Heat-resistant polyvinyl chloride composite material and preparation method thereof

Abstract

The invention discloses a heat-resistant polyvinyl chloride composite material and a preparation method thereof, and belongs to the technical field of high polymer materials. The chlorinated polyvinyl chloride material is prepared from the following components in parts by weight: 100 parts of chlorinated polyvinyl chloride resin, 4-8 parts of a heat stabilizer, 1-2 parts of a lubricant, 5-20 parts of polyvinyl chloride resin, 2-6 parts of a processing aid, 4-10 parts of an impact modifier and 6-10 parts of calcium carbonate, the preparation method comprises the following steps: uniformly mixing chlorinated polyvinyl chloride resin, a heat stabilizer and polyvinyl chloride resin at a low speed, raising the temperature to 30-50 DEG C, adding a lubricant, uniformly mixing at a low speed, raising the temperature to 70-85 DEG C, adding a processing aid, an impact modifier and calcium carbonate, uniformly mixing at a high speed, raising the temperature to 110-125 DEG C, discharging the obtained mixture, cooling to 45 DEG C or below, and carrying out extrusion molding to obtain the product. The heat-resistant polyvinyl chloride composite material has the advantages of lower plasticizing time, lower processing temperature, higher impact strength, higher tensile strength, higher vicat temperature and better comprehensive performance.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and particularly relates to a heat-resistant polyvinyl chloride composite material and a preparation method thereof. Background Art

[0002] Polyvinyl chloride (PVC) is a widely used thermoplastic resin, but its poor thermal stability and heat resistance often require composite modification to improve its performance and application range. PVC has a softening temperature of 78°C. When PVC is mixed with other polymers, inorganic materials, or glass fiber in a certain proportion, the performance of the blend (full compatibility) is improved compared to PVC, with a heat resistance of approximately 120°C. However, as these composite modified materials improve heat resistance and tensile strength, they also become more brittle, have lower impact strength, and are more difficult to process, sometimes even difficult to process. Summary of the Invention

[0003] The purpose of the present invention is to provide a heat-resistant polyvinyl chloride composite material and a preparation method thereof.

[0004] The heat-resistant polyvinyl chloride composite material of the present invention comprises, by weight, 100 parts of chlorinated polyvinyl chloride resin, 4 to 8 parts of heat stabilizer, 1 to 2 parts of lubricant, 5 to 20 parts of polyvinyl chloride resin, 2 to 6 parts of processing aid, 4 to 10 parts of impact modifier, and 6 to 10 parts of calcium carbonate;

[0005] The heat stabilizer is a calcium zinc stabilizer, an organic tin stabilizer, or a mixture of two thereof;

[0006] The lubricant is one or a mixture of more than one of calcium stearate, stearic acid, and PE wax;

[0007] The processing aid is an acrylate processing aid;

[0008] The impact modifier is one of acrylate impact modifier and chlorinated polyethylene or a mixture of the two.

[0009] The preparation method of the heat-resistant polyvinyl chloride composite material of the present invention comprises the following steps:

[0010] (1) Weigh each component according to the weight ratio;

[0011] (2) adding chlorinated polyvinyl chloride resin, heat stabilizer and polyvinyl chloride resin into a high-speed mixer and mixing them at a low speed of 1000-2000 r / min until the temperature reaches 30-50°C;

[0012] (3) Add the lubricant to a high-speed mixer and mix at a low speed of 1000-2000 r / min until the temperature reaches 70-85°C;

[0013] (4) Adding a processing aid, an impact modifier, and calcium carbonate into a high-speed mixer, and mixing them at a high speed of 2500-3500 r / min until the temperature reaches 110-125° C.; then discharging the obtained mixture and cooling it to below 45° C. to obtain the heat-resistant polyvinyl chloride composite material. DETAILED DESCRIPTION

