Outdoor hard polyvinyl chloride material and preparation method and product thereof

Abstract

The invention provides an outdoor hard polyvinyl chloride material and a preparation method and a product thereof. The outdoor hard polyvinyl chloride material is prepared from the following raw materials in parts by weight: 80 to 100 parts of polyvinyl chloride resin, 15 to 50 parts of chlorinated polyvinyl chloride resin, 50 to 100 parts of acrylonitrile-styrene-acrylate terpolymer, 3 to 15 parts of impact modifier, 0.1 to 5.0 parts of processing aid, 0.1 to 5.0 parts of lubricant and 0 to 10 parts of other aids. The impact modifier comprises a methyl methacrylate-butadiene-styrene terpolymer and chlorinated polyethylene, and the processing aid comprises ACR acrylic resin. The lubricant includes a first lubricant and a second lubricant. The melting point of the first lubricant is 20-70 DEG C, and the melting point of the second lubricant is 100-115 DEG C. The outdoor rigid polyvinyl chloride material has the advantages of excellent compatibility of the components, high impact strength, high weather resistance and low specific gravity, and meets the use requirements of base station antenna housing materials.

Description

Technical Field

[0001] The invention relates to the technical field of polyvinyl chloride synthesis, in particular to a rigid polyvinyl chloride material for outdoor use, a preparation method thereof, and products thereof. Background Art

[0002] As mobile communication networks evolve towards 5G, high quality, lightweight and integrated 5G base station antennas are necessary. The main structure of a 5G base station antenna is mainly composed of an outer cover, a reflector, a feed network and a vibrator. Although internal electronic components play a major role in 5G base stations in mobile communications, the external antenna cover also plays a vital role in ensuring signal transmission and protecting the normal operation of electronic components. Since the base station antenna cover is placed outdoors for a long time, it is often attacked by harsh external environments (such as storms, ice and snow, dust and solar radiation) during use. Therefore, the base station antenna cover material needs to have high weather resistance and mechanical properties, such as impact strength.

[0003] The current market mainly has base station antenna covers made of the following materials: 1. Polyimide composite materials, although they have excellent performance, are too expensive to be used on a large scale. 2. Continuous glass fiber reinforced polypropylene composite materials (CGF-PP), although they can meet the high-frequency and low-loss requirements of 5G communications, have a high specific gravity, are not convenient for high-altitude installation, and have poor impact resistance.

[0004] Rigid polyvinyl chloride (RPVC) materials are widely used in various industries due to their low cost, natural flame retardancy, and easy modification, especially in the construction, white appliances and other processing industries. However, polyvinyl chloride resin is difficult to process, brittle, and has poor toughness. By adjusting the RPVC formula system and matching it with suitable modification additives, the weather resistance, mechanical properties, mechanical strength and processing properties of RPVC can be improved, and its light specific gravity enables it to meet the requirements of base station antenna cover shells. However, there is a big problem with the current rigid polyvinyl chloride materials, that is, the compatibility of various modification additives and polyvinyl chloride resins is poor. If the compatibility is poor and uniform dispersion cannot be achieved, the impact strength of rigid polyvinyl chloride will be greatly affected, making it difficult to meet the use requirements of base station antenna cover materials. Summary of the invention

[0005] Based on the above problems, the purpose of the present invention is to provide an outdoor rigid polyvinyl chloride material and its preparation method, and its products. The components in this outdoor rigid polyvinyl chloride material have good compatibility, high impact strength, weather resistance, low specific gravity, and meet the use requirements of base station antenna cover materials.

[0006] To achieve the above-mentioned purpose, the present invention provides a kind of outdoor rigid polyvinyl chloride material on the one hand, wherein the raw materials for preparation include 80-100 parts of polyvinyl chloride resin, 15-50 parts of chlorinated polyvinyl chloride resin, 50-100 parts of acrylonitrile-styrene-acrylate terpolymer, 3-15 parts of impact modifier, 0.1-5.0 parts of processing aid, 0.1-5.0 parts of lubricant and 0-10 parts of other additives, the impact modifier includes methyl methacrylate-butadiene-styrene terpolymer and chlorinated polyethylene, the processing aid includes ACR acrylic resin, the lubricant includes a first lubricant and a second lubricant, the melting point of the first lubricant is 20-70°C, and the melting point of the second lubricant is 100-115°C.

