CN110343370B

CN110343370B - PET (polyethylene terephthalate) antistatic sheet and processing technology and application thereof

Info

Publication number: CN110343370B
Application number: CN201910588946.7A
Authority: CN
Inventors: 张乐军
Original assignee: Dongguan Yingkun Electronic Technology Co ltd
Current assignee: Dongguan Yingkun Electronic Technology Co ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2021-09-14
Anticipated expiration: 2039-06-28
Also published as: CN110343370A

Abstract

The invention relates to the technical field of composite plastic sheets, in particular to a PET (polyethylene terephthalate) antistatic sheet, which comprises a sheet base layer and an antistatic layer formed by coating antistatic liquid on the surface of the sheet base layer, wherein the sheet base layer is prepared from the following raw materials in parts by weight: 70-80 parts of PET (polyethylene terephthalate) anti-static sheet material broken material, 20-30 parts of PET particles and 0.1-0.5 part of brightening agent, wherein the PET anti-static sheet material broken material contains 90-97wt% of PET; the PET antistatic sheet is processed at lower cost to obtain a sheet with good antistatic performance and good product stability; also relates to the application of the PET antistatic sheet in the processing of plastic trays and electronic part trays.

Description

PET (polyethylene terephthalate) antistatic sheet and processing technology and application thereof

Technical Field

The invention relates to the technical field of composite plastic sheets, in particular to a PET (polyethylene terephthalate) antistatic sheet and a processing technology and application thereof.

Background

The composite plastic sheet is made up by using PVC, PS, PP, PET and ABS as base material and adding auxiliary additive through a certain preparation process. The surface resistance of the conductive sheet is 10⁴-10⁵The surface resistance of the antistatic sheet or the semiconductive sheet is 10 in the range of Ω⁶-10¹²Omega range, surface resistance of 10⁶-10⁹Sheets in omega range are not easily affected by the temperature and humidity of the environment, and the surface resistance is 10¹⁰-10¹²Sheets in the omega range are more susceptible to environmental temperature and humidity. The composite plastic sheet has the characteristics of green transparency, environmental protection and no carbon powder, has excellent wear resistance, stable surface resistance, no discharge of gas and volatile matters, has strong protection effect on electronic parts, and is widely applied to manufacturing IC trays, liquid crystal trays, electronic part trays, FPC trays and the like.

Wherein, in electronic parts machining, need transport electronic parts to different assembly lines along with the process of processing lines and process, need realize lifting and transporting electronic parts with blister supporting plate or electronic parts tray in the transportation. Because electronic parts are greatly influenced by the environment, if the plastic sucking tray or the electronic part tray is provided with static electricity, the tray can easily adsorb dust in the air under the action of the static electricity of the tray, the electronic parts on the tray are polluted, and the processing quality of the electronic parts is influenced. In addition, if the tray is charged with static electricity, electrostatic breakdown can be generated, which is very easy to cause internal damage of electronic parts and harm the quality of the electronic parts. In order to solve the problem of static electricity on the blister trays or the electronic part trays, a plurality of anti-static sheets for processing the blister trays or the electronic part trays exist at present.

In the prior art, the main material of the PET antistatic sheet is PET (polyethylene terephthalate) particles, and is prepared by matching with antistatic agent/liquid and toner, wherein the addition amount of the PET particles is generally more than 80 wt%, and the addition amount is large; the addition amount of the antistatic agent/liquid is 10-20 wt%, the addition amount is large, and the cost is high.

The traditional PET antistatic sheet processing technology comprises the following steps: coating the antistatic agent/liquid on the surface of the sheet base layer by a coating method to form an antistatic layer; the sheet substrate is a simple sheet formed by melt extrusion of PET particles and toner. The coating method of directly coating on the sheet base layer has the advantages of quick effect, material saving, low requirement on the heat resistance of the antistatic agent and the like, but the antistatic effect cannot be durable, and the coating of the antistatic agent can disappear after friction, ultraviolet irradiation and high-temperature storage, so that the antistatic durability is poor.

Disclosure of Invention

Aiming at the defects in the prior art, the first purpose of the invention is to provide a PET antistatic sheet, wherein the main material of the sheet is a broken PET antistatic sheet material, and the production cost is reduced.

