Polyvinyl chloride foamed composition and polyvinyl chloride artificial leather

Abstract

Disclosed are a polyvinyl chloride foaming composition and a polyvinyl chloride artificial leather. The polyvinyl chloride foaming composition comprises: a polyvinyl chloride resin, a plasticizer, and a modified inorganic chemical foaming agent, wherein the polyvinyl chloride foaming composition contains 1.5-3.5 parts of the modified inorganic chemical foaming agent based on 100 parts by weight of the total weight of the polyvinyl chloride resin and the plasticizer. The polyvinyl chloride artificial leather comprises a polyvinyl chloride foaming layer prepared from the polyvinyl chloride foaming composition. The polyvinyl chloride foaming layer is prepared by adjusting the type and amount of the foaming agent, so that the performance of the polyvinyl chloride artificial leather is improved. The prepared polyvinyl chloride artificial leather has the advantages of high softness, low VOC content, and excellent odor performance.

Description

Technical Field

[0001] This invention relates to a polyvinyl chloride foam composition and polyvinyl chloride artificial leather, which can be applied in the fields of automobiles and home decoration. Background Technology

[0002] Polyvinyl chloride (PVC) is the main raw material in the development and production of artificial leather, and PVC artificial leather is an important component of automotive interior materials (such as car seat materials). With the continuous upgrading and development of the PVC artificial leather industry, consumers have put forward higher requirements for the odor performance and softness performance of automotive interior materials.

[0003] PVC artificial leather typically consists of layers of fabric, foam, and outer layer, with the foaming agent playing a crucial role in the foam layer. Foaming agents include physical and chemical foaming agents. To improve the material's softness, traditional PVC foam layers often use organic chemical foaming agents. However, products obtained through organic foaming have higher volatile organic compound (VOC) content, poorer odor, and most organic chemical foaming agents are prohibited under the EU REACH regulation. Although physical foaming agents are inexpensive and leave less residue after foaming, under the same conditions, products obtained through physical foaming are harder and less able to meet consumer and market demands for the softness of PVC artificial leather.

[0004] Therefore, there is an urgent need to develop a type of PVC artificial leather that can meet consumers' demand for high softness while also having low VOC content and excellent odor performance. Summary of the Invention

[0005] The purpose of this invention is to address the limitations of traditional PVC artificial leather in simultaneously meeting the requirements of high softness, low VOC content, and excellent odor performance. This invention provides a PVC foaming composition and PVC artificial leather, enabling the development of PVC artificial leather that satisfies both the requirements of low VOC content and excellent odor performance while achieving high softness.

[0006] To address the aforementioned technical problems, embodiments of the present invention disclose a polyvinyl chloride (PVC) foaming composition for preparing PVC artificial leather. The PVC foaming composition comprises: PVC resin, plasticizer, and modified inorganic chemical foaming agent. Based on a total weight of 100 parts by weight of PVC resin and plasticizer, the PVC foaming composition contains 1.5-3.5 parts by weight of modified inorganic chemical foaming agent.

[0007] By adopting the above technical solution, and replacing traditional organic chemical foaming agents and physical foaming agents with modified inorganic chemical foaming agents, it is possible not only to reduce the amount of harmful chemical substances generated during the foaming process, reduce the VOC content of the product, and improve the odor performance of the product, but also to improve the softness of the product without changing the amount of plasticizer. This allows the product to have the advantages of high softness, low VOC content, and excellent odor performance.

[0008] Meanwhile, the foaming agent content in the PVC composition is 1.5-3.5 parts by weight. When the foaming agent content is 1.5 parts by weight, the prepared PVC artificial leather has a lower VOC content and better odor performance; when the foaming agent content is 3.5 parts by weight, the prepared PVC artificial leather has higher softness. Therefore, according to actual production and customer needs, the amount of foaming agent in the PVC composition can be adjusted between 1.5-3.5 parts by weight during processing to meet customer requirements for higher softness or lower VOC content and better odor performance in PVC artificial leather.

[0009] In some implementations of this application, based on a total weight of 100 parts by weight of polyvinyl chloride resin and plasticizer, the polyvinyl chloride foaming composition contains 2.0-3.0 parts by weight of modified inorganic chemical foaming agent.

[0010] Optionally, based on a total weight of 100 parts by weight of polyvinyl chloride resin and plasticizer, the polyvinyl chloride composition also includes 3-11 parts by weight of colorant.