[0007] The outdoor rigid polyvinyl chloride material of the present invention has at least the following technical effects.

[0008] (1) Adding styrene-acrylonitrile-acrylate terpolymer to polyvinyl chloride resin and chlorinated polyvinyl chloride resin can obtain excellent weather resistance.

[0009] (2) Methyl methacrylate-butadiene-styrene terpolymer and chlorinated polyethylene are selected as impact modifiers. Among them, methyl methacrylate-butadiene-styrene terpolymer has a relatively large content of unsaturated vinyl components and is compounded with chlorinated polyethylene. The compatibilizer with polyvinyl chloride resin and chlorinated polyvinyl chloride resin is moderate, which will neither cause excessive compatibility and complete molecular mixing to change the effect of the impact modifier, nor cause too low compatibility to achieve uniform dispersion, causing the impact modifier to lose its adhesion to polyvinyl chloride and fail to absorb vibration. In addition, the low glass transition temperature of chlorinated polyethylene can increase the impact resistance of the material at low temperatures, thereby expanding the applicable range of impact resistance.

[0010] (3) As a processing aid, ACR acrylic resin can broaden the processing window of polyvinyl chloride and improve the processing performance of polyvinyl chloride.

[0011] (4) Two types of lubricants with different melting points are used. The first lubricant with a low melting point can melt and lubricate in the early stage of molding, and the second lubricant with a high melting point can melt and lubricate in the middle and late stages of molding. By playing a lubricating role throughout the entire molding process, the melt viscosity during molding can be reduced, fluidity can be increased, local overheating that causes decomposition of polyvinyl chloride can be reduced, and the plasticization rate can be controlled.

[0012] Preferably, the other auxiliary agents include at least one of a heat stabilizer and a weathering modifier.

[0013] Preferably, the heat stabilizer includes an organic tin heat stabilizer and / or a calcium zinc heat stabilizer.

[0014] Preferably, the weather resistance modifier includes at least one of an antioxidant, an ultraviolet light absorber and a hindered amine light and heat stabilizer.

[0015] Preferably, the weight ratio of the first lubricant to the second lubricant is 10-30:70-90.

[0016] Preferably, the first lubricant includes at least one of liquid paraffin, natural paraffin, n-butyl stearate and stearic acid.

[0017] Preferably, the second lubricant includes PE wax and / or OPE wax.

[0018] The second aspect of the present invention provides a method for preparing a rigid polyvinyl chloride material for outdoor use, comprising the steps of:

[0019] (1) placing the polyvinyl chloride resin, the chlorinated polyvinyl chloride resin and the acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0020] (2) adding the first lubricant and the other additives and mixing evenly to obtain a secondary mixture;

[0021] (3) After the temperature is raised to the first temperature, the impact modifier, the processing aid and the second lubricant are added, and then the temperature is raised to the second temperature, stirred for a certain period of time, extruded, pelletized and cooled.

[0022] Further, the first temperature is between the melting points of the first lubricant and the second lubricant, and the second temperature is higher than the melting point of the second lubricant.

[0023] In this preparation method, after the polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer are mixed, the first lubricant and other additives are added first and then the temperature is raised to the first temperature. During the heating process, the first lubricant first melts to form a lubricating film and plays a lubricating role, which can avoid the lubrication effect affected by a large amount of volatilization when the temperature is too high. The second lubricant is added before the second heating. Similarly, the second lubricant first melts during the heating process to form a lubricating film or penetrate into each layer of polyvinyl chloride particles to play a lubricating role. The volatility of the first lubricant and the second lubricant is greatly reduced, which can avoid the volatile matter blocking the mold system during the subsequent cooling process and affecting the use.

