Transparent hard polyvinyl chloride gasket and preparation method thereof

Abstract

The invention provides a transparent hard polyvinyl chloride gasket and a preparation method thereof. The transparent hard polyvinyl chloride gasket is prepared from the following raw materials in parts by weight: 30 to 60 parts of polyvinyl chloride resin, 30 to 55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene quadripolymer, 1 to 25 parts of chlorinated polyvinyl chloride, 1 to 10 parts of plasticizer and 0 to 10 parts of other auxiliaries. The plasticizer comprises a butyl phthalate compound and an octyl phthalate compound. The transparent hard polyvinyl chloride gasket has better heat resistance and light transmission performance, and can meet the use requirements of high-transparency and high-heat-resistance occasions.

Description

Technical Field

[0001] The invention relates to the technical field of polyvinyl chloride synthesis, in particular to a transparent hard polyvinyl chloride gasket and a preparation method thereof. Background Art

[0002] PVC is an amorphous thermoplastic polymer obtained by polymerizing the monomer vinyl chloride. It has excellent comprehensive mechanical properties, and has certain flame retardancy, wear resistance, and chemical corrosion resistance. Therefore, PVC has become a cost-effective general-purpose plastic with a wide range of applications, mainly in light industry, building materials, agriculture, daily life, packaging, electricity, public utilities and other fields.

[0003] Plastic gaskets are gradually replacing metal gaskets in the electrical industry because of their acid and alkali resistance and insulation. Among them, rigid polyvinyl chloride gaskets are favored by consumers because of their high impact resistance. However, rigid transparent polyvinyl chloride gaskets have a low heat deformation temperature (≤70°C), are easy to soften at high temperatures, become brittle at low temperatures, and are prone to deformation, especially in environments where they are subjected to long-term stress or large temperature changes. In addition, their light transmittance belongs to that of general transparent materials (light transmittance ≤83%, haze ≥10%), which limits the application of transparent polyvinyl chloride gaskets in some occasions with high transparency and high heat resistance requirements. Summary of the invention

[0004] Based on the above problems, the purpose of the present invention is to provide a transparent rigid polyvinyl chloride gasket and a preparation method thereof. The transparent rigid polyvinyl chloride gasket has better heat resistance and light transmittance, and can meet the requirements of high transparency and high heat resistance occasions.

[0005] To achieve the above-mentioned purpose, the present invention provides a transparent rigid polyvinyl chloride gasket on the one hand. The raw materials for preparing the gasket include, by weight, 30 to 60 parts of polyvinyl chloride resin, 30 to 55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 1 to 25 parts of chlorinated polyvinyl chloride, 1 to 10 parts of plasticizer and 0 to 10 parts of other additives, wherein the plasticizer includes butyl phthalate compounds and octyl phthalate compounds.

[0006] The transparent rigid polyvinyl chloride gasket of the present invention has at least the following technical effects.

[0007] (1) The raw materials include 30 to 60 parts of polyvinyl chloride resin (PVC), 30 to 55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer and 1 to 25 parts of chlorinated polyvinyl chloride (CPVC). On the basis of polyvinyl chloride resin, high content of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer (MABS) is added. MABS can not only well improve the transparency of polyvinyl chloride resin and chlorinated polyvinyl chloride, but also can well improve the heat resistance and processing performance of polyvinyl chloride resin and chlorinated polyvinyl chloride. On the basis of polyvinyl chloride resin, chlorinated polyvinyl chloride is added. The chlorinated polyvinyl chloride modified by chlorination can significantly improve the heat resistance of polyvinyl chloride resin, and its Vicat softening temperature and maximum use temperature can be significantly improved. Therefore, the rigid polyvinyl chloride gasket of the present invention combines the advantages of PVC, CPVC and MABS, and can not only improve the transparency of the rigid polyvinyl chloride gasket, but also improve the heat resistance and processing performance of the rigid polyvinyl chloride gasket.