The first purpose of the invention is realized by the following technical scheme:

the PET antistatic sheet comprises a sheet base layer and an antistatic layer formed by coating antistatic liquid on the surface of the sheet base layer, wherein the sheet base layer is prepared from the following raw materials in parts by weight: 70-80 parts of PET (polyethylene terephthalate) antistatic sheet material broken material, 20-30 parts of PET particles and 0.1-0.5 part of brightening agent, wherein the PET antistatic sheet material broken material contains 90-97wt% of PET.

By adopting the technical scheme, the PET antistatic sheet crushing material is used as the main material of the sheet to replace pure PET particles, and the PET antistatic sheet crushing material is waste and leftovers generated in the process of producing the blister tray or the electronic part tray by the applicant at home, so that resources are saved, and the production cost is reduced.

Preferably, the sheet base layer is prepared from the following raw materials in parts by weight: 72-78 parts of PET antistatic sheet broken material, 22-28 parts of PET particles and 0.15-0.3 part of whitening agent.

Preferably, the total weight of the antistatic layer is 1 to 5% of the total weight of the sheet base layer.

By adopting the technical scheme, the dosage of the antistatic layer is limited, the addition is obtained after the applicant verifies through a large number of creative experiments, and on the basis of ensuring the antistatic performance of the sheet, the addition of the antistatic layer is reduced, and the production cost is reduced. The antistatic layer is coated on the surface of the sheet base layer, the sheet base layer has antistatic performance, and the antistatic layer can overcome the defect of poor antistatic durability of the traditional coating method and improve the antistatic performance of the sheet.

Preferably, the antistatic sheet comprises a sheet base layer and an antistatic layer formed by coating an antistatic liquid on the surface of the sheet base layer, wherein the sheet base layer is prepared from the following raw materials in parts by weight: 70-80 parts of PET anti-static sheet material, 20-30 parts of PET particles and 0.5-8 parts of color master batch, wherein the PET anti-static sheet material contains 85-95wt% of PET.

By adopting the technical scheme, the color master batches with different colors are added according to different required sheets to obtain the sheet with the required color.

Preferably, the sheet base layer is prepared from the following raw materials in parts by weight: 73-77 parts of PET antistatic sheet broken material, 23-27 parts of PET particles and 1-5 parts of color master batch.

Preferably, the total weight of the antistatic layer is 0.46 to 2.0% of the total weight of the sheet base layer.

The second purpose of the invention is to provide a processing technology of the PET antistatic sheet, which is obtained by processing the following operation steps:

preprocessing a PET anti-static sheet material crushing material;

mixing the PET antistatic sheet crushed material and other raw materials of the sheet base layer according to the weight parts, and carrying out melt extrusion molding to obtain the sheet base layer;

and (3) coating the antistatic liquid on the surface of the sheet base layer, and baking, cooling and forming to form the PET antistatic sheet.

By adopting the technical scheme, the PET antistatic sheet crushing material is added into the sheet base layer, so that the cost can be saved, and an antistatic component is introduced into the sheet base layer, so that the sheet base layer has an antistatic effect while providing an intermediate layer support; the antistatic layer is coated on the surface of the sheet base layer, so that antistatic components in the sheet base layer are protected by the external antistatic layer, and the antistatic performance of the sheet base layer is not easily reduced due to factors such as friction, illumination and the like; the sheet material has the advantages of blending and external coating, and achieves excellent antistatic performance.

Preferably, the broken PET antistatic sheet material is selected from leftovers generated in the process of processing a plastic sucking tray and an electronic part tray.

By adopting the technical scheme, resources are saved, waste of leftovers is avoided, waste is turned into wealth, and the production cost of the PET antistatic sheet is reduced.

Preferably, the baking operation temperature is 70-100 ℃, and the baking time is 7-10 s.

By adopting the technical scheme, a large number of experiments show that the tensile strength and the impact strength of the sheet material after the baking time is too long can be greatly and negatively influenced, and the antistatic performance is less influenced, and probably because the sheet material is locally remolded due to too long baking time, the density distribution of each part of the sheet material is uneven, and the mechanical performance of the sheet material is influenced. Too short a baking time may result in a decrease in the antistatic properties of the sheet, possibly because too short a baking time may result in the antistatic liquid not being completely coated firmly on the surface of the sheet base layer.

