CN111574678A - Anti-static polyurethane foam base material, preparation method thereof and adhesive tape - Google Patents
Anti-static polyurethane foam base material, preparation method thereof and adhesive tape Download PDFInfo
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- CN111574678A CN111574678A CN202010494465.2A CN202010494465A CN111574678A CN 111574678 A CN111574678 A CN 111574678A CN 202010494465 A CN202010494465 A CN 202010494465A CN 111574678 A CN111574678 A CN 111574678A
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
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- C09J2400/00—Presence of inorganic and organic materials
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Abstract
The invention provides an anti-static polyurethane foam base material, a preparation method thereof and an adhesive tape. The polyurethane foam substrate comprises a component A, a component B and a component C, wherein the component A is diphenylmethane diisocyanate, the component B is a mixture of aqueous graphene dispersion, acetylene black, silicon dioxide dispersion emulsion and an adhesive, and the component C is a mixture of a polyol composition, a flame retardant, a catalyst, nano-mineral crystals with the particle size of 30-50 nm, a foam stabilizer, a chain extender and water. The polyurethane foam substrate prepared by the invention has the conductive film on the surface, has good antistatic performance, and can be applied to the packaging of electronic products.
Description
Technical Field
The invention relates to the technical field of polyurethane foam, in particular to an anti-static polyurethane foam base material, a preparation method thereof and an adhesive tape.
Background
The polyurethane foam material is an organic polymer material which is obtained by reacting polyisocyanate and polyol and contains a plurality of urethane chain segments. The polyurethane material has excellent mechanical, acoustic, electrical and chemical medium resistance, wide hardness range, good flexibility, bonding performance, wear resistance, low temperature resistance, radiation resistance and the like. The polyurethane material is widely applied in the fields of automobiles, machinery, electronics, packaging, buildings, medical treatment, aerospace and the like.
The antistatic adhesive tape is a general electronic packaging material, is widely applied to the packaging and manufacturing process of electronic products, can seal an integrated circuit to isolate the external environment, generally has an antistatic function, and can prevent static electricity from damaging the integrated circuit. However, the updating and upgrading of electronic products are particularly fast, a new high-quality mobile phone appears in half a year, and in order to meet the updating and upgrading of the electronic products, a new polyurethane cotton adhesive tape with good antistatic performance needs to be developed.
Disclosure of Invention
The invention provides the novel polyurethane foam base material with good antistatic performance so as to meet the requirements of updating and upgrading of electronic products.
The embodiment of the invention provides an antistatic polyurethane foam base material which comprises a component A, a component B and a component C, wherein the component A is diphenylmethane diisocyanate and accounts for 100 parts by weight; the component B is a mixture of aqueous graphene dispersion liquid, acetylene carbon black, silicon dioxide dispersion emulsion and an adhesive, wherein the aqueous graphene dispersion liquid is 15-30 parts by weight, the acetylene carbon black is 0.5-3 parts by weight, the silicon dioxide dispersion emulsion is 0.2-0.8 part by weight, and the adhesive is 0.5-1 part by weight; the component C is a composite white material and comprises the following components in parts by weight:
80-120 parts of a polyol composition;
30-50 parts of a flame retardant;
2-5 parts of catalyst
20-40 parts of nano mineral crystals with the particle size of 30-50 nm;
5-20 parts of a foam stabilizer;
5-12 parts of a chain extender;
4-8 parts of water.
Optionally, the polyol composition comprises: 10-20 wt% of polyethylene glycol with the average molecular weight of 200-1000; the polyester polyol having a hydroxyl value of 20 to 500 and a functionality of 2 to 3 is 80 to 90 wt%.
Optionally, the flame retardant is ammonium phosphate.
Optionally, the catalyst is an amine catalyst or a tin catalyst.
Optionally, the foam stabilizer is polydimethylsiloxane.
Optionally, the chain extender is one or a combination of 1, 4-butanediol, ethylene glycol, ethylenediamine and diethylenediamine.