[0008] (2) The raw materials for preparing the rigid polyvinyl chloride gasket of the present invention are combined with 30 to 55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer on the basis of 30 to 60 parts of polyvinyl chloride resin. The compatibility of the two is poor. If the compatibility problem cannot be overcome, the obtained rigid polyvinyl chloride gasket is difficult to play the advantages of PVC and MABS. On this basis, the present invention selects butyl phthalate compounds and octyl phthalate compounds as plasticizers. Butyl phthalate compounds and octyl phthalate compounds can not only play their plasticizing properties, but also butyl phthalate compounds have a strong dissolving power on polyvinyl chloride resin and tetrapolymer, and the hydrophobic effect and surface lubricity produced by the long chain structure of octyl phthalate compounds can play a bridging role and graft the incompatible PVC and MABS. Therefore, the present invention can improve the problem of poor compatibility between high-content polyvinyl chloride resin and high-content methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer by using butyl phthalate compounds and octyl phthalate compounds.

[0009] Preferably, the butyl phthalate compound includes at least one of dibutyl phthalate, tolyl butyl phthalate and monobutyl phthalate.

[0010] Preferably, the octyl phthalate compound includes at least one of di-n-octyl phthalate, di-isooctyl phthalate and di-sec-octyl phthalate.

[0011] Preferably, the other additives include at least one of a heat stabilizer, a toughening agent, a lubricant and a processing aid.

[0012] Preferably, the heat stabilizer includes methyltin mercaptan heat stabilizer and / or calcium zinc heat stabilizer.

[0013] Preferably, the toughening agent includes methyl methacrylate-butadiene-styrene ternary block copolymer and / or an acrylate toughening agent.

[0014] Preferably, the lubricant includes at least one of vinyl bisstearamide, pentaerythritol stearate, high-density oxidized polyethylene wax, acrylic acid, long-chain fatty acid ester, fatty acid polyester and oleic acid amide.

[0015] Preferably, the processing aid includes ACR acrylic resin.

[0016] The second aspect of the present invention provides a method for preparing a transparent rigid polyvinyl chloride gasket, comprising the steps of: mixing the polyvinyl chloride resin, the methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, the chlorinated polyvinyl chloride, the plasticizer and the other additives at a high speed to obtain a mixture, granulating the obtained mixture using a twin-screw granulator, and then putting it into a twin-roll rubber mixer for plasticizing and molding.

[0017] Furthermore, the twin-screw granulator is divided into eight zones from feeding to discharging, and the temperature intervals are 110-130°C, 120-150°C, 130-160°C, 130-160°C, 130-160°C, 130-160°C, 130-160°C, 130-160°C, and 130-160°C respectively.

[0018] In this preparation method, under the action of plasticizers and other additives, polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer and chlorinated polyvinyl chloride are mixed, granulated, plasticized and molded to obtain a gasket with the advantages of three materials: PVC, CPVC and MABS. This gasket has better heat resistance and light transmittance. DETAILED DESCRIPTION

[0019] The transparent rigid polyvinyl chloride gasket of the present invention can be used on electrical equipment. Of course, due to its good light transmittance and heat resistance, it can also be used as other light-transmitting and heat-resistant gaskets.

[0020] Among them, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include, by weight, 30 to 60 parts of polyvinyl chloride resin, 30 to 55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 1 to 25 parts of chlorinated polyvinyl chloride, 1 to 10 parts of plasticizer and 0 to 10 parts of other additives.

[0021] In actual operation, the weight parts of polyvinyl chloride resin can be but not limited to 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 43 parts, 45 parts, 47 parts, 49 parts, 50 parts, 53 parts, 55 parts, 57 parts, 60 parts. The weight parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer can be but not limited to 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 43 parts, 45 parts, 47 parts, 49 parts, 50 parts, 53 parts, 55 parts. Of course, the weight parts of polyvinyl chloride resin and methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer can be the same or different. The weight parts of chlorinated polyvinyl chloride can be but not limited to 1 part, 3 parts, 5 parts, 7 parts, 10 parts, 13 parts, 15 parts, 18 parts, 20 parts, 23 parts, 25 parts.

[0022] The weight proportion of the plasticizer can be, but is not limited to, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, and 10 parts. The butyl phthalate compounds include at least one of dibutyl phthalate, tolyl butyl phthalate, and monobutyl phthalate. The octyl phthalate compounds include at least one of di-n-octyl phthalate, di-isooctyl phthalate, and di-sec-octyl phthalate.

