfate is added as an initiator to initiate the polymerization reaction.

[0045] The polymerization reaction temperature is 80-86° C., and the reaction time is 4.5-7 hours. Before adding materials into the reactor, the reactor is first evacuated and filled with nitrogen, and this process is repeated three times to completely exhaust the oxygen in the reactor.

[0046] The specific operation of the method for forming a polymer is as follows: S31 Take 10% of the emulsion, 10% of the mixed monomer and 10% of butadiene and add them into the reactor. After stirring and mixing for 10 minutes, steam is introduced into the reactor and the temperature in the reactor is increased to 80°C.

[0047] S32: 15% sodium persulfate was added into the reactor and mixed and reacted at 80-82°C for 25 minutes.

[0048] S33 maintains a temperature of 80-82°C and continues to drop the remaining 90% of the emulsion, 90% of the mixed monomer, 90% of butadiene and 85% of the initiator for 4.5 hours.

[0049] The S4 polymer was aged at 90-92°C for 1 h, and the polymerization reaction was completed.

[0050] S5 adds sodium stearate with a mass concentration of 0.3%, and stirs and mixes for 5 minutes. In this embodiment, sodium stearate is added as a stabilizer to increase the charge, protective layer and hydration degree of the surface of the emulsion particles, prevent the early gel precipitation of the emulsion during storage, mechanical operation and auxiliary agent preparation, thereby ensuring the stability of the emulsion and extending the shelf life of the styrene-butadiene latex formed by polymerization.

[0051] S6 cools down to 70~72℃, adds antioxidant, mildew inhibitor and deodorizer in sequence, and stirs and mixes for 5 minutes.

[0052] S7 was cooled to 45°C, and a 12.5% ​​sodium hydroxide aqueous solution was added to adjust the pH to 8.0-9.0, and stirred for 5 min.

[0053] S8 cools down to 40°C, and uses a 120-mesh screen to filter out the material, thereby obtaining styrene-butadiene latex with a solid content of 49% to 50% and a viscosity of less than 500 cp.

[0054] The above embodiments are merely preferred implementations of the present invention. Any simple modification, amendment and substitution of the above embodiments based on the technical essence of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. An environmentally friendly, odorless water-based styrene-butadiene latex for carpets, characterized in that: The styrene-butadiene latex is composed of the following components in parts by weight: 2-8 parts of unsaturated carboxylic acid, 160 parts of styrene, 100-200 parts of butadiene, 1-6 parts of sodium persulfate, 4-8 parts of itaconic acid, 1-5 parts of sodium lauryl sulfate, 0.1-0.5 parts of sodium stearate, 1-6 parts of sodium hydroxide aqueous solution, 0.05-0.2 parts of antioxidant, 0.05-0.2 parts of mildewproofing agent, 0.05-0.2 parts of deodorizing agent, and 260-360 parts of deionized water.

2. The environmentally friendly, odorless water-based styrene-butadiene latex for carpets according to claim 1, characterized in that: The styrene-butadiene latex is composed of the following parts by weight: 3 parts of unsaturated carboxylic acid, 160 parts of styrene, 140 parts of butadiene, 4 parts of sodium persulfate, 6 parts of itaconic acid, 3 parts of sodium lauryl sulfate, 0.35 parts of sodium stearate, 4.5 parts of 12.5% ​​sodium hydroxide aqueous solution, 0.1 parts of antioxidant, 0.1 parts of mildewproofing agent, 0.15 parts of rubber deodorant, and 300 parts of deionized water.

3. The environmentally friendly, odorless water-based styrene-butadiene latex for carpets according to claim 1, characterized in that: Take a waterproofing agent and a silane quaternary ammonium salt and stir and mix them in a ratio of 2:3 to obtain the mildew inhibitor; The waterproofing agent has the following composition by weight: 50% of octyltriethoxysilane, 40% of silicone resin prepolymer, and 10% of nonionic surfactant.