Optionally, the binder is selected from one of tetrafluoroethylene resin, polyvinylidene fluoride and styrene-butadiene rubber.
The embodiment of the invention also provides a preparation method of the antistatic polyurethane foam substrate, which comprises the following steps:
the method comprises the following steps: weighing 100 parts of the component A, placing the component A into a container, weighing the aqueous graphene dispersion liquid, the acetylene carbon black, the silicon dioxide dispersion liquid and the adhesive according to the formula weight, and uniformly mixing the components through a high-shear emulsifying machine to obtain the component B;
step two: weighing a polyol composition, a flame retardant, a foaming agent, nano-mineral crystals with the particle size of 30-50 nm, a foam stabilizer, a chain extender and water according to the formula weight, and uniformly stirring to obtain a component C;
step three: pouring the component C into a mold, wherein the side wall of the mold is provided with a plurality of uniformly distributed through holes, and the through holes are connected with a container for containing the component A through a pipeline;
step four: coating the component B in the step one on the surface of the component C, and then introducing the component A into the component C through the through holes for foaming to obtain a polyurethane foam body;
step five: the polyurethane foam is coated onto a release film or permanent support film or other carrier, treated to a uniform thickness, and dried to form a polyurethane substrate.
Optionally, the component B forms a lattice structure on the surface of the polyurethane foam, and the lattice structure can be elongated by stretching under pressure.
The embodiment of the invention also provides an adhesive tape, which comprises a polyurethane cotton base material, an adhesive layer and a release film, wherein the polyurethane cotton base material is prepared by adopting the preparation method of the anti-static polyurethane cotton base material.
The invention has the following beneficial effects:
1. according to the invention, the component B consisting of the aqueous graphene dispersion liquid, the acetylene carbon black, the silicon dioxide dispersion emulsion and the adhesive is coated on the surface of the component C, and the component C is molded into a grid structure under the pressure of gas generated by a foaming reaction, wherein the grid structure has an antistatic effect.
2. The polyalcohol of the combined white material comprises polyethylene glycol with the average molecular weight of 200-1000, and the excellent capacity of absorbing bound water is utilized, so that the antistatic effect is further improved.
3. According to the invention, the nano-mineral crystals are added into the combined white material for preparing the antistatic polyurethane foam base material, on the one hand, the nano-pores of the nano-mineral crystals can delay the release speed of gas, so that the foaming speed is reduced, the foaming time is prolonged, the foaming reaction is more sufficient, meanwhile, the subsequent forming operation is facilitated, and the thickness of the polyurethane film obtained by treatment is more uniform; in the second aspect, the nano pores of the nano mineral crystals can divide the gas generated by the foaming reaction into nano bubbles, so that the pores are more uniform, and the grid structure formed by the component B is more regular; and in the third aspect, the polyurethane foam can adsorb part of volatile amine odor, acetaldehyde and the like generated in the foaming process, and the TVOC amount of the polyurethane foam is reduced, so that the prepared product is more environment-friendly.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an antistatic polyurethane foam base material which comprises a component A, a component B and a component C, wherein the component A is diphenylmethane diisocyanate and accounts for 100 parts by weight; the component B is a mixture of aqueous graphene dispersion liquid, acetylene carbon black, silicon dioxide dispersion emulsion and an adhesive, wherein the aqueous graphene dispersion liquid is 15-30 parts by weight, the acetylene carbon black is 0.5-3 parts by weight, the silicon dioxide dispersion emulsion is 0.2-0.8 part by weight, and the adhesive is 0.5-1 part by weight; the component C is a composite white material and comprises the following components in parts by weight:
80-120 parts of a polyol composition;
30-50 parts of a flame retardant;
2-5 parts of catalyst
20-40 parts of nano mineral crystals with the particle size of 30-50 nm;
5-20 parts of a foam stabilizer;
5-12 parts of a chain extender;
4-8 parts of water.
