Transparent rigid polyvinyl chloride gasket and method of making same

Abstract

The application provides a transparent hard polyvinyl chloride gasket and a preparation method thereof. The preparation raw materials of the transparent hard polyvinyl chloride gasket include, in parts by weight, 30-60 parts of polyvinyl chloride resin, 30-55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, 1-25 parts of chlorinated polyvinyl chloride, 1-10 parts of plasticizer and 0-10 parts of other auxiliary agents. The plasticizer includes butyl phthalate compound and octyl phthalate compound. The transparent hard polyvinyl chloride gasket has better heat resistance and light transmission performance, and can meet the use requirements in high-transparency and high-heat-resistance occasions.

Description

TECHNICAL FIELD

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

[0002] PVC is an amorphous thermoplastic polymer obtained by polymerization of monomer vinyl chloride, has excellent comprehensive mechanical properties, and has certain flame resistance, wear resistance and chemical corrosion resistance. Therefore, PVC has become a general-purpose plastic with high cost performance and is widely used in various fields, mainly in light industry, building materials, agriculture, daily life, packaging, power, public utilities and other fields.

[0003] Plastic gaskets gradually replace metal gaskets in the electrical industry due to their acid and alkali resistance and insulation. Hard polyvinyl chloride gaskets are favored by consumers due to their high impact strength. However, the heat distortion temperature of hard transparent polyvinyl chloride gaskets is low (≤70℃), which is easy to soften at high temperature and brittle at low temperature, and is prone to deformation, especially in environments with large temperature changes or under long-term stress. In addition, its light transmittance is that of a general transparent material (light transmittance ≤83%, haze ≥10%), which limits the application of transparent polyvinyl chloride gaskets in some high-transparency and high-heat-resistant applications. SUMMARY

[0004] Based on the above problems, the purpose of the present application is to provide a transparent hard polyvinyl chloride gasket and a preparation method thereof. The transparent hard polyvinyl chloride gasket has good heat resistance and light transmission performance, and can meet the requirements of high-transparency and high-heat-resistant applications.

[0005] To achieve the above purpose, the present application provides a transparent hard polyvinyl chloride gasket, the preparation raw materials of which include, in parts by weight, 30-60 parts of polyvinyl chloride resin, 30-55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, 1-25 parts of chlorinated polyvinyl chloride, 1-10 parts of plasticizer and 0-10 parts of other additives. The plasticizer includes butyl phthalate compounds and octyl phthalate compounds.

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

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

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

[0009] Preferably, the butyl phthalate compounds include at least one of dibutyl phthalate, butyl phenyl phthalate and monobutyl phthalate.

[0010] Preferably, the octyl phthalate compounds include at least one of di-n-octyl phthalate, diisooctyl phthalate and di-sec-octyl phthalate.

[0011] Preferably, the other auxiliary agents include at least one of heat stabilizers, toughening agents, lubricants and processing aids.

[0012] Preferably, the heat stabilizers include thiol methyl tin heat stabilizers and / or calcium zinc heat stabilizers.

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

[0014] Preferably, the lubricant comprises at least one of vinyl bis-stearamide, 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 comprises ACR acrylic resin.

[0016] The second aspect of the present application provides a method for preparing the transparent rigid PVC gasket, comprising the steps of: mixing the PVC resin, the methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, the chlorinated PVC, the plasticizer and the other additives by high-speed mixing to obtain a mixture, granulating the obtained mixture by using a double-screw granulator, and then feeding the granulated mixture into a two-roll rubber mill for plasticizing and molding.

[0017] Further, the double-screw granulator is divided into eight zones from the feeding to the discharging, and the temperature ranges of the eight zones are 110-130℃, 120-150℃, 130-160℃, 130-160℃, 130-160℃, 130-160℃, 130-160℃ and 130-160℃, respectively.

[0018] In the method, the PVC resin, the methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer and the chlorinated PVC are mixed, granulated, plasticized and molded under the action of the plasticizer and the other additives to obtain the gasket with the advantages of the three materials of composite PVC, CPVC and MABS, and the gasket has better heat resistance and light transmission performance. DETAILED DESCRIPTION

[0019] The transparent rigid PVC gasket of the present application can be used on electrical equipment, and of course, due to its better light transmission and heat resistance, it can also be used as other light transmission and heat resistant gaskets.

