High-gum-performance styrene-butadiene latex raw material composition for carpet and preparation method of high-gum-performance styrene-butadiene latex raw material composition

Abstract

The invention provides a styrene-butadiene latex raw material composition for a carpet with high gum performance. The styrene-butadiene latex raw material composition comprises the following components in parts by weight: 60-70 parts of butadiene, 90-110 parts of styrene, 5-15 parts of acrylic acid, 15-25 parts of mercaptan and 3-10 parts of carbamate. The preparation method of the high-gum-performance styrene-butadiene latex for the carpet by adopting the raw material composition comprises the following steps: adding butadiene, styrene, acrylic acid, mercaptan and carbamate into a reactor, fully mixing, then adding an initiator, carrying out a free radical polymerization reaction, and separating and removing impurities after the reaction is finished, thereby obtaining the high-gum-performance styrene-butadiene latex for the carpet. The mercaptan, the carbamate and the like are added into the styrene-butadiene latex raw materials, so that the adhesion and the water resistance of the latex can be improved, the stripping force and the pulling force of the latex are remarkably improved, the stability of the latex under extreme conditions is effectively improved, the use performance of a carpet is improved, and the application range of the latex is expanded.

Description

Technical Field

[0001] The invention relates to the technical field of styrene butadiene latex preparation, in particular to a styrene butadiene latex raw material composition for carpets with high backing performance and a preparation method thereof. Background Art

[0002] In modern home and commercial environments, carpets are important decorative materials and are widely used in homes, offices, hotels and other places. Carpets not only provide a comfortable feel, but also have multiple functions such as sound insulation, heat preservation, and decoration. Therefore, the quality and performance of carpets directly affect the user experience and satisfaction. The performance of carpets, especially the performance of their adhesive backing, determines whether the carpet can be firmly adhered to the ground after laying, which in turn affects the service life and maintenance cost of the carpet.

[0003] Traditional carpet adhesive mainly uses styrene butadiene latex, which has good adhesion and durability. However, with the continuous increase in market demand, traditional styrene butadiene latex can no longer meet the requirements of the modern carpet industry in some aspects. For example, traditional latex has certain limitations in terms of performance such as anti-cracking, peeling force and pulling force. Especially in extreme environments such as high temperature and high humidity, its performance may decline, causing the carpet to fall off or warp. Therefore, it is particularly important to develop new, high-performance carpet latex.

[0004] In order to improve the performance of carpet latex, researchers began to explore various modification methods. Among them, adding functional monomers and additives is a commonly used modification method. Functional monomers can react chemically with the main components of styrene butadiene latex to form a cross-linked structure, thereby improving the mechanical strength and weather resistance of the latex. In addition, suitable additives can improve the fluidity, anti-aging properties and other physical and chemical properties of the latex. Therefore, how to reasonably select and proportion functional monomers and additives has become the key to improving the performance of carpet styrene butadiene latex. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a styrene butadiene latex raw material composition for carpets with high adhesive performance, and a method for preparing styrene butadiene latex for carpets with high adhesive performance by using the raw material composition, so as to solve the above technical problems existing in the prior art.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] A styrene-butadiene latex raw material composition for a carpet with high adhesive performance comprises the following components in parts by weight: 60-70 parts of butadiene, 90-110 parts of styrene, 5-15 parts of acrylic acid, 3-10 parts of carbamate and 15-25 parts of mercaptan.

[0008] The carbamate has the following general formula: NH2COOR1, wherein R1 is a C2-C6 alkenyl group. The C2-C6 alkenyl group includes an alkenyl group with a straight chain structure or a branched structure, such as but not limited to vinyl, 1-propenyl, 2-propenyl, 2-butenyl, 1-pentenyl, 3-methyl-1butenyl, and 3-hexenyl.

[0009] Preferably, the carbamate has the following general formula: NH2COOCH=CR1', wherein R1' is H or C1-C4 alkyl. Further preferably, the carbamate is selected from vinyl carbamate (structural formula: NH2COOCH=CH2) and 1-propylene carbamate (structural formula: NH2COOCH=C-CH3).

[0010] The thiol has the following general formula: R2SH, wherein R2 is a C2-C6 alkenyl group. The C2-C6 alkenyl group includes an alkenyl group with a straight chain structure or a branched structure, such as but not limited to vinyl, 1-propenyl, 2-propenyl, 2-butenyl, 1-pentenyl, 3-methyl-1butenyl, and 3-hexenyl.