The third purpose of the invention is to provide an application of the PET antistatic sheet, wherein the PET antistatic sheet is used for processing a blister tray and an electronic part tray. The PET antistatic sheet waste and leftovers generated in the processing process can be recycled and used as main raw materials for processing and producing new PET antistatic sheets, so that the production cost is saved.

In conclusion, the invention has the following beneficial effects:

(1) the addition amount of antistatic liquid of the traditional PET antistatic sheet is 10-20% of the total weight of the sheet, the total weight of the antistatic layer only accounts for 1-5% or 0.46-2.0% of the total weight of a base layer of the sheet (accounts for 0.99-4.8% or 0.5-2% of the total weight of the sheet), the use amount of the antistatic liquid is saved, and the antistatic liquid is matched with the antistatic component in a middle layer crushing material, so that the effect of good antistatic performance is realized under the condition of low addition amount;

(2) the invention utilizes the waste and the leftovers generated by the applicant's own production tray to form the PET anti-static sheet crushing material instead of the PET anti-static sheet crushing materialThe PET antistatic sheet is produced by replacing most PET particles, the production cost is saved, and the lowest surface resistance of the obtained PET antistatic sheet is 7 multiplied by 10⁶The antistatic property is good;

(3) the sheet has a three-layer structure, the middle layer contains antistatic components, the surface layer is coated with the antistatic layer, the antistatic agent has the advantages of antistatic durability of a blending method and low addition amount and quick response of the antistatic agent of a coating method, and the production cost is saved under the condition of better antistatic performance.

Detailed Description

The antistatic liquid in the invention is Baoyi 220 permanent antistatic liquid with 99% of effective substance content; the PET particles are injection molding grade PET particles of Shanghai Yuannan 602; the whitening agent is SE1218PET yellow-eliminating agglomerate; the color master batch selects injection molding grade color master batch with the brand number of KS-PET.

Example 1

The PET antistatic sheet is obtained by processing through the following processing technology:

collecting PET (polyethylene terephthalate) antistatic sheet waste and PET antistatic sheet leftovers generated by processing a blister tray or an electronic part tray in a workshop, and crushing the PET antistatic sheet waste and the PET antistatic sheet leftovers into blocky materials for later use; the broken PET antistatic sheet material contains 90 wt% of PET, 0.83 wt% of carboxylic acid hydrophilic group (-COOH), 0.15 wt% of alcohol hydrophilic group (-OH) and 0.54 wt% of quaternary ammonium salt hydrophilic group (-NX), and is leftover and waste materials produced by other batches of PET antistatic plastic suction molds produced by the inventor;

weighing the crushed PET antistatic sheet material, PET particles and a whitening agent according to the weight parts in the table 1, mixing the materials by a mixer to obtain a mixture, feeding the mixture into a double-screw extruder, melting and plasticizing, controlling the extrusion temperature to be 245 ℃, performing extrusion molding, and cooling to obtain a sheet base layer;

measuring antistatic liquid according to the addition amount in the table 1, and diluting the antistatic liquid according to the dilution ratio of the electrostatic agent, isopropanol and water, wherein the volume ratio of the electrostatic agent to the isopropanol to the water is 1: 2; coating the diluted antistatic liquid on the surface of the sheet base layer by a coating machine; and then, the sheet is sent into an oven, baked for 9s at 85 ℃, cooled and formed to form the PET antistatic sheet with a three-layer structure.

Example 2

collecting PET (polyethylene terephthalate) antistatic sheet waste and PET antistatic sheet leftovers generated by processing a blister tray or an electronic part tray in a workshop, and crushing the PET antistatic sheet waste and the PET antistatic sheet leftovers into blocky materials for later use; the PET anti-static sheet broken material contains 92 wt% of PET, 0.82 wt% of carboxylic acid hydrophilic groups, 0.16 wt% of alcohol hydrophilic groups and 0.55 wt% of quaternary ammonium salt hydrophilic groups, and is leftovers and waste materials generated by other batches of PET anti-static suction molds produced by the inventor;

measuring antistatic liquid according to the addition amount in the table 1, and diluting the antistatic liquid according to the dilution ratio of the electrostatic agent, isopropanol and water, wherein the volume ratio of the electrostatic agent to the isopropanol to the water is 1: 2; coating the diluted antistatic liquid on the surface of the sheet base layer by a coating machine; and then, the sheet is sent into an oven, baked for 10s at 70 ℃, cooled and formed to form the PET antistatic sheet with a three-layer structure.

