PVC / SAN alloy material and preparation method and application thereof

Abstract

The invention specifically discloses a PVC / SAN alloy material as well as a preparation method and application thereof, and belongs to the field of application of transparent flame-retardant materials. The PVC / SAN alloy material provided by the invention comprises the following components in parts by weight: 80-120 parts of polyvinyl chloride resin; 10 to 50 parts of SAN resin; 0.1 to 0.5 part of benzotriazole; 2-5 parts of a heat stabilizer; the content of AN in the SAN resin is 15-30%, and the polymerization degree of the polyvinyl chloride resin is 300-750. The invention fills the technical blank in the field of transparent PVC / SAN alloy materials, and provides the PVC / SAN alloy material which can meet high transparency and high weather resistance at the same time.

Description

Technical Field

[0001] The invention belongs to the application field of transparent flame retardant materials, and particularly relates to a PVC / SAN alloy material and a preparation method and application thereof. Background Art

[0002] PVC alloy material is a composite material made of polyvinyl chloride (PVC) as the main raw material, through physical blending or chemical grafting, adding auxiliary materials such as plasticizers, stabilizers, fillers, etc., and through mixing, hot melt blending, extrusion, surface treatment and other processes.

[0003] PVC alloy material has good corrosion resistance, wear resistance, fire resistance, insulation and other advantages. At the same time, PVC alloy material has high hardness and good impact resistance, which can inhibit deformation under high temperature and improve the impact strength during cutting. PVC alloy material is easy to process and can be made into products of various shapes and sizes according to needs. It has excellent weather resistance and can usually be used outdoors without coating.

[0004] PVC alloy products are widely used in the fields of automobiles, electronics, precision instruments, office equipment, packaging materials, building materials, etc. In the automotive industry, PVC alloy materials are used in instrument panels, wheel covers, air supply fans, battery packs, rear exhaust grilles, etc., as well as radiator grilles, lampshades, rearview mirrors, rear windows and other automotive exterior parts. In addition, in the construction field, PVC alloys are mainly used to make window frames, partitions, ceilings, wall panels and other interior and exterior panels; in furniture manufacturing, they are also widely used to make cabinets, dining tables, bookcases and other furniture; in the field of electronic appliances, PVC alloys are used in mobile phone cases, keyboards, game controllers and other products.

[0005] Although PVC alloy materials have many advantages and uses mentioned above, pure PVC cannot meet the above requirements, and additives need to be added to PVC to improve its physical properties. Adding various additives to transparent PVC alloy materials can easily reduce the transparency of PVC materials. Currently, there are very few improvements on transparent PVC alloy materials, and the existing technology has failed to provide a PVC / SAN alloy material that can simultaneously meet the requirements of high weather resistance and high transparency. Summary of the invention

[0006] The object of the present invention is to overcome the above technical defects and provide a PVC / SAN alloy material that can meet the requirements of high transparency and high weather resistance.

[0007] The present invention is achieved through the following technical solutions: A PVC / SAN alloy material, comprising the following components by weight: 80-120 parts of polyvinyl chloride resin; SAN resin 10-50 parts; 2-(2'-hydroxy-5'-methylphenyl)benzotriazole 0.1-0.5 part; 2-5 parts of heat stabilizer; The AN content in the SAN resin is 15-30wt%; The polymerization degree of the polyvinyl chloride resin is 300-750.

[0008] In the present invention, the method for determining the AN content in the SAN resin is a quantitative test using Fourier transform infrared spectroscopy (FTIR).

[0009] In the present invention, the polymerization degree of the polyvinyl chloride resin is determined according to GB / T 13662-2009 and the detection method is gel chromatography.

[0010] The minimum mass percentage of the polyvinyl chloride resin in the PVC / SAN alloy material is 60%.

[0011] The content of polyvinyl chloride resin in the PVC / SAN alloy material of the present invention is 80 parts, 81 parts, 82 parts, 83 parts, 84 parts, 85 parts, 90 parts, 95 parts, 100 parts, 110 parts, 115 parts, 120 parts, etc.

[0012] The polymerization degree of the polyvinyl chloride resin in the PVC / SAN alloy material of the present invention is 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675, 700, 725, 750 and the like.

[0013] The content of SAN resin in the PVC / SAN alloy material of the present invention is 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, etc.

[0014] The AN content of the SAN resin in the PVC / SAN alloy material of the present invention is 15wt%, 16wt%, 17wt%, 18wt%, 19wt%, 20wt%, 21wt%, 22wt%, 23wt%, 24wt%, 25wt%, 26wt%, 27wt%, 28wt%, 29wt%, 30wt% and the like.

[0015] The content of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole in the PVC / SAN alloy material of the present invention is 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, etc.

[0016] Preferably, the polyvinyl chloride resin is rigid polyvinyl chloride, and the degree of polymerization of the polyvinyl chloride resin is 600-650.

[0017] Preferably, the AN content in the SAN resin is 20-25wt%.

[0018] Preferably, the heat stabilizer is selected from at least one of an organic tin stabilizer and a calcium zinc stabilizer.

[0019] The thermal stabilizer is more preferably an organotin stabilizer.

