High-heat-resistant and high-modulus PVC alloy and preparation method thereof

Abstract

The application relates to a PVC alloy with high heat resistance and high modulus and a preparation method thereof. The components of the PVC alloy comprise the following in parts by weight: 90-120 parts of PVC; 100-120 parts of ABS; 6-10 parts of a heat stabilizer; 2-8 parts of a lubricant; 7-15 parts of a toughening agent; and 5-20 parts of a filling agent. The PVC alloy has high heat resistance and high modulus.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high polymer materials, and particularly relates to a PVC alloy with high heat resistance and high modulus and a preparation method thereof. BACKGROUND

[0002] PVC material is resistant to acid and alkali, corrosion, has diversified processing modes, is rich in output, low in price, and has flame retardation, and is one of the most widely used general-purpose plastics, and is long-term applied to the fields of electronics and electrical appliances, building materials and bathroom, safety protection, etc. The defects in the use process of the PVC material are also obvious: the heat resistance is poor, the ordinary modified PVC has a Vicat temperature (B120) of only 75 DEG C, and is easily softened in a higher temperature use environment, thereby affecting the material performance. ABS and PVC are blended and modified to obtain a PVC / ABS high polymer alloy material, which has the advantages of PVC such as flame retardation and weather resistance, and also has the performance of ABS such as heat resistance and toughness, can realize performance complementation, and the Vicat temperature (B120) can be improved to 80 DEG C, but the modulus of the PVC / ABS alloy is reduced, and the index requirement cannot be met in many use occasions. SUMMARY

[0003] The application solves the technical problem of providing a PVC alloy with high heat resistance and high modulus and a preparation method thereof, so as to overcome the defects that the PVC / ABS alloy cannot have good heat resistance and modulus in the prior art.

[0004] The application provides a PVC alloy with high heat resistance and high modulus, and the components of the PVC alloy include, in terms of weight fractions, the following components:

[0005] The heat stabilizer is a calcium-zinc stabilizer and a beta-diketone with a weight ratio of 2.5:1-8:1;

[0006] The toughening agent is MBS and chlorinated polyethylene with a weight ratio of 1:1-5:1.

[0007] Preferably, the components of the PVC alloy include, in terms of weight fractions, the following components:

[0008]

[0009]

[0010] Preferably, the ABS impact strength is 25-35 KJ / m 2 The test standard of the impact strength is GB / T 1843-2008.

[0011] Preferably, the weight ratio of the zinc stabilizer and the beta-diketone is 3:1-5:1.

[0012] Preferably, the weight ratio of the MBS and chlorinated polyethylene is 2.5:1-4:1.

[0013] Preferably, the calcium-zinc stabilizer comprises at least one of calcium stearate, calcium maleate and at least one of zinc stearate, zinc maleate.

[0014] Preferably, the beta-diketone comprises one or more of dibenzoylmethane, hard acyl benzoylmethane, acetylacetone.

[0015] Preferably, the lubricant comprises one or more of polyethylene wax, stearic acid, paraffin wax.

[0016] Preferably, the filler comprises one or more of calcium carbonate, barium sulfate, talc powder.

[0017] Preferably, the PVC alloy further comprises other auxiliary agents 0-6 parts.

[0018] Preferably, the other auxiliary agent comprises one or more of flame retardant, antioxidant.

[0019] Preferably, the flame retardant is 0.1-3 parts by weight.

[0020] Preferably, the flame retardant comprises one or more of antimony trioxide, magnesium hydroxide, aluminum hydroxide.

[0021] Preferably, the antioxidant is 0.1-3 parts by weight.

[0022] Preferably, the antioxidant comprises one or more of hindered phenolic antioxidant, phosphite antioxidant, sulfide antioxidant.

[0023] The application also provides a preparation method of the high-heat-resistance and high-modulus PVC alloy, comprising:

[0024] Mixing the components, and adding the obtained mixture into a double-screw extruder to extrude the material, thereby obtaining the high-heat-resistance and high-modulus PVC alloy.

[0025] Preferably, the temperature of each section of the double-screw extruder is 80-150℃, and the screw length-diameter ratio is 28:1-36:1.