Example 3

collecting PET (polyethylene terephthalate) antistatic sheet waste and PET antistatic sheet leftovers generated by processing a blister tray or an electronic part tray in a workshop, and crushing the PET antistatic sheet waste and the PET antistatic sheet leftovers into blocky materials for later use; the PET anti-static sheet broken material contains 91 wt% of PET, 0.83 wt% of carboxylic acid hydrophilic groups, 0.14 wt% of alcohol hydrophilic groups and 0.53 wt% of quaternary ammonium salt hydrophilic groups, and is leftovers and waste materials generated by other batches of PET anti-static suction molds produced by the inventor;

measuring antistatic liquid according to the addition amount in the table 1, and diluting the antistatic liquid according to the dilution ratio of the electrostatic agent, isopropanol and water, wherein the volume ratio of the electrostatic agent to the isopropanol to the water is 1: 2; coating the diluted antistatic liquid on the surface of the sheet base layer by a coating machine; and then, the sheet is sent into an oven, baked for 8s at 90 ℃, cooled and formed to form the PET antistatic sheet with a three-layer structure.

Example 4

collecting PET (polyethylene terephthalate) antistatic sheet waste and PET antistatic sheet leftovers generated by processing a blister tray or an electronic part tray in a workshop, and crushing the PET antistatic sheet waste and the PET antistatic sheet leftovers into blocky materials for later use; the PET anti-static sheet broken material contains 90 wt% of PET, 0.84 wt% of carboxylic acid hydrophilic groups, 0.16 wt% of alcohol hydrophilic groups and 0.52 wt% of quaternary ammonium salt hydrophilic groups, and is leftovers and waste materials generated by other batches of PET anti-static suction molds produced by the inventor;

measuring antistatic liquid according to the addition amount in the table 1, and diluting the antistatic liquid according to the dilution ratio of the electrostatic agent, isopropanol and water, wherein the volume ratio of the electrostatic agent to the isopropanol to the water is 1: 2; coating the diluted antistatic liquid on the surface of the sheet base layer by a coating machine; and then, the sheet is sent into an oven, baked for 7s at the temperature of 100 ℃, and cooled and formed to form the PET antistatic sheet with a three-layer structure.

Example 5

The PET antistatic sheet of example 5 was identical to the processing operation of example 3 except that: the raw materials and their contents of the sheet base layer were as shown in Table 1, and the PET antistatic sheet crushed material contained 94 wt% of PET, 0.80 wt% of carboxylic acid-based hydrophilic group, 0.19 wt% of alcohol-based hydrophilic group, and 0.50 wt% of quaternary ammonium salt-based hydrophilic group, and the rest was the same as in example 3.

Example 6

The PET antistatic sheet of example 6 was identical to the processing operation of example 3 except that: the raw materials and their contents of the sheet base layer were as shown in Table 1, and the PET antistatic sheet crushed material contained 97wt% of PET, 0.80 wt% of carboxylic acid-based hydrophilic group, 0.13 wt% of alcohol-based hydrophilic group, and 0.51 wt% of quaternary ammonium salt-based hydrophilic group, and the rest was the same as in example 3.

Example 7

The PET antistatic sheet of example 7 was identical to the processing operation of example 3 except that: the raw materials and their contents of the sheet base layer were added as shown in table 1, and the rest was exactly the same as in example 3.

Example 8

The PET antistatic sheet of example 8 was identical to the processing operation of example 3 except that: the raw materials and their contents of the sheet base layer were added as shown in table 1, and the rest was exactly the same as in example 3.

TABLE 1 raw Material composition and content (unit/kg) of PET antistatic sheet in examples 1 to 8

	PET antistatic sheet crushing material	PET particles	Whitening agent	Antistatic liquid
					Example 1	70	30	0.1	5
Example 2	70	30	0.1	5
					Example 3	70	30	0.1	5
Example 4	70	30	0.1	5
					Example 5	72	28	0.15	4
Example 6	75	25	0.24	3
					Example 7	78	22	0.3	2
Example 8	80	20	0.5	1

Example 9

The PET antistatic sheet of example 9 was identical to the processing operation of example 1 except that: the raw materials and their contents of the sheet base layer were added as shown in table 2, and the rest was the same as in example 1.

