Weather-resistant PVC (polyvinyl chloride) coiled material as well as preparation method and application thereof

Abstract

The invention relates to a weather-resistant PVC (polyvinyl chloride) coiled material which is formed by compounding a surface layer and a base layer, the surface layer is made of a nitrile rubber modified PVC material or a modified acrylic acid material, and the base layer is made of a PVC material. The material disclosed by the invention is good in weather resistance and mechanical property, high in cost performance and high in processing feasibility, and a reliable material solution is provided for an outdoor sports field.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high polymer materials, and particularly relates to a weather-resistant PVC coiled material and a preparation method and application thereof. BACKGROUND

[0002] Polyvinyl chloride (PVC) coiled material is widely used in outdoor sports fields due to its low cost and easy processing. However, the traditional PVC material is prone to surface oiling, embrittlement and cracking under the long-term action of ultraviolet light and ozone.

[0003] In view of the above problems, the prior art proposes to use additives to solve the problems, but a single additive can only solve the corresponding problem, and the addition of too many additives will affect the basic performance of the coiled material. SUMMARY

[0004] The purpose of the present application is to provide a weather-resistant PVC coiled material with good weathering performance and mechanical properties, and a preparation method and application thereof.

[0005] The application adopts the following technical solutions: A weather-resistant PVC coiled material is composed of a surface layer and a base layer; the surface layer is a nitrile rubber modified PVC material or a modified acrylic material, and the base layer is a PVC material.

[0006] Further, the thickness of the surface layer is 0.5-0.8 mm, and the thickness of the base layer is 1.2-1.5 mm.

[0007] Further, the nitrile rubber modified PVC material comprises the following components by weight: 40-60 parts of polyvinyl chloride resin, 15-22 parts of powder nitrile rubber, 1-1.5 parts of dicumyl peroxide (DCP), 0.5-1 part of triallyl isocyanurate (TAIC), 2.5-4.0 parts of weathering agent, 3-8 parts of titanium white, 4-6 parts of calcium-zinc stabilizer, and 20-28 parts of plasticizer.

[0008] Further, the particle size of the powder nitrile rubber is 80-120 mesh, and the acrylonitrile content is 28-34%.

[0009] Further, the plasticizer is a DOP or DOTP plasticizer.

[0010] Further, the weathering agent comprises DPDP (diphenyl isodecyl phosphate) and UV-P (ultraviolet absorber, which can effectively absorb ultraviolet light with a wavelength of 270-280 nm) in a mass ratio of 4-6:1.

[0011] Further, the PVC material of the base layer comprises the following components by weight: 100 parts of PVC resin, 40 parts of calcium carbonate, 25 parts of DOP or DOTP plasticizer, and 3 parts of calcium-zinc stabilizer.

[0012] A preparation method of the weather-resistant PVC coiled material, comprising the following steps: (1) Put the polyvinyl chloride resin, powdered nitrile rubber, weather-resistant agent, and titanium dioxide into a high-speed mixer, and first mix at 250 rpm for 3 minutes; when the temperature is raised to 90°C, add the plasticizer and calcium-zinc stabilizer, and mix at a speed of 450-500 rpm until the temperature reaches 120°C; then put the mixture into a mixing machine after adding dicumyl peroxide and triallyl isocyanurate, and set the torque to 50 N·m, and the granulation temperature to 165-175°C to obtain the surface layer granules.

[0013] (2) Mix the components of the PVC material of the base layer, i.e., PVC resin, calcium carbonate, plasticizer, and calcium-zinc stabilizer, uniformly at 140-150°C, and then perform single-screw extrusion granulation to obtain the base layer granules.

[0014] (3) Melt the surface layer granules and the base layer granules separately.

[0015] (4) Compound the melts in a three-roll calender.

[0016] (5) After cooling and setting, wind up.

[0017] Further, the modified acrylic material comprises the following components by weight: 40-60 parts of modified acrylic emulsion, 20-30 parts of inorganic resin, 15-25 parts of inorganic mineral, 3-5 parts of weather-resistant agent, 1.0-1.8 parts of aziridine crosslinking agent, and 0.5-1.0 parts of wet dispersing agent.

[0018] A preparation method of the weather-resistant PVC coiled material, comprising the following steps: (1) Stir and mix the modified acrylic emulsion and the inorganic resin.

[0019] (2) Add the weather-resistant agent and the wet dispersing agent to the mixture, and perform ultrasonic dispersion.

[0020] (3) Add the inorganic mineral to the system.

[0021] (4) Further add the aziridine crosslinking agent to the system, and stir to obtain the surface layer material.

[0022] (5) Directly calender the base layer PVC material.

[0023] (6) Preheat the base layer PVC, and blade coat the surface layer material.

[0024] (7) Hot air curing.

[0025] (8) Calender roll shaping.