[0023] The weight proportions of other additives may be, but are not limited to, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. Other additives include at least one of a heat stabilizer, a toughening agent, a lubricant, and a processing aid. The heat stabilizer includes a methyl tin mercaptan heat stabilizer and / or a calcium zinc heat stabilizer. The toughening agent includes a methyl methacrylate-butadiene-styrene ternary block copolymer and / or an acrylic toughening agent. The lubricant includes at least one of vinyl bis stearamide, pentaerythritol stearate, high-density oxidized polyethylene wax, acrylic acid, long-chain fatty acid esters, fatty acid polyesters, and oleamide. The processing aid includes ACR acrylic resin.

[0024] In addition, the preparation method of the transparent rigid polyvinyl chloride gasket may include the steps of: mixing polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, chlorinated polyvinyl chloride, plasticizer and other additives at high speed to obtain a mixture, granulating the obtained mixture using a twin-screw granulator, and then putting it into a twin-roll rubber mixer for plasticizing and molding.

[0025] Among them, the working temperature in the twin-screw granulator is 110-180°C, and the head temperature is 150-170°C. The twin-screw granulator is divided into eight zones from feeding to discharging, and the temperature ranges are 110-130°C, 120-150°C, 130-160°C, 130-160°C, 130-160°C, 130-160°C, 130-160°C, 130-160°C, 130-160°C. The plasticizing conditions can be: plasticizing at 170-190°C for 5-30 minutes, and the molding temperature can be 180-210°C.

[0026] 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.

[0027] Example 1

[0028] This embodiment is a transparent rigid polyvinyl chloride gasket. In parts by weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 50 parts of polyvinyl chloride resin, 30 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 15 parts of chlorinated polyvinyl chloride, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of methyl tin mercaptan heat stabilizer, 2 parts of methyl methacrylate-butadiene-styrene ternary block copolymer, 2 parts of pentaerythritol stearate and 2 parts of ACR acrylic resin.

[0029] The preparation method of the transparent rigid polyvinyl chloride gasket of the present embodiment can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, chlorinated polyvinyl chloride, dibutyl phthalate, di-n-octyl phthalate, methyl tin mercaptan heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0030] Example 2

[0031] This embodiment is a transparent rigid polyvinyl chloride gasket. In parts by weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 50 parts of polyvinyl chloride resin, 40 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 15 parts of chlorinated polyvinyl chloride, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of methyl tin mercaptan heat stabilizer, 2 parts of methyl methacrylate-butadiene-styrene ternary block copolymer, 2 parts of pentaerythritol stearate and 2 parts of ACR acrylic resin.

[0032] The preparation method of the transparent rigid polyvinyl chloride gasket of the present embodiment can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, chlorinated polyvinyl chloride, dibutyl phthalate, di-n-octyl phthalate, methyl tin mercaptan heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0033] Example 3

[0034] This embodiment is a transparent rigid polyvinyl chloride gasket. In parts by weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 50 parts of polyvinyl chloride resin, 55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 25 parts of chlorinated polyvinyl chloride, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of methyl tin mercaptan heat stabilizer, 2 parts of methyl methacrylate-butadiene-styrene ternary block copolymer, 2 parts of pentaerythritol stearate and 2 parts of ACR acrylic resin.

[0035] The preparation method of the transparent rigid polyvinyl chloride gasket of the present embodiment can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, chlorinated polyvinyl chloride, dibutyl phthalate, di-n-octyl phthalate, methyl tin mercaptan heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0036] Example 4

[0037] This embodiment is a transparent rigid polyvinyl chloride gasket. In parts by weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 60 parts of polyvinyl chloride resin, 45 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 20 parts of chlorinated polyvinyl chloride, 3 parts of dibutyl phthalate, 5 parts of di-n-octyl phthalate, 2 parts of methyl tin mercaptan heat stabilizer, 4 parts of methyl methacrylate-butadiene-styrene ternary block copolymer, 1 part of pentaerythritol stearate and 2 parts of ACR acrylic resin.

[0038] The preparation method of the transparent rigid polyvinyl chloride gasket of the present embodiment can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, chlorinated polyvinyl chloride, dibutyl phthalate, di-n-octyl phthalate, methyl tin mercaptan heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0039] Example 5

[0040] This embodiment is a transparent rigid polyvinyl chloride gasket. In parts by weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 15 parts of chlorinated polyvinyl chloride, 3 parts of tolyl butyl phthalate, 3 parts of diisooctyl phthalate, 2 parts of calcium zinc heat stabilizer, 3 parts of pentaerythritol stearate and 3 parts of ACR acrylic resin.

