PVC heat stabilizer and application thereof

Abstract

The invention relates to the technical field of heat stabilizers, in particular to the field of IPC C08K5, and more particularly relates to a PVC heat stabilizer and application thereof. The invention relates to a high-temperature-resistant flame retardant, which is prepared from the following components in percentage by weight: 5 to 20 percent of organic acid zinc salt, 2 to 15 percent of beta-diketone, 1 to 5 percent of polyhydric alcohol, 0.5 to 2 percent of nucleating agent, 1 to 10 percent of fatty acid lubricant and the balance of ternary hydrotalcite. When the modified PVC crystal plate is applied to the PVC crystal plate, the initial whiteness is considered, the long-term heat resistance and color fastness are prolonged, and meanwhile, the lasting heat resistance can be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of heat stabilizers, in particular to the field of IPC C08K5, and more specifically to a PVC heat stabilizer and application thereof. Background Art

[0002] PVC crystal board is a transparent board made of PVC (polyvinyl chloride) material. PVC crystal board has many advantages, including heat resistance, cold resistance, aging resistance, heavy pressure resistance, strong acid and alkali resistance, good light transmittance, long service life, etc. It is suitable for various countertops such as dining tables, office desks, writing desks, bedside tables and coffee tables. It can effectively prevent external damage such as burns, cuts, and scratches. It also has high resilience and folding and compression resistance. In order to maintain good thermal stability, additives are needed in the preparation process. At present, organic tin thermal stabilizers are more commonly used, but there is a pungent odor and poor environmental performance.

[0003] Chinese invention patent CN103435845B discloses an organic tin auxiliary heat stabilizer, which is a thiol that reacts with sulfur using an organic amine as a catalyst to generate a disulfide and a by-product of hydrogen sulfide; the disulfide is compounded with a general PVC stabilizer to obtain a stabilizer, but the environmental performance is poor and the cost of the tin raw material is high. Summary of the invention

[0004] The first aspect of the present invention provides a PVC heat stabilizer, which comprises, by weight percentage, 5-20% of organic acid zinc salt, 2-15% of β-diketone, 1-5% of polyol, 0.5-2% of nucleating agent, 1-10% of fatty acid lubricant, and the balance of ternary hydrotalcite.

[0005] The organic acid zinc salt includes a benzene ring zinc salt, and the benzene ring zinc salt includes at least one of zinc dodecylbenzene sulfonate, zinc benzoate and zinc p-tert-butylbenzoate.

[0006] Preferably, the benzene ring zinc salt includes at least one of zinc benzoate and zinc p-tert-butylbenzoate.

[0007] Further preferably, the benzene ring zinc salt includes zinc p-tert-butylbenzoate.

[0008] The weight ratio of the organic acid zinc salt to the ternary hydrotalcite is (1-4): (4-12).

[0009] Preferably, the weight ratio of the organic acid zinc salt to the ternary hydrotalcite is (2-4):(6-10).

[0010] Further preferably, the weight ratio of the organic acid zinc salt to the ternary hydrotalcite is 5:16.

[0011] The β-diketone includes at least one of dibenzoylmethane, stearoylbenzoylmethane, acetylacetone, isovalerylbenzoylmethane and octanoylbenzoylmethane.

[0012] The β-diketone comprises dibenzoylmethane and stearoylbenzoylmethane, and the weight ratio of the dibenzoylmethane to stearoylbenzoylmethane is (1-10):(1-5).

[0013] Preferably, the weight ratio of dibenzoylmethane to stearoylbenzoylmethane is (3-10):(2-5).

[0014] More preferably, the weight ratio of dibenzoylmethane to stearoylbenzoylmethane is 11:6.

[0015] The polyol includes at least one of pentaerythritol, trimethylolpropane, dipentaerythritol, pentaerythritol ester, dipentaerythritol ester and tris(2-hydroxyethyl)isocyanurate.

[0016] Preferably, the polyol comprises a pentaerythritol ester.

[0017] More preferably, the pentaerythritol ester is an activated pentaerythritol ester.

[0018] The nucleating agent includes a substituted aryl phosphate nucleating agent and / or a sorbitol nucleating agent.

[0019] Preferably, the substituted aryl phosphate nucleating agent includes NA98 (purchased from Chenghe Technology Co., Ltd.), and the sorbitol nucleating agent includes at least one of NA98 and NA98G (both purchased from Chenghe Technology Co., Ltd.).

[0020] Preferably, the molar ratio of magnesium oxide to aluminum oxide in the magnesium-aluminum-silicon ternary hydrotalcite is (3-4):1.

[0021] The D50 particle size of the ternary hydrotalcite is not higher than 150 nm, and the BET specific surface area is 20-50 m 2 / g.

[0022] Preferably, the D50 particle size of the ternary hydrotalcite is 80-140 nm, and the BET specific surface area is 20-40 m 2 / g.

[0023] The fatty acid lubricant includes at least one of the following models: GH4, G70S, G71S, G78, G53, G60, P1141, and P861, all of which are purchased from JCDecaux Emery.

[0024] Preferably, the fatty acid lubricant includes the following models: GH4, G70S, G71S, and the weight ratio of GH4, G70S, and G71S is 1:(0.8-2):(1-2).

[0025] Further preferably, the weight ratio of GH4, G70S and G71S is 1:(0.8-1.2):(1-1.5).

[0026] More preferably, the weight ratio of GH4, G70S and G71S is 3:3:4.

[0027] The present application has found that the ternary hydrotalcite includes magnesium-aluminum-silicon ternary hydrotalcite, and the molar ratio of magnesium oxide to aluminum oxide in the magnesium-aluminum-silicon ternary hydrotalcite is (2-5): 1. The heat resistance of the PVC crystal plate can be improved, which may be because the specific magnesium oxide and aluminum oxide in the hydrotalcite form a specific prismatic hexahedron crystal form, but the transparency of the prismatic hexahedron crystal form may be affected. The present applicant has found that adding a benzene ring zinc salt, especially limiting the weight ratio of the benzene ring zinc salt to the ternary hydrotalcite to (1-4): (4-12), can maintain excellent transparency on the basis of heat resistance, which may be because the benzene ring structure promotes the orderly crystallization of the system.

[0028] The preparation of the PVC heat stabilizer is as follows: all components are mixed evenly to obtain the PVC heat stabilizer.

[0029] The second aspect of the present invention provides an application of a PVC heat stabilizer, which is applied to the preparation of a PVC crystal plate.

[0030] Beneficial Effects

[0031] 1. The ternary hydrotalcite includes magnesium-aluminum-silicon ternary hydrotalcite, and the molar ratio of magnesium oxide to aluminum oxide in the magnesium-aluminum-silicon ternary hydrotalcite is (2-5): 1. The heat resistance of the PVC crystal plate can be improved.

[0032] 2. Adding benzene ring zinc salt, especially limiting the weight ratio of benzene ring zinc salt to ternary hydrotalcite to (1-4):

[0033] (4-12) can maintain excellent transparency while maintaining heat resistance.

[0034] 3. β-diketone includes dibenzoylmethane and stearoylbenzoylmethane, and the weight ratio of dibenzoylmethane to stearoylbenzoylmethane is (1-10): (1-5), which can improve the initial whiteness and color fastness of the PVC crystal board on the basis of heat resistance.

[0035] 4. Selecting pentaerythritol ester as the polyol, especially activated pentaerythritol ester, can improve the aging performance at high temperature.

[0036] 5. By selecting fatty acid lubricants with a weight ratio of GH4, G70S, and G71S of 1:(0.8-1.2):(1-1.5), the heat resistance can be further improved, and the heat resistance temperature can reach 200℃. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 These are the aging performance test results of the crystal plates prepared with the heat stabilizers of Example 1 and Comparative Example 1, wherein the upper portion corresponds to Example 1 and the lower portion corresponds to Comparative Example 1. DETAILED DESCRIPTION

[0038] Example 1

[0039] A PVC heat stabilizer comprises, by weight percentage, 12.5% ​​of organic acid zinc salt (zinc p-tert-butylbenzoate), 8.5% of beta-diketone, 3% of polyol (surface activated dipentaerythritol ester, Suzhou Sanyi Polymerization Chemical Technology Co., Ltd., model: FK-04Y), 1.25% of nucleating agent (Chenghe Technology Co., Ltd., model: NA98), 5.5% of fatty acid lubricant, and the balance of ternary hydrotalcite (Chenghe Technology Co., Ltd., model: AZ-128).