[0011] Optionally, based on a total weight of 100 parts by weight of polyvinyl chloride resin and plasticizer, the polyvinyl chloride composition also includes 4 parts by weight of flame retardant.

[0012] In some implementations of this application, the modified inorganic chemical foaming agent includes a carbonate and a modifier, wherein the modifier includes at least one selected from stearic acid, stearate, erucic acid, erucic acid derivatives, citric acid, citrate, and oxidized polyethylene wax.

[0013] By adopting the above technical solution, the thickness and uniformity of the coating layer in the modified inorganic chemical foaming agent are optimized by changing the type of modifier, thereby optimizing the decomposition temperature of the modified inorganic chemical foaming agent.

[0014] In some implementations of this application, the carbonate is a bicarbonate.

[0015] In some implementations of this application, the bicarbonate is an alkali metal bicarbonate. Preferably, the alkali metal bicarbonate is sodium bicarbonate.

[0016] By adopting the above technical solution and selecting inexpensive and readily available sodium bicarbonate as an inorganic chemical foaming agent, not only can the processing cost of mass production be reduced, but also the residue after foaming with sodium bicarbonate as an inorganic chemical foaming agent is small and has a simple chemical structure, which will not affect the structure and performance of the product.

[0017] In some implementations of this application, the total weight of the modified inorganic chemical foaming agent is 100 parts by weight, and the modified inorganic chemical foaming agent contains 10-50 parts of modifier.

[0018] In some implementations of this application, when the modifier is stearic acid, the modified inorganic chemical foaming agent contains 30-45 parts of stearic acid. Preferably, when the modifier is stearic acid, the modified inorganic chemical foaming agent contains 35-40 parts of stearic acid.

[0019] In some implementations of this application, when the modifier is erucic acid, the modified inorganic chemical foaming agent contains 40-45 parts of erucic acid.

[0020] By adopting the above technical solution, the amount of modifier used when selecting different modifiers is optimized so that the decomposition temperature of the modified inorganic chemical foaming agent prepared by selecting different modifiers is more matched with the foaming temperature of polyvinyl chloride artificial leather.

[0021] In some implementations of this application, the modified inorganic chemical foaming agent is prepared by melt coating or solution coating methods.

[0022] The present invention also discloses a polyvinyl chloride artificial leather, which includes a polyvinyl chloride foam layer prepared from the polyvinyl chloride foam composition of any of the above embodiments.

[0023] By adopting the above technical solution, the foaming performance of the polyvinyl chloride foam layer is improved by adjusting the formulation of the polyvinyl chloride foam composition and the amount of raw materials, thereby improving the softness, VOC content and odor performance of polyvinyl chloride artificial leather, so that the material has the advantages of high softness, low VOC content and excellent odor performance. Attached Figure Description

[0024] Figure 1 This application provides a schematic diagram of the structure of polyvinyl chloride artificial leather.

[0025] Figure 2 The decomposition temperatures of modified inorganic chemical foaming agents prepared under different types and amounts of modifiers are shown.

[0026] Figure 3 The VOC performance of polyvinyl chloride artificial leather prepared under conditions where only the type of foaming agent is different is shown;

[0027] Figure 4 The TVOC concentration of polyvinyl chloride artificial leather prepared under conditions where only the type of foaming agent differs is shown;

[0028] Figure 5 The performance of polyvinyl chloride artificial leather prepared under conditions where only the type of foaming agent is different is shown;

[0029] Figure 6 The VOC performance of polyvinyl chloride artificial leather prepared by varying only the content of modified inorganic chemical foaming agent is shown.

[0030] Figure 7 The TVOC concentrations of polyvinyl chloride artificial leather prepared by varying only the content of modified inorganic chemical foaming agents are shown.

[0031] Figure 8 The performance of polyvinyl chloride artificial leather prepared by varying only the content of modified inorganic chemical foaming agent is shown.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Base fabric layer; 2-Adhesive layer; 3-PVC foam layer; 4-PVC dense layer; 5-Surface treatment layer; 51-Surface treatment primer layer; 52-Surface treatment topcoat layer. Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0035] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0038] Foaming agents are crucial components in the polyvinyl chloride (PVC) foam layer 3, and the choice of foaming agent significantly impacts the foaming ratio, cell structure, and product gas emission performance. Sodium bicarbonate, an environmentally friendly foaming agent, has environmentally friendly, inexpensive, widely available, and high-gas-emission products, showing promising application prospects. However, its low decomposition temperature and wide decomposition temperature range limit its application in the PVC artificial leather processing. Therefore, this invention selects sodium bicarbonate as the foaming agent and modifies it to increase its decomposition temperature and narrow its temperature range, making it better suited to the foaming temperature (180℃-210℃) of the PVC artificial leather processing in this invention.

