PVC waterproof coiled material and preparation method thereof

Abstract

The invention provides a PVC waterproof coiled material and a preparation method thereof. The PVC waterproof coiled material comprises the following powdery raw materials: 50-55 parts of PVC resin; 15 to 20 parts of active calcium; 5-10 parts of titanium dioxide; 1.5-2 parts of a calcium-zinc stabilizer; 20 to 22.5 parts of dioctyl phthalate; 0.8 to 1 part of stearic acid; 1.2 to 2.5 parts of barium stearate; 1.2 to 2.5 parts of calcium stearate; 2 to 2.5 parts of a PVC auxiliary agent; the preparation method comprises the steps of mixing, screw extrusion, rolling, shaping, cooling, stress relief and rolling. The prepared PVC waterproof coiled material is excellent in performance, and the problem that unqualified products are easy to produce through granular materials can be avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterproof coiled materials, and particularly relates to a PVC waterproof coiled material and a preparation method thereof. Background Art

[0002] In the production process of existing PVC waterproof coiled materials, in order to improve production efficiency, pre-processed plastic particles are directly added to the screw, and are prepared through processes such as heating and extrusion, subsequent forming, and winding. The pre-processed granular materials may have problems such as unqualified tensile strength and elongation rate, which easily lead to unqualified quality of the produced waterproof coiled materials. Moreover, because the unqualified granular materials can only be directly added to the screw for extrusion without a mixing step, that is, the performance of the produced waterproof coiled materials cannot be improved to reach the qualified standard by adding ingredients. Therefore, if the performance of the granular materials in the same batch is unqualified, they can only be scrapped and cannot be used for producing waterproof coiled materials, resulting in material waste. Therefore, improvements are needed to provide a high-performance PVC waterproof coiled material prepared from powder materials. Summary of the Invention

[0003] In order to solve the above-mentioned defects of the prior art, the present application provides a PVC waterproof coiled material and a preparation method thereof, which can prepare a PVC waterproof coiled material with excellent performance from powder materials, avoiding the problem of easily producing unqualified products through granular materials.

[0004] To achieve the above object, the present invention adopts the following technologies: A PVC waterproof coiled material is prepared from the following powdery raw materials in parts by weight: 50 parts to 55 parts of PVC resin; 15 parts to 20 parts of active calcium; 5 parts to 10 parts of titanium dioxide; 1.5 parts to 2 parts of calcium-zinc stabilizer; 20 parts to 22.5 parts of dioctyl phthalate; 0.8 part to 1 part of stearic acid; 1.2 parts to 2.5 parts of barium stearate; 1.2 parts to 2.5 parts of calcium stearate; 2 parts to 2.5 parts of PVC auxiliary agent.

[0005] Further, the PVC resin is 55 parts, the active calcium is 20 parts, the titanium dioxide is 5 parts, the calcium-zinc stabilizer is 2 parts, the dioctyl phthalate is 22.5 parts, the stearic acid is 1 part, the barium stearate is 2 parts, the calcium stearate is 2 parts, and the PVC auxiliary agent is 1.8 parts.

[0006] A preparation method of a PVC waterproof coiled material for preparing the above-mentioned PVC waterproof coiled material includes the following steps: S1. Add PVC resin, active calcium, titanium dioxide, calcium-zinc stabilizer, and dioctyl phthalate by weight parts into a stirring tank, and stir for a preset time. S2. Add stearic acid, barium stearate, calcium stearate, and PVC additives by weight parts, and continue to stir for a preset time. S3. Drain the mixture in the stirring tank and cool it to room temperature. S4. Feed the mixture into a screw extrusion device and extrude a diaphragm through an extrusion die. S5. Feed the diaphragm into a calendering mechanism for calendering and forming, and then perform shaping and cooling. S6. Pull it to a stress relief roller to eliminate stress and then wind it up.

[0007] Further, the stirring speed of the stirring tank in step S1 is 800 revolutions per minute, and stop stirring when the material is stirred to a temperature of 80°C - 90°C.

[0008] Further, the stirring speed in step S2 is 200 revolutions per minute, and stir until the material temperature drops to 50°C - 60°C.

[0009] Further, the heating temperature of the screw extrusion device in step S3 is 170°C - 190°C, and the heating temperature of the extrusion die is 190°C - 200°C.

[0010] Further, the cooling method in step S5 is to pull the shaped diaphragm to multiple spreading rollers for natural cooling, then pull it into a pool for immersion cooling, and finally pull it to a storage rack for natural cooling and drying.

[0011] The beneficial effects of the present invention are as follows: The PVC waterproof coil prepared by the formula and preparation method of this application has excellent performance, and its tensile strength, elongation rate, and tear strength can even exceed the qualified standard by more than 10%, which can effectively avoid the problem of easily producing unqualified products when producing PVC waterproof coils through particles at present. Specific Embodiments

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following details the embodiments of the present invention. However, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0013] Example 1 Add 50 parts by weight of PVC resin, 15 parts of active calcium, 5 parts of titanium dioxide, 1.5 parts of calcium-zinc stabilizer, and 20 parts of dioctyl phthalate into the mixing tank, and stir at a stirring speed of 800 revolutions per minute to heat the powdery raw materials by high-speed stirring to 80 °C. Then add 0.8 parts of stearic acid, 1.2 parts of barium stearate, 1.2 parts of calcium stearate, and 2 parts of PVC additives into the mixing tank by weight, and continue to stir for a preset time at a stirring speed of 200 revolutions per minute to reduce the material temperature to 50 °C; discharge the mixture in the mixing tank, cool it to room temperature and send it to the storage tank for storage. Then send the mixture from the storage tank to the screw extrusion equipment, extrude the film through the extrusion die, and send the film to the calendering mechanism for calendering and forming. Then carry out shaping and cooling, and then pull it to the stress relief roller to eliminate stress and then wind it up to obtain a rolled waterproof coiled material.

[0014] Specifically, the heating temperature of the screw extrusion equipment is controlled at 170 °C, and the heating temperature of the extrusion die is controlled at 190 °C.

[0015] Specifically, the cooling method after shaping is to pull the shaped film to multiple spreading rollers for natural cooling, then pull it into a pool for immersion cooling, and finally pull it to the storage rack for natural cooling and drying.

[0016] Specifically, the calendering mechanism includes 3 calendering rollers arranged in parallel from top to bottom. After the film is calendered through the gap between the two lower calendering rollers, it enters the gap between the two upper calendering rollers for calendering again, and the calendering effect is improved by calendering twice through 3 calendering rollers. More specifically, during the calendering process, the temperature of the two lower calendering rollers is 70 °C, and the temperature of the uppermost calendering roller is 65 °C.

[0017] Example 2 Add 55 parts by weight of PVC resin, 20 parts of active calcium, 5 parts of titanium dioxide, 2 parts of calcium-zinc stabilizer, and 20 parts of dioctyl phthalate into the mixing tank, and stir at a stirring speed of 800 revolutions per minute to heat the powdery raw materials by high-speed stirring to 80 °C. Then add 0.8 parts of stearic acid, 1.2 parts of barium stearate, 1.2 parts of calcium stearate, and 2 parts of PVC additives into the mixing tank by weight, and continue to stir for a preset time at a stirring speed of 200 revolutions per minute to reduce the material temperature to 50 °C; discharge the mixture in the mixing tank, cool it to room temperature and send it to the storage tank for storage. Then send the mixture from the storage tank to the screw extrusion equipment, extrude the film through the extrusion die, and send the film to the calendering mechanism for calendering and forming. Then carry out shaping and cooling, and then pull it to the stress relief roller to eliminate stress and then wind it up to obtain a rolled waterproof coiled material.

[0018] Specifically, the heating temperature of the screw extrusion equipment is controlled at 170 °C, and the heating temperature of the extrusion die is controlled at 190 °C.

[0019] Specifically, the cooling method after shaping is to pull the shaped diaphragm onto multiple spreading rollers for natural cooling, then pull it into a pool for immersion cooling, and finally pull it onto a storage rack for natural cooling and drying.

[0020] Specifically, the calendering mechanism includes three calendering rollers arranged in parallel from top to bottom. After the diaphragm is calendered through the gap between the two lower calendering rollers, it enters the gap between the two upper calendering rollers for another calendering. Calendering twice through three calendering rollers improves the calendering effect. More specifically, during the calendering process, the temperature of the two lower calendering rollers is 70 °C, and the temperature of the uppermost calendering roller is 65 °C.

[0021] Example 3 In a stirring tank, add 50 parts by weight of PVC resin, 20 parts of active calcium, 10 parts of titanium dioxide, 1.5 parts of calcium-zinc stabilizer, and 22 parts of dioctyl phthalate. Stir at a stirring speed of 800 revolutions per minute to heat the powdery raw materials by high-speed stirring to 90 °C. Add 1 part of stearic acid, 2.5 parts of barium stearate, 2.5 parts of calcium stearate, and 2.5 parts of PVC auxiliary agent by weight in the stirring tank, and continue to stir for a preset time at a stirring speed of 200 revolutions per minute to reduce the material temperature to 60 °C; discharge the mixture in the stirring tank, cool it to room temperature, and send it to a storage tank for storage. Then, send the mixture from the storage tank to a screw extrusion device, extrude a diaphragm through an extrusion die, and send the diaphragm to the calendering mechanism for calendering and forming. Then, perform shaping and cooling, and then pull it to a stress relief roller to eliminate stress and then wind it up to obtain a rolled waterproof coiled material.

[0022] Specifically, the heating temperature of the screw extrusion device is controlled at 190 °C, and the heating temperature of the extrusion die is controlled at 200 °C.

[0023] Specifically, the cooling method after shaping is to pull the shaped diaphragm onto multiple spreading rollers for natural cooling, then pull it into a pool for immersion cooling, and finally pull it onto a storage rack for natural cooling and drying.

[0024] Specifically, the calendering mechanism includes three calendering rollers arranged in parallel from top to bottom. After the diaphragm is calendered through the gap between the two lower calendering rollers, it enters the gap between the two upper calendering rollers for another calendering. Calendering twice through three calendering rollers improves the calendering effect. More specifically, during the calendering process, the temperature of the two lower calendering rollers is 75 °C, and the temperature of the uppermost calendering roller is 70 °C.

[0025] Example 4 Add 55 parts by weight of PVC resin, 20 parts of active calcium, 5 parts of titanium dioxide, 2 parts of calcium-zinc stabilizer, and 22.5 parts of dioctyl phthalate into the stirring tank, and stir at a stirring speed of 800 revolutions per minute to heat the powdery raw materials by high-speed stirring to 90 °C. Then add 1 part of stearic acid, 2 parts of barium stearate, 2 parts of calcium stearate, and 1.8 parts of PVC auxiliary agent into the stirring tank by weight, and continue to stir for a preset time at a stirring speed of 200 revolutions per minute to reduce the material temperature to 60 °C; discharge the mixture in the stirring tank, cool it to room temperature and send it to the storage tank for storage. Then send the mixture from the storage tank to the screw extrusion equipment, extrude the film through the extrusion die, and send the film to the calendering mechanism for calendering and forming. Then carry out shaping and cooling, and then traction to the stress relief roller to eliminate stress and then wind up to obtain a wound waterproof coiled material.

[0026] Specifically, the heating temperature of the screw extrusion equipment is controlled at 190 °C, and the heating temperature of the extrusion die is controlled at 200 °C.

[0027] Specifically, the cooling method after shaping is to traction the shaped film to multiple paving rollers for natural cooling, then traction it into the pool for immersion cooling, and finally traction it to the storage rack for natural cooling and drying.