[0040] The β-diketone consists of dibenzoylmethane and stearoylbenzoylmethane, and the weight ratio of the dibenzoylmethane to stearoylbenzoylmethane is 11:6.

[0041] The fatty acid lubricant is composed of the following models: GH4, G70S, G71S, all purchased from JACQUET Emory, and the weight ratio of GH4, G70S, and G71S is 3:3:4.

[0042] The preparation of the PVC heat stabilizer is as follows: all components are mixed evenly to obtain the PVC heat stabilizer.

[0043] The invention discloses an application of a PVC heat stabilizer, which is applied to the preparation of PVC crystal plates.

[0044] Comparative Example 1

[0045] A PVC heat stabilizer, an organic tin heat stabilizer, purchased from Arkema, France, model: Tm181 Performance test method and data

[0046] The heat stabilizers in the examples and comparative examples were added to PVC to prepare 1 mm thin PVC crystal plates (unit: kg: PVC resin powder: 100, plasticizer: 35, stabilizer: CZ-0038: 1.5, lubricant: 0.2). The PVC crystal plates were placed in a 200°C aging box for aging experiments. The plates were taken at intervals and the colors were observed. The test results are shown in the figure. Figure 1 As shown, the color transparency of Example 1 is significantly higher than that of Comparative Example 1 within the same period of time.

Claims

1. A PVC heat stabilizer, characterized in that: Calculated by weight percentage, the components include: 5-20% of organic acid zinc salt, 2-15% of beta-diketone, 1-5% of polyol, 0.5-2% of nucleating agent, 1-10% of fatty acid lubricant, and the balance is made up of ternary hydrotalcite.

2. The PVC heat stabilizer according to claim 1, characterized in that The organic acid zinc salt includes a benzene ring zinc salt, and the benzene ring zinc salt includes at least one of zinc dodecylbenzene sulfonate, zinc benzoate and zinc p-tert-butylbenzoate.

3. The PVC heat stabilizer according to claim 2, characterized in that The weight ratio of the organic acid zinc salt to the ternary hydrotalcite is (1-4): (4-12).

4. The PVC heat stabilizer according to claim 3, characterized in that: The β-diketone includes at least one of dibenzoylmethane, stearoylbenzoylmethane, acetylacetone, isovalerylbenzoylmethane and octanoylbenzoylmethane.

5. The PVC heat stabilizer according to claim 4, characterized in that: The β-diketone comprises dibenzoylmethane and stearoylbenzoylmethane, and the weight ratio of the dibenzoylmethane to stearoylbenzoylmethane is (1-10):(1-5).

6. The PVC heat stabilizer according to claim 5, characterized in that: The polyol includes at least one of pentaerythritol, trimethylolpropane, dipentaerythritol, pentaerythritol ester, dipentaerythritol ester and tris(2-hydroxyethyl)isocyanurate.

7. The PVC heat stabilizer according to claim 1 or 6, characterized in that: The nucleating agent includes a substituted aryl phosphate nucleating agent and / or a sorbitol nucleating agent.

8. The PVC heat stabilizer according to claim 7, characterized in that: The ternary hydrotalcite includes magnesium-aluminum-silicon ternary hydrotalcite, and the molar ratio of magnesium oxide to aluminum oxide in the magnesium-aluminum-silicon ternary hydrotalcite is (2-5):

1.

9. The PVC heat stabilizer according to claim 8, characterized in that: The D50 particle size of the ternary hydrotalcite is not higher than 150 nm, and the BET specific surface area is 20-50 m 2 / g.

10. An application of the PVC heat stabilizer according to claim 8, characterized in that: Used in the preparation of PVC crystal plates.

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