Example 10

The PET antistatic sheet of example 10 was identical to the processing operation of example 2 except that: the raw materials and their contents of the sheet base layer were added as shown in table 2, and the rest was the same as in example 2.

Example 11

The PET antistatic sheet of example 11 was identical to the processing operation of example 3 except that: the raw materials and their contents of the sheet base layer were added as shown in table 2, and the rest was the same as in example 3.

Example 12

The PET antistatic sheet of example 12 was identical to the processing operation of example 4 except that: the raw materials and their contents of the sheet base layer were added as shown in table 2, and the rest was the same as in example 4.

Example 13

The PET antistatic sheet of example 13 was identical to the processing operation of example 11 except that: the raw materials and their contents of the sheet base layer were added as shown in table 2, and the rest was the same as in example 11.

Example 14

The PET antistatic sheet of example 14 was identical to the processing operation of example 11 except that: the raw materials and their contents of the sheet base layer were added as shown in table 2, and the rest was the same as in example 11.

Example 15

The PET antistatic sheet of example 15 was identical to the processing operation of example 11 except that: the raw materials and their contents of the sheet base layer were added as shown in table 2, and the rest was the same as in example 11.

Example 16

The PET antistatic sheet of example 16 was identical to the processing operation of example 11 except that: the raw materials and their contents of the sheet base layer were added as shown in table 2, and the rest was the same as in example 11.

TABLE 2 raw material composition and content (unit/kg) of PET antistatic sheet in examples 9 to 16

	PET antistatic sheet crushing material	PET particles	Color master batch	Antistatic liquid
					Example 9	70	30	0.5	2
Example 10	70	30	0.5	2
					Example 11	70	30	0.5	2
Example 12	70	30	0.5	2
					Example 13	73	27	1	1.5
Example 14	74.5	25.5	2.8	1
					Example 15	77	23	5	0.8
Example 16	80	20	8	0.5

The PET antistatic sheet can be processed to a thickness of 0.5-1.5mm according to the requirements of plastic trays or electronic part trays which need to be processed actually.

Comparative example 1

The PET antistatic sheet of comparative example 1, which is different from example 6, is: no PET antistatic sheet broken material recovery and breaking operation exists in the processing operation, PET antistatic sheet broken material is replaced by PET particles in the sheet base material, and the addition amount of other raw materials are shown in Table 3.

Comparative example 2

The PET antistatic sheet of comparative example 2, which is different from example 6, is: no PET antistatic sheet broken material recovery and breaking operation exists in the processing operation, PET antistatic sheet broken material is replaced by PET particles in the sheet base material, and the addition amount of other raw materials are shown in Table 3.

Comparative example 3

The PET antistatic sheet of comparative example 3, which is different from example 6 in the processing operation, specifically: according to the raw materials and the addition amount of the raw materials in the example 6, the sheet coated with the antistatic liquid is sent into an oven, baked for 20s at 90 ℃, and cooled and formed to form the PET antistatic sheet with a three-layer structure.

Comparative example 4

The PET antistatic sheet of comparative example 4, which is different from example 6 in the processing operation, specifically: according to the raw materials and the addition amount thereof in example 6, the sheet coated with the antistatic liquid was put into an oven, baked at 90 ℃ for 3 seconds, and cooled to form a PET antistatic sheet having a three-layer structure.

Comparative example 5

The PET antistatic sheet of comparative example 5, which is different from example 14, is: no PET antistatic sheet broken material recovery and breaking operation exists in the processing operation, PET antistatic sheet broken material is replaced by PET particles in the sheet base material, and the addition amount of other raw materials are shown in Table 3.

Comparative example 6

The PET antistatic sheet of comparative example 6, which is different from example 14, is: no PET antistatic sheet broken material recovery and breaking operation exists in the processing operation, PET antistatic sheet broken material is replaced by PET particles in the sheet base material, and the addition amount of other raw materials are shown in Table 3.

Comparative example 7

The PET antistatic sheet of comparative example 7, which is different from example 14 in the processing operation, specifically: the antistatic liquid-coated sheet was fed into an oven according to the raw material and the amount added in example 14, baked at 90 ℃ for 20 seconds, and cooled to form a three-layer structure PET antistatic sheet.