[0028] Specifically, the calendering mechanism includes 3 calendering rollers arranged in parallel from top to bottom. After the film is calendered through the gap between the two lower calendering rollers, it enters the gap between the two upper calendering rollers for calendering again, and the calendering effect is improved by calendering twice through 3 calendering rollers. More specifically, during the calendering process, the temperature of the two lower calendering rollers is 75 °C, and the temperature of the topmost calendering roller is 70 °C.

[0029] Carry out tensile strength, elongation rate, and tear strength tests on the waterproof coiled materials prepared in Examples 1-4, and the test results are shown in Table 1: Table 1 Test Results It can be seen from Table 1 that the tensile strength of the waterproof coiled materials prepared in Examples 1-4 is greater than 10 MPa, the elongation rate is greater than 200, and the tear strength is greater than 50 N / mm, all reaching above the qualified standard. Moreover, the tensile strength of the waterproof coiled material prepared in Example 4 is 16.5 MPa, the elongation rate is 235, and the tear strength is 57 N / mm, all exceeding the qualified standard by more than 10%, and the performance is the best.

[0030] The above are only the preferred embodiments of the present invention, and do not represent the only or limit the present invention. Those skilled in the art should understand that without departing from the scope of the present invention, various changes or equivalent replacements made to the present invention all belong to the scope of protection of the present invention.

Claims

1. A PVC waterproof coiled material, characterized in that, Prepared from the following powdery raw materials in parts by weight: 50 to 55 parts of PVC resin; Active calcium 15 to 20 parts; 5 to 10 parts of titanium dioxide; 1.5 to 2 parts of calcium zinc stabilizer; 20 to 22.5 parts of dioctyl ester; 0.8 to 1 part of stearic acid; 1.2 to 2.5 parts of barium stearate; 1.2 to 2.5 parts of calcium stearate; PVC additives 2 to 2.5 parts.

2. A PVC waterproof coiled material according to claim 1, characterized in that, PVC resin is 55 parts, active calcium is 20 parts, titanium dioxide is 5 parts, calcium zinc stabilizer is 2 parts, dioctyl ester is 22.5 parts, stearic acid is 1 part, barium stearate is 2 parts, calcium stearate is 2 parts, and PVC additives are 1.8 parts.

3. A method for preparing a PVC waterproof coiled material, which is used to prepare the PVC waterproof coiled material described in any one of claims 1-2, and is characterized in that, The following steps are involved: S1. Add PVC resin, active calcium, titanium dioxide, calcium zinc stabilizer and dioctyl ester into a mixing tank according to weight ratio and stir for a preset time; S2. Add stearic acid, barium stearate, calcium stearate and PVC additive according to weight ratio and continue stirring for a preset time; S3, discharging the mixture in the mixing tank and cooling it to room temperature; S4, feeding the mixed material into a screw extruder and extruding a film through an extrusion die; S5, sending the film into the calendering mechanism for calendering, and then shaping and cooling; S6, pulling to the stress relief roller to eliminate stress and then winding.

4. The preparation method of a PVC waterproof coiled material according to claim 3, characterized in that, In step S1, the stirring speed of the stirring tank is 800 rpm, and the stirring is stopped when the material is stirred to a temperature of 80°C-90°C.

5. A method for preparing a PVC waterproof coiled material according to claim 4, characterized in that, In step S2, the stirring speed is 200 rpm, and the stirring is performed until the material temperature drops to 50°C-60°C.

6. The preparation method of a PVC waterproof coiled material according to claim 3, characterized in that, In step S3, the heating temperature of the screw extruder is 170°C-190°C, and the heating temperature of the extrusion die is 190°C-200°C.

7. A method for preparing a PVC waterproof coil according to claim 3, characterized in that, The cooling method in step S5 is to pull the shaped membrane onto a plurality of spreading rollers for natural cooling, then tow it into a water pool for immersion cooling, and finally tow it to a storage rack for natural cooling and drying.

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