The conductive adhesive tape is characterized in that the conductive adhesive tape is prepared by uniformly mixing the silicon dioxide and the acetylene carbon black, coating the mixture on the surface of the component C to form a conductive film, wherein when the component A and the component C are subjected to foaming reaction, the film is impacted by pressure formed by generated carbon dioxide gas, so that the film forms a net structure, when a polyurethane foaming body is coated on a release film or a permanent support film or other carriers, the polyurethane foaming body is treated to reach uniform thickness, and the net structure is stretched, so that the conductive film is formed on the surface of the polyurethane film, and the adhesive tape prepared from the polyurethane film has antistatic performance. The added silicon dioxide can form a certain convex state on the surface of the polyurethane film to play a role in preventing adhesion.
Wherein the polyol composition comprises: 10-20% by weight of polyethylene glycol with the average molecular weight of 200-1000; a polyester polyol having a hydroxyl value of 20 to 500 and a functionality of 2 to 3, in an amount of 80 to 90% by weight.
In the embodiment of the invention, the polyol composition comprises polyethylene glycol with the average molecular weight of 200-1000, and the excellent capability of absorbing bound water is utilized, so that the antistatic effect is further improved.
Wherein the flame retardant is ammonium phosphate.
Wherein the catalyst is an amine catalyst or a tin catalyst.
Specifically, the amine catalyst is triethylene diamine, and the tin catalyst is stannous octoate.
Wherein the foam stabilizer is polydimethylsiloxane.
The polydimethylsiloxane can stabilize the foam performance, can also improve the extensibility of polyurethane foam, and is also synergistic in flame retardance.
The chain extender is one or a composition of more of 1, 4-butanediol, ethylene glycol, ethylenediamine and diethylene diamine.
Wherein the adhesive is selected from one of tetrafluoroethylene resin, polyvinylidene fluoride and styrene-butadiene rubber.
According to the invention, the nano-mineral crystals are added into the combined white material for preparing the antistatic polyurethane foam base material, on the one hand, the nano-pores of the nano-mineral crystals can delay the release speed of gas, so that the foaming speed is reduced, the foaming time is prolonged, the foaming reaction is more sufficient, meanwhile, the subsequent forming operation is facilitated, and the thickness of the polyurethane film obtained by treatment is more uniform; in a second aspect, the nanopores of the first nano-mineral crystal can divide gas generated by a foaming reaction into nanobubbles, so that the cells are more uniform, and a grid structure formed by the component B is more regular; and in the third aspect, the polyurethane foam can adsorb part of volatile amine odor, acetaldehyde and the like generated in the foaming process, and the TVOC amount of the polyurethane foam is reduced, so that the prepared product is more environment-friendly.
The particle size of the nano mineral crystal is preferably 30-50 nm, and when the particle size of the nano mineral crystal is less than 30nm, the foaming speed can be influenced, so that the gel reaction is too fast, and the foaming system cannot be expanded completely to influence the foaming height; when the particle size of the nano mineral crystal is greater than 50nm, the density of the polyurethane foam is reduced.
Example 1
An antistatic polyurethane foam base material comprises a component A, a component B and a component C, wherein the component A is diphenylmethane diisocyanate and is 100 parts by weight, the component B is a mixture of aqueous graphene dispersion liquid, acetylene carbon black, silicon dioxide dispersion emulsion and an adhesive, the aqueous graphene dispersion liquid is 15 parts by weight, the acetylene carbon black is 3 parts by weight, the silicon dioxide dispersion emulsion is 0.2 part by weight, and the adhesive is 0.8 part by weight; the component C is a composite white material and comprises the following components in parts by weight: 80 parts of a polyol composition (wherein 16 parts of polyethylene glycol with the average molecular weight of 200-1000, 64 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3), 30 parts of a flame retardant, 3 parts of a catalyst (triethylene diamine) and 20 parts of nano-mineral crystals with the particle size of 30-50 nm; the foam stabilizer is 5 parts by weight, the chain extender (ethylene glycol) is 5 parts by weight, and the water is 4 parts by weight.