[0026] Application of the weather-resistant PVC coiled material in sports floor.

[0027] The application has the beneficial effects that the powder nitrile rubber physical crosslinking network and the weathering agent are used in the surface layer to synergistically act, significantly blocking the erosion of ultraviolet and ozone on the PVC molecules. In addition, the modified acrylic surface layer can achieve high weather resistance through the organic-inorganic hybrid structure. The double-layer composite structure of the surface layer and the base layer is adopted to achieve a breakthrough in weather resistance, physical properties and service life, and at the same time, high cost performance and processing feasibility are achieved, which provides a reliable material solution for outdoor sports grounds. DETAILED DESCRIPTION

[0028] The technical solutions of the application will be described in detail below through specific examples.

[0029] Example 1 (1) Put 50 kg of polyvinyl chloride resin (SG-5), 20 kg of powder nitrile rubber (PNBR-II), 2.9 kg of weathering agent (DPDP), 0.6 kg of UV-P, 6 kg of titanium dioxide (R-706) into a high-speed mixer, first mix at 250 rpm for 3 minutes; when the temperature is raised to 90℃, add 25 kg of DOP plasticizer and 4.5 kg of calcium-zinc stabilizer (BP MC 90214), and mix at a speed of 450~500 rpm until the temperature reaches 120℃; then put the mixture into a mixing machine, add 1.2 kg of dicumyl peroxide (DCP) and 0.8 kg of triallyl isocyanurate (TAIC), and the torque is 50 N·m, the granulation temperature is 170℃, and the surface layer granules are obtained.

[0030] (2) Mix the components of the base layer PVC material: 100 kg of polyvinyl chloride resin (SG-3), 35 kg of calcium carbonate (1250 mesh), 28 kg of DOTP plasticizer, and 3.5 kg of calcium-zinc stabilizer (WWP-G02) at 140~150℃, and single-screw extrusion granulation is performed to obtain the base layer granules.

[0031] (3) The surface layer granules and the base layer granules are respectively added into a single-screw extruder for melting (170~175℃).

[0032] (4) The melt is compounded in a three-roll calender: the upper roller temperature is 175℃, the middle roller temperature is 165℃, the lower roller temperature is 155℃, the pressure is 10 MPa, and the linear speed is 1.2 m / min.

[0033] (5) After cooling and shaping, the surface layer thickness is 0.6 mm, and the base layer thickness is 1.4 mm.

[0034] Example 2 (1) Put polyvinyl chloride resin (SG-5) 50 kg, powder nitrile rubber (PNBR-II) 20 kg, weather resistant agent (DPDP 2.9 kg, UV-P 0.6 kg), titanium white powder (R-706) 6 kg into a high-speed mixer, first mix at 250 rpm for 3 minutes; when the temperature is raised to 90°C, add DOTP plasticizer 23 kg and calcium-zinc stabilizer (BP MC 90214) 4.5 kg, increase the speed to 450~500 rpm and mix to 120°C to discharge; after adding dicumyl peroxide (DCP) 1.2 kg and triallyl isocyanurate (TAIC) 0.8 kg into the mixer, the torque is 50 N·m, the granulation temperature is 170°C, and the surface layer granules are obtained.

[0035] (2) Mix the components of the base layer PVC material: polyvinyl chloride resin (SG-3) 100 kg, calcium carbonate (1250 mesh) 35 kg, DOTP plasticizer 28 kg, calcium-zinc stabilizer (WWP-G02) 3.5 kg at 140~150°C, and single-screw extrusion granulation to obtain base layer granules.

[0036] (3) Put the surface layer granules and base layer granules into a single-screw extruder for melting (170~175°C).

[0037] (4) The melt enters a three-roll calender for compounding: the upper roller temperature is 175°C, the middle roller temperature is 165°C, the lower roller temperature is 155°C, the pressure is 10 MPa, and the linear speed is 1.2 m / min.

[0038] (5) After cooling and setting, wind up, the surface layer thickness is 0.6 mm, and the base layer thickness is 1.4 mm.

[0039] Example 3 (1) Mix modified acrylic emulsion (BA-206) 55 kg with silicate resin (modulus 3.2 sodium water glass) 25 kg at 40°C for 20 min.

[0040] (2) Add weather resistant agent (DPDP 3 kg, UV-P 1 kg) and wet dispersing agent (BYK-190) to the mixture, and ultrasonically disperse for 15 min at 40 kHz.

[0041] (3) Add barium sulfate 20 kg to the system, with nodular iron to D50=3 μm.

[0042] (4) Add aziridine crosslinking agent (XR-100) 1.2 kg to the system, and stir to obtain the surface layer material.

[0043] (5) The base layer PVC material was prepared with the same formulation as in Example 1. It was directly calendered to a thickness of 1.4 mm.

[0044] (6) The base layer PVC was preheated to 95°C, and the surface layer material was knife-coated with a wet film thickness of 1.0 mm.

[0045] (7) Hot air curing at 130°C for 8 min.

[0046] (8) Shaped with a calendering roller at 100°C and 8 MPa.

[0047] Example 4 (1) The modified acrylic emulsion (BA-206) 55 kg was mixed with the silicate resin (modulus 3.2 sodium water glass) 28 kg at 40°C for 20 min with stirring.

[0048] (2) The mixture was added with weathering agents (DPDP 3 kg, UV-P 1 kg) and wetting dispersant (BYK-190), and ultrasonically dispersed at 40 kHz for 15 min.

[0049] (3) Calcium carbonate 10 kg and quartz sand 10 kg were added to the system, with nodular iron to D50 = 3 μm.

[0050] (4) Nitrogen propylene crosslinking agent (XR-100) 1.5 kg was further added to the system with stirring, and the surface layer material was obtained.

[0051] (5) The base layer PVC material was prepared with the same formulation as in Example 1. It was directly calendered to a thickness of 1.4 mm.

[0052] (6) The base layer PVC was preheated to 95°C, and the surface layer material was knife-coated with a wet film thickness of 1.0 mm.

[0053] (7) Hot air curing at 125°C for 8 min.

[0054] (8) Shaped with a calendering roller at 100°C and 8 MPa.

[0055] Comparative Example The components of the base layer PVC material, polyvinyl chloride resin (SG-3) 100 kg, calcium carbonate (1250 mesh) 35 kg, DOTP plasticizer 28 kg, calcium-zinc stabilizer (WWP-G02) 3.5 kg, were uniformly mixed at 140-150°C, and directly calendered to a thickness of 2 mm.

[0056] Effect Example The materials obtained in Examples 1-4 and the comparative example were tested, and the results are shown in Table 1.

[0057] Table 1 Performance Test .

Claims

1. A weatherable PVC sheeting, characterized in that, It is composed of a surface layer and a base layer; the surface layer is nitrile rubber modified PVC material or modified acrylic material, and the base layer is PVC material.

2. The weatherable PVC sheeting of claim 1, wherein, The nitrile rubber modified PVC material comprises the following components by weight: 40-60 parts of polyvinyl chloride resin, 15-22 parts of powder nitrile rubber, 1-1.5 parts of dicumyl peroxide, 0.5-1 part of triallyl isocyanurate, 2.5-4.0 parts of weather resistant agent, 3-8 parts of titanium white, 4-6 parts of calcium-zinc stabilizer, and 20-28 parts of plasticizer.

3. The weatherable PVC sheeting of claim 2, wherein, The powder nitrile rubber has a particle size of 80-120 mesh and an acrylonitrile content of 28-34%.

4. The weatherable PVC sheeting of claim 2, wherein, The plasticizer is DOP or DOTP plasticizer.

5. The weatherable PVC sheeting of claim 1, wherein, The PVC material of the base layer comprises the following components by weight: 100 parts of polyvinyl chloride resin, 40 parts of calcium carbonate, 25 parts of DOP or DOTP plasticizer, and 3 parts of calcium-zinc stabilizer.

6. The weatherable PVC sheeting of claim 5, wherein, The modified acrylic material comprises the following components by weight: 40-60 parts of modified acrylic emulsion, 20-30 parts of inorganic resin, 15-25 parts of inorganic mineral, 3-5 parts of weather resistant agent, 1.0-1.8 parts of aziridine crosslinking agent, and 0.5-1.0 parts of wet dispersing agent.

7. The weatherable PVC sheeting of claim 2 or 6, wherein, The weather resistant agent comprises DPDP and UV-P in a mass ratio of 4-6:

1.

8. A process for the preparation of weatherable PVC sheeting as claimed in any one of claims 1 to 5, characterised in that, It comprises the following steps: (1) Put polyvinyl chloride resin, powder nitrile rubber, weather resistant agent, and titanium white into a high-speed mixer, first mix at 250 rpm for 3 minutes; when the temperature rises to 90℃, add plasticizer and calcium-zinc stabilizer, and mix at a speed of 450-500 rpm until the temperature reaches 120℃; then add dicumyl peroxide and triallyl isocyanurate into the mixer, set the torque to 50 N·m, and granulate at a temperature of 165-175℃ to obtain surface layer granules; (2) Mix the components of the base layer PVC material, i.e. PVC resin, calcium carbonate, plasticizer, and calcium-zinc stabilizer, uniformly at 140-150℃, and single-screw extrude and granulate to obtain base layer granules; (3) Melt the surface layer granules and the base layer granules separately; (4) Compound the melts in a three-roll calender; (5) After cooling and setting, wind up.

9. Use of the weather resistant PVC coiled material according to any one of claims 1-7 in sports flooring.