CN112898699A

CN112898699A - Hard PVC plastic and preparation method thereof

Info

Publication number: CN112898699A
Application number: CN202110096334.3A
Authority: CN
Inventors: 孙牡花
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2021-06-04

Abstract

The invention discloses a hard PVC plastic and a preparation method thereof, relating to the technical field of plastics; the hard PVC plastic comprises the components of polyvinyl chloride, acetic anhydride, ethylene oxide, a filler, a plasticizer, hexamethylenetetramine, a coloring agent, a stabilizer, bisphenol A and fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; the hard PVC plastic can improve the tensile strength, the elongation and the thermal deformation temperature of the plastic, and can reduce the yellowing index of the plastic, so that the performance of the plastic is improved, and the application range of the plastic can be expanded.

Description

Hard PVC plastic and preparation method thereof

Technical Field

The invention relates to the technical field of plastics, in particular to hard PVC plastic and a preparation method thereof.

Background

The polyvinyl chloride plastic is prepared by using PVC resin as a main raw material and additives such as a stabilizer, a plasticizer, a lubricant, a filler and the like as auxiliary materials through scientific formula combination, molding at a certain temperature and under a certain pressure, and cooling and solidifying to obtain a PVC plastic product with a specific shape. PVC products are different in softness and hardness. In general, PVC products in which the amount of plasticizer in the formulation is less than 10PHR are referred to as rigid products; the PVC product with the plasticizer dosage of 10-40 PHR is called a semi-rigid product; PVC articles having plasticizers in amounts exceeding 40PHR are referred to as flexible articles. In order to improve the melt processability of PVC and the melt processability of a PVC formula, a processing aid is added into the PVC formula. The practice proves that the hard PVC product can not be melt-formed without processing aid, and the soft PVC product can be hardly formed without or without processing aid. The processing aid of PVC is mainly acrylate resin (ACR) with good compatibility with PVC, Chlorinated Polyethylene (CPE), chlorosulfonated polyethylene, methyl styrene polymer, MBS, ABS and the like. The hard plastic has wide application and can be used for pipes, toys and the like.

The hard PVC plastic and the preparation method thereof provided by the invention can enable the plastic to have better performance.

Disclosure of Invention

The invention aims to provide a hard PVC plastic and a preparation method thereof, wherein the PVC plastic consists of polyvinyl chloride, acetic anhydride, ethylene oxide, a filler, a plasticizer, a hardener, a colorant, a stabilizer, an antioxidant and a lubricant, and all the components interact with each other to improve the tensile strength, the elongation and the heat deformation temperature of the plastic, reduce the yellowing index of the plastic, improve the performance of the plastic and expand the application range of the plastic.

In order to achieve the purpose, the invention provides the following technical scheme:

the hard PVC plastic comprises the following components in parts by weight:

50-60 parts of polyvinyl chloride, 5-10 parts of acetic anhydride, 1-8 parts of ethylene oxide, 10-18 parts of filler, 3-11 parts of plasticizer, 1-5 parts of hardener, 0.5-2 parts of colorant, 10-15 parts of stabilizer, 5-12 parts of antioxidant and 3-10 parts of lubricant.

Wherein the filler is composed of fibers, mica and graphite.

As a further scheme of the invention: the paint comprises the following components in parts by weight:

53-58 parts of polyvinyl chloride, 7-9 parts of acetic anhydride, 3-6 parts of ethylene oxide, 13-16 parts of filler, 5-9 parts of plasticizer, 2-4 parts of hardener, 1-1.6 parts of colorant, 12-14 parts of stabilizer, 8-10 parts of antioxidant and 5-8 parts of lubricant.

55 parts of polyvinyl chloride, 8 parts of acetic anhydride, 5 parts of ethylene oxide, 14 parts of filler, 7 parts of plasticizer, 3 parts of hardening agent, 1.3 parts of coloring agent, 13 parts of stabilizer, 9 parts of antioxidant and 7 parts of lubricant.

As a further scheme of the invention: the mass percentages of the fiber, the mica and the graphite in the filler are respectively 28 percent, 35 percent and 37 percent.

As a further scheme of the invention: the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2: 3.

As a further scheme of the invention: the hardener is hexamethylenetetramine.

As a further scheme of the invention: the stabilizer comprises a mixture of sodium stearate and lead white in any proportion.

As a further scheme of the invention: the lubricant is a fatty acid.

As a further scheme of the invention: the antioxidant is bisphenol A.