Placing the component A into a container, uniformly mixing the component B through a high-shear emulsifying machine, uniformly stirring the component C, pouring the component C into a mold, forming a plurality of uniformly distributed through holes in the side wall of the mold, connecting the through holes with a container for containing the component A through a pipeline, coating the component B on the surface of the component C, introducing the component A into the component C through the through holes for foaming to obtain a polyurethane foam body, coating the polyurethane foam body on a release film or a permanent support film or other carriers, treating to reach uniform thickness, and drying to form the polyurethane foam base material. Wherein the foaming time is 20-30 minutes, the foaming temperature is normal temperature, and the thickness of the polyurethane foam base material is 0.1 mm.
Examples 2 to 6 were prepared in the same manner as in example 1, except that the amounts of the components added were different, specifically:
example 2
An antistatic polyurethane foam base material comprises a component A, a component B and a component C, wherein the component A is diphenylmethane diisocyanate and is 100 parts by weight, the component B is a mixture of aqueous graphene dispersion liquid, acetylene carbon black, silicon dioxide dispersion emulsion and an adhesive, the aqueous graphene dispersion liquid is 20 parts by weight, the acetylene carbon black is 2.5 parts by weight, the silicon dioxide dispersion emulsion is 0.4 part by weight, and the adhesive is 0.5 part by weight; the component C is a composite white material and comprises the following components in parts by weight: 100 parts of a polyol composition (wherein 20 parts of polyethylene glycol with the average molecular weight of 200-1000, 80 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3), 40 parts of a flame retardant, 4 parts of a catalyst (triethylene diamine) and 30 parts of nano-mineral crystals with the particle size of 30-50 nm; the foam stabilizer is 10 parts by weight, the chain extender (ethylene glycol) is 7 parts by weight, and the water is 6 parts by weight.
Example 3
An antistatic polyurethane foam base material comprises a component A, a component B and a component C, wherein the component A is diphenylmethane diisocyanate and is 100 parts by weight, the component B is a mixture of aqueous graphene dispersion liquid, acetylene carbon black, silicon dioxide dispersion emulsion and an adhesive, the aqueous graphene dispersion liquid is 25 parts by weight, the acetylene carbon black is 3 parts by weight, the silicon dioxide dispersion emulsion is 0.8 part by weight, and the adhesive is 1 part by weight; the component C is a composite white material and comprises the following components in parts by weight: 120 parts of a polyol composition (wherein 20 parts of polyethylene glycol with the average molecular weight of 200-1000, 100 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3), 50 parts of a flame retardant, 5 parts of a catalyst (triethylene diamine) and 40 parts of nano-mineral crystals with the particle size of 30-50 nm; the foam stabilizer is 15 parts by weight, the chain extender (ethylene glycol) is 10 parts by weight, and the water is 8 parts by weight.
Example 4
An antistatic polyurethane foam base material comprises a component A, a component B and a component C, wherein the component A is diphenylmethane diisocyanate and is 100 parts by weight, the component B is a mixture of aqueous graphene dispersion liquid, acetylene carbon black, silicon dioxide dispersion emulsion and an adhesive, the aqueous graphene dispersion liquid is 30 parts by weight, the acetylene carbon black is 2.5 parts by weight, the silicon dioxide dispersion emulsion is 0.7 part by weight, and the adhesive is 0.8 part by weight; the component C is a composite white material and comprises the following components in parts by weight: 120 parts of a polyol composition (wherein 12 parts of polyethylene glycol with the average molecular weight of 200-1000, 108 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3), 50 parts of a flame retardant, 5 parts of a catalyst (stannous octoate) and 50 parts of nano-mineral crystals with the particle size of 30-50 nm; the foam stabilizer is 20 parts by weight, the chain extender (ethylene glycol) is 12 parts by weight, and the water is 8 parts by weight.