[0024] The third aspect of the present invention provides an outdoor rigid polyvinyl chloride product, which uses the aforementioned outdoor rigid polyvinyl chloride material, puts it into a double-roll rubber mixer, plasticates it at 170-180°C for 5-20 minutes, and then molds it at 180-200°C. DETAILED DESCRIPTION

[0025] The outdoor rigid polyvinyl chloride product of the present invention can be used for base station antenna cover shells. Of course, due to its good weather resistance and impact strength, it can also be used as other outdoor protective materials. The outdoor rigid polyvinyl chloride product can be prepared by putting the rigid polyvinyl chloride material into a double-roll rubber mixer, plasticating at 170-180°C for 5-20 minutes, and then molding at 180-200°C.

[0026] Among them, the raw materials for preparing outdoor rigid polyvinyl chloride materials include, by weight, 80 to 100 parts of polyvinyl chloride resin, 15 to 50 parts of chlorinated polyvinyl chloride resin, 50 to 100 parts of acrylonitrile-styrene-acrylate terpolymer, 3 to 15 parts of impact modifier, 0.1 to 5.0 parts of processing aid, 0.1 to 5.0 parts of lubricant and 0 to 10 parts of other additives.

[0027] In actual operation, the weight proportion of polyvinyl chloride resin can be, but not limited to, 80, 82, 84, 86, 88, 90, 93, 95, 97, 99, 100. The weight proportion of chlorinated polyvinyl chloride resin can be, but not limited to, 15, 20, 25, 30, 35, 40, 45, 50. The weight proportion of acrylonitrile-styrene-acrylate terpolymer can be, but not limited to, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100.

[0028] The weight proportion of the impact modifier can be, but is not limited to, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15. The impact modifier includes methyl methacrylate-butadiene-styrene terpolymer and chlorinated polyethylene. The weight ratio of methyl methacrylate-butadiene-styrene terpolymer to chlorinated polyethylene can be 1 to 7:3 to 9.

[0029] The weight percentage of the processing aid can be, but is not limited to, 0.1 part, 0.5 part, 1.0 part, 1.5 part, 2.0 part, 2.5 part, 3.0 part, 3.5 part, 4.0 part, 4.5 part, 5.0 part. The processing aid includes ACR acrylic resin.

[0030] The weight proportion of the lubricant may be, but is not limited to, 0.1, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, and 5.0. The lubricant includes a first lubricant and a second lubricant, the melting point of the first lubricant is 20 to 70° C., and the melting point of the second lubricant is 100 to 115° C. The weight ratio of the first lubricant to the second lubricant is 10 to 30:70 to 90. The first lubricant includes at least one of liquid paraffin, natural paraffin, n-butyl stearate, and stearic acid. The second lubricant includes PE wax and / or OPE wax.

[0031] The weight percentage of other additives can be, but is not limited to, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10. Other additives include at least one of a heat stabilizer and a weathering modifier. The heat stabilizer includes an organic tin heat stabilizer and / or a calcium zinc heat stabilizer. The weathering modifier includes at least one of an antioxidant, an ultraviolet light absorber, and a hindered amine light heat stabilizer.

[0032] In addition, the preparation method of the outdoor rigid polyvinyl chloride material may include the following steps.

[0033] (1) Polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer are placed in a high-speed kneader and stirred to obtain a main mixture.

[0034] (2) Add the first lubricant and other additives and mix them evenly to obtain a secondary mixture.

[0035] (3) After the temperature is raised to the first temperature, an impact modifier, a processing aid, and the second lubricant are added, the temperature is raised to the second temperature again, and stirred for a certain period of time, extruded, pelletized, and cooled.