A method for preparing the rigid PVC plastic according to any one of claims 1 to 3, comprising the following steps:

(1) adding polyvinyl chloride, acetic anhydride and ethylene oxide into a grinder, grinding at a high speed, sieving with a 100-120-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, stirring uniformly, standing until the mixture is air-dried, and then, caking the powder;

(2) crushing the filler, the plasticizer, the hardening agent, the coloring agent, the stabilizer, the antioxidant and the lubricant, adding the air-dried agglomerated powder into the crushed powder, stirring and mixing the mixture at a high speed to obtain a mixture, and heating the mixture at 80-100 ℃ for 30-40 min;

(3) and (3) placing the mixture heated in the step (2) into a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened.

Compared with the prior art, the invention has the beneficial effects that:

the PVC plastic disclosed by the invention is composed of polyvinyl chloride, acetic anhydride, ethylene oxide, a filler, a plasticizer, a hardening agent, a coloring agent, a stabilizer, an antioxidant and a lubricant, and all components are interacted after the preparation process, so that the tensile strength, the elongation and the heat deformation temperature of the plastic can be further improved, the yellowing index of the plastic can be reduced, the performance of the plastic can be improved, and the application range of the plastic can be expanded.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

Preparing 50 parts of polyvinyl chloride, 5 parts of acetic anhydride, 1 part of ethylene oxide, 10 parts of filler, 3 parts of plasticizer, 1 part of hexamethylenetetramine, 0.5 part of coloring agent, 10 parts of stabilizer, 5 parts of bisphenol A and 3 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride, acetic anhydride and ethylene oxide into a grinder to grind at high speed, sieving by a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, uniformly stirring, standing until the mixture is air-dried, and then, caking the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

Example 2

Preparing 52 parts of polyvinyl chloride, 6 parts of acetic anhydride, 2 parts of ethylene oxide, 11 parts of filler, 4 parts of plasticizer, 1.5 parts of hexamethylenetetramine, 0.7 part of coloring agent, 11 parts of stabilizer, 6 parts of bisphenol A and 4 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride, acetic anhydride and ethylene oxide into a grinder to grind at high speed, sieving by a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, uniformly stirring, standing until the mixture is air-dried, and then, caking the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

Example 3

Preparing 53 parts of polyvinyl chloride, 7 parts of acetic anhydride, 3 parts of ethylene oxide, 13 parts of filler, 5 parts of plasticizer, 2 parts of hexamethylenetetramine, 1 part of coloring agent, 12 parts of stabilizer, 8 parts of bisphenol A and 5 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride, acetic anhydride and ethylene oxide into a grinder to grind at high speed, sieving by a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, uniformly stirring, standing until the mixture is air-dried, and then, caking the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

Example 4

Preparing 54 parts of polyvinyl chloride, 7.5 parts of acetic anhydride, 4 parts of ethylene oxide, 13.5 parts of filler, 6 parts of plasticizer, 2.5 parts of hexamethylenetetramine, 1.2 parts of colorant, 12.5 parts of stabilizer, 8.5 parts of bisphenol A and 6 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride, acetic anhydride and ethylene oxide into a grinder to grind at high speed, sieving by a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, uniformly stirring, standing until the mixture is air-dried, and then, caking the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

Example 5

Preparing 55 parts of polyvinyl chloride, 8 parts of acetic anhydride, 5 parts of ethylene oxide, 14 parts of filler, 7 parts of plasticizer, 3 parts of hexamethylenetetramine, 1.3 parts of colorant, 13 parts of stabilizer, 9 parts of bisphenol A and 7 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride, acetic anhydride and ethylene oxide into a grinder to grind at high speed, sieving by a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, uniformly stirring, standing until the mixture is air-dried, and then, caking the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

Example 6

Preparing 57 parts of polyvinyl chloride, 8.5 parts of acetic anhydride, 5.5 parts of ethylene oxide, 15 parts of filler, 8 parts of plasticizer, 3.5 parts of hexamethylenetetramine, 1.4 parts of colorant, 13.5 parts of stabilizer, 9.5 parts of bisphenol A and 7.5 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride, acetic anhydride and ethylene oxide into a grinder to grind at high speed, sieving by a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, uniformly stirring, standing until the mixture is air-dried, and then, caking the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

Example 7

Preparing 58 parts of polyvinyl chloride, 9 parts of acetic anhydride, 6 parts of ethylene oxide, 16 parts of filler, 9 parts of plasticizer, 4 parts of hexamethylenetetramine, 1.6 parts of coloring agent, 14 parts of stabilizer, 10 parts of bisphenol A and 8 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride, acetic anhydride and ethylene oxide into a grinder to grind at high speed, sieving by a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, uniformly stirring, standing until the mixture is air-dried, and then, caking the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

Example 8

Preparing 59 parts of polyvinyl chloride, 9.5 parts of acetic anhydride, 7 parts of ethylene oxide, 17 parts of filler, 10 parts of plasticizer, 4.5 parts of hexamethylenetetramine, 1.8 parts of coloring agent, 14.5 parts of stabilizer, 11 parts of bisphenol A and 9 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride, acetic anhydride and ethylene oxide into a grinder to grind at high speed, sieving by a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, uniformly stirring, standing until the mixture is air-dried, and then, caking the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