[0011] Preferably, the thiol is selected from 2-propylene-1-thiol (structural formula: CH2=CHCH2-SH), 3-butene-1-thiol (structural formula: CH2=CHCH2CH2-SH), and 4-pentene-1-thiol (structural formula: CH2=CHCH2CH2CH2-SH).

[0012] Preferably, the styrene-butadiene latex raw material composition for the adhesive-backed carpet also includes a functional additive, which is selected from one or more of polyvinyl alcohol, polyurethane elastomer, antioxidant, and thickener. Among them, polyvinyl alcohol can improve the fluidity and processing performance of latex, making the latex more convenient in the application process; polyurethane elastomer has excellent properties such as high strength, good toughness, wear resistance, and oil resistance, which improves the application effect of latex; antioxidants can improve the anti-aging performance of latex and show better durability; thickeners can increase the viscosity of latex and facilitate construction operations. The functional additive is selected according to actual use needs, and the amount added can be adjusted according to different actual application indicators of the product. The usual amount added is 1-5 parts by weight.

[0013] As a further preferred technical solution, the functional additives are polyvinyl alcohol and antioxidants.

[0014] Preferably, the molecular weight of the polyvinyl alcohol is 25,000-35,000, and the alcoholysis degree is 80-90%.

[0015] Preferably, the antioxidant is an environmentally friendly antioxidant, such as but not limited to antioxidant 1010, antioxidant 1076, antioxidant 264, etc.

[0016] The present invention further provides a method for preparing styrene butadiene latex for carpets with high adhesive performance, which adopts the above-mentioned styrene butadiene latex raw material composition for carpets with high adhesive performance, comprising the following steps: adding butadiene, styrene, acrylic acid, thiol and carbamate into a reactor and mixing them fully, then adding an initiator, heating to a reaction temperature of 60-80°C, and reacting for 2-4 hours; after the reaction is completed, separating and removing impurities to obtain the styrene butadiene latex for carpets with high adhesive performance.

[0017] The inventors have found that by adding mercaptan and carbamate to the styrene butadiene latex monomer raw material composition and obtaining a modified styrene butadiene latex through free radical polymerization, the modified styrene butadiene latex unexpectedly has excellent anti-stripping, anti-clustering and anti-cracking properties, and has good durability, and is suitable for use in relatively harsh scenarios, thereby improving the quality of carpet products. Based on the above findings, the inventors have completed the present invention.

[0018] The initiator is not particularly limited, and can be an initiator commonly used in the art, such as a peroxide initiator, an azo initiator, etc., including but not limited to ammonium persulfate, azobisisobutyronitrile or benzoyl peroxide. The amount of the initiator added does not need to be particularly limited, and can be obtained through routine experiments based on the type and amount of the monomer combined with the reaction temperature, the specific type of the initiator, etc., and is usually 0.1-0.5% of the total mass of the monomer.

[0019] Preferably, the functional additive is added after the separation and impurity removal part; when the functional additive includes polyvinyl alcohol, the polyvinyl alcohol is added before the initiator, and other functional additives are added after the separation and impurity removal step.

[0020] The reaction temperature is preferably 65-75°C. In this temperature range, the conversion rate of the reaction is the highest and the generation of by-products is the least.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The invention can improve the adhesion and water resistance of latex by adding acrylic acid and mercaptan to styrene-butadiene latex, and significantly improve the stripping force and clustering force of latex. As a functional monomer, carbamate can improve the weather resistance and heat resistance of the product, and effectively improve the stability of latex under extreme conditions. In addition, polyvinyl alcohol can improve the fluidity and processing performance of latex, making the latex more convenient in the application process. DETAILED DESCRIPTION

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only used as examples, but are not used to limit the scope of the present invention. Those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalent solutions, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0024] The instruments or raw materials in the present invention without indicating the manufacturer are all conventional commercial instruments or raw materials.

[0025] Unless otherwise mentioned, the detection indicators involved in the embodiments of the invention are detected by conventional detection methods in the art.