[0036] Further, the first temperature is between the melting points of the first lubricant and the second lubricant, and the second temperature is higher than the melting point of the second lubricant. The first temperature may be 40-75°C, and the second temperature may be 115-125°C. As an example, the first temperature may be, but not limited to, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, and the second temperature may be, but not limited to, 115°C, 116°C, 117°C, 118°C, 119°C, 120°C, 121°C, 122°C, 123°C, 124°C, 125°C. The stirring time may be 0.5-5.0h, and as an example, the time may be, but not limited to, 0.5h, 1.0h, 1.5h, 2.0h, 2.5h, 3.0h, 3.5h, 4.0h, 4.5h, 5.0h.

[0037] In order to better illustrate the purpose, technical scheme and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

[0038] Example 1

[0039] This embodiment is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 15 parts of chlorinated polyvinyl chloride resin, 50 parts of acrylonitrile-styrene-acrylate terpolymer, 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 3 parts of chlorinated polyethylene, 3 parts of ACR acrylic resin, 0.6 parts of liquid paraffin, 2.4 parts of PE wax, 2 parts of organic tin heat stabilizer and 1 part of antioxidant 1076.

[0040] The preparation method of the outdoor rigid polyvinyl chloride material of this embodiment can be:

[0041] (1) placing polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0042] (2) adding liquid paraffin, organotin heat stabilizer and antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0043] (3) After the temperature is raised to 65° C., methyl methacrylate-butadiene-styrene terpolymer, chlorinated polyethylene, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120° C. and stirred for 2 h. The mixture is extruded, pelletized and cooled at room temperature.

[0044] Example 2

[0045] This embodiment is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 15 parts of chlorinated polyvinyl chloride resin, 100 parts of acrylonitrile-styrene-acrylate terpolymer, 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 3 parts of chlorinated polyethylene, 3 parts of ACR acrylic resin, 0.6 parts of liquid paraffin, 2.4 parts of PE wax, 2 parts of organic tin heat stabilizer and 1 part of antioxidant 1076.

[0046] The preparation method of the outdoor rigid polyvinyl chloride material of this embodiment can be:

[0047] (1) placing polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0048] (2) adding liquid paraffin, organotin heat stabilizer and antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0049] (3) After the temperature is raised to 65° C., methyl methacrylate-butadiene-styrene terpolymer, chlorinated polyethylene, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120° C. and stirred for 2 h. The mixture is extruded, pelletized and cooled at room temperature.

[0050] Example 3

[0051] This embodiment is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 25 parts of chlorinated polyvinyl chloride resin, 100 parts of acrylonitrile-styrene-acrylate terpolymer, 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 3 parts of chlorinated polyethylene, 3 parts of ACR acrylic resin, 0.6 parts of liquid paraffin, 2.4 parts of PE wax, 2 parts of organic tin heat stabilizer and 1 part of antioxidant 1076.

[0052] The preparation method of the outdoor rigid polyvinyl chloride material of this embodiment can be:

[0053] (1) placing polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0054] (2) adding liquid paraffin, organotin heat stabilizer and antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0055] (3) After the temperature is raised to 65° C., methyl methacrylate-butadiene-styrene terpolymer, chlorinated polyethylene, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120° C. and stirred for 2 h. The mixture is extruded, pelletized and cooled at room temperature.

[0056] Example 4

[0057] This embodiment is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 45 parts of chlorinated polyvinyl chloride resin, 75 parts of acrylonitrile-styrene-acrylate terpolymer, 4 parts of methyl methacrylate-butadiene-styrene terpolymer, 6 parts of chlorinated polyethylene, 1 part of ACR acrylic resin, 1.0 part of liquid paraffin, 3.0 parts of PE wax, 1.5 parts of organic tin heat stabilizer and 2.5 parts of antioxidant 1076.

[0058] The preparation method of the outdoor rigid polyvinyl chloride material of this embodiment can be:

[0059] (1) placing polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0060] (2) adding liquid paraffin, organotin heat stabilizer and antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0061] (3) After the temperature is raised to 65° C., methyl methacrylate-butadiene-styrene terpolymer, chlorinated polyethylene, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120° C. and stirred for 2 h. The mixture is extruded, pelletized and cooled at room temperature.