[0026] The application also provides an application of the high-heat-resistance and high-modulus PVC alloy in electronic and electrical, household appliances or power tools, such as switch panel, electric control box, smoke alarm, etc.

[0027] The beta-diketone and calcium-zinc stabilizer are compounded in the present application, the beta-diketone is complexed with zinc salt in the system to generate very stable beta-diketone zinc, which maintains a higher effective concentration than calcium-zinc stabilizer, slows down the consumption of synergistic stabilizer, inhibits the discoloration of the material and improves the late heat resistance; at the same time, the beta-diketone stabilizes the chlorinated polyethylene segment, makes the MBS more uniform, reduces the particle size of chlorinated polyethylene, promotes the formation and fine uniformization of the chlorinated polyethylene grid structure, makes the molecular segment more stable, enhances the melt strength of the material, and thus improves the modulus and heat resistance of the material.

[0028] Advantages

[0029] The present application adopts the heat stabilizer calcium-zinc stabilizer and beta-diketone compound, and at the same time adopts the toughening agent MBS and chlorinated polyethylene compound, so that the PVC alloy has high heat resistance and high modulus.

[0030] The PVC alloy of the present application has a Vicat softening point of at least 83.0℃ and a bending modulus of at least 2280MPa. DETAILED DESCRIPTION

[0031] The present application will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present application and not used to limit the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalent forms also fall within the scope of the appended claims of the present application.

[0032] Reagent source:

[0033] PVC: PVC TL-700, Tianjin Lejin Bohai Chemical Co., Ltd.;

[0034] ABS1: ABS D-120A, impact strength 29KJ / m 2 , Guojiao Petrochemical Co., Ltd.;

[0035] ABS2: ABS AG10NP, impact strength 34KJ / m 2 , Taizhongxingye (Ningbo) Co., Ltd.;

[0036] ABS3: ABS 750N, impact strength 18KJ / m 2 , South Korea Kumho Petrochemical Co., Ltd.;

[0037] Heat stabilizer:

[0038] Calcium-zinc stabilizer 1: calcium stearate and zinc stearate compound, weight ratio of calcium stearate and zinc stearate is 1:1, RUP-110C, Aidi Investment Co., Ltd.;

[0039] Calcium-zinc stabilizer 2: calcium stearate and zinc stearate compound, weight ratio of calcium stearate and zinc stearate is 7:5, DA-913A, Zhenzhong Plastic Co., Ltd.;

[0040] Calcium-zinc stabilizer 3: calcium maleate and zinc maleate compound, weight ratio of calcium maleate and zinc maleate is 1:1, its preparation method is: calcium maleate (commercially available) and zinc maleate (commercially available) are mixed at room temperature according to a weight ratio of 1:1, and stirring is performed, and then it is obtained; β-diketone 1: hard acetylbenzoyl methane, T-386, Shuangyan Chemical Co., Ltd.;

[0041] β-diketone 2: dibenzoylmethane, DMB, Kovod Chemical Co., Ltd.;

[0042] β-diketone 3: acetylacetone, Shandong Qiyuan Chemical Co., Ltd.;

[0043] Organic tin stabilizer: SAK-MT9001, Singapore San Yi Chemical Industry;

[0044] Toughening agent:

[0045] MBS: B564, Japan Zhong Yuan Chemical Industry Co., Ltd.;

[0046] Chlorinated polyethylene: CPE-702P, Dow Chemical;

[0047] Lubricant: polyethylene wax, AC-617A, Honeywell;

[0048] Filling agent: calcium carbonate, AC-MLT02, Dongguan Meilitai Chemical Co., Ltd.;

[0049] Other auxiliary agents:

[0050] Antioxidant: antioxidant 1010, commercially available;

[0051] Flame retardant: antimony trioxide, commercially available;

[0052] If not specifically stated, a component (such as an antioxidant, a flame retardant) in the parallel examples and comparative examples of the present application is the same commercially available product.