Example 5
An antistatic polyurethane foam base material comprises a component A, a component B and a component C, wherein the component A is diphenylmethane diisocyanate and is 100 parts by weight, the component B is a mixture of aqueous graphene dispersion liquid, acetylene carbon black, silicon dioxide dispersion emulsion and an adhesive, the aqueous graphene dispersion liquid is 28 parts by weight, the acetylene carbon black is 2.5 parts by weight, the silicon dioxide dispersion emulsion is 0.6 part by weight, and the adhesive is 0.8 part by weight; the component C is a composite white material and comprises the following components in parts by weight: 110 parts of a polyol composition (wherein 20 parts of polyethylene glycol with the average molecular weight of 200-1000, 90 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3), 45 parts of a flame retardant, 4 parts of a catalyst (stannous octoate) and 45 parts of a nano-mineral crystal with the particle size of 30-50 nm; the foam stabilizer is 18 parts by weight, the chain extender (ethylene glycol) is 9 parts by weight, and the water is 6.5 parts by weight.
Comparative example 1
The method comprises the following steps: the foaming agent comprises polyester polyol with a hydroxyl value of 20-500 and a functionality of 2-3, a catalyst, a flame retardant, water, a foam stabilizer and a chain extender, and is uniformly mixed to form a white material, wherein the polyester polyol comprises 100 parts by weight, the catalyst comprises 2 parts by weight (0.5 part of triethylene diamine and 1.5 parts of stannous octoate), the water comprises 10 parts by weight, the foam stabilizer comprises 4 parts by weight, and the cell opening agent comprises 6 parts by weight;
step two: weighing 100 parts by weight of diphenylmethane diisocyanate to form a black material;
step three: the method comprises the steps of putting black materials into a container, stirring white materials uniformly, pouring the white materials into a mold, forming a plurality of through holes which are uniformly distributed on the side wall of the mold, connecting the through holes with a container for containing the black materials through a pipeline, introducing the black materials into the white materials through the through holes for foaming to obtain a polyurethane foam body, coating the polyurethane foam body on a release film or a permanent support film or other carriers, treating the polyurethane foam body to reach uniform thickness, and drying the polyurethane foam body to form a polyurethane cotton base material, wherein the thickness of the polyurethane cotton base material is 0.1 mm.
Comparative example 2 the same preparation method as in example 1 was employed, except that the amounts of the components added were different, specifically:
comparative example 2
A polyurethane foam base material comprises a component A, a component B and a component C, wherein the component A is diphenylmethane diisocyanate and is 100 parts by weight, the component B is a mixture of aqueous graphene dispersion liquid, acetylene carbon black, silicon dioxide dispersion emulsion and an adhesive, the aqueous graphene dispersion liquid is 10 parts by weight, the acetylene carbon black is 0.2 part by weight, the silicon dioxide dispersion emulsion is 0.5 part by weight, and the adhesive is 0.2 part by weight; the component C is a composite white material and comprises the following components in parts by weight: 110 parts of a polyol composition (wherein, 0 part of polyethylene glycol with the average molecular weight of 200-1000, 110 parts of polyester polyol with the hydroxyl value of 20-500 and the functionality of 2-3), 45 parts of a flame retardant, 4 parts of a catalyst (stannous octoate) and 0 part of nano-mineral crystals with the particle size of 30-50 nm; the foam stabilizer is 18 parts by weight, the chain extender (ethylene glycol) is 9 parts by weight, and the water is 6.5 parts by weight.
The polyurethane foam substrates prepared in comparative example 1, comparative example 2 and examples 1 to 5 were subjected to performance tests including tests of tensile strength, static friction coefficient, dynamic friction coefficient, surface resistance and TVOC amount, and the test results are detailed in table 1.
TABLE 1 results of performance test of examples and comparative examples
The experimental results in table 1 show that the addition of the component B can improve the antistatic property of the polyurethane foam substrate, the static friction coefficient and the dynamic friction coefficient can be reduced by adding the silica dispersed emulsion, the viscosity between the rolled polyurethane films can be reduced, and the volatilization of TVOC of the polyurethane foam substrate can be reduced by adding the nano-mineral crystals.