[0041] The preparation method of the transparent rigid polyvinyl chloride gasket of the present embodiment can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, chlorinated polyvinyl chloride, tolyl butyl phthalate, diisooctyl phthalate, calcium zinc heat stabilizer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0042] Example 6

[0043] This embodiment is a transparent rigid polyvinyl chloride gasket. In terms of weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 15 parts of chlorinated polyvinyl chloride, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of acrylic toughener, 1 part of vinyl bisstearamide and 3 parts of ACR acrylic resin.

[0044] The preparation method of the transparent rigid polyvinyl chloride gasket of the present embodiment can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, chlorinated polyvinyl chloride, dibutyl phthalate, di-n-octyl phthalate, acrylic ester toughening agent, vinyl bisstearamide and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0045] Comparative Example 1

[0046] This comparative example is a transparent rigid polyvinyl chloride gasket. In terms of weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 100 parts of polyvinyl chloride resin, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of methyl tin mercaptan heat stabilizer, 7 parts of methyl methacrylate-butadiene-styrene ternary block copolymer, 3 parts of pentaerythritol stearate and 3 parts of ACR acrylic resin.

[0047] The preparation method of the transparent rigid polyvinyl chloride gasket of the comparative example can be as follows: polyvinyl chloride resin, dibutyl phthalate, di-n-octyl phthalate, methyl tin mercaptan heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0048] Comparative Example 2

[0049] This comparative example is a transparent rigid polyvinyl chloride gasket. In parts by weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of methyl tin mercaptan heat stabilizer, 7 parts of methyl methacrylate-butadiene-styrene ternary block copolymer, 3 parts of pentaerythritol stearate and 3 parts of ACR acrylic resin.

[0050] The preparation method of the transparent rigid polyvinyl chloride gasket of the comparative example can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, dibutyl phthalate, di-n-octyl phthalate, methyl tin mercaptan heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0051] Comparative Example 3

[0052] This comparative example is a transparent rigid polyvinyl chloride gasket. In terms of weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 100 parts of polyvinyl chloride resin, 15 parts of chlorinated polyvinyl chloride, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of methyl tin mercaptan heat stabilizer, 7 parts of methyl methacrylate-butadiene-styrene ternary block copolymer, 3 parts of pentaerythritol stearate and 3 parts of ACR acrylic resin.

[0053] The preparation method of the transparent rigid polyvinyl chloride gasket of the comparative example can be as follows: polyvinyl chloride resin, chlorinated polyvinyl chloride, dibutyl phthalate, di-n-octyl phthalate, methyl tin mercaptan heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0054] Comparative Example 4

[0055] This comparative example is a transparent rigid polyvinyl chloride gasket. In terms of weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 15 parts of chlorinated polyvinyl chloride, 3 parts of methyl tin mercaptan heat stabilizer, 7 parts of methyl methacrylate-butadiene-styrene ternary block copolymer, 3 parts of pentaerythritol stearate and 3 parts of ACR acrylic resin.

[0056] The preparation method of the transparent rigid polyvinyl chloride gasket of the comparative example can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, chlorinated polyvinyl chloride, methyl tin mercaptan heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0057] Comparative Example 5

[0058] This embodiment is a transparent rigid polyvinyl chloride gasket. In parts by weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 15 parts of chlorinated polyvinyl chloride, 4 parts of di-n-octyl phthalate, 3 parts of methyl tin mercaptan heat stabilizer, 7 parts of methyl methacrylate-butadiene-styrene ternary block copolymer, 3 parts of pentaerythritol stearate and 3 parts of ACR acrylic resin.

[0059] The preparation method of the transparent rigid polyvinyl chloride gasket of the comparative example can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, chlorinated polyvinyl chloride, di-n-octyl phthalate, methyl tin mercaptan heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0060] Comparative Example 6

[0061] This comparative example is a transparent rigid polyvinyl chloride gasket. In parts by weight, the raw materials for preparing the transparent rigid polyvinyl chloride gasket include 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 15 parts of chlorinated polyvinyl chloride, 4 parts of dibutyl phthalate, 3 parts of methyl tin mercaptan heat stabilizer, 7 parts of methyl methacrylate-butadiene-styrene terblock copolymer, 3 parts of pentaerythritol stearate and 3 parts of ACR acrylic resin.

[0062] The preparation method of the transparent rigid polyvinyl chloride gasket of the comparative example can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, chlorinated polyvinyl chloride, dibutyl phthalate, methyl tin mercaptan heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are mixed at high speed to obtain a mixture, the mixture is granulated by a twin-screw granulator, and then put into a twin-roll rubber mixer for plasticizing and molding.

[0063] The transparent rigid polyvinyl chloride gaskets of Examples 1 to 6 and Comparative Examples 1 to 6 were subjected to performance tests, and the results are shown in Table 1. The test methods are as follows.

[0064] The specific gravity of the transparent rigid polyvinyl chloride gasket was tested using an electronic specific gravity meter. The tensile strength and flexural strength were tested according to GB / T 1040.1-2006 "Determination of tensile properties of plastics Part 1: General" and GB / T 9341-2008 "Determination of flexural properties of plastics". The transmittance and haze of the transparent rigid polyvinyl chloride gasket were tested using a transmittance / haze tester.

[0065] Table 1 Test results of Examples 1 to 6 and Comparative Examples 1 to 6

[0066]

[0067]

[0068] From the results in Table 1, it can be seen that the hard polyvinyl chloride gasket prepared by using high-content polyvinyl chloride resin with high-content methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer and chlorinated polyvinyl chloride resin has a higher Vicat softening point and light transmittance, and lower haze, indicating that the heat resistance and light transmittance are better. Choosing butyl phthalate compounds and octyl phthalate compounds as plasticizers can solve the problem of poor compatibility between high-content polyvinyl chloride resin and high-content methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, thereby giving full play to their advantages.

[0069] 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 transparent rigid polyvinyl chloride gasket, characterized in that: The raw materials include 30 to 60 parts of polyvinyl chloride resin, 30 to 55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 1 to 25 parts of chlorinated polyvinyl chloride, 1 to 10 parts of plasticizer and 0 to 10 parts of other additives in parts by weight, wherein the plasticizer includes butyl phthalate compounds and octyl phthalate compounds.

2. The transparent rigid polyvinyl chloride gasket according to claim 1, characterized in that: The butyl phthalate compound includes at least one of dibutyl phthalate, tolyl butyl phthalate and monobutyl phthalate.

3. The transparent rigid polyvinyl chloride gasket according to claim 1, characterized in that: The octyl phthalate compound includes at least one of di-n-octyl phthalate, di-isooctyl phthalate and di-sec-octyl phthalate.

4. The transparent rigid polyvinyl chloride gasket according to claim 1, characterized in that: The other additives include at least one of a heat stabilizer, a toughening agent, a lubricant and a processing aid.

5. The transparent rigid polyvinyl chloride gasket according to claim 4, characterized in that: The heat stabilizer includes methyltin mercaptan heat stabilizer and / or calcium zinc heat stabilizer.

6. The transparent rigid polyvinyl chloride gasket according to claim 4, characterized in that: The toughening agent includes methyl methacrylate-butadiene-styrene ternary block copolymer and / or an acrylic toughening agent.

7. The transparent rigid polyvinyl chloride gasket according to claim 4, characterized in that: The lubricant includes at least one of ethylene bisstearamide, pentaerythritol stearate, high-density oxidized polyethylene wax, acrylic acid, long-chain fatty acid ester, fatty acid polyester and oleic acid amide.

8. The transparent rigid polyvinyl chloride gasket according to claim 4, characterized in that: The processing aid includes ACR acrylic resin.

9. The method for preparing a transparent rigid polyvinyl chloride gasket according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: mixing the polyvinyl chloride resin, the methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, the chlorinated polyvinyl chloride, the plasticizer and the other additives at a high speed to obtain a mixture; granulating the obtained mixture by a twin-screw granulator; and then putting the mixture into a twin-roll rubber mixer for plasticizing and molding.

10. The method for preparing a transparent rigid polyvinyl chloride gasket according to claim 9, characterized in that: The twin-screw granulator is divided into eight zones from feeding to discharging, and the temperature intervals are 110-130°C, 120-150°C, 130-160°C, 130-160°C, 130-160°C, 130-160°C, 130-160°C, 130-160°C, and 130-160°C respectively.

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