[0039] The present invention will be further described below with reference to preparation examples and comparative examples.

[0040] Preparation Example

[0041] Preparation Example 1

[0042] This preparation example demonstrates the preparation of modified sodium bicarbonate composite microparticles for use in polyvinyl chloride compositions. The specific method is as follows:

[0043] Weigh out 20g of stearic acid and 80g of sodium bicarbonate respectively. Then heat 20g of stearic acid to a molten state, and then add 80g of sodium bicarbonate to the molten stearic acid. After stirring and mixing evenly, a crude reaction product is obtained. After cooling to room temperature, the reaction product is ground evenly and sieved to obtain modified sodium bicarbonate composite microparticles.

[0044] Preparation Example 2

[0045] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 1 is that the mass of stearic acid in this preparation example is 25g and the mass of sodium bicarbonate is 75g.

[0046] Preparation Example 3

[0047] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 1 is that the mass of stearic acid in this preparation example is 30g and the mass of sodium bicarbonate is 70g.

[0048] Preparation Example 4

[0049] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 1 is that the mass of stearic acid in this preparation example is 35g and the mass of sodium bicarbonate is 65g.

[0050] Preparation Example 5

[0051] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 1 is that the mass of stearic acid in this preparation example is 40g and the mass of sodium bicarbonate is 60g.

[0052] Preparation Example 6

[0053] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 1 is that the mass of stearic acid in this preparation example is 45g and the mass of sodium bicarbonate is 55g.

[0054] Preparation Example 7

[0055] This preparation example demonstrates the preparation of modified sodium bicarbonate composite microparticles for use in polyvinyl chloride compositions. The specific method is as follows:

[0056] Weigh out 20g of erucic acid and 80g of sodium bicarbonate respectively. Then heat 20g of erucic acid to a molten state, and then add 80g of sodium bicarbonate to the molten erucic acid. After stirring and mixing evenly, a crude reaction product is obtained. After cooling to room temperature, the reaction product is ground evenly and sieved to obtain modified sodium bicarbonate composite microparticles.

[0057] Preparation Example 8

[0058] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 7 is that the mass of erucic acid in this preparation example is 25g and the mass of sodium bicarbonate is 75g.

[0059] Preparation Example 9

[0060] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 7 is that the mass of erucic acid in this preparation example is 30g and the mass of sodium bicarbonate is 70g.

[0061] Preparation Example 10

[0062] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 7 is that the mass of erucic acid in this preparation example is 35g and the mass of sodium bicarbonate is 65g.

[0063] Preparation Example 11

[0064] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 7 is that the mass of erucic acid in this preparation example is 40g and the mass of sodium bicarbonate is 60g.

[0065] Preparation Example 12

[0066] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 7 is that the mass of erucic acid in this preparation example is 45g and the mass of sodium bicarbonate is 55g.

[0067] Preparation Example 13

[0068] This preparation example demonstrates the preparation of modified sodium bicarbonate composite microparticles for use in polyvinyl chloride compositions. The specific method is as follows:

[0069] Weigh out 20g of citric acid and 80g of sodium bicarbonate respectively. Then heat 20g of citric acid to a molten state, and then add 80g of sodium bicarbonate to the molten citric acid. After stirring and mixing evenly, a crude reaction product is obtained. After cooling to room temperature, the reaction product is ground evenly and sieved to obtain modified sodium bicarbonate composite microparticles.

[0070] Preparation Example 14

[0071] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 13 is that the mass of citric acid in this preparation example is 25g and the mass of sodium bicarbonate is 75g.

[0072] Preparation Example 15

[0073] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 13 is that the mass of citric acid in this preparation example is 30g and the mass of sodium bicarbonate is 70g.

[0074] Preparation Example 16

[0075] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 13 is that the mass of citric acid in this preparation example is 35g and the mass of sodium bicarbonate is 65g.

[0076] Preparation Example 17

[0077] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 13 is that the mass of citric acid in this preparation example is 40g and the mass of sodium bicarbonate is 60g.