[0053] The preparation method of the PVC alloy comprises the following steps: according to the proportions in Table 1, Table 2 and Table 3, the PVC, ABS, calcium-zinc stabilizer, β-diketone, toughening agent, lubricant and antioxidant are placed in a high-speed mixer, mixed to 60-70 ℃, the filling agent and the flame retardant are added, and then mixed again to 80 ℃, and then the material is discharged into a cooling cylinder to obtain a mixed material, and a double-stage double-screw extruder is used for extruding the material, and then the PVC alloy is obtained, wherein the temperature of each section of the double-stage double-screw extruder is 80-150 ℃, and the length-diameter ratio of the screw is 28:1-36:1.

[0054] Performance test:

[0055] (1) Vicat softening point: tested according to test standard ISO 306-2013, load 50N, heating rate 120℃ / h, sample size 80x10x4mm;

[0056] (2) Bending modulus: tested according to test standard GB / T 9341-2008 plastic bending performance, bending rate 2mm / min, sample size 80x10x4mm.

[0057] Table 1: Proportion of examples 1-9 (parts by weight)

[0058]

[0059]

[0060] Table 2: Proportion of examples 10-18 (parts by weight)

[0061]

[0062] Table 3: Proportion of comparative examples (parts by weight)

[0063]

[0064]

[0065] From Tables 1-3, it can be seen that the PVC alloy of the examples of the present application has high heat resistance and high modulus. The amount of heat stabilizer added in Comparative Example 1 and Comparative Example 2 is not within the scope of the present application, the weight ratio of calcium-zinc stabilizer and beta-diketone added in Comparative Example 3 and Comparative Example 4 is not within the scope of the present application, Comparative Example 5 uses organic tin stabilizer, and the heat resistance and modulus of the PVC alloy of Comparative Examples 1-5 are not as good as Example 1. The weight ratio of MBS and chlorinated polyethylene added in Comparative Examples 6 and 7 is not within the scope of the present application, and the heat resistance and modulus of the PVC alloy of Comparative Examples 6 and 7 are not as good as Example 1. Therefore, the present application uses heat stabilizer calcium-zinc stabilizer and beta-diketone compounded in proportion, and toughening agent MBS and chlorinated polyethylene compounded in proportion, so that the PVC alloy has high heat resistance and high modulus.

Claims

1. A high heat resistant, high modulus PVC alloy, characterized in that, The PVC alloy component comprises, by weight fraction: The heat stabilizer is calcium-zinc stabilizer and β-diketone in a weight ratio of 2.5:1-8:1; the calcium-zinc stabilizer comprises at least one of calcium stearate and calcium maleate and at least one of zinc stearate and zinc maleate; the β-diketone comprises one or more of dibenzoylmethane, hard acyl benzoylmethane and acetylacetone; The toughening agent is MBS and chlorinated polyethylene in a weight ratio of 1:1-5:

1.

2. The PVC alloy of claim 1, wherein, The PVC alloy component comprises, by weight fraction:

3. The PVC alloy of claim 1, wherein, The ABS impact strength is 25-35 KJ / m 2 .

4. The PVC alloy of claim 1, wherein, The weight ratio of the calcium-zinc stabilizer and β-diketone is 3:1-5:1; the weight ratio of MBS and chlorinated polyethylene is 2.5:1-4:

1.

5. The PVC alloy of claim 1, wherein, The lubricant comprises one or more of polyethylene wax, stearic acid and paraffin wax; the filler comprises one or more of calcium carbonate, barium sulfate and talc.

6. The PVC alloy of claim 1, wherein, The PVC alloy further comprises other auxiliary agents in an amount of 0-6 parts; the other auxiliary agents comprise one or more of flame retardants and antioxidants.

7. A method for preparing the PVC alloy according to any one of claims 1-6, comprising: mixing the components, and extruding the obtained mixture in a twin-screw extruder to obtain the high-heat-resistance and high-modulus PVC alloy.

8. The preparation method according to claim 7, characterized in that, The temperature of each section of the twin-screw extruder is 80-150°C, and the length-diameter ratio of the screw is 28:1-36:

1.

9. Use of the PVC alloy according to any one of claims 1-6 in electronic and electrical products, household appliances or power tools.

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