Comparative example 8

The PET antistatic sheet of comparative example 8, which is different from example 14 in the processing operation, specifically: the antistatic liquid-coated sheet was fed into an oven according to the raw material and the amount added in example 14, baked at 90 ℃ for 3 seconds, and cooled to form a three-layer structure PET antistatic sheet.

TABLE 3 raw material composition and content (unit/kg) of PET antistatic sheets in comparative examples 1 to 8

	PET antistatic sheet crushing material	PET particles	Whitening agent	Color master batch	Antistatic liquid
						Comparative example 1	0	100	0.24	0	3
Comparative example 2	0	97.75	0.24	0	4.1
						Comparative example 3	75	25	0.24	0	3
Comparative example 4	75	25	0.24	0	3
						Comparative example 5	0	100	0	2.8	1
Comparative example 6	0	97.8	0	2.8	2.1
						Comparative example 7	74.5	25.5	0	2.8	1
Comparative example 8	74.5	25.5	0	2.8	1

Application example 1

The PET antistatic sheet processed in the embodiment 6 of the present invention is hung on a forming machine in a roll form, and is sent into an electric furnace by a tractor and is baked and formed by matching with a copper mold (the operation of this part is a conventional means of a blister tray and an electronic part tray forming process, and details are not described here), and finally, a white transparent blister tray and an electronic part tray are obtained.

Application example 2

The PET antistatic sheet processed in embodiment 14 of the present invention is hung on a forming machine in a roll form, and is sent into an electric furnace by a tractor and is baked and formed by a copper mold (the operation of this part is a conventional means of a blister tray and an electronic part tray forming process, and details are not described here), and finally, a color transparent blister tray and an electronic part tray are obtained.

Effect example 1

The PET antistatic sheets of examples 1 to 16 and comparative examples 1 to 8 were subjected to the performance measurement by the following test standards and methods, and the test results are shown in table 4: detecting the surface resistance by adopting the detection standard and the detection method of GB/T1410-2006; detecting the tensile strength by adopting the detection standard and the detection method of ASTM D638, wherein the type of the sample is type I; detecting the impact strength by using a detection standard and a detection method of GB/T9639.1-2008; and (3) measuring the wear rate by using a wear testing machine, wherein the impact linear velocity of the sample is 1.8m/s, and the testing time is 1 h.

TABLE 4 results of examining the performances of the PET antistatic sheets of examples 1 to 16 and comparative examples 1 to 8

	Surface resistance/omega	Tensile strength/MPa	Impact strength/(J/m)	Wear rate (mm)³/(N*m))
					Example 1	3×10⁷	52.5	62	11.0
Example 2	4×10⁷	53.0	63	10.9
					Example 3	3×10⁷	54.1	65	10.8
Example 4	4×10⁷	57.3	62	10.9
					Example 5	2×10⁷	59.6	67	10.5
Example 6	9×10⁶	64.0	74	10.1
					Example 7	1×10⁷	64.1	73	10.3
Example 8	2×10⁷	57.3	76	10.2
					Example 9	3×10⁷	53.4	65	10.8
Example 10	3×10⁷	54.1	64	10.8
					Example 11	2×10⁷	55.0	65	10.7
Example 12	3×10⁷	54.6	65	10.7
					Example 13	1×10⁷	59.3	69	10.5
Example 14	7×10⁶	65.7	77	10.0
					Example 15	9×10⁶	65.5	77	10.1
Example 16	1×10⁷	63.8	75	10.2
					Comparative example 1	1×10⁸	54.3	70	11.3
Comparative example 2	9×10⁷	54.6	72	11.0
					Comparative example 3	1×10⁷	43.0	53	12.0
Comparative example 4	2×10⁷	50.7	55	11.5
					Comparative example 5	2×10⁸	55.0	74	11.2
Comparative example 6	8×10⁷	55.8	75	10.8
					Comparative example 7	9×10⁶	46.1	58	11.7
Comparative example 8	8×10⁶	52.4	60	11.4

As shown in Table 4, the PET antistatic sheet of the present invention had a surface resistance of 10⁶The lowest can reach 7 multiplied by 10⁶The antistatic performance is excellent; the tensile strength of the material can reach 65.7MPa, the impact strength can reach 77J/m, and the wear rate is 10.0mm³And (N × m), when applied to an electronic component tray or a blister tray, the support can stably support electronic products such as electronic components. From the test results of comparative example 1 and comparative example 2, if no broken material of the PET antistatic sheet is added, the PET antistatic sheet is prepared by matching the PET particles with the toner and the antistatic liquid, the mechanical property and the wear resistance of the obtained PET antistatic sheet are less affected, but the antistatic property is greatly affected, and the surface resistance value is increased by one order of magnitude, namely, the antistatic property is reduced. From the test results of comparative examples 3 and 4, it is understood that the baking time after the antistatic liquid was applied to form the sheet has a small influence on the final antistatic property of the sheet, but has a large influence on the impact strength and tensile strength of the sheet.

Effect example 2

The PET antistatic sheets of examples 1 to 16 of the present invention and comparative examples 1 to 8 were cut into square plate samples of 10cm X10 cm, and three sets of samples were prepared for each example or comparative example. Placing a stainless steel net rack in a constant temperature and humidity box with the temperature of 60 ℃, the relative humidity of 15% and the oxygen content of 30%, placing each sample on the net rack to enable the sample to stand and suspend for 30 days, and continuously irradiating the sample from the upper part and the lower part of the sample by using ultraviolet light; the performance of the samples of each example or comparative example was measured according to the measurement method and standard of effect example 1, and the average value of the three groups of samples of each example or comparative example was taken as the measurement result of the PET antistatic sheet of the example or comparative example, which is shown in table 5.

TABLE 5 results of examining the properties of the treated PET antistatic sheets of examples 1 to 16 and comparative examples 1 to 8

	Surface resistance/omega	Tensile strength/MPa	Impact strength/(J/m)	Wear rate (mm)³/(N*m))
					Example 1	4×10⁷	50.3	58	11.2
Example 2	4×10⁷	51.1	58	10.9
					Example 3	3×10⁷	51.8	60	10.9
Example 4	4×10⁷	54.0	59	10.9
					Example 5	2×10⁷	56.8	64	10.5
Example 6	9×10⁶	60.0	70	10.2
					Example 7	2×10⁷	60.0	70	10.4
Example 8	3×10⁷	53.2	72	10.4
					Example 9	3×10⁷	50.2	60	10.9
Example 10	4×10⁷	50.1	62	11.0
					Example 11	3×10⁷	53.7	61	10.7
Example 12	4×10⁷	51.2	62	10.8
					Example 13	2×10⁷	57.0	64	10.5
Example 14	8×10⁶	63.4	74	10.0
					Example 15	9×10⁶	62.5	73	10.2
Example 16	1×10⁷	61.9	71	10.2
					Comparative example 1	4×10⁸	50.0	64	12.5
Comparative example 2	3×10⁸	50.2	63	12.1
					Comparative example 3	2×10⁷	40.0	45	11.8
Comparative example 4	8×10⁷	47.8	47	11.7
					Comparative example 5	6×10⁸	50.0	64	12.6
Comparative example 6	2×10⁸	51.5	65	12.4
					Comparative example 7	1×10⁷	41.4	50	11.7
Comparative example 8	7×10⁷	47.6	50	11.5

As can be seen from table 5, the antistatic PET sheet of the present invention has stable antistatic performance, is less affected by ambient temperature, humidity, oxygen content and friction, has basically unchanged surface resistance and less changes in tensile strength, abrasion resistance and the like even when stored in a severe environment for 30 days, and proves that the antistatic PET sheet of the present invention has good durability. The PET antistatic sheet has the advantages of antistatic durability of a blending method and low antistatic agent addition amount and quick response of a coating method due to the fact that the middle layer (sheet base layer) contains the antistatic component, and long-term tests prove that the PET antistatic sheet can be normally used for two to three years under the condition of keeping better antistatic performance.

In addition, in example 6 of the present invention, 75kg of crushed PET antistatic sheet, 25kg of PET pellets, 0.24kg of whitening agent and 3kg of antistatic liquid were added, as calculated in comparative example 2 and example 6. In comparative example 2, 97.75kg of PET pellets, 0.24kg of brightener and 4.1kg of antistatic liquid were added. Compared with the traditional process, the embodiment 6 saves about 73kg of PET particles, 1.1kg of antistatic liquid and production cost, but the antistatic performance of the obtained PET antistatic sheet is not worse than that of the traditional process. By taking comparative example 6 and example 14 as examples, in example 14 of the present invention, 74.5kg of PET antistatic sheet crumbs, 25.5kg of PET pellets, 2.8kg of color masterbatch and 1kg of antistatic liquid were added. In comparative example 6, 97.8kg of PET pellets, 2.8kg of color master batch and 2.1kg of antistatic liquid were added. Compared with the traditional process, the method saves about 72kg of PET granules, 1.1kg of antistatic liquid and production cost.

The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.

Claims

1. The PET antistatic sheet is characterized in that: the antistatic coating comprises a sheet base layer and an antistatic layer formed by coating antistatic liquid on the surface of the sheet base layer, wherein the sheet base layer is prepared from the following raw materials in parts by weight: 70-80 parts of PET (polyethylene terephthalate) anti-static sheet material broken material, 20-30 parts of PET particles and 0.1-0.5 part of brightening agent, wherein the PET anti-static sheet material broken material contains 90-97wt% of PET; the total weight of the antistatic layer is 1-5% of the total weight of the sheet base layer; the PET antistatic sheet is obtained by processing the following operation steps: preprocessing a PET anti-static sheet material crushing material; mixing the PET antistatic sheet crushed material and other raw materials of the sheet base layer according to the weight parts, and carrying out melt extrusion molding to obtain the sheet base layer; coating antistatic liquid on the surface of a sheet base layer, baking for 7-10s at 70-100 ℃, and cooling and forming to form a PET antistatic sheet; wherein, when the antistatic liquid is coated, the antistatic liquid is coated after being diluted according to the dilution ratio of the electrostatic agent, the isopropanol and the water, wherein the volume ratio of the electrostatic agent to the isopropanol to the water is 1: 2.

2. The PET antistatic sheet according to claim 1, wherein: the sheet base layer is prepared from the following raw materials in parts by weight: 72-78 parts of PET antistatic sheet broken material, 22-28 parts of PET particles and 0.15-0.3 part of whitening agent.

3. The PET antistatic sheet is characterized in that: the antistatic coating comprises a sheet base layer and an antistatic layer formed by coating antistatic liquid on the surface of the sheet base layer, wherein the sheet base layer is prepared from the following raw materials in parts by weight: 70-80 parts of PET anti-static sheet material, 20-30 parts of PET particles and 0.5-8 parts of color master batch, wherein the PET anti-static sheet material contains 85-95wt% of PET; the total weight of the antistatic layer is 0.46-2.0% of the total weight of the sheet base layer; the PET antistatic sheet is obtained by processing the following operation steps: preprocessing a PET anti-static sheet material crushing material; mixing the PET antistatic sheet crushed material and other raw materials of the sheet base layer according to the weight parts, and carrying out melt extrusion molding to obtain the sheet base layer; coating antistatic liquid on the surface of a sheet base layer, baking for 7-10s at 70-100 ℃, and cooling and forming to form a PET antistatic sheet; wherein, when the antistatic liquid is coated, the antistatic liquid is coated after being diluted according to the dilution ratio of the electrostatic agent, the isopropanol and the water, wherein the volume ratio of the electrostatic agent to the isopropanol to the water is 1: 2.

4. The PET antistatic sheet according to claim 3, wherein: the sheet base layer is prepared from the following raw materials in parts by weight: 73-77 parts of PET antistatic sheet broken material, 23-27 parts of PET particles and 1-5 parts of color master batch.

5. A process for preparing the PET antistatic sheet according to any one of claims 1 to 4, which comprises the following steps:

preprocessing a PET anti-static sheet material crushing material;

6. The process for processing the PET antistatic sheet according to claim 5, wherein: the PET anti-static sheet broken material is selected from leftovers generated in the process of processing a plastic sucking tray and an electronic part tray.

7. The process for processing the PET antistatic sheet according to claim 5, wherein: the baking operation temperature is 70-100 ℃, and the baking time is 7-10 s.

8. Use of the PET antistatic sheet according to any one of claims 1 to 4, wherein: the PET antistatic sheet is used for processing a plastic sucking tray and an electronic part tray.