[0026] Example 1

[0027] The composition of the raw materials used is as follows: 60 parts of butadiene, 100 parts of styrene, 10 parts of acrylic acid, 20 parts of 2-propylene-1-thiol, 5 parts of vinyl carbamate, 3 parts of polyvinyl alcohol and 1 part of antioxidant. After mixing these raw materials in a reactor, they are heated to 60°C and kept stirring for 30 minutes to ensure sufficient mixing. Then, 0.1wt% of the total monomer amount of ammonium persulfate is added as an initiator, and the temperature is raised to 70°C for polymerization reaction, which lasts for 2 hours. After post-treatment, the obtained emulsion shows good performance in the peeling force and clustering force test, and is suitable for practical application of carpets.

[0028] Example 2

[0029] In view of the requirements of low temperature environment, the latex of this embodiment is prepared. The ratio of the raw materials used is 55 parts of butadiene, 95 parts of styrene, 12 parts of acrylic acid, 25 parts of 3-butene-1-thiol, 6 parts of 1-propylene carbamate, 4 parts of polyvinyl alcohol and 1 part of antioxidant. Under low temperature environment, the reaction temperature is controlled at 50°C for mixing, and then emulsion polymerization is carried out, and 0.1wt% of ammonium persulfate of the total monomer amount is added as an initiator, the temperature is raised to 65°C, and the reaction time is extended to 3 hours. After post-treatment and performance testing, the latex has obvious advantages in anti-cracking performance and is particularly suitable for carpet applications in cold climate conditions.

[0030] Example 3

[0031] Increase the amount of antioxidant to improve anti-aging performance. The specific raw material composition includes 60 parts of butadiene, 100 parts of styrene, 10 parts of acrylic acid, 20 parts of 4-pentene-1-thiol, 5 parts of vinyl carbamate, 2 parts of polyvinyl alcohol and 2 parts of antioxidant. In the preparation process, all the raw materials are mixed and stirred at 60°C for 30 minutes, and then emulsion polymerization is carried out. Ammonium persulfate with a total monomer content of 0.1wt% is added as an initiator, and the temperature is maintained at 70°C for 3 hours. During post-treatment, impurities are removed by cooling and centrifugation. The test results show that the latex shows excellent durability in aging experiments and is suitable for carpet products for long-term use.

[0032] Example 4

[0033] An environmentally friendly latex is prepared. In the formula of this embodiment, the specific raw materials are 60 parts of butadiene, 95 parts of styrene, 10 parts of acrylic acid, 20 parts of 2-propylene-1-thiol, 5 parts of 1-propylene carbamate, 3 parts of polyvinyl alcohol and 1 part of antioxidant. All the raw materials are mixed uniformly at 60°C, and 0.1wt% of ammonium persulfate of the total monomer amount is added as an initiator, and the temperature is raised to 70°C for polymerization, and the reaction time is controlled to be 2 hours. During post-processing, ensure that the pH value of the product is within an appropriate range, and perform strict filtration.

[0034] Example 5

[0035] A functional reinforced latex was prepared, the raw material composition includes 65 parts of butadiene, 90 parts of styrene, 15 parts of acrylic acid, 20 parts of 4-pentene-1-thiol, 5 parts of 1-propylene carbamate, 3 parts of polyvinyl alcohol and 2 parts of functional additives. After the raw materials are mixed in proportion, they are fully stirred and heated to 60°C, and then 0.1wt% of ammonium persulfate as an initiator is added to the total monomer amount, and emulsion polymerization is carried out, the temperature is raised to 75°C, and the reaction time is 3 hours. During post-processing, the fluidity and stability of the product are ensured.

[0036] Comparative Examples 1-4

[0037] Compared with Example 4, Comparative Example 1 did not add carbamate and mercaptan, Comparative Example 2 did not add carbamate, Comparative Example 3 did not add mercaptan, and Comparative Example 4 reduced the amount of mercaptan by half to examine the effects of each component on product performance. The specific formulas of each comparative example are shown in Table 1, and the unlisted components and their amounts, as well as the process conditions, are the same as those of Example 4.

[0038] Table 1 Comparative Examples Main Formula Comparison Table

[0039] Carbamate dosage Thiol dosage Example 4 5 servings 20 servings Comparative Example 1 0 copies 0 copies Comparative Example 2 0 copies 20 servings Comparative Example 3 5 servings 0 copies Comparative Example 4 5 servings 10 servings

[0040] Application Examples

[0041] The samples prepared in Examples 1-5 and Comparative Examples 1-4 were used as adhesive layers during carpet processing, and the extruded intermediate adhesive layer was bonded to the upper carpet surface and the lower non-woven fabric layer at high temperature through an extrusion laminating machine, and then cooled to room temperature through a cooling roller, thereby obtaining the final carpet samples, which were numbered E1-E5 and D1-D4, respectively. The extrusion processing temperature of the adhesive layer was 210° C., the temperature of the cooling roller was 30° C., and the line speed of the extrusion laminating machine was 12 m / min.

[0042] The following tests were performed on the carpet samples prepared in each embodiment and comparative example:

[0043] 1. Peel force test

[0044] GB / T 26843-2011 “Determination of peel strength of carpet backing” is adopted.

[0045] 2. Cluster pulling force test

[0046] QB / T 1090-2019 "Determination of Carpet Tuft Pull-out Force" is adopted.

[0047] The specific test results are shown in Table 2.

[0048] Table 2 Sample test data

[0049]

[0050] It can be seen from the test results that the embodiments of the present invention have better contribution to the stripping force and cluster pulling force for the finished carpet than the comparative examples. Compared with the comparative example 1 in which no carbamate and thiol are added to the monomer composition, the stripping force of the corresponding carpet sample (E4 compared to D1) of the embodiment 4 is increased by 31.8%, and the cluster pulling force is increased by 25.0%, while the stripping force and cluster pulling force of the corresponding carpet samples (D2 and D3) of the comparative example 2 in which thiol is added but no carbamate is added, and the comparative example 3 in which carbamate is added but no thiol is added, are not significantly changed compared with D1, indicating that the carbamate and thiol in the styrene-butadiene latex raw material composition of the present invention have a significant synergistic effect.

[0051] It should be understood by those skilled in the art that the above embodiments are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A styrene-butadiene latex raw material composition for carpets with high adhesive performance, characterized in that: The invention comprises the following components in parts by weight: 60-70 parts of butadiene, 90-110 parts of styrene, 5-15 parts of acrylic acid, 15-25 parts of thiol, and 3-10 parts of carbamate; the carbamate has the following general formula: NH2COOR1, wherein R1 is a C2-C6 alkenyl group; the thiol has the following general formula: R2SH, wherein R2 is a C2-C6 alkenyl group.

2. The styrene-butadiene latex raw material composition for high adhesive performance carpet according to claim 1, characterized in that: The C2-C6 alkenyl group includes an alkenyl group with a straight chain structure or a branched structure, such as but not limited to vinyl, 1-propenyl, 2-propenyl, 2-butenyl, 1-pentenyl, 3-methyl-1butenyl, and 3-hexenyl.

3. The styrene-butadiene latex raw material composition for high adhesive performance carpet according to claim 1, characterized in that: The carbamate has the following general formula: NH2COOCH=CR1', wherein R1' is H or C1-C4 alkyl.

4. The styrene-butadiene latex raw material composition for high adhesive performance carpet according to claim 1, characterized in that: The carbamate is selected from vinyl carbamate and 1-propylene carbamate.

5. The styrene-butadiene latex raw material composition for high adhesive performance carpet according to claim 1, characterized in that: The mercaptan is selected from 2-propylene-1-thiol, 3-butene-1-thiol, and 4-pentene-1-thiol.

6. The styrene-butadiene latex raw material composition for high adhesive performance carpet according to claim 1, characterized in that: It also includes a functional additive, which is selected from one or more of polyvinyl alcohol, polyurethane elastomer, antioxidant, and thickener.

7. The styrene-butadiene latex raw material composition for high adhesive performance carpet according to claim 6, characterized in that: The functional additives are polyvinyl alcohol and antioxidants.

8. A method for preparing styrene butadiene latex for carpet with high adhesive performance, using the styrene butadiene latex raw material composition for carpet with high adhesive performance according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: adding butadiene, styrene, acrylic acid, carbamate and mercaptan into a reactor and mixing them thoroughly, then adding an initiator, heating the reactor to a reaction temperature of 60-80°C, and reacting for 2-4 hours; and separating and removing impurities after the reaction to obtain the styrene-butadiene latex for the carpet with high adhesive backing performance.

9. The method according to claim 8, characterized in that The initiator is selected from at least one of ammonium persulfate, azobisisobutyronitrile or benzoyl peroxide.

10. The method according to claim 8, characterized in that The functional auxiliary agent is added after the impurity-removing part is separated; when the functional auxiliary agent includes polyvinyl alcohol, the polyvinyl alcohol is added before the initiator is added.

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