Production process of antistatic sheet

Abstract

The invention relates to a production process of an antistatic sheet, and belongs to the technical field of antistatic sheets. The preparation method comprises the following steps: drying, stirring and uniformly mixing high impact polystyrene, a toughening material, a conductive filler and toner; continuously adding an antistatic agent and an antioxidant, uniformly mixing, extruding a sheet by using a single screw, and calendering into a sheet by using a three-roller calender to obtain an antistatic sheet; the antistatic agent disclosed by the invention is prepared from N-allyl pyridine tetrafluoroborate, 11-mercapto undecane-N, N, N-trimethyl ammonium bromide, allyl phenyl selenium, triethylamine and methylbenzene. The anti-static sheet prepared by the preparation method has the advantages that the surface resistivity is high, and the anti-static performance is good; meanwhile, the prepared antistatic sheet is high in tensile yield strength and excellent in mechanical property.

Description

Technical Field

[0001] The invention relates to the technical field of antistatic sheets, in particular to a production process of antistatic sheets. Background Art

[0002] With the rapid development of science and technology, the electronics industry has achieved unprecedented leaps. The rapid development of this industry has driven the packaging of electronic products. The packaging of some functional electronic products that can display the function and appearance of products is increasingly showing great vitality and importance. At the same time, the development of this industry has also put forward higher requirements for packaging. Some functional packaging materials with high antistatic properties and permanent antistatic properties have come into being.

[0003] Chinese patent CN1659228A: provides a resin composition, which contains 60-85% by weight of polystyrene resin and 15-40% by weight of polyether ester amide. The polystyrene resin is a copolymer containing styrene monomer and methyl (meth)acrylate monomer.

[0004] Chinese patent CN1508180A discloses a polystyrene highly transparent antistatic sheet, characterized in that it adopts the following formula (by weight, based on 100 parts): polystyrene 80-95, antistatic material glycerol monolipid 3-15, ethoxylated amine 2-10. The antistatic material glycerol monolipid is selected from antistatic material glycerol monolipid with acid value ≤3.0mgkoh / g, free glycerol ≤1%, moisture ≤0.5w / w, and iodine value ≤2, and the ethoxylated amine is selected from tertiary amine ≥95%w / w, neutralization equivalent 293-307, moisture ≤0.5w / w, primary amine and secondary amine ≤2%w / w.

[0005] Chinese Patent CN102712165A: Provides an antistatic sheet for laminating beverage and food containers and a method for manufacturing the same. The antistatic sheet of the present invention has an insulator film, an embossed layer formed on at least one surface of the insulator film, and an antistatic layer formed on one surface of the embossed layer. The method for manufacturing the antistatic sheet of the present invention comprises: a manufacturing step of the insulator film, extruding an olefin polymer and forming a film; a forming step of the embossed layer, passing the insulator film through an embossing roller to form an embossed layer on at least one surface of the insulator film; and a forming step of the antistatic layer, coating an antistatic composition on at least one surface of the embossed layer and thermally curing or photocuring to form an antistatic layer.

[0006] The antistatic sheets prepared by the above patents and prior art do not have a permanent antistatic effect and the antistatic effect is unstable. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a production process of an antistatic sheet, and the operation steps are as follows:

[0008] S1: According to weight, 80-100 parts of high impact polystyrene, 30-40 parts of toughening material, 5-10 parts of conductive filler, and 5-10 parts of color powder are dried and stirred to mix evenly;

[0009] S2: Continue to add 1-3 parts of antistatic agent and 0.1-1 parts of antioxidant, mix well, extrude sheet through single screw, and then calender through three-roll calender to obtain antistatic sheet.

[0010] The toughening material is one of styrene-butadiene rubber, butadiene rubber, ethylene-octene copolymer, polyolefin elastomer, ethylene-propylene-diene terpolymer, and styrene-butadiene-styrene block copolymer.

[0011] The conductive filler is one of graphite, acetylene conductive carbon black, furnace conductive carbon black, carbon nanotube and graphene.

[0012] The antioxidant is one of antioxidant 1010, antioxidant 168 and antioxidant 1098.

[0013] The extrusion temperature is 180-220°C.

[0014] The thickness of the antistatic sheet is 0.8-1 mm.

[0015] The preparation method of the antistatic agent is:

[0016] Weigh 20-40 parts of N-allylpyridinium tetrafluoroborate (CAS No.: 2707-80-4), 48-96 parts of 11-mercaptoundecane-N,N,N-trimethylammonium bromide (CAS No.: 197587-43-2), 0.03-0.3 parts of allylphenylselenium (CAS No.: 14370-82-2), 2-5 parts of triethylamine, and 200-300 parts of toluene by weight, and continue stirring at 80-90° C. for 120-180 minutes; after the reaction is completed, remove the toluene by reduced pressure distillation to obtain an antistatic agent.