[0078] Preparation Example 18

[0079] This preparation example prepares a modified sodium bicarbonate composite microparticle for use in polyvinyl chloride compositions. The difference between this preparation example and preparation example 13 is that the mass of citric acid in this preparation example is 45g and the mass of sodium bicarbonate is 55g.

[0080] Comparative Example 1

[0081] 100g of sodium bicarbonate solid was selected as a comparative example.

[0082] Table 1: Characterization test results of each preparation example and comparative example

[0083]

[0084]

[0085] Refer to Table 1 and Figure 2 Based on Preparation Examples 1-18 and Comparative Example 1, it can be seen that this application improves the decomposition temperature of the foaming agent by modifying sodium bicarbonate. In this invention, when the amount of modifier added is the same (taking 20 parts by weight of modifier as an example), the modification effect of using stearic acid as a modifier (initial decomposition temperature: 143.9℃, final decomposition temperature: 182.2℃) is better than that of using erucic acid (initial decomposition temperature: 123.8℃, final decomposition temperature: 159.1℃) and citric acid (initial decomposition temperature: 127.7℃, final decomposition temperature: 163.1℃) as modifiers. Under the condition that the modifier is stearic acid, as the amount of stearic acid added in the modified foaming agent increases, the decomposition temperature of the modified foaming agent also increases. However, in order to match the foaming temperature range (180℃-210℃) used in the actual processing, based on the weight of 100 parts of modified foaming agent and the amount of modifier added being 30-45 parts, its decomposition temperature and decomposition temperature range are more compatible with the foaming temperature range of the product in this invention. Preferably, when the amount of modifier added is 35-40 parts, its decomposition temperature and decomposition temperature range are more compatible with the foaming temperature range of the product in this invention.

[0086] The above results show that, in this invention, by adjusting the type and content of the modifier in the modified inorganic chemical foaming agent, it is possible to better match the foaming temperature range in the actual processing.

[0087] The following examples and comparative examples further illustrate the polyvinyl chloride artificial leather provided by the present invention. In each of the following examples, the polyvinyl chloride foam layer of the polyvinyl chloride artificial leather uses stearic acid modified sodium bicarbonate as a foaming agent, wherein the total weight parts of modified sodium bicarbonate are 100 parts and the amount of stearic acid added is 30 parts.

[0088] Example

[0089] Example 1

[0090] This embodiment prepares a polyvinyl chloride artificial leather, comprising the following raw materials in parts by weight:

[0091] The formulation of the polyvinyl chloride dense layer includes, by weight, 50 parts polyvinyl chloride resin, 50 parts plasticizer, and 6.5 parts stabilizer.

[0092] The polyvinyl chloride foam layer formulation comprises, by weight, 50 parts polyvinyl chloride resin, 50 parts plasticizer, 1 part stabilizer, 4 parts flame retardant, and 1 part modified inorganic chemical foaming agent, wherein the modified inorganic chemical foaming agent is prepared by Preparation Example 3.

[0093] The adhesive layer formulation comprises, by weight, 50 parts polyvinyl chloride resin, 50 parts plasticizer, and 1 part stabilizer.

[0094] The surface treatment primer formulation comprises, by weight, 33.3 parts water and 6.1 parts waterborne polyurethane resin containing a curing agent, wherein the waterborne polyurethane resin is obtained by purchase.

[0095] The surface treatment coating formulation comprises, by weight, 33.3 parts water, 6 parts waterborne polyurethane resin containing curing agent, and 7.2 parts additives.

[0096] In this invention, the polyvinyl chloride resin may be selected from, but is not limited to, polyvinyl chloride resins prepared by processes such as emulsion method, suspension method, and micro-suspension method.

[0097] In this invention, the plasticizer may be selected from, but is not limited to: phthalates, trimellitics, and aliphatic terpene plasticizers.

[0098] In this invention, the stabilizer may be selected from, but is not limited to: epoxy compound stabilizers, calcium-zinc stabilizers, phosphite stabilizers, and polyol stabilizers.

[0099] In this invention, the flame retardant may be selected from, but is not limited to: halogenated flame retardants, phosphorus and phosphorus compounds, metal hydrates, expanded graphite, boron compounds, antimony compounds, aluminum oxalate, and zinc sulfide-based flame retardants.