[0062] Example 5

[0063] This embodiment is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 15 parts of chlorinated polyvinyl chloride resin, 50 parts of acrylonitrile-styrene-acrylate terpolymer, 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 3 parts of chlorinated polyethylene, 3 parts of ACR acrylic resin, 0.6 parts of liquid paraffin, 2.4 parts of PE wax, 1 part of calcium zinc heat stabilizer and 0.5 parts of hindered amine light heat stabilizer.

[0064] The preparation method of the outdoor rigid polyvinyl chloride material of this embodiment can be:

[0065] (1) placing polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0066] (2) adding liquid paraffin, calcium zinc heat stabilizer and hindered amine light and heat stabilizer and mixing evenly to obtain a secondary mixture;

[0067] (3) After the temperature is raised to 65° C., methyl methacrylate-butadiene-styrene terpolymer, chlorinated polyethylene, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120° C. and stirred for 2 h. The mixture is extruded, pelletized and cooled at room temperature.

[0068] Example 6

[0069] This embodiment is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 15 parts of chlorinated polyvinyl chloride resin, 50 parts of acrylonitrile-styrene-acrylate terpolymer, 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 3 parts of chlorinated polyethylene, 3 parts of ACR acrylic resin, 1.8 parts of stearic acid, 2.0 parts of PE wax, 2 parts of organic tin heat stabilizer and 1 part of antioxidant 1076.

[0070] The preparation method of the outdoor rigid polyvinyl chloride material of this embodiment can be:

[0071] (1) placing polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0072] (2) adding stearic acid, an organotin heat stabilizer and an antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0073] (3) After the temperature is raised to 75° C., methyl methacrylate-butadiene-styrene terpolymer, chlorinated polyethylene, ACR acrylic resin and PE wax are added, and the temperature is then raised to 123° C. and stirred for 1 h. The mixture is extruded, pelletized and cooled at room temperature.

[0074] Comparative Example 1

[0075] This comparative example is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 3 parts of chlorinated polyethylene, 3 parts of ACR acrylic resin, 0.6 parts of liquid paraffin, 2.4 parts of PE wax, 2 parts of organic tin heat stabilizer and 1 part of antioxidant 1076.

[0076] The preparation method of the outdoor rigid polyvinyl chloride material of this comparative example can be:

[0077] (1) placing polyvinyl chloride resin in a high-speed kneader and stirring to obtain a main mixture;

[0078] (2) adding liquid paraffin, organotin heat stabilizer and antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0079] (3) After the temperature is raised to 65° C., methyl methacrylate-butadiene-styrene terpolymer, chlorinated polyethylene, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120° C. and stirred for 2 h. The mixture is extruded, pelletized and cooled at room temperature.

[0080] Comparative Example 2

[0081] This comparative example is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 50 parts of acrylonitrile-styrene-acrylate terpolymer, 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 3 parts of chlorinated polyethylene, 3 parts of ACR acrylic resin, 0.6 parts of liquid paraffin, 2.4 parts of PE wax, 2 parts of organic tin heat stabilizer and 1 part of antioxidant 1076.

[0082] The preparation method of the outdoor rigid polyvinyl chloride material of this comparative example can be:

[0083] (1) placing polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0084] (2) adding liquid paraffin, organotin heat stabilizer and antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0085] (3) After the temperature is raised to 65° C., methyl methacrylate-butadiene-styrene terpolymer, chlorinated polyethylene, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120° C. and stirred for 2 h. The mixture is extruded, pelletized and cooled at room temperature.

[0086] Comparative Example 3

[0087] This comparative example is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 15 parts of chlorinated polyvinyl chloride resin, 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 3 parts of chlorinated polyethylene, 3 parts of ACR acrylic resin, 0.6 parts of liquid paraffin, 2.4 parts of PE wax, 2 parts of organic tin heat stabilizer and 1 part of antioxidant 1076.

