Stabilizer for transparent PVC (polyvinyl chloride) product as well as preparation method and application of stabilizer

Abstract

The invention relates to the technical field of stabilizers, in particular to a stabilizer for a transparent PVC (polyvinyl chloride) product and a preparation method and application thereof, and the stabilizer at least comprises the following components in parts by weight: 10-18 parts of organic acid calcium zinc, 8-15 parts of an auxiliary stabilizer, 5-12 parts of an antioxidant, 4-10 parts of a lubricant, 30-55 parts of hydrotalcite and 10-25 parts of polyvinyl chloride. The auxiliary stabilizer at least comprises stearoylbenzoylmethane, dibenzoylmethane and tris (2-hydroxyethyl) isocyanurate, the sum of the addition amount of the organic acid calcium zinc and the tris (2-hydroxyethyl) isocyanurate is smaller than or equal to 26 parts by weight, and through the combined action of the multiple components, the provided product has the advantages of environmental protection, high transparency, excellent thermal stability and wear resistance; the application defect of the calcium-zinc stabilizer in transparent PVC products is effectively overcome, and the actual application requirement is better met.

Description

Technical Field

[0001] This invention relates to the field of stabilizer technology, specifically to a stabilizer for transparent PVC products, its preparation method, and its application. Background Technology

[0002] Transparent PVC (polyvinyl chloride) products prepared with existing heat stabilizers still have the following problems: poor initial colorability, affecting the appearance of transparent products; insufficient long-term thermal stability, leading to yellowing after aging; mismatched lubricity, causing easy precipitation during processing, affecting the surface smoothness of transparent products; and easy discoloration of transparent products in the later stages. Chinese patent application (publication number CN118496605A) discloses an environmentally friendly antistatic PVC wear-resistant layer formulation and its preparation method. By using epoxy fatty acid methyl ester and environmentally friendly liquid calcium-zinc stabilizer in the wear-resistant layer, combined with a cationic liquid antistatic agent, it solves the problems of existing wear-resistant layers failing to meet environmental standards and electrostatic discharge. However, further improvements are needed in the overall maintenance of thermal stability, optical properties, and durability. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a stabilizer for transparent PVC products. Through the combined action of multiple components, the provided product possesses environmental friendliness, high transparency, excellent thermal stability, and wear resistance, effectively overcoming the application shortcomings of calcium-zinc stabilizers in transparent PVC products and better meeting practical application needs.

[0004] This invention provides a stabilizer for transparent PVC products, comprising at least the following components by weight: 10-18 parts of organic acid calcium zinc, 8-15 parts of auxiliary stabilizer, 5-12 parts of antioxidant, 4-10 parts of lubricant, 30-55 parts of hydrotalcite, and 10-25 parts of polyvinyl chloride; wherein the auxiliary stabilizer comprises at least stearoyl benzoylmethane, dibenzoylmethane, and trihydroxyethyl isocyanurate; and the sum of the amounts of organic acid calcium zinc and trihydroxyethyl isocyanurate added is ≤26 parts by weight.

[0005] In one embodiment, the stabilizer for transparent PVC products, by weight, comprises at least the following components: 13.5-15 parts of organic acid calcium zinc, 10-12 parts of auxiliary stabilizer, 8.5-9 parts of antioxidant, 5.5-6 parts of lubricant, 43.5-45 parts of hydrotalcite, and 15-17 parts of polyvinyl chloride.

[0006] In one embodiment, the organic acid calcium zinc includes at least zinc stearate.

[0007] In one embodiment, the mass ratio of stearoylbenzoylmethane, dibenzoylmethane, and trihydroxyethyl isocyanurate is (3-4):(1-2):(5-8).

[0008] In one embodiment, the mass ratio of stearoylbenzoylmethane, dibenzoylmethane, and trihydroxyethyl isocyanurate is 3:2:(6-7).

[0009] In one embodiment, the average particle size of the hydrotalcite is 0.3-0.8 μm.