[0100] In the embodiments of this invention, unless specific techniques or conditions are specified, they shall be performed in accordance with the techniques or conditions described in the literature in this field or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0101] This embodiment prepares polyvinyl chloride artificial leather according to the following steps:

[0102] The raw materials for the PVC dense layer, PVC foam layer, and adhesive layer are weighed and mixed evenly according to the above formula to obtain PVC dense layer slurry, PVC foam layer slurry, and adhesive layer slurry. The raw materials for the surface treatment primer and surface treatment top coat are weighed and mixed evenly according to the above formula, and then filtered to obtain surface treatment primer slurry and surface treatment top coat slurry. The PVC dense layer slurry, PVC foam layer slurry, and adhesive layer slurry are sequentially coated onto release paper on a PVC coating machine and dried separately to obtain PVC dense layer 4, PVC foam layer 3, and adhesive layer 2 (see...). Figure 1 After cooling, the release paper is peeled off the material to obtain a semi-finished PVC artificial leather product with a base fabric support. Then, the adhesive layer 2 of the PVC artificial leather semi-finished product is bonded to the base fabric layer 1. Next, surface treatment is performed on a PVC artificial leather surface treatment machine. The surface treatment base coat and surface treatment top coat are sequentially applied to the surface of the dense PVC layer 4. Drying is performed between each application, and again after the surface treatment is completed. The oven temperature for drying the adhesive layer 2 is 180-210℃, and the drying time is 60 seconds.

[0103] Example 2

[0104] The difference between this embodiment and Embodiment 1 is that the content of the modified inorganic chemical foaming agent in this embodiment is 1.5 parts.

[0105] Example 3

[0106] The difference between this embodiment and Embodiment 1 is that the content of the modified inorganic chemical foaming agent in this embodiment is 2 parts.

[0107] Example 4

[0108] The difference between this embodiment and Example 1 is that the content of the modified inorganic chemical foaming agent in this embodiment is 2.5 parts.

[0109] Example 5

[0110] The difference between this embodiment and Embodiment 1 is that the content of the modified inorganic chemical foaming agent in this embodiment is 3 parts.

[0111] Example 6

[0112] The difference between this embodiment and Example 1 is that the content of the modified inorganic chemical foaming agent in this embodiment is 3.5 parts.

[0113] Example 7

[0114] The difference between this embodiment and Embodiment 1 is that the content of the modified inorganic chemical foaming agent in this embodiment is 4 parts.

[0115] Comparative Example 1

[0116] The difference between this comparative example and Example 1 is that the foaming agent used in this example is an organic chemical foaming agent, and its content is 3 parts.

[0117] Comparative Example 2

[0118] The difference between this comparative example and Example 1 is that the foaming agent used in this example is a physical foaming agent, and its content is 3 parts.

[0119] Table 2: Effect of foaming agent type on the properties of polyvinyl chloride artificial leather

[0120]

[0121]

[0122] The formula for calculating the foaming ratio is: (finished foam layer thickness / actual weight per unit area) * empirical value. The empirical value ranges from 1000 to 3000.

[0123] VOC content is tested using the 10L bag method. A higher rating indicates a worse environmental performance of the sample and a higher risk of harm to living organisms.

[0124] The odor assessment was based on the PV3900 standard, using a 200cm sample. 2 The sample was tested for odor, and the lower the rating, the better the odor.

[0125] The softness performance was tested according to the GWTA L50-01:2019-124.8 standard, and the higher the rating, the better the softness of the sample.

[0126] It should be noted that when physical foaming agents are used for foaming, some short-chain alkanes remain on the surface of the product during the production process. Therefore, these short-chain alkanes will be detected in the VOC content test, resulting in a higher VOC content.

[0127] Refer to Table 2 and Figure 3 , Figure 4 , Figure 5It can be seen that, under the same addition amount of foaming agent (taking 3 parts by weight of foaming agent as an example), compared with traditional physical foaming agents and organic chemical foaming agents, polyvinyl chloride artificial leather prepared by foaming with modified inorganic chemical foaming agent has better softness, lower VOC content and better odor performance. In this invention, it can be seen from Example 5 and Comparative Example 2 that the overall performance of PVC artificial leather prepared by foaming with modified inorganic chemical foaming agent is better than that of PVC artificial leather prepared by physical foaming agent. It can also be seen from Example 5 and Comparative Example 1 that although the foaming ratio and softness of PVC artificial leather prepared by modified inorganic chemical foaming agent are slightly inferior to those of PVC artificial leather prepared by organic chemical foaming agent with the same amount of added organic chemical foaming agent, the odor and VOC content of the PVC artificial leather prepared in Example 5 are far superior to those of the PVC artificial leather prepared in Comparative Example 1. With similar softness and foaming ratio, the PVC artificial leather prepared by foaming with modified inorganic chemical foaming agent can better meet the consumer and market demand for non-toxic and environmentally friendly products.