[0020] Specifically, the organotin stabilizer is selected from methyltin mercaptan.

[0021] Those skilled in the art can add, according to actual needs, 3-8 parts of toughening agent and 1-3 parts of lubricant by weight.

[0022] Preferably, the toughening agent is selected from any one or more of MBS toughening agents, CPE toughening agents or ACR toughening agents.

[0023] The toughening agent is more preferably an MBS toughening agent.

[0024] Preferably, the lubricant is selected from any one or more of polyethylene wax, ester lubricant, stearic acid lubricant, amide lubricant or EBS lubricant.

[0025] The invention provides a preparation method of the PVC / SAN alloy material, comprising the following steps: weighing PVC resin, a heat stabilizer and a lubricant, adding them into a high-speed mixer, and heating and mixing them to 90-110° C.; adding SAN resin and a toughening agent, mixing for 1-5 minutes, discharging the mixed powder in the high-speed mixer into a low-speed mixer, cooling the mixed powder to 80° C., feeding the mixed powder into an extruder screw for granulation, and obtaining the PVC / SAN alloy material.

[0026] The present invention provides the application of the PVC / SAN alloy material for manufacturing transparent parts in the fields of building materials, sanitary ware and household appliances.

[0027] The present invention has the following beneficial effects: Under the premise of maintaining the transparent property of PVC material, the present invention selects SAN resin with a specific number and a specific AN content and PVC resin to form a PVC / SAN alloy material, and the SAN resin can increase the heat deformation temperature of the PVC / SAN resin. At the same time, the PVC / SAN alloy material provided by the present invention has high weather resistance under the condition of high transparency. The component formula provided by the present invention fills the gap in the field of transparent PVC alloy materials and further enriches the scenarios of PVC alloy materials. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0029] The raw materials used in the present invention come from: PVC resin-1: PVC S-50, degree of polymerization 350-400, Formosa Plastics.

[0030] PVC resin-2: PVC powder S400, degree of polymerization 450-500, Japan Kanebuchi.

[0031] PVC resin-3: PVC B-57, degree of polymerization 600-650, Formosa Plastics.

[0032] PVC resin-4: PVC DG-800, degree of polymerization 800-850, Dagu.

[0033] SAN resin-1: SAN 310 NR TR, AN content 18wt%, Kumho.

[0034] SAN resin-2: DG-AS106, AN content 20wt%, Tianjin Dagu.

[0035] SAN resin-3: SAN-327, AN content 23wt%, Daqing Petrochemical.

[0036] SAN resin-4: SAN-355, AN content 25wt%, Daqing Petrochemical.

[0037] SAN resin-5: SAN-10, AN content 10wt%, blonde.

[0038] SAN resin-6: SAN-37, AN content 37wt%, blonde.

[0039] 2-(2'-Hydroxy-5'-methylphenyl)benzotriazole: RIASORB UV-P, RIASORB.

[0040] 2-(2'-Hydroxy-3', 5'-dicumylphenyl)benzotriazole: RIASORB UV-234, Rianlon.

[0041] 2-Hydroxy-4-methoxybenzophenone: UV-9, Nanjing Milan Chemical.

[0042] Methyltin mercaptan: organic tin stabilizer, SW-977 methyltin mercaptan, Hubei Benxing.

[0043] Calcium zinc stabilizer: DA-90391, Dongguan Zhenzhong.

[0044] MBS toughening agent: BTA717, Dow Chemical.

[0045] CPE toughening agent: CPE-132C, Hangzhou Keli.

[0046] ACR toughening agent: KM-355P, Dow Chemical.

[0047] Polyethylene wax: 617A, Honeywell.

[0048] The preparation method of the PVC / SAN alloy material of the embodiment and comparative example is as follows: PVC resin, heat stabilizer and lubricant are weighed and added into a high-speed mixer, and heated and mixed to 100° C.; SAN resin and toughening agent are added, and after mixing for 5 minutes, the mixed powder in the high-speed mixer is discharged into a low-speed mixer, and after cooling to 80° C., the mixed powder is fed into the screw of the extruder for granulation to obtain the PVC / SAN alloy material.

[0049] Various test methods: (1) HDT test standard: ASTM D1525, condition 0.45MPa.

[0050] (2) Transparency test: color plate injection molding process, temperature 175℃, speed and pressure 50% and 65% respectively, mold temperature ≤50℃, color plate size: 80*40*1mm, color plate front side smooth surface, back side leather texture surface, test transmittance and haze.

[0051] (3) Weathering color difference: The color difference of the samples was tested according to ISO 4892 standard. The PVC composition was treated with a daylight filter, 102 min of illumination + 18 min of spraying, the irradiance was (0.51±0.02) W / (m2*nm)@340nm, the black mark temperature was (65±3)°C, the box temperature was (38±3)°C, the relative humidity was (50±10)%, the test was conducted for 1000 h, and then the color difference test was conducted.