[0088] The preparation method of the outdoor rigid polyvinyl chloride material of this comparative example can be:

[0089] (1) placing polyvinyl chloride resin and chlorinated polyvinyl chloride resin in a high-speed kneader and stirring to obtain a main mixture;

[0090] (2) adding liquid paraffin, organotin heat stabilizer and antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0091] (3) After the temperature is raised to 65° C., methyl methacrylate-butadiene-styrene terpolymer, chlorinated polyethylene, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120° C. and stirred for 2 h. The mixture is extruded, pelletized and cooled at room temperature.

[0092] Comparative Example 4

[0093] This comparative example is an outdoor rigid polyvinyl chloride material. The raw materials for preparing the outdoor rigid polyvinyl chloride material include, by weight, 100 parts of polyvinyl chloride resin, 15 parts of chlorinated polyvinyl chloride resin, 50 parts of acrylonitrile-styrene-acrylate terpolymer, 3 parts of ACR acrylic resin, 0.6 parts of liquid paraffin, 2.4 parts of PE wax, 2 parts of organic tin heat stabilizer and 1 part of antioxidant 1076.

[0094] The preparation method of the outdoor rigid polyvinyl chloride material of this comparative example can be:

[0095] (1) placing polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0096] (2) adding liquid paraffin, organotin heat stabilizer and antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0097] (3) After the temperature is raised to 65°C, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120°C and stirred for 2 h. The mixture is extruded, pelletized, and cooled at room temperature.

[0098] Comparative Example 5

[0099] This comparative example is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 15 parts of chlorinated polyvinyl chloride resin, 50 parts of acrylonitrile-styrene-acrylate terpolymer, 3 parts of chlorinated polyethylene, 3 parts of ACR acrylic resin, 0.6 parts of liquid paraffin, 2.4 parts of PE wax, 2 parts of organic tin heat stabilizer and 1 part of antioxidant 1076.

[0100] The preparation method of the outdoor rigid polyvinyl chloride material of this comparative example can be:

[0101] (1) placing polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0102] (2) adding liquid paraffin, organotin heat stabilizer and antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0103] (3) After the temperature is raised to 65°C, chlorinated polyethylene, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120°C and stirred for 2 h. The mixture is extruded, pelletized and cooled at room temperature.

[0104] Comparative Example 6

[0105] This comparative example is a rigid polyvinyl chloride material for outdoor use. The raw materials for preparing the rigid polyvinyl chloride material for outdoor use include, by weight, 100 parts of polyvinyl chloride resin, 15 parts of chlorinated polyvinyl chloride resin, 50 parts of acrylonitrile-styrene-acrylate terpolymer, 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 3 parts of ACR acrylic resin, 0.6 parts of liquid paraffin, 2.4 parts of PE wax, 2 parts of organic tin heat stabilizer and 1 part of antioxidant 1076.

[0106] The preparation method of the outdoor rigid polyvinyl chloride material of this comparative example can be:

[0107] (1) placing polyvinyl chloride resin, chlorinated polyvinyl chloride resin and acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture;

[0108] (2) adding liquid paraffin, organotin heat stabilizer and antioxidant 1076 and mixing evenly to obtain a secondary mixture;

[0109] (3) After the temperature is raised to 65° C., methyl methacrylate-butadiene-styrene terpolymer, ACR acrylic resin and PE wax are added, and the temperature is then raised to 120° C. and stirred for 2 h. The mixture is extruded, pelletized and cooled at room temperature.

[0110] The outdoor rigid polyvinyl chloride materials of Examples 1 to 6 and Comparative Examples 1 to 6 were put into a double-roll rubber mixer and plasticized at 180°C for 10 minutes, and then molded at 185°C to obtain products. The products were tested for performance. The results are shown in Table 1. The test method is as follows.

[0111] The specific gravity of PVC products was tested using an electronic specific gravity meter. The Vicat softening point was tested using a plastic PVC heat deformation Vicat softening point tester. The tensile strength and bending strength were tested according to GB / T 1040.1-2006 "Determination of tensile properties of plastics Part 1: General" and GB / T9341-2008 "Determination of bending properties of plastics". The color difference of PVC products was tested using a colorimeter and the color difference value △E before and after UV was calculated.