[0010] In one embodiment, the average particle size of the hydrotalcite is 0.5-0.6 μm. In this invention, by optimizing the combination of organic acid calcium zinc, auxiliary stabilizers, and hydrotalcite, especially by introducing primary stabilizers including stearoylbenzoylmethane, dibenzoylmethane, and trihydroxyethyl isocyanurate, a multi-layered stabilizing network is constructed to suppress the catalytic effect of ZnCl2, improve the thermal stability of subsequent PVC products, effectively inhibit material decomposition during high-temperature processes such as extrusion and calendering, prevent discoloration and performance degradation, and ensure structural uniformity. Furthermore, by controlling the addition amounts of trihydroxyethyl isocyanurate and zinc stearate in the system, the blooming problem (the phenomenon where additives in the formulation migrate from the interior of the material to the surface, forming a white mist or powdery residue) in the subsequent PVC product preparation process is effectively suppressed, ensuring the appearance and overall performance of the product.

[0011] In one embodiment, the antioxidant is selected from at least one of antioxidant 1076, antioxidant 1010, antioxidant 1135, or antioxidant BHT.

[0012] This invention optimizes the combination of stearoylbenzoylmethane, dibenzoylmethane, hydrotalcite, and antioxidant 1076 in the system, enabling PVC products containing this stabilizer to have excellent long-term thermal stability and anti-yellowing properties, reducing cracking, yellowing, and other problems, maintaining the appearance and functional stability of the products, extending the product life, and better meeting practical application needs.

[0013] In one embodiment, the lubricant is selected from at least one of pentaerythritol stearate, monoglyceride glycerol, diglyceride glycerol, or calcium stearate.

[0014] Based on the organic acid calcium and zinc in the system, mono-fatty acid glycerides are introduced to balance processability and optical properties, and to avoid precipitation during processing, which would affect the surface smoothness and transparency of PVC products.

[0015] Another aspect of the present invention provides a method for preparing a stabilizer for transparent PVC products, comprising at least the following steps: mixing organic acid calcium zinc, auxiliary stabilizer, antioxidant, lubricant, hydrotalcite, and polyvinyl chloride.

[0016] Another aspect of the present invention provides an application of a stabilizer for transparent PVC products, which is used in the preparation of transparent PVC products, the transparent PVC products including a transparent PVC wear-resistant layer or a transparent PVC decorative layer.

[0017] Beneficial effects 1. This invention provides a stabilizer for transparent PVC products. Through the combined action of multiple components, the provided product combines environmental friendliness, high transparency, excellent thermal stability and wear resistance, effectively solving the application defects of calcium-zinc stabilizers in transparent PVC products and better meeting the needs of practical applications.

[0018] 2. In the system of this invention, by optimizing the combination of organic acid calcium zinc, auxiliary stabilizer and hydrotalcite, especially by introducing primary stabilizers including stearoyl benzoylmethane, dibenzoylmethane and trihydroxyethyl isocyanurate, a multi-level stable network is constructed to inhibit the catalytic effect of ZnCl2, improve the thermal stability of subsequent PVC products, effectively inhibit material decomposition in high-temperature processes such as extrusion and calendering, prevent discoloration and performance degradation, and ensure structural uniformity.

[0019] 3. By optimizing the combination of stearoylbenzoylmethane, dibenzoylmethane, hydrotalcite and antioxidant 1076 in the system, this invention enables PVC products containing this stabilizer to have excellent long-term thermal stability and anti-yellowing properties, reduce cracking, yellowing and other problems, maintain the appearance and functional stability of the products, extend the product life, and better meet the needs of practical applications.

[0020] 4. Based on the organic acid calcium zinc in the system, the introduction of mono-fatty acid glycerides forms a gradient lubrication, balancing processability and optical properties, and avoiding precipitation during processing, which would affect the surface smoothness and transparency of PVC products.

[0021] 5. The stabilizer provided by this invention can be used in the transparent PVC wear-resistant layer of commercial or residential flooring to resist foot traffic and furniture friction while maintaining high light transmittance (such as the transparent PVC covering layer of wood grain and stone grain flooring); it can also be used in the high-gloss transparent PVC finishing layer of wall panels or ceilings to enhance the decorative effect. Detailed Implementation

[0022] Example 1, Comparative Example 1 Example 1 and Comparative Example 1 of the present invention provide a stabilizer for transparent PVC products, the formulation of which is shown in Table 1 by weight.