[0014] Example 1

[0015] The heat-resistant polyvinyl chloride composite material described in this embodiment is composed, by weight, of 100 parts of chlorinated polyvinyl chloride resin, 6 parts of heat stabilizer (containing 4 parts of calcium zinc stabilizer and 2 parts of organotin stabilizer), 1.6 parts of lubricant (containing 0.6 parts of calcium stearate, 0.5 parts of stearic acid and 0.5 parts of PE wax), 10 parts of polyvinyl chloride resin, 4 parts of acrylate processing aid, 10 parts of impact modifier (4 parts of acrylate impact modifier and 6 parts of chlorinated polyethylene), and 8 parts of calcium carbonate. The preparation steps are as follows:

[0016] (1) Weigh each component according to the weight ratio;

[0017] (2) Add chlorinated polyvinyl chloride resin, heat stabilizer (calcium zinc stabilizer and organic tin stabilizer), and polyvinyl chloride resin into a high-speed mixer and mix them at a low speed of 1500 r / min until the temperature reaches 40°C;

[0018] (3) Add lubricants (calcium stearate, stearic acid, and PE wax) into a high-speed mixer and mix at a low speed of 1500 r / min until the mixture reaches 80°C;

[0019] (4) Adding an acrylic processing aid, an impact modifier (acrylic impact modifier and chlorinated polyethylene), and calcium carbonate to a high-speed mixer and mixing at 3000 r / min until the mixture reaches 120° C.; discharging the resulting mixture and cooling it to below 45° C. to obtain the heat-resistant polyvinyl chloride composite material. The performance of the heat-resistant polyvinyl chloride composite material was tested, and the data were as follows:

[0020] Table 1: Performance data of the product of Example 1

[0021]

[0022] The data in Table 1 show that the heat-resistant polyvinyl chloride composite material prepared by the present invention has lower plasticizing time and processing temperature and higher impact strength, tensile strength and Vicat temperature, and has better comprehensive performance.

Claims

1. A heat-resistant polyvinyl chloride composite material, characterized in that: The invention comprises, by weight, 100 parts of chlorinated polyvinyl chloride resin, 4 to 8 parts of heat stabilizer, 1 to 2 parts of lubricant, 5 to 20 parts of polyvinyl chloride resin, 2 to 6 parts of processing aid, 4 to 10 parts of impact modifier, and 6 to 10 parts of calcium carbonate; the heat stabilizer is one or a mixture of two of a calcium zinc stabilizer and an organic tin stabilizer; the lubricant is one or a mixture of more than one of calcium stearate, stearic acid, and PE wax; the processing aid is an acrylate processing aid; and the impact modifier is one or a mixture of two of an acrylate impact modifier and chlorinated polyethylene.

2. The method for preparing a heat-resistant polyvinyl chloride composite material according to claim 1, characterized in that: The steps are as follows: (1) Weigh each component according to the weight ratio; (2) Add chlorinated polyvinyl chloride resin, heat stabilizer, and polyvinyl chloride resin into a high-speed mixer and mix at low speed until the temperature reaches 30-50°C; (3) Add the lubricant to a high-speed mixer and mix at low speed until the temperature reaches 70-85°C; (4) Adding a processing aid, an impact modifier, and calcium carbonate into a high-speed mixer and mixing them uniformly at a high speed to 110-125° C.; then discharging the obtained mixture and cooling it to below 45° C. to obtain the heat-resistant polyvinyl chloride composite material.

3. The method for preparing a heat-resistant polyvinyl chloride composite material according to claim 2, wherein: In step (2), the mixture is mixed at a low speed of 1000 to 2000 r / min until the temperature reaches 30 to 50°C.

4. The method for preparing a heat-resistant polyvinyl chloride composite material according to claim 2, wherein: In step (3), the mixture is mixed at a low speed of 1000 to 2000 r / min to a temperature of 70 to 85°C.

5. The method for preparing a heat-resistant polyvinyl chloride composite material according to claim 2, wherein: In step (4), the mixture is mixed at a high speed of 2500 to 3500 r / min to a temperature of 110 to 125°C.

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