Example 9

Preparing 60 parts of polyvinyl chloride, 10 parts of acetic anhydride, 8 parts of ethylene oxide, 18 parts of filler, 11 parts of plasticizer, 5 parts of hexamethylenetetramine, 2 parts of coloring agent, 15 parts of stabilizer, 12 parts of bisphenol A and 10 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride, acetic anhydride and ethylene oxide into a grinder to grind at high speed, sieving by a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, uniformly stirring, standing until the mixture is air-dried, and then, caking the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

Test examples

The properties of the rigid PVC plastics obtained in examples 1 to 9 and commercially available rigid PVC types A and B were measured, and the measured items included tensile strength, elongation, heat distortion temperature and yellowing index.

Test example 1

Taking enough hard PVC plastic prepared in example 1, and measuring the tensile strength, the elongation and the heat distortion temperature according to a conventional method;

putting the hard PVC plastic prepared in the embodiment 1 into a vulcanizing machine, pressing into a sheet with the thickness of 1mm, cold-pressing, molding and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

the measured tensile strength, elongation, heat distortion temperature and yellowing index were recorded.

Test example 2

Taking enough hard PVC plastic prepared in the embodiment 2, and measuring the tensile strength, the elongation and the heat distortion temperature of the hard PVC plastic according to a conventional method;

putting the hard PVC plastic prepared in the example 2 into a vulcanizing machine, pressing into a sheet with the thickness of 1mm, cold-pressing, molding and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

Test example 3

Taking enough hard PVC plastic prepared in the embodiment 3, and measuring the tensile strength, the elongation and the heat distortion temperature according to a conventional method;

putting the hard PVC plastic prepared in the embodiment 3 into a vulcanizing machine, pressing into a sheet with the thickness of 1mm, cold-pressing, molding and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

Test example 4

Taking enough hard PVC plastic prepared in the embodiment 4, and measuring the tensile strength, the elongation and the heat distortion temperature according to a conventional method;

putting the hard PVC plastic prepared in the embodiment 4 into a vulcanizing machine, pressing into a sheet with the thickness of 1mm, cold-pressing, molding and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

Test example 5

Taking enough hard PVC plastic prepared in example 5, and measuring the tensile strength, the elongation and the heat distortion temperature according to a conventional method;

putting the hard PVC plastic prepared in the example 5 into a vulcanizing machine, pressing into a sheet with the thickness of 1mm, cold-pressing, molding and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

Test example 6

Taking enough hard PVC plastic prepared in the embodiment 6, and measuring the tensile strength, the elongation and the heat distortion temperature according to a conventional method;

putting the hard PVC plastic prepared in the embodiment 6 into a vulcanizing machine, pressing into a sheet with the thickness of 1mm, cold-pressing, molding and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

Test example 7

Taking enough hard PVC plastic prepared in example 7, and measuring the tensile strength, the elongation and the heat distortion temperature according to a conventional method;

putting the hard PVC plastic prepared in the embodiment 7 into a vulcanizing machine, pressing into a sheet with the thickness of 1mm, cold-pressing, molding and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

Test example 8

Taking enough hard PVC plastic prepared in the embodiment 8, and measuring the tensile strength, the elongation and the heat distortion temperature according to a conventional method;

putting the hard PVC plastic prepared in the embodiment 8 into a vulcanizing machine, pressing into a sheet with the thickness of 1mm, cold-pressing, molding and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

Test example 9

Taking enough hard PVC plastic prepared in example 9, and measuring the tensile strength, the elongation and the heat distortion temperature according to a conventional method;

putting the hard PVC plastic prepared in the example 9 into a vulcanizing machine, pressing into a sheet with the thickness of 1mm, cold-pressing, molding and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

Control group 1

Taking sufficient commercially available A-type rigid PVC plastic, and measuring the tensile strength, the elongation and the heat distortion temperature of the A-type rigid PVC plastic according to a conventional method;

putting commercially available A-type hard PVC plastic into a vulcanizing machine, pressing into sheets with the thickness of 1mm, cold-pressing, molding, and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

Control group 2

Taking sufficient quantity of commercially available B-type rigid PVC plastics, and measuring the tensile strength, the elongation and the heat distortion temperature of the B-type rigid PVC plastics according to a conventional method;

putting commercially available B-type hard PVC plastic into a vulcanizing machine, pressing into sheets with the thickness of 1mm, cold-pressing, molding, and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

The test results of test examples 1-9 and control groups 1-2 are listed below:

according to the data in the table, the test results of the test examples 1-9 are obviously superior to those of the control groups 1-2, which proves that the performance of the plastic prepared in the examples 1-9 is obviously superior to that of the plastic A sold in the market and the plastic B sold in the market.