[0017] Reaction mechanism

[0018] In the thiol-allyl Michael addition reaction, the thiol (-SH) in 11-mercaptoundecane-N,N,N-trimethylammonium bromide acts as a nucleophile to attack the allyl double bond (C=C) in N-allylpyridinium tetrafluoroborate to form a new carbon-sulfur bond (CS). At the same time, the allyl group in allylphenylselenide may also participate in similar reactions, further increasing the complexity and functionality of the product.

[0019] The quaternary ammonium salt antistatic agent grafted with tetrafluoroborate and phenylselenium generated by the reaction contains multiple functional groups in its molecular structure, including tetrafluoroborate anion, quaternary ammonium salt cation and possible phenylselenium part. These functional groups are connected together by chemical bonds to form a polymer compound with specific functions.

[0020] Technical Effects

[0021] The production process of an antistatic sheet of the present invention has the following significant effects compared with the prior art:

[0022] 1. Antistatic performance: The generated quaternary ammonium salt antistatic agent of grafted tetrafluoroborate and phenyl selenium has excellent antistatic performance; this is mainly attributed to the conductive functional groups such as tetrafluoroborate anions and quaternary ammonium salt cations contained in its molecular structure; these functional groups can effectively reduce the surface resistivity of the material, thereby preventing static electricity accumulation and discharge.

[0023] 2. Static isolation mechanism: In antistatic sheets, these conductive functional groups may form a conductive network or channel, allowing static charges to be quickly dispersed and transferred within the material; at the same time, longer alkyl chains and other non-conductive parts may play a certain barrier role, preventing static charges from leaking to the outside or discharging when in contact with other objects. DETAILED DESCRIPTION

[0024] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description in combination with embodiments and comparative examples:

[0025] 1. Tensile yield strength test: Measured using BT20KN universal tensile testing machine.

[0026] 2. Surface resistivity test: Refer to GB / T1410-2006 and use a high resistance meter for measurement.

[0027] Example 1

[0028] A production process of an antistatic sheet, the operating steps of which are:

[0029] S1: 80g high impact polystyrene, 30g toughening material, 5g conductive filler, and 5g color powder were dried and stirred to mix evenly;

[0030] S2: Continue to add 1g of antistatic agent and 0.1g of antioxidant, mix well, extrude the sheet through a single screw, and then calender it through a three-roll calender to obtain an antistatic sheet.

[0031] The toughening material is styrene-butadiene rubber.

[0032] The conductive filler is graphite.

[0033] The antioxidant is antioxidant 1010.

[0034] The extrusion temperature is 180°C.

[0035] The thickness of the antistatic sheet is 0.8 mm.

[0036] The preparation method of the antistatic agent is:

[0037] Weigh 20g N-allylpyridinium tetrafluoroborate CAS No.: 2707-80-4, 48g 11-mercaptoundecane-N,N,N-trimethylammonium bromide CAS No.: 197587-43-2, 0.03g allylphenylselenium CAS No.: 14370-82-2, 2g triethylamine, and 200g toluene, and continue stirring at 80°C for 120 minutes; after the reaction is completed, remove the toluene by reduced pressure distillation to obtain an antistatic agent.

[0038] Example 2

[0039] A production process of an antistatic sheet, the operating steps of which are:

[0040] S1: 85g high impact polystyrene, 33g toughening material, 6g conductive filler, and 6g color powder were dried and stirred to mix evenly;

[0041] S2: Continue to add 2g of antistatic agent and 0.5g of antioxidant, mix well, extrude into sheets through a single screw extruder, and then calender into sheets through a three-roll calender to obtain an antistatic sheet.

[0042] The toughening material is butadiene rubber.

[0043] The conductive filler is acetylene conductive carbon black.

[0044] The antioxidant is antioxidant 168.

[0045] The extrusion temperature is 190°C.

[0046] The thickness of the antistatic sheet is 0.9 mm.

[0047] The preparation method of the antistatic agent is:

[0048] Weigh 25g of N-allylpyridinium tetrafluoroborate CAS No.: 2707-80-4, 60g of 11-mercaptoundecane-N,N,N-trimethylammonium bromide CAS No.: 197587-43-2, 0.1g of allylphenylselenium CAS No.: 14370-82-2, 3g of triethylamine, and 240g of toluene, and continue stirring at 85°C for 140 minutes; after the reaction is completed, remove the toluene by reduced pressure distillation to obtain an antistatic agent.

[0049] Example 3

[0050] A production process of an antistatic sheet, the operating steps of which are:

[0051] S1: 95g high impact polystyrene, 38g toughening material, 8g conductive filler, and 8g color powder were dried and stirred to mix evenly;

[0052] S2: Continue to add 2g of antistatic agent and 0.8g of antioxidant, mix well, extrude into sheets through a single screw extruder, and then calender into sheets through a three-roll calender to obtain an antistatic sheet.