[0052] Table 1: Weight content of each component of PVC / SAN alloy material in Examples 1-9 and test results Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 PVC resin-1 100 100 100 100 PVC resin-2 100 PVC resin-3 100 100 80 120 SAN resin-1 20 20 20 20 SAN resin-2 20 SAN resin-3 20 50 10 SAN resin-4 20 2-(2'-Hydroxy-5'-methylphenyl)benzotriazole 0.3 0.3 0.3 0.3 0.1 0.5 0.3 0.3 0.3 Methyltin mercaptan 3 3 3 3 5 2 3 3 Calcium zinc stabilizer 3 MBS toughening agent 5 5 5 5 3 5 5 CPE toughening agent 5 ACR toughening agent 5 Polyethylene wax 2 2 2 2 1 3 2 2 2 HDT,℃(0.45Mpa) 74 74 75 74 74 73 72 71 71 Transmittance, % 83% 85% 88% 86% 82% 80% 81% 80% 82% Haze 15% 13% 8% 10% 12% 14% 18% 20% 19% Weather resistance color difference 3.1 3.3 2.8 3.0 3.5 3.0 3.5 3.6 3.8 It can be seen from Examples 1-9 that the PVC / SAN alloy material provided by the present invention has a transmittance of more than 80%, a haze of less than 20%, and a weathering color difference of less than 4.0, which is a PVC / SAN alloy material with high transparency, low haze and high weathering resistance.

[0053] Table 2: Weight content of each component and test results of PVC / SAN alloy materials in comparative examples 1-5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 PVC resin-1 100 100 100 100 PVC resin-4 100 SAN resin-1 20 20 20 SAN resin-5 20 SAN resin-6 20 2-(2'-Hydroxy-5'-methylphenyl)benzotriazole 0.3 0.3 0.3 2-(2'-Hydroxy-3', 5'-dicumylphenyl)benzotriazole 0.3 2-Hydroxy-4-methoxybenzophenone 0.3 Methyltin mercaptan 3 3 3 3 3 MBS toughening agent 5 5 5 5 5 Polyethylene wax 2 2 2 2 2 HDT,℃(0.45Mpa) 67 65 68 68 66 Transmittance, % 50% 55% 58% 60% 58% Haze 50% 48% 48% 39% 40% Weather resistance color difference 4.1 4.5 4.3 4.2 4.3 The AN content of the SAN resin selected in Comparative Example 1-2 does not fall within the range of 15-30 wt %.

[0054] The degree of polymerization of the PVC resin selected in Comparative Example 3 does not fall within the range of 300-750.

[0055] Comparative Example 4-5: 2-(2'-hydroxy-3', 5'-dicumylphenyl)benzotriazole, 2-Hydroxy-4-methoxybenzophenone The light transmittance of the PVC / SAN alloy material obtained by replacing 2-(2'-hydroxy-5'-methylphenyl)benzotriazole as the raw material is less than 80%, the haze is greater than 20%, and the weathering color difference is increased compared with the example, which means that the weathering performance is reduced.

Claims

1. A PVC / SAN alloy material, characterized in that: By weight, it includes the following components: 80-120 parts of polyvinyl chloride resin; SAN resin 10-50 parts; 2-(2'-hydroxy-5'-methylphenyl)benzotriazole 0.1-0.5 part; 2-5 parts of heat stabilizer; The AN content in the SAN resin is 15-30wt%; The polymerization degree of the polyvinyl chloride resin is 300-750.

2. A PVC / SAN alloy material according to claim 1, characterized in that: The polyvinyl chloride resin is rigid polyvinyl chloride, and the polymerization degree of the polyvinyl chloride resin is 600-650.

3. A PVC / SAN alloy material according to claim 1, characterized in that: The AN content in the SAN resin is 20-25wt%.

4. The PVC / SAN alloy material according to claim 1, characterized in that: The heat stabilizer is selected from at least one of an organic tin stabilizer and a calcium zinc stabilizer; an organic tin stabilizer is preferred.

5. A PVC / SAN alloy material according to claim 4, characterized in that: The organotin stabilizer is selected from methyltin mercaptan.

6. The PVC / SAN alloy material according to claim 1, characterized in that: The invention also includes the following components by weight: 3-8 parts of toughening agent and 1-3 parts of lubricant.

7. A PVC / SAN alloy material according to claim 6, characterized in that: The toughening agent is selected from any one or more of MBS toughening agents, CPE toughening agents or ACR toughening agents, preferably MBS toughening agents.

8. The PVC / SAN alloy material according to claim 6, characterized in that: The lubricant is selected from any one or more of polyethylene wax, ester lubricant, stearic acid lubricant, amide lubricant or EBS lubricant.

9. The method for preparing the PVC / SAN alloy material according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: weighing PVC resin, a heat stabilizer and a lubricant, adding them into a high-speed mixer, and heating and mixing them to 90-110° C.; adding SAN resin and a toughening agent, mixing for 1-5 minutes, discharging the mixed powder in the high-speed mixer into a low-speed mixer, cooling the mixed powder to 80° C., feeding the mixed powder into an extruder screw for granulation, and obtaining a PVC / SAN alloy material.

10. The use of the PVC / SAN alloy material according to any one of claims 1 to 8, characterized in that: Used to manufacture transparent parts in the fields of building materials, sanitary ware and household appliances.