Comparative example

Comparative example 1

Preparing 55 parts of polyvinyl chloride, 5 parts of ethylene oxide, 14 parts of filler, 7 parts of plasticizer, 3 parts of hexamethylenetetramine, 1.3 parts of colorant, 13 parts of stabilizer, 9 parts of bisphenol A and 7 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride and ethylene oxide into a grinder, grinding at a high speed, sieving with a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, stirring uniformly, standing until the mixture is air-dried, and then agglomerating the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

Taking the prepared hard PVC plastic, and measuring the tensile strength, the elongation and the heat distortion temperature of the hard PVC plastic according to a conventional method;

putting the prepared hard PVC plastic into a vulcanizing machine, pressing into sheets with the thickness of 1mm, cold-pressing, molding and cutting into sample strips with the thickness of 5cm multiplied by 10 cm; placing the plastic into a xenon lamp insolation light aging test box for irradiation according to a GB/T16422.2-1999 plastic laboratory light source exposure test method, and then measuring the yellowing index of the plastic according to a GB 2409-80 plastic yellow index test method;

comparative example 2

Preparing 55 parts of polyvinyl chloride, 8 parts of acetic anhydride, 14 parts of filler, 7 parts of plasticizer, 3 parts of hexamethylenetetramine, 1.3 parts of colorant, 13 parts of stabilizer, 9 parts of bisphenol A and 7 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride and acetic anhydride into a grinder, grinding at a high speed, sieving with a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, stirring uniformly, standing until the mixture is air-dried, and then agglomerating the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

comparative example 3

Preparing 55 parts of polyvinyl chloride, 14 parts of filler, 7 parts of plasticizer, 3 parts of hexamethylenetetramine, 1.3 parts of colorant, 13 parts of stabilizer, 9 parts of bisphenol A and 7 parts of fatty acid, wherein the filler consists of 28 mass percent of fiber, 35 mass percent of mica and 37 mass percent of graphite; the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2:3, and the stabilizer consists of sodium stearate and lead white in a mass ratio of 1: 1; adding polyvinyl chloride into a grinder, grinding at a high speed, sieving with a 100-mesh sieve to obtain powder, adding 5ml of deionized water into the powder, stirring uniformly, standing until the mixture is air-dried, and then agglomerating the powder; grinding the filler, the plasticizer, the hexamethylenetetramine, the colorant, the stabilizer, the bisphenol A and the fatty acid, adding the air-dried agglomerated powder into the ground material, stirring the mixture at a high speed to obtain a mixture, and heating the mixture at 80 ℃ for 40 min; and (3) placing the heated mixture in a mold cavity, and pressurizing and heating at 250 ℃ and 25Mpa until the material is hardened to obtain the hard PVC plastic.

the test results for comparative examples 1-3 are listed below:

according to the data in the table, the test results of the comparative examples 1 to 3 are obviously lower than those of the test examples 1 to 9, so that the tensile strength, the elongation and the heat deformation temperature of the plastic can be improved, the yellowing index of the plastic can be reduced, the performance of the plastic can be improved, and the application range of the plastic can be expanded.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The hard PVC plastic is characterized by comprising the following components in parts by weight:

50-60 parts of polyvinyl chloride, 5-10 parts of acetic anhydride, 1-8 parts of ethylene oxide, 10-18 parts of filler, 3-11 parts of plasticizer, 1-5 parts of hardener, 0.5-2 parts of colorant, 10-15 parts of stabilizer, 5-12 parts of antioxidant and 3-10 parts of lubricant;

wherein the filler is composed of fibers, mica and graphite.

2. The rigid PVC plastic according to claim 1, comprising the following components in parts by weight:

3. The rigid PVC plastic according to claim 2, comprising the following components in parts by weight:

4. A rigid PVC plastic according to any one of claims 1 to 3, wherein the mass percentages of the fibers, mica and graphite in the filler are 28%, 35% and 37%, respectively.

5. The rigid PVC plastic according to any one of claims 1 to 3, wherein the plasticizer consists of dibutyl phthalate and xylene ketone in a mass ratio of 2: 3.

6. A rigid PVC plastic according to any of claims 1 to 3, characterized in that the hardener is hexamethylenetetramine.

7. The rigid PVC plastic according to any one of claims 1 to 3, wherein the stabilizer comprises a mixture of sodium stearate and lead white in any ratio.

8. A rigid PVC plastic according to any of claims 1 to 3, wherein the lubricant is a fatty acid.

9. The rigid PVC plastic according to any one of claims 1 to 3, wherein the antioxidant is bisphenol A.

10. A method for preparing rigid PVC plastic according to any one of claims 1 to 3, comprising the following steps: