CN113444347A - Reinforced thermoplastic plastic sheet and preparation method thereof - Google Patents

Reinforced thermoplastic plastic sheet and preparation method thereof Download PDF

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Publication number
CN113444347A
CN113444347A CN202110925691.6A CN202110925691A CN113444347A CN 113444347 A CN113444347 A CN 113444347A CN 202110925691 A CN202110925691 A CN 202110925691A CN 113444347 A CN113444347 A CN 113444347A
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reinforced thermoplastic
thermoplastic sheet
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whitening agent
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周群
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Sichuan Chengji New Material Co ltd
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Sichuan Chengji New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2425/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2425/18—Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2465/00—Characterised by the use of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2475/04—Polyurethanes

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  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

The invention discloses a reinforced thermoplastic sheet material, which comprises the following components in formula: 40 to 80 percent of raw material, 20 to 50 percent of transparent rim charge, 1 to 5 percent of toughening agent, 0.5 to 3 percent of whitening agent and 0.01 to 0.1 percent of antistatic auxiliary agent; the raw material is polyethylene glycol terephthalate, and the transparent rim charge is remained in the shearing process of the plastic sheet; the antistatic auxiliary agent comprises the following components: 20 to 30 percent of waterborne polyurethane resin, 40 to 60 percent of poly (ethylenedioxythiophene) -poly (styrene sulfonate), 3 to 7 percent of dimethyl sulfoxide, 0.1 to 0.8 percent of dimethylethanolamine, and N, N-diisopropanol-p-toluidine0.1-0.5 percent of water and 15-25 percent of water. The invention also discloses a preparation method of the reinforced thermoplastic sheet. The reinforced thermoplastic plastic sheet prepared by the invention has the characteristic of good electrical property, and the resistance of the sheet can be controlled to be 104‑107Within the range, the friction voltage can be controlled within 100v, and the surface resistance, the bulk resistance and the electrostatic value can be controlled within the required range.

Description

Reinforced thermoplastic plastic sheet and preparation method thereof
Technical Field
The invention relates to the technical field of thermoplastic plastics, in particular to a reinforced thermoplastic plastic sheet and a preparation method thereof.
Background
Static electricity is a static or non-flowing charge (a flowing charge forms a current). Static electricity is formed when charges are accumulated on an object or a surface, and the charges are classified into two kinds of positive charges and negative charges, that is, the static electricity phenomenon is also classified into two kinds, i.e., positive static electricity and negative static electricity.
The high molecular materials with certain conductive performance have the function of resisting charge accumulation (antistatic function), and the mechanism is that the accumulated charge is quickly released by utilizing the conductive capability of the high molecular materials. It is believed that the surface resistivity of the material is 10-9～10-12Omega, it has antistatic ability. In practical application, most antistatic high molecular materials are surface composite conductive layers or composite materials filled with conductive fillers, wherein the conductive fillers comprise anionic organic salts, cationic organic salts, nonionic polyols, metals and carbon black fillers. The antistatic polymer material may also be composed of an intrinsically conductive polymer material. Antistatic polymer materials are widely used in the field of manufacturing and using precision electronic instruments where dust and gas explosion prevention is required.
At present, the modified antistatic plastics mainly comprise two main types, one is conductive polystyrene plastics added with carbon black and the like, and the other is conductive polystyrene plastics added with some additives which have moisture absorption effect and are harmless to plastics, so that the surface resistance of the plastics is reduced to achieve the antistatic performance.
Antistatic agents are additives that are added to plastics or applied to the surface of molded articles to reduce static buildup, and are generally classified into an internal type and an external type according to the method of use. The action mechanism of the antistatic agent is as follows: the hydrophilic groups of the antistatic agent mainly increase the hygroscopicity of the surface of the film, adsorb moisture in the air, form a tiny water film and play a role in leaking charges.
Document "development and application of multifunctional antistatic agent and its master batch" discloses that adding antistatic agent into thermoplastic plastics can make the product have lubricating, demoulding, smooth and antistatic effects, but document does not disclose that adding antistatic agent into plastics can reduce the color difference of the product, and make the appearance of the product consistent.