[0023] Table 1

[0024] Example 1 and Comparative Example 1 of the present invention provide a method for preparing a stabilizer for transparent PVC products, comprising the following steps: mixing organic acid calcium zinc, auxiliary stabilizer, antioxidant, lubricant, hydrotalcite and polyvinyl chloride.

[0025] Comparative Example 2 Comparative Example 2 of this invention is a commercially available stabilizer, brand name CZ-121W, sourced from Yancheng Jingze New Materials Co., Ltd.

[0026] Performance testing 1. The stabilizers for transparent PVC products provided in Example 1 and Comparative Example 2 were subjected to the performance tests listed in Table 2. The test methods and test results are shown in Table 2. The product of Comparative Example 1 failed the blooming test and no other tests were performed.

[0027] Table 2 Test Project Example 1 Comparative Example 2 Test standards / methods Initial thermal stability time 65±2 minutes 40±3 minutes GB / T 2917.1-2002 Long-term thermal stability time 130±5 minutes 90±5 minutes DB44 / T 1588-2015 Light transmittance (2mm sheet) 92% 85% GB / T 2410-2008 Yellowing index after heat aging 8.5 15.2 ASTM E313 Yellowing index after accelerated aging by ultraviolet light 10.8 18.5 GB / T 16422.3-2014 Taber wear 45mg / 1000 rpm 70mg / 1000rpm GB / T 4085-2015 Lead content Not detected (<1 ppm) - GB / T 26572-2011 As can be seen from Table 2, the stabilizer for transparent PVC products provided in Example 1 of this invention can effectively avoid blooming problems compared to Comparative Example 1, and has significantly improved overall performance compared to stabilizers on the market.

Claims

1. A stabilizer for transparent PVC products, characterized by, By weight, it comprises at least the following components: 10-18 parts of organic acid calcium zinc, 8-15 parts of auxiliary stabilizer, 5-12 parts of antioxidant, 4-10 parts of lubricant, 30-55 parts of hydrotalcite, and 10-25 parts of polyvinyl chloride; the auxiliary stabilizer includes at least stearoyl benzoylmethane, dibenzoylmethane, and trihydroxyethyl isocyanurate; the sum of the amounts of organic acid calcium zinc and trihydroxyethyl isocyanurate added is ≤26 parts by weight.

2. The stabilizer for transparent PVC products according to claim 1, characterized by, By weight, the stabilizer for transparent PVC products comprises at least the following components: 13.5-15 parts of organic acid calcium zinc, 10-12 parts of auxiliary stabilizer, 8.5-9 parts of antioxidant, 5.5-6 parts of lubricant, 43.5-45 parts of hydrotalcite, and 15-17 parts of polyvinyl chloride.

3. The stabilizer for transparent PVC products according to claim 1, characterized in that, The organic acid calcium zinc includes at least zinc stearate.

4. The stabilizer for transparent PVC products according to claim 1, characterized in that, The mass ratio of stearoylbenzoylmethane, dibenzoylmethane, and trihydroxyethyl isocyanurate is (3-4):(1-2):(5-8).

5. The stabilizer for transparent PVC products according to claim 1, characterized in that, The average particle size of the hydrotalcite is 0.3-0.8 μm.

6. The stabilizer for transparent PVC products according to claim 5, characterized in that, The average particle size of the hydrotalcite is 0.5-0.6 μm.

7. The stabilizer for transparent PVC products according to claim 1, characterized in that, The antioxidant is selected from at least one of antioxidant 1076, antioxidant 1010, antioxidant 1135 or antioxidant BHT.

8. The stabilizer for transparent PVC products according to claim 1, characterized in that, The lubricant is selected from at least one of pentaerythritol stearate, monoglyceride glycerol, diglyceride glycerol, or calcium stearate.

9. A method for preparing a stabilizer for transparent PVC products according to any one of claims 1-8, characterized in that, It includes at least the following steps: mixing organic acid calcium zinc, auxiliary stabilizer, antioxidant, lubricant, hydrotalcite, and polyvinyl chloride.

10. The application of a stabilizer for transparent PVC products according to any one of claims 1-8, characterized in that, This technology is applied to the preparation of transparent PVC products, which include a transparent PVC wear-resistant layer or a transparent PVC decorative layer.

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