[0020] In the preparation of the transparent rigid PVC gasket, the raw materials include 30-60 parts of PVC resin, 30-55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, 1-25 parts of chlorinated PVC, 1-10 parts of plasticizer and 0-10 parts of other additives, all by weight.

[0021] In actual operation, the weight fraction of the polyvinyl chloride resin can be, but is 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 fraction of the methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer can be, but is 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 fraction of the polyvinyl chloride resin and the methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer can be the same or different. The weight fraction of the chlorinated polyvinyl chloride can be, but is 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 fraction 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, 10 parts. The butyl phthalate compound includes at least one of dibutyl phthalate, butyl phenyl phthalate, and monobutyl phthalate. The octyl phthalate compound includes at least one of di-n-octyl phthalate, diisooctyl phthalate, and di-sec-octyl phthalate.

[0023] The weight fraction of the other auxiliary agent can be, but is not limited to, 0 parts, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts. The other auxiliary agent includes at least one of a heat stabilizer, a toughening agent, a lubricant, and a processing aid. The heat stabilizer includes a thiol methyl tin heat stabilizer and / or a calcium zinc heat stabilizer. The toughening agent includes a methyl methacrylate-butadiene-styrene ternary block copolymer and / or an acrylate 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 ester, fatty acid polyester, and oleic acid amide. The processing aid includes an ACR acrylic resin.

[0024] In addition, the method for preparing the transparent hard polyvinyl chloride gasket can include the steps of: high-speed mixing the polyvinyl chloride resin, the methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, the chlorinated polyvinyl chloride, the plasticizer, and the other auxiliary agent to obtain a mixture, using a double-screw granulator to granulate the obtained mixture, and then feeding the granulated mixture into a two-roll rubber mill for plasticizing and then molding.

[0025] 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, and 130-160°C, respectively. The plasticating conditions can be 170-190°C for 5-30 minutes, and the molding temperature can be 180-210°C.

[0026] To better illustrate the object, technical scheme and beneficial effects of the present application, the present application will be further described below in combination with specific examples. It should be noted that the following description of the method is a further explanation and description of the present application, and should not be regarded as a limitation of the present application.

[0027] Example 1

[0028] The present example is a transparent hard polyvinyl chloride gasket. The raw materials for preparing the transparent hard polyvinyl chloride gasket include, by weight fraction, 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 thiomethyl tin 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 hard polyvinyl chloride gasket of the present example can be as follows: the polyvinyl chloride resin, the methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, the chlorinated polyvinyl chloride, the dibutyl phthalate, the di-n-octyl phthalate, the thiomethyl tin heat stabilizer, the methyl methacrylate-butadiene-styrene ternary block copolymer, the pentaerythritol stearate, and the ACR acrylic resin are subjected to high-speed mixing to obtain a mixture, the obtained mixture is granulated using a twin-screw granulator, and then is subjected to plastication in a double-roller rubber mill and molding.

[0030] Example 2

[0031] The present example is a transparent hard polyvinyl chloride gasket. The raw materials for preparing the transparent hard polyvinyl chloride gasket include, by weight fraction, 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 thiomethyl tin 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 embodiment can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, chlorinated polyvinyl chloride, dibutyl phthalate, di-n-octyl phthalate, thiol methyl tin heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are high-speed mixed to obtain a mixture, the obtained mixture is granulated using a double screw granulator, and then is put into a double roller rubber mill for plasticizing and then is molded.

[0033] Embodiment 3

[0034] The transparent rigid polyvinyl chloride gasket of the embodiment is prepared from 50 parts of polyvinyl chloride resin, 55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, 25 parts of chlorinated polyvinyl chloride, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of thiol methyl tin 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 embodiment can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, chlorinated polyvinyl chloride, dibutyl phthalate, di-n-octyl phthalate, thiol methyl tin heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are high-speed mixed to obtain a mixture, the obtained mixture is granulated using a double screw granulator, and then is put into a double roller rubber mill for plasticizing and then is molded.

[0036] Embodiment 4

[0037] The transparent rigid polyvinyl chloride gasket of the embodiment is prepared from 60 parts of polyvinyl chloride resin, 45 parts of methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, 20 parts of chlorinated polyvinyl chloride, 3 parts of dibutyl phthalate, 5 parts of di-n-octyl phthalate, 2 parts of thiol methyl tin 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 quaternary copolymer, chlorinated polyvinyl chloride, dibutyl phthalate, di-n-octyl phthalate, thiol methyl tin heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are subjected to high-speed mixing to obtain a mixture, the obtained mixture is granulated using a double screw granulator, and then is put into a double roller rubber mill for plasticizing and then is molded.