4. The environmentally friendly, odorless water-based styrene-butadiene latex for carpets according to claim 3, characterized in that: The waterproofing agent and the silane quaternary ammonium salt are stirred and mixed to obtain the mildew inhibitor, and the specific operation is as follows: Step 1: In a 800ml plastic cup, add 100g of octyl triethoxysilane, 80g of silicone resin prepolymer and 20g of nonionic surfactant and stir evenly, then pour into a high shear emulsifier and mix at 3000rpm; Step 2, adding 300g of deionized water several times, when adding 100g to 200g of water, the emulsion first thickens, and then gradually thins as the amount of water added, and finally adding a buffer solution to make the pH 6.0 to 7.0 to obtain a waterproofing agent emulsion; Step 3: Add silane quaternary ammonium salt to the waterproofing agent emulsion, stir evenly, and obtain a mildew preventer.

5. The environmentally friendly, odorless water-based styrene-butadiene latex for carpets according to claim 1, characterized in that: The polyphenol compound antioxidant and the composite terminator are mixed in a ratio of 10-20:1 to obtain the antioxidant, and the composite terminator contains phenothiazine and N,N-dialkylhydroxylamine compounds.

6. The environmentally friendly, odorless water-based styrene-butadiene latex for carpets according to claim 1, characterized in that: The deodorant is composed of the following parts by weight: 1-5 parts of sodium polyacrylate, 5-15 parts of kaolin, 5-15 parts of calcium chloride, 1-3 parts of tetrabutyl titanate, 1-2 parts of citric acid, 1-2 parts of carboxyl-terminated polyamide, and 2-5 parts of plant polyol.

7. A method for preparing styrene-butadiene latex, characterized in that: The following steps are involved: S1: Mix styrene, itaconic acid and unsaturated carboxylic acid to obtain a mixed monomer; S2: sodium dodecyl sulfate is prepared to obtain an emulsion with a mass concentration of 1%; S3: Mixing the mixed monomer, the emulsion and butadiene, and causing a polymerization reaction under the action of sodium persulfate to form a polymer; The S4 polymer was aged at 90-92 °C for 1 h, and the polymerization reaction was completed; S5 added sodium stearate and stirred for 5 minutes; S6 cools down to 70-72℃, adds antioxidant, mildew inhibitor and deodorizer dropwise, and stirs for 5 minutes; S7 cooled to 45°C, added sodium hydroxide aqueous solution to adjust the pH to 8.0-9.0, and stirred for 5 min; S8 cools the temperature to 40° C. and filters the material using a 120-mesh screen to obtain the styrene-butadiene latex as claimed in any one of claims 1 to 6.

8. The method for preparing styrene-butadiene latex according to claim 7, characterized in that: In the mixed monomer, the ratio of styrene, itaconic acid and unsaturated carboxylic acid is 30-55:1-2:1; Sodium dodecyl sulfate is dispersed in deionized water and mixed under high-speed stirring at a speed of 1000-1200 r / min until the sodium dodecyl sulfate is completely dissolved to obtain an emulsion.

9. The method for preparing styrene-butadiene latex according to claim 8, characterized in that: The polymerization reaction is carried out in a reactor, and the mass concentration of sodium persulfate is 0.5%; the temperature of the polymerization reaction is 80-86° C., and the reaction time is 4.5-7 hours; before adding materials to the reactor, the reactor is first evacuated and filled with nitrogen, and the process is repeated three times to completely exhaust the oxygen in the reactor; The specific operation of the method for forming a polymer is as follows: S31: 10% of the emulsion, 10% of the mixed monomer and 10% of butadiene were added to the reactor, stirred and mixed for 10 minutes, and then steam was introduced into the reactor to increase the temperature in the reactor to 80°C; S32 Take 15% sodium persulfate and put it into the reactor, mix and react at 80~82℃ for 25min; S33 maintains a temperature of 80-82°C and continues to drop the remaining 90% of the emulsion, 90% of the mixed monomer, 90% of butadiene and 85% of the initiator for 4.5 hours.

10. The method for preparing styrene-butadiene latex according to claim 9, characterized in that: The mass concentration of the sodium stearate is 0.3%; The mass concentration of the sodium hydroxide aqueous solution is 12.5%; the solid content of the styrene-butadiene latex is 49% to 50% and the viscosity is less than 500cp.

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