[0053] The toughening material is ethylene-octene copolymer.

[0054] The conductive filler is furnace conductive carbon black.

[0055] The antioxidant is antioxidant 168.

[0056] The extrusion temperature is 210°C.

[0057] The thickness of the antistatic sheet is 0.9 mm.

[0058] The preparation method of the antistatic agent is:

[0059] Weigh 35g N-allylpyridinium tetrafluoroborate CAS No.: 2707-80-4, 80g 11-mercaptoundecane-N,N,N-trimethylammonium bromide CAS No.: 197587-43-2, 0.2g allylphenylselenium CAS No.: 14370-82-2, 4g triethylamine, 280g toluene, and continue stirring at 85°C for 160 minutes; after the reaction is completed, remove the toluene by reduced pressure distillation to obtain an antistatic agent.

[0060] Example 4

[0061] A production process of an antistatic sheet, the operating steps of which are:

[0062] S1: 100g high impact polystyrene, 40g toughening material, 10g conductive filler, and 10g color powder are dried and stirred to mix evenly;

[0063] S2: Continue to add 3g of antistatic agent and 1g of antioxidant, mix well, extrude the sheet through a single screw, and then calender it through a three-roll calender to obtain an antistatic sheet.

[0064] The toughening material is ethylene-propylene-diene terpolymer.

[0065] The conductive filler is carbon nanotube.

[0066] The antioxidant is antioxidant 1098.

[0067] The extrusion temperature is 220°C.

[0068] The thickness of the antistatic sheet is 1 mm.

[0069] The preparation method of the antistatic agent is:

[0070] Weigh 40g N-allylpyridinium tetrafluoroborate CAS No.: 2707-80-4, 96g 11-mercaptoundecane-N,N,N-trimethylammonium bromide CAS No.: 197587-43-2, 0.3g allylphenylselenium CAS No.: 14370-82-2, 5g triethylamine, and 300g toluene, and continue stirring at 90°C for 180 minutes; after the reaction is completed, remove the toluene by reduced pressure distillation to obtain an antistatic agent.

[0071] Comparative Example 1

[0072] No antistatic agent was added, and the rest was the same as in Example 1.

[0073] Comparative Example 2

[0074] The other steps were the same as in Example 1 except that N-allylpyridinium tetrafluoroborate was not added.

[0075] Comparative Example 3

[0076] Allylphenylselenium was not added, and the other steps were the same as in Example 1.

[0077] Table 1 shows the test results of the embodiments and comparative examples.

[0078] Table 1

[0079]

[0080]

[0081] Through the data analysis of the above embodiments and comparative examples, the antistatic sheet prepared by the present invention has a good antistatic performance in terms of surface resistivity; at the same time, the antistatic sheet prepared by the present invention has a high tensile yield strength and excellent mechanical properties.

[0082] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A production process for antistatic sheets, the operating steps of which are: S1: According to weight, 80-100 parts of high impact polystyrene, 30-40 parts of toughening material, 5-10 parts of conductive filler, and 5-10 parts of color powder are dried and stirred to mix evenly; S2: Continue to add 1-3 parts of antistatic agent and 0.1-1 parts of antioxidant, mix well, extrude the sheet through a single screw, and then calender it through a three-roll calender to obtain an antistatic sheet; The antistatic agent is prepared by reacting N-allylpyridinium tetrafluoroborate, 11-mercaptoundecane-N,N,N-trimethylammonium bromide and allylphenylselenium.

2. The production process of an antistatic sheet according to claim 1, characterized in that: The toughening material is one of styrene-butadiene rubber, butadiene rubber, ethylene-octene copolymer, polyolefin elastomer, ethylene-propylene-diene terpolymer, and styrene-butadiene-styrene block copolymer.

3. The production process of an antistatic sheet according to claim 1, characterized in that: The conductive filler is one of graphite, acetylene conductive carbon black, furnace conductive carbon black, carbon nanotube and graphene.

4. The production process of an antistatic sheet according to claim 1, characterized in that: The antioxidant is one of antioxidant 1010, antioxidant 168 and antioxidant 1098.

5. The production process of an antistatic sheet according to claim 1, characterized in that: The extrusion temperature is 180-220°C.

6. The production process of an antistatic sheet according to claim 1, characterized in that: The thickness of the antistatic sheet is 0.8-1 mm.

7. The production process of an antistatic sheet according to claim 1, characterized in that: The preparation method of the antistatic agent is: Weigh 20-40 parts of N-allylpyridinium tetrafluoroborate, 48-96 parts of 11-mercaptoundecane-N,N,N-trimethylammonium bromide, 0.03-0.3 parts of allylphenylselenium, 2-5 parts of triethylamine, and 200-300 parts of toluene by weight, and continue stirring at 80-90° C. for 120-180 minutes; after the reaction is completed, remove the toluene by reduced pressure distillation to obtain an antistatic agent.

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