[0039] Example 5

[0040] The present embodiment is a transparent rigid polyvinyl chloride gasket. The raw materials for preparing the transparent rigid polyvinyl chloride gasket include, in parts by weight, 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, 15 parts of chlorinated polyvinyl chloride, 3 parts of toluene 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 quaternary copolymer, chlorinated polyvinyl chloride, toluene butyl phthalate, diisooctyl phthalate, calcium-zinc heat stabilizer, pentaerythritol stearate and ACR acrylic resin are subjected to high-speed mixing to obtain a mixture, the obtained mixture is granulated using a double screw granulator, and then is put into a double roller rubber mill for plasticizing and then is molded.

[0042] Example 6

[0043] The present embodiment is a transparent rigid polyvinyl chloride gasket. The raw materials for preparing the transparent rigid polyvinyl chloride gasket include, in parts by weight, 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, 15 parts of chlorinated polyvinyl chloride, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of acrylic ester-based toughening agent, 1 part of vinyl bis-stearamide 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 quaternary copolymer, chlorinated polyvinyl chloride, dibutyl phthalate, di-n-octyl phthalate, acrylic ester-based toughening agent, vinyl bis-stearamide and ACR acrylic resin are subjected to high-speed mixing to obtain a mixture, the obtained mixture is granulated using a double screw granulator, and then is put into a double roller rubber mill for plasticizing and then is molded.

[0045] Comparative Example 1

[0046] The present comparative example is a transparent rigid polyvinyl chloride gasket. The raw materials for preparing the transparent rigid polyvinyl chloride gasket include, in parts by weight, 100 parts of polyvinyl chloride resin, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of thiomethyl tin 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 method for preparing the transparent rigid polyvinyl chloride gasket of the present comparative example can be as follows: the polyvinyl chloride resin, dibutyl phthalate, di-n-octyl phthalate, thiomethyl tin heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate, and ACR acrylic resin are subjected to high-speed mixing to obtain a mixture, the obtained mixture is granulated using a double-screw granulator, and then is fed into a double-roll rubber mill for plasticizing and then is molded.

[0048] Comparative Example 2

[0049] The present comparative example is a transparent rigid polyvinyl chloride gasket. The raw materials for preparing the transparent rigid polyvinyl chloride gasket include, in parts by weight, 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, 4 parts of dibutyl phthalate, 4 parts of di-n-octyl phthalate, 3 parts of thiomethyl tin 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 method for preparing the transparent rigid polyvinyl chloride gasket of the present comparative example can be as follows: the polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, dibutyl phthalate, di-n-octyl phthalate, thiomethyl tin heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate, and ACR acrylic resin are subjected to high-speed mixing to obtain a mixture, the obtained mixture is granulated using a double-screw granulator, and then is fed into a double-roll rubber mill for plasticizing and then is molded.

[0051] Comparative Example 3

[0052] The present comparative example is a transparent rigid polyvinyl chloride gasket. The raw materials for preparing the transparent rigid polyvinyl chloride gasket include, in parts by weight, 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 thiomethyl tin 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 present comparative example can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, chlorinated polyvinyl chloride, thiol methyl tin heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are high-speed mixed to obtain a mixture, the obtained mixture is granulated using a double screw granulator, and then is put into a double roller rubber mill for plasticizing and then is molded.

[0054] Comparative Example 4

[0055] The present comparative example is a transparent rigid polyvinyl chloride gasket. The raw materials for preparing the transparent rigid polyvinyl chloride gasket include, by weight fraction, 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, 15 parts of chlorinated polyvinyl chloride, 3 parts of thiol methyl tin 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 present comparative example can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, chlorinated polyvinyl chloride, thiol methyl tin heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are high-speed mixed to obtain a mixture, the obtained mixture is granulated using a double screw granulator, and then is put into a double roller rubber mill for plasticizing and then is molded.