In the prior art, the antistatic performance of the plastic sheet cannot meet the requirements of products, and people put higher demands on the performance of the plastic sheet.
Disclosure of Invention
The invention aims to provide a reinforced thermoplastic sheet and a preparation method thereof, which are used for solving the problem that the antistatic property of the plastic sheet in the prior art cannot meet the requirements of people at present.
To achieve the above objects, one embodiment of the present invention provides a reinforced thermoplastic sheet comprising the following formulation components:
40 to 80 percent of raw material, 20 to 50 percent of transparent rim charge, 1 to 5 percent of toughening agent,
0.5 to 3 percent of whitening agent and 0.01 to 0.1 percent of antistatic auxiliary agent;
the raw material is polyethylene glycol terephthalate, and the transparent rim charge is the remaining rim charge of the plastic sheet in the shearing process;
the antistatic auxiliary agent comprises the following components:
20 to 30 percent of waterborne polyurethane resin, 40 to 60 percent of poly (ethylenedioxythiophene) -poly (styrene sulfonate),
3 to 7 percent of dimethyl sulfoxide, 0.1 to 0.8 percent of dimethylethanolamine,
0.1 to 0.5 percent of N, N-diisopropyl alcohol p-toluidine and 15 to 25 percent of water.
In a preferred embodiment of the present invention, the toughening agent is at least one selected from the group consisting of dioctyl phthalate, dioctyl adipate, octyl epoxystearate, chlorinated paraffin and tricresyl phosphate.
In a preferred embodiment of the present invention, the whitening agent is at least one selected from the group consisting of whitening agent OB, whitening agent HE, whitening agent KCB, whitening agent OB-1, whitening agent HP-127 and whitening agent KSN.
In one preferable scheme of the invention, the polyethylene terephthalate is synthesized from purified terephthalic acid and ethylene glycol, and the particle size range of the polyethylene terephthalate is 2.5-3 mm.
Based on the reinforced thermoplastic sheet material provided by the invention, the invention also discloses a preparation method of the reinforced thermoplastic, which comprises the following steps:
(1) crushing: weighing raw materials and rim charge according to a ratio, and then crushing the raw materials and the rim charge;
(2) mixing: mixing the crushed raw materials, the scrap and the plasticizer, the whitening agent and the antistatic auxiliary agent which are weighed according to the proportion in a rubber mixing mill;
(3) molding: extruding and molding the mixed raw materials by a screw extruder;
(4) rolling: placing the formed sheet on a three-roller calender for calendering;
(5) shearing: shearing the rolled product according to the specification;
(6) oiling: coating a layer of lubricating oil on the sheared product;
(7) baking and cooling: baking the product after oiling, and then cooling;
(8) winding: and finishing rolling of the cooled product through a rolling machine.
In one preferable scheme of the invention, in the step (2), the mixing temperature is 50-90 ℃, and the mixing time is 30-60 min.
In one preferable scheme of the invention, in the step (3), the extrusion temperature of the screw extruder is 150-250 ℃, and the rotating speed of the screw extruder is 400-600 r/min.
In one preferable scheme of the invention, in the step (4), the temperatures of the upper, middle and lower three rollers of the three-roller calender are respectively 30-90 ℃, 30-90 ℃ and 10-60 ℃.
In a preferred embodiment of the present invention, in the step (6), the lubricant is a mineral base oil.
In summary, the invention has the following advantages:
1. the thermoplastic sheet prepared by the invention has the advantages of high strength and hardness, good chemical stability, good corrosion resistance, strong impact strength and small water absorption, and meanwhile, the thermoplastic sheet has good electrical property, and the resistance of the thermoplastic sheet can be controlled to be 104-107Within the range, the friction voltage can be controlled within 100v, and the surface resistance, the bulk resistance and the electrostatic value can be controlled within the required range.
2. According to the invention, the antistatic auxiliary agent is added into the raw materials, so that the prepared thermoplastic sheet has the advantage of high antistatic grade, and meanwhile, the appearance is consistent and has no color difference.
Detailed Description
Example 1
A reinforced thermoplastic sheet comprising the components of the following formulation: 59.96% of raw material, 34.99% of transparent rim charge, 3% of flexibilizer dioctyl phthalate, 2% of brightener OB, and 0.05% of antistatic auxiliary agent;
wherein the raw material is polyethylene terephthalate, one part of the polyethylene terephthalate is synthesized by 0.86 part of purified terephthalic acid and 0.34 part of ethylene glycol, and the particle size range of the polyethylene terephthalate is 2.5-3 mm;
the transparent rim charge is remained in the plastic sheet in the shearing process;
the antistatic auxiliary agent comprises the following components: 25% of aqueous polyurethane resin, 49.7% of poly (ethylenedioxythiophene) -poly (styrene sulfonate), 4.5% of dimethyl sulfoxide, 0.5% of dimethylethanolamine, 0.3% of N, N-diisopropanol-p-toluidine and 20% of water.
A method of making a reinforced thermoplastic sheet comprising the steps of:
(1) crushing: weighing raw materials and rim charge according to a ratio, then crushing the raw materials and the rim charge in a crusher, and controlling the particle size range of the crushed raw materials and rim charge within 1-2 mm;
(2) mixing: mixing the crushed raw materials, the scrap and the plasticizer, the whitening agent and the antistatic auxiliary agent which are weighed according to the proportion in a rubber mixing mill, so that the plasticizer, the whitening agent and the antistatic auxiliary agent are uniformly dispersed in the raw rubber, the granular compounding agent is in a dispersion phase, and the raw rubber is in a continuous phase; the mixing temperature is 50-90 ℃ during mixing, the mixing time is 30-60 min, and the mixing aims to improve the physical and mechanical properties of rubber products, improve the processing and forming process and reduce the production cost;
(3) molding: extruding and molding the mixed raw materials through a screw extruder, wherein the screw extruder can fully plasticize and uniformly mix the materials by means of pressure and shearing force generated by rotation of a screw, and molding through a neck ring die, wherein the extrusion temperature is 150-250 ℃ during extrusion molding, and the rotating speed of the screw extruder is 400-600 r/min;
(4) rolling: placing the formed sheet on a three-roll calender for calendering, wherein the temperatures of an upper three roll, a middle three roll and a lower three roll of the three-roll calender are respectively 30-90 ℃, 30-90 ℃ and 10-60 ℃ during calendering, and the roll speeds of the upper three roll, the middle three roll and the lower three roll are respectively 250-300 r/min, 150-200 r/min and 150-200 r/min, and the purpose of calendering is to increase the plasticity of a product and extend the product into a thin product on the basis of further plasticizing;
(5) shearing: shearing the rolled product according to the required specification;
(6) oiling: coating a layer of lubricating oil on the sheared product, wherein the lubricating oil is mineral base oil, and the purpose of coating the lubricating oil is to increase the corrosion resistance, acid and alkali resistance of the plastic sheet;
(7) baking and cooling: baking the product after oiling, and then cooling, wherein the baking temperature is 100-150 ℃ during baking;
(8) winding: the cooled product is wound by a winding machine;
(9) and (3) post-treatment: and crushing unqualified products and then recycling.
Example 2
A reinforced thermoplastic sheet comprising the components of the following formulation: 46.09% of raw material, 49.9% of transparent rim charge, 1% of flexibilizer dioctyl adipate, 3% of whitening agent HE, and 0.01% of antistatic auxiliary agent;
wherein the raw material is polyethylene terephthalate, one part of the polyethylene terephthalate is synthesized by 0.86 part of purified terephthalic acid and 0.34 part of ethylene glycol, and the particle size range of the polyethylene terephthalate is 2.5-3 mm;
the transparent rim charge is remained in the plastic sheet in the shearing process;
the antistatic auxiliary agent comprises the following components: 20% of aqueous polyurethane resin, 51.9% of poly (ethylenedioxythiophene) -poly (styrene sulfonate), 3% of dimethyl sulfoxide, 0.8% of dimethylethanolamine, 0.1% of N, N-diisopropanol-p-toluidine and 24.2% of water.
Example 2 a reinforced thermoplastic sheet was prepared in the same manner as in example 1.
Example 3
A reinforced thermoplastic sheet comprising the components of the following formulation: 74.4 percent of raw material, 20 percent of transparent rim charge, 5 percent of toughener epoxy stearic acid octyl ester, 0.5 percent of whitening agent KCB and 0.1 percent of antistatic auxiliary agent;
wherein the raw material is polyethylene terephthalate, one part of the polyethylene terephthalate is synthesized by 0.86 part of purified terephthalic acid and 0.34 part of ethylene glycol, and the particle size range of the polyethylene terephthalate is 2.5-3 mm;
the transparent rim charge is remained in the plastic sheet in the shearing process;
the antistatic auxiliary agent comprises the following components: 30% of aqueous polyurethane resin, 46.5% of poly (ethylenedioxythiophene) -poly (styrene sulfonate), 7% of dimethyl sulfoxide, 0.1% of dimethylethanolamine, 0.5% of N, N-diisopropanol-p-toluidine and 15.9% of water.
Example 3 a reinforced thermoplastic sheet was prepared in the same manner as in example 1.
Example 4
A reinforced thermoplastic sheet comprising the components of the following formulation: 50.07 percent of raw material, 41.9 percent of transparent rim charge, 5 percent of flexibilizer chlorinated paraffin, 5 percent of brightening agent HP-1273 percent and 0.03 percent of antistatic auxiliary agent;
wherein the raw material is polyethylene terephthalate, one part of the polyethylene terephthalate is synthesized by 0.86 part of purified terephthalic acid and 0.34 part of ethylene glycol, and the particle size range of the polyethylene terephthalate is 2.5-3 mm;
the transparent rim charge is remained in the plastic sheet in the shearing process;
the antistatic auxiliary agent comprises the following components: 20.2 percent of waterborne polyurethane resin, 60 percent of poly (ethylenedioxythiophene) -poly (styrene sulfonate), 3.8 percent of dimethyl sulfoxide, 0.3 percent of dimethylethanolamine, 0.2 percent of N, N-diisopropanol-p-toluidine and 15 percent of water.
Example 4 a reinforced thermoplastic sheet was prepared in the same manner as in example 1.
Comparative example 1
A thermoplastic sheet comprising the following formulation components: 59.96% of raw material, 34.99% of transparent rim charge, 3% of flexibilizer dioctyl phthalate, 2% of brightener OB, and 0.05% of antistatic auxiliary agent;
wherein the raw materials and the transparent rim charge are the same as those in the embodiment 1, and the antistatic auxiliary agent is a quaternary ammonium salt antistatic auxiliary agent;
comparative example 1 a thermoplastic sheet was prepared in the same manner as in example 1.
Comparative example 2
A thermoplastic sheet comprising the following formulation components: 59.96% of raw material, 34.99% of transparent rim charge, 3% of flexibilizer dioctyl phthalate, 2% of brightener OB, and 0.05% of antistatic auxiliary agent;
wherein the raw materials and the transparent rim charge are the same as those in the embodiment 1, and the antistatic auxiliary agent is phosphate;
comparative example 2 a thermoplastic sheet was prepared in the same manner as in example 1.
Comparative example 3
A thermoplastic sheet comprising the following formulation components: 60% of raw materials, 35% of transparent rim charge, 3% of a toughening agent dioctyl phthalate and 78% of a whitening agent OB 2%;
wherein the raw materials and the transparent rim charge are the same as in example 1;
comparative example 3 a thermoplastic sheet was prepared in the same manner as in example 1.
Experimental detection
The results of testing whether the thermoplastic sheets prepared in the examples and comparative examples have consistent tensile strength, elongation at break, tensile yield strength, surface resistivity, volume resistance, friction voltage, density, size, plastic flowability, and appearance are shown in tables 1 and 2.
The tensile strength, the elongation at break and the tensile yield strength are detected according to a detection method in GB13022-91 'Plastic film tensile property test method'.
The surface resistivity was measured according to the test method of ANSI/ESD STM11/11-2001, and the volume resistance was measured according to the test method of GB15662-1995 "volume resistivity test method of conductive and antistatic plastics".
The friction voltage test adopts a non-contact electrostatic voltmeter for measurement, when in test, the cloth is dried by holding with hands, the frequency is 120 times/min, the palm appropriately applies pressure, a certain part of the tested piece is rubbed unidirectionally for 20 times, the friction part is immediately approached according to the using method of the electrostatic voltmeter, and the observation instrument displays numerical values.
The density is detected according to a detection method in GB/T1033-86 test method for density and relative density of plastics; the thickness and the thinness of the ruler are determined by the size; the fluidity of the plastic is detected according to a detection method in GB/T21060-2007 determination of fluidity of the plastic; whether the appearances are consistent and have no color difference is observed manually.
Table 1: results of measurements of tensile strength, elongation at break, tensile yield strength, and surface resistivity of examples and comparative examples
Figure BDA0003209092110000081
Table 2: results of examining whether the volume resistance, the frictional voltage, the density, the size, the flowability of the plastic, and the appearance of the plastic were consistent or not in examples and comparative examples
Figure BDA0003209092110000082
Figure BDA0003209092110000091
As can be seen from tables 1 and 2: the thermoplastic sheet prepared by the embodiment has excellent quality, excellent tensile strength, elongation at break, tensile yield strength, surface resistivity, volume resistance, friction voltage and flowability, and consistent appearance without color difference; the antistatic agent is added into the thermoplastic plastic sheets obtained in the comparative examples 1 and 2, so that the prepared thermoplastic plastic sheets have excellent surface resistivity, volume resistance and friction voltage performance, but have poor flowability, color difference exists in appearance, and large difference occurs; the thermoplastic sheet prepared without the antistatic agent in comparative example 3 had the problems of poor surface resistivity, volume resistance, flowability and frictional voltage properties, and also had the problems of color difference in appearance and inconsistent product appearance.
By comparing example 1 with comparative examples 1-2 with different antistatic additives: the thermoplastic sheet prepared by the example 1 and the comparative examples 1-2 has the advantages that the differences of the tensile strength, the elongation at break, the tensile yield strength, the surface resistivity, the volume resistance and the friction voltage performance are not very large, the whole example 1 is better than the comparative examples 1-2, but the flowability of the example 1 is obviously better than that of the comparative examples 1-2, and the appearance is consistent and has no color difference and is obviously better than that of the comparative examples 1-2. Therefore, the antistatic auxiliary agent is added into the thermoplastic sheet to improve the antistatic grade of the thermoplastic sheet, but not all the antistatic auxiliary agents can improve the antistatic performance of products and simultaneously enable the appearance of the products to have consistency and no color difference; the antistatic auxiliary agent added in the invention can ensure that the flowability of the plastic sheet is improved while ensuring that the antistatic performance of the thermoplastic sheet is good, so that the appearance of the product is consistent and has no color difference.
The comparison between the example 1 with the antistatic additive of the present invention and the comparative example 3 without the antistatic additive shows that: example 1 the tensile strength, elongation at break and tensile yield strength of the thermoplastic sheet prepared by adding the antistatic additive of the invention are not very different from those of the plastic sheet prepared by not adding the antistatic additive in comparative example 3, but the flowability, surface resistivity, volume resistance and friction voltage are very different and are changed remarkably, and the appearance is consistent and has no color difference. Therefore, the antistatic auxiliary agent of the invention is added into the thermoplastic sheet, so that the antistatic performance of the product can be improved, the fluidity of the product can be improved, and the appearance of the product is consistent and has no color difference.
It can be seen by comparing the incorporation of the antistatic agent in comparative examples 1-2 with the incorporation of no antistatic agent in comparative example 3: the plastic sheets prepared by adding the antistatic agent into the comparative examples 1-2 have tensile strength, elongation at break, tensile yield strength and flowability which are not greatly different from those of the plastic sheets prepared by adding no antistatic agent into the comparative example 3, and have no remarkable change, and the appearance is consistent, has no color difference and has no remarkable change, but have large differences in surface resistivity, volume resistance and friction voltage and remarkable changes. Therefore, the incorporation of an antistatic agent into a plastic sheet can improve the antistatic properties of the product, but cannot improve the flowability of the product to change the appearance of the product and reduce the color difference of the product.
Therefore, the thermoplastic sheet prepared by the invention has the characteristics of excellent product performance, tensile strength and high yield strength, and the antistatic auxiliary agent is doped into the thermoplastic sheet, so that the product has excellent antistatic performance and can improve the fluidity of the product, and the appearance of the product has consistency and no color difference.

Claims (9)

1. A reinforced thermoplastic sheet characterized by: comprises the following components in formula:
40 to 80 percent of raw material, 20 to 50 percent of transparent rim charge, 1 to 5 percent of toughening agent,
0.5 to 3 percent of whitening agent and 0.01 to 0.1 percent of antistatic auxiliary agent;
the raw material is polyethylene glycol terephthalate, and the transparent rim charge is the remaining rim charge of the plastic sheet in the shearing process;
the antistatic auxiliary agent comprises the following components:
20 to 30 percent of waterborne polyurethane resin, 40 to 60 percent of poly (ethylenedioxythiophene) -poly (styrene sulfonate),
3 to 7 percent of dimethyl sulfoxide, 0.1 to 0.8 percent of dimethylethanolamine,
0.1 to 0.5 percent of N, N-diisopropyl alcohol p-toluidine and 15 to 25 percent of water.
2. The reinforced thermoplastic sheet of claim 1, wherein: the toughening agent is selected from at least one of dioctyl phthalate, dioctyl adipate, epoxy stearate octyl, chlorinated paraffin and tricresyl phosphate.
3. The reinforced thermoplastic sheet of claim 1, wherein: the whitening agent is at least one selected from the group consisting of whitening agent OB, whitening agent HE, whitening agent KCB, whitening agent OB-1, whitening agent HP-127 and whitening agent KSN.
4. The reinforced thermoplastic sheet of claim 1, wherein: the polyethylene terephthalate is synthesized from purified terephthalic acid and ethylene glycol, and the particle size range of the polyethylene terephthalate is 2.5 mm-3 mm.
5. A method for preparing a reinforced thermoplastic sheet material, characterized in that: the method comprises the following steps:
(1) crushing: weighing raw materials and rim charge according to a ratio, and then crushing the raw materials and the rim charge;
(2) mixing: mixing the crushed raw materials, the scrap and the plasticizer, the whitening agent and the antistatic auxiliary agent which are weighed according to the proportion in a rubber mixing mill;
(3) molding: extruding and molding the mixed raw materials by a screw extruder;
(4) rolling: placing the formed sheet on a three-roller calender for calendering;
(5) shearing: shearing the rolled product according to the specification;
(6) oiling: coating a layer of lubricating oil on the sheared product;
(7) baking and cooling: baking the product after oiling, and then cooling;
(8) winding: and finishing rolling of the cooled product through a rolling machine.
6. The method of claim 5, wherein the step of forming the reinforced thermoplastic sheet comprises: in the step (2), the mixing temperature is 50-90 ℃, and the mixing time is 30-60 min.
7. The method of claim 5, wherein the step of forming the reinforced thermoplastic sheet comprises: in the step (3), the extrusion temperature of the screw extruder is 150-250 ℃, and the rotation speed of the screw extruder is 400-600 r/min.
8. The method of claim 5, wherein the step of forming the reinforced thermoplastic sheet comprises: in the step (4), the temperatures of the upper, middle and lower three rollers of the three-roller calender are respectively 30-90 ℃, 30-90 ℃ and 10-60 ℃.
9. The method of claim 5, wherein the step of forming the reinforced thermoplastic sheet comprises: in the step (6), the lubricating oil is mineral base oil.
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Application publication date: 20210928