[0112] Table 1 Test results of Examples 1 to 6 and Comparative Examples 1 to 6

[0113]

[0114]

[0115] Among them, the UV light intensity is Jubilee 15w UV lamp, and the time is 24h.

[0116] From the results in Table 1, it can be seen that the outdoor rigid polyvinyl chloride material prepared by using polyvinyl chloride resin, chlorinated polyvinyl chloride resin, acrylonitrile-styrene-acrylate terpolymer as the main raw materials, and selecting methyl methacrylate-butadiene-styrene terpolymer and chlorinated polyethylene as the impact modifier, and using two types of lubricants with different melting points has a lower specific gravity, higher tensile strength and flexural strength. After UV light, it still has high tensile strength and flexural strength and low color difference value, indicating that it has better weather resistance and can meet the use requirements of base station antenna cover materials.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it is not limited to those listed in the embodiments. Those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A rigid polyvinyl chloride material for outdoor use, characterized in that: The raw materials for preparation include 80-100 parts of polyvinyl chloride resin, 15-50 parts of chlorinated polyvinyl chloride resin, 50-100 parts of acrylonitrile-styrene-acrylate terpolymer, 3-15 parts of impact modifier, 0.1-5.0 parts of processing aid, 0.1-5.0 parts of lubricant and 0-10 parts of other additives in parts by weight, the impact modifier includes methyl methacrylate-butadiene-styrene terpolymer and chlorinated polyethylene, the processing aid includes ACR acrylic resin, the lubricant includes a first lubricant and a second lubricant, the melting point of the first lubricant is 20-70°C, and the melting point of the second lubricant is 100-115°C.

2. The outdoor rigid polyvinyl chloride material according to claim 1, characterized in that: The other auxiliary agents include at least one of a heat stabilizer and a weathering modifier.

3. The outdoor rigid polyvinyl chloride material according to claim 2, characterized in that: The heat stabilizer includes an organic tin heat stabilizer and / or a calcium zinc heat stabilizer.

4. The outdoor rigid polyvinyl chloride material according to claim 2, characterized in that: The weathering modifier includes at least one of an antioxidant, an ultraviolet light absorber and a hindered amine light and heat stabilizer.

5. The outdoor rigid polyvinyl chloride material according to claim 1, characterized in that: The weight ratio of the first lubricant to the second lubricant is 10-30:70-90.

6. The outdoor rigid polyvinyl chloride material according to claim 1, characterized in that: The first lubricant includes at least one of liquid paraffin, natural paraffin, n-butyl stearate and stearic acid.

7. The outdoor rigid polyvinyl chloride material according to claim 1, characterized in that: The second lubricant includes PE wax and / or OPE wax.

8. The method for preparing the outdoor rigid polyvinyl chloride material according to any one of claims 1 to 7, characterized in that: Includes steps: (1) placing the polyvinyl chloride resin, the chlorinated polyvinyl chloride resin and the acrylonitrile-styrene-acrylate terpolymer in a high-speed kneader and stirring to obtain a main mixture; (2) adding the first lubricant and the other additives and mixing evenly to obtain a secondary mixture; (3) After the temperature is raised to the first temperature, the impact modifier, the processing aid and the second lubricant are added, and then the temperature is raised to the second temperature, stirred for a certain period of time, extruded, pelletized and cooled.

9. The method for preparing the outdoor rigid polyvinyl chloride material according to claim 8, characterized in that: The first temperature is between melting points of the first lubricant and the second lubricant, and the second temperature is higher than the melting point of the second lubricant.

10. A rigid polyvinyl chloride product for outdoor use, characterized in that: The outdoor rigid polyvinyl chloride material prepared by the preparation method of the outdoor rigid polyvinyl chloride material according to any one of claims 1 to 7 or any one of claims 8 to 9 is put into a double-roll rubber mixer and plasticized at 170 to 180° C. for 5 to 20 minutes, and then molded at 180 to 200° C.

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