[0057] Comparative Example 5

[0058] The present example is a transparent rigid polyvinyl chloride gasket. The raw materials for preparing the transparent rigid polyvinyl chloride gasket include, by weight fraction, 100 parts of polyvinyl chloride resin, 50 parts of methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, 15 parts of chlorinated polyvinyl chloride, 4 parts of di-n-octyl phthalate, 3 parts of thiol methyl tin 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 present comparative example can be as follows: polyvinyl chloride resin, methyl methacrylate-acrylonitrile-butadiene-styrene quaternary copolymer, chlorinated polyvinyl chloride, thiol methyl tin heat stabilizer, methyl methacrylate-butadiene-styrene ternary block copolymer, pentaerythritol stearate and ACR acrylic resin are high-speed mixed to obtain a mixture, the obtained mixture is granulated using a double screw granulator, and then is put into a double roller rubber mill for plasticizing and then is molded.

[0060] Comparative Example 6

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

[0062] The method for preparing the transparent rigid PVC gasket of the comparative example can be as follows: the PVC resin, the methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, the chlorinated PVC, the dibutyl phthalate, the thiomethyl tin heat stabilizer, the methyl methacrylate-butadiene-styrene triblock copolymer, the pentaerythritol stearate, and the ACR acrylic resin are subjected to high-speed mixing to obtain a mixture, the obtained mixture is granulated using a double-screw granulator, and then is fed into a two-roll rubber mill for plasticizing and then is molded.

[0063] The transparent rigid PVC gaskets of Examples 1-6 and Comparative Examples 1-6 are subjected to performance testing, and the results are shown in Table 1, and the testing methods are as follows.

[0064] The specific gravity of the transparent rigid PVC gasket is tested using an electronic specific gravity meter. The tensile strength and the bending strength are tested according to GB / T 1040.1-2006 “Determination of tensile properties of plastics-Part 1: General principles” and GB / T 9341-2008 “Determination of flexural properties of plastics”. The transmittance and the haze of the transparent rigid PVC gasket are tested using a transmittance / haze tester.

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

[0066]

[0067]

[0068] As can be seen from the results in Table 1, the rigid PVC gasket prepared by using a high content of PVC resin in combination with a high content of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, and further assisted by chlorinated PVC resin, has a high Vicat softening point and a high transmittance and a low haze, indicating that the heat resistance and the transmittance are good. The use of butyl phthalate compounds and octyl phthalate compounds as plasticizers can solve the problem of poor compatibility of the high content of PVC resin and the high content of methyl methacrylate-acrylonitrile-butadiene-styrene tetrapolymer, so as to fully exert the advantages thereof.

[0069] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit the protection scope of the present application, and although the present application has been described in detail with reference to the preferred embodiments, it is not limited to the listed in the embodiments, and those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A transparent rigid polyvinyl chloride gasket, characterized in that, The raw materials for preparation, by weight, include 30-60 parts of polyvinyl chloride resin, 30-55 parts of methyl methacrylate-acrylonitrile-butadiene-styrene tetromer, 1-25 parts of chlorinated polyvinyl chloride, 1-10 parts of plasticizer, and 0-10 parts of other additives, 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 compounds include at least one of dibutyl phthalate, toluenebutyl phthalate, and monobutyl phthalate.

3. The transparent rigid polyvinyl chloride gasket according to claim 1, characterized in that, The octyl phthalate compounds include at least one of di-n-octyl phthalate, diisooctyl 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 heat stabilizers, toughening agents, lubricants, and processing aids.

5. The transparent rigid polyvinyl chloride gasket according to claim 4, characterized in that, The heat stabilizers include thiol methyltin heat stabilizers and / or calcium zinc heat stabilizers.

6. The transparent rigid polyvinyl chloride gasket according to claim 4, characterized in that, The toughening agent includes methyl methacrylate-butadiene-styrene terpolymer and / or acrylate toughening agents.

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

8. The transparent rigid polyvinyl chloride gasket according to claim 4, characterized in that, The processing aids include 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 process includes the following steps: mixing the polyvinyl chloride resin, the methyl methacrylate-acrylonitrile-butadiene-styrene tetromer, the chlorinated polyvinyl chloride, the plasticizer, and the other additives at high speed to obtain a mixture; granulating the mixture using a twin-screw granulator; and then feeding it into a two-roll mill 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, with temperature ranges of 110–130℃, 120–150℃, 130–160℃, 130–160℃, 130–160℃, 130–160℃, 130–160℃, and 130–160℃ respectively.

Images