[0128] The above results indicate that the use of modified inorganic chemical foaming agents to replace traditional organic chemical foaming agents and physical foaming agents in the foaming process of this invention can significantly improve the odor performance and reduce the VOC content of polyvinyl chloride artificial leather while maintaining high softness performance, thereby obtaining polyvinyl chloride artificial leather with high softness, low VOC content and excellent odor performance.

[0129] Table 3: Effect of the amount of modified inorganic chemical foaming agent added on the properties of polyvinyl chloride artificial leather

[0130]

[0131]

[0132] ND (Not Detected) means "not detected".

[0133] The VOC content of products prepared by foaming with chemical foaming agents usually deteriorates with the increase of foaming agent addition. Therefore, in this invention, only the VOC performance and TVOC concentration under high foaming agent addition are shown.

[0134] Refer to Table 3 and Figure 6 , Figure 7 , Figure 8As can be seen from Examples 1-7, when the modified inorganic chemical foaming agent prepared in Preparation Example 3 is used as the foaming agent, the higher the amount of foaming agent added, the higher the foaming ratio and the better the softness of the PVC artificial leather. However, this process is also accompanied by a gradual increase in VOC content and a worsening odor. When the content of the modified inorganic chemical foaming agent in the PVC foam layer is 2.0-3.0 parts, the prepared PVC artificial leather has high softness, low VOC content, and excellent odor performance.

[0135] The above results indicate that, in this invention, by adjusting the content of the modified inorganic chemical foaming agent in the polyvinyl chloride foaming composition of polyvinyl chloride artificial leather, the comprehensive needs of consumers and the market for high softness, low VOC content and excellent odor performance of polyvinyl chloride artificial leather can be better met.

[0136] In some embodiments, embossing can be performed on the surface of polyvinyl chloride artificial leather according to actual needs to obtain polyvinyl chloride artificial leather with different appearance patterns and feel.

[0137] In some embodiments, the polyvinyl chloride artificial leather can be cut into finished products according to actual needs.

[0138] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A polyvinyl chloride foaming composition for preparing polyvinyl chloride artificial leather, characterized in that, The polyvinyl chloride foaming composition comprises: polyvinyl chloride resin, plasticizer, and modified inorganic chemical foaming agent, wherein the polyvinyl chloride foaming composition contains 1.5-3.5 parts of modified inorganic chemical foaming agent based on a total weight of 100 parts by weight of the polyvinyl chloride resin and the plasticizer.

2. The polyvinyl chloride foaming composition according to claim 1, characterized in that, Based on a total weight of 100 parts by weight of the polyvinyl chloride resin and the plasticizer, the polyvinyl chloride foaming composition contains 2.0-3.0 parts of modified inorganic chemical foaming agent.

3. The polyvinyl chloride foaming composition according to claim 1, characterized in that, The modified inorganic chemical foaming agent includes a carbonate and a modifier, wherein the modifier includes at least one selected from stearic acid, stearate, erucic acid, erucic acid derivatives, citric acid, citrate, and oxidized polyethylene wax.

4. The polyvinyl chloride foaming composition according to claim 3, characterized in that, The carbonate is a bicarbonate.

5. The polyvinyl chloride foaming composition according to claim 4, characterized in that, The bicarbonate is an alkali metal bicarbonate.

6. The polyvinyl chloride foaming composition according to claim 3, characterized in that, Based on the total weight of the modified inorganic chemical foaming agent being 100 parts by weight, the modified inorganic chemical foaming agent contains 10-50 parts of the modifier.

7. The polyvinyl chloride foaming composition according to claim 6, characterized in that, When the modifier is stearic acid, the modified inorganic chemical foaming agent contains 30-45 parts of stearic acid.

8. The polyvinyl chloride foaming composition according to claim 6, characterized in that, When the modifier is erucic acid, the modified inorganic chemical foaming agent contains 40-45 parts of erucic acid.

9. The polyvinyl chloride foaming composition according to claim 6, characterized in that, The modified inorganic chemical foaming agent is prepared by melt coating or solution coating methods.

10. A type of polyvinyl chloride artificial leather, characterized in that, The polyvinyl chloride artificial leather includes a polyvinyl chloride foam layer prepared from the polyvinyl chloride foam composition according to any one of claims 1 to 9.

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