The invention also provides an adhesive tape, which comprises the polyurethane cotton base material, an adhesive layer and a release film, wherein the polyurethane cotton base material is the anti-static polyurethane cotton base material, so that the adhesive tape has good conductivity and can be used for packaging electronic products.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An antistatic polyurethane foam base material is characterized by comprising a component A, a component B and a component C, wherein the component A is diphenylmethane diisocyanate and accounts for 100 parts by weight; the component B is a mixture of aqueous graphene dispersion liquid, acetylene carbon black, silicon dioxide dispersion emulsion and an adhesive, wherein the aqueous graphene dispersion liquid is 15-30 parts by weight, the acetylene carbon black is 0.5-3 parts by weight, the silicon dioxide dispersion emulsion is 0.2-0.8 part by weight, and the adhesive is 0.5-1 part by weight; the component C is a combined white material and comprises the following components in parts by weight:
80-120 parts of a polyol composition;
30-50 parts of a flame retardant;
2-5 parts of a catalyst;
20-40 parts of nano mineral crystals with the particle size of 30-50 nm;
5-20 parts of a foam stabilizer;
5-12 parts of a chain extender;
4-8 parts of water.
2. The antistatic polyurethane foam substrate as claimed in claim 1, wherein the polyol composition comprises:
10-20 wt% of polyethylene glycol with the average molecular weight of 200-1000;
80-90 wt% of polyester polyol having a hydroxyl value of 20-500 and a functionality of 2-3.
3. The antistatic polyurethane foam substrate as claimed in claim 1, wherein the flame retardant is ammonium phosphate.
4. The antistatic polyurethane foam substrate as claimed in claim 1, wherein the catalyst is an amine catalyst or a tin catalyst.
5. The antistatic polyurethane foam substrate as claimed in claim 1, wherein the foam stabilizer is polydimethylsiloxane.
6. The antistatic polyurethane foam substrate as claimed in claim 1, wherein the chain extender is one or more of 1, 4-butanediol, ethylene glycol, ethylenediamine and diethylenediamine.
7. The antistatic polyurethane foam substrate as claimed in claim 1, wherein the binder is one selected from the group consisting of tetrafluoroethylene resin, polyvinylidene fluoride, and styrene-butadiene rubber.
8. The method for preparing an antistatic polyurethane foam substrate as claimed in any one of claims 1 to 7, comprising the steps of:
the method comprises the following steps: weighing 100 parts of the component A, placing the component A into a container, weighing the aqueous graphene dispersion liquid, the acetylene carbon black, the silicon dioxide dispersion liquid and the adhesive according to the formula weight, and uniformly mixing the components through a high-shear emulsifying machine to obtain the component B;
step two: weighing a polyol composition, a flame retardant, a foaming agent, nano-mineral crystals with the particle size of 30-50 nm, a foam stabilizer, a chain extender and water according to the formula weight, and uniformly stirring to obtain a component C;
step three: pouring the component C into a mold, wherein the side wall of the mold is provided with a plurality of uniformly distributed through holes, and the through holes are connected with a container for containing the component A through a pipeline;
step four: coating the component B in the step one on the surface of the component C, and then introducing the component A into the component C through the through holes for foaming to obtain a polyurethane foam body;
step five: the polyurethane foam is coated onto a release film or permanent support film or other carrier, treated to a uniform thickness, and dried to form a polyurethane substrate.
9. The method for preparing an antistatic polyurethane foam substrate as claimed in claim 8, wherein the B component forms a lattice structure on the surface of the polyurethane foam, and the lattice structure can be elongated under pressure.
10. An adhesive tape comprising a polyurethane foam base material, an adhesive layer and a release film, wherein the polyurethane foam base material is prepared by the preparation method of the antistatic polyurethane foam base material as claimed in any one of claims 8 or 9.
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