CN112608533B - Conductive latex and preparation method and application thereof - Google Patents
Conductive latex and preparation method and application thereof Download PDFInfo
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- CN112608533B CN112608533B CN202011389942.5A CN202011389942A CN112608533B CN 112608533 B CN112608533 B CN 112608533B CN 202011389942 A CN202011389942 A CN 202011389942A CN 112608533 B CN112608533 B CN 112608533B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
- C08L7/02—Latex
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D19/00—Gloves
- A41D19/0055—Plastic or rubber gloves
- A41D19/0058—Three-dimensional gloves
- A41D19/0065—Three-dimensional gloves with a textile layer underneath
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D2500/00—Materials for garments
- A41D2500/50—Synthetic resins or rubbers
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D2600/00—Uses of garments specially adapted for specific purposes
- A41D2600/20—Uses of garments specially adapted for specific purposes for working activities
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention provides a conductive latex and a preparation method and application thereof, wherein the conductive latex comprises, by weight, 80-90 parts of natural latex, 1-3 parts of conductive paste, 0.3-0.7 part of dispersing agent and 0.5-1 part of vulcanizing agent, and the conductive latex is prepared by adding the conductive paste and the dispersing agent into the natural latex, so that the conductive paste and the natural latex have good compatibility, and further the conductive latex with excellent stability is obtained; the prepared conductive latex has excellent conductivity by adjusting the dosage of each component in the formula; the glove containing the conductive latex has good conductivity and is very comfortable to wear.
Description
Technical Field
The invention belongs to the technical field of labor protection articles, and particularly relates to conductive latex and a preparation method and application thereof.
Background
Labor gloves, including rubber gloves, plastic gloves, and latex gloves, among others. Currently, with the high functionalization and diversification of electronic products or electronic devices, electronic devices equipped with a touch panel are increasing, and people using such electronic products can input information to the electronic products by contacting the touch panel with a finger or other components such as a touch pen, and the touch panel can be operated by, for example, a resistive pressure method, a capacitive method, an infrared method, or the like. However, when a user contacts the touch panel with a common glove such as a leather glove, a knitted glove made of a fiber fabric, and a knitted glove knitted with a thread, the touch panel does not act because such a glove is a non-conductor. Therefore, the intelligent mobile phone can be used or the electronic equipment can be operated after the glove is detached, so that the operation is inconvenient. Therefore, how to operate the electronic device sensitively and conveniently while wearing the glove becomes a research hotspot for researchers.
CN110982134a discloses a rubber glove with a conductive touch screen function, which comprises a glove body, wherein a conductive layer is arranged on the outer surface of the glove body; the glove body is formed by mixing rubber-based adhesive and conductive solution according to the weight ratio of 90:10; the conductive layer is prepared from a conductive solution; the conductive solution comprises the following raw materials in parts by weight: 20-30 parts of sodium polyacrylate, 20-30 parts of carboxymethyl cellulose and 45-55 parts of water; the glove can be used for flexibly operating the touch screen mobile phone and the touch screen computer under the condition that a user wears the glove. CN107936318A discloses an antistatic high-cleanness latex glove, which comprises the following raw materials in parts by weight: 50-80 parts of natural latex; 0.1 to 0.5 part of accelerator ZDC; 0.1-2 parts of sulfur; 0.5-2 parts of zinc oxide; 0.1 to 0.3 part of anti-aging agent; 0.5 to 1 part of potassium hydroxide; 0.1 to 0.3 part of lanolin; 1-2 parts of conductive material; 1-2 parts of defoaming agent. The latex has the beneficial effects that: the conductive material formed by mixing lithium manganate particles and a porous three-dimensional carbon skeleton structure is added into the preparation raw materials of the latex glove, so that the latex glove has better conductive and antistatic properties. However, the conductive materials and the rubber materials in the conductive rubber glove prepared by the two methods have poor compatibility, so that the dispersibility of the conductive solution in the rubber body is poor, the conductive effect of different parts of the obtained rubber glove is uneven, the situation that some parts of the glove are not conductive when the glove is used easily occurs, and inconvenience is brought to a user.
CN107043477a discloses a graphene/butyronitrile latex composite slurry, and a preparation method and application thereof; the composite slurry comprises the following components in parts by weight: 100 parts of nitrile rubber and 0.025-5 parts of graphene; the composite slurry also comprises 4-6 parts of ball-milling sulfur material, wherein the ball-milling sulfur material comprises the following components in percentage by weight based on the total weight of the ball-milling sulfur material: 5 to 8 percent of sulfur, 22 to 28 percent of zinc oxide, 5 to 8 percent of accelerator, 2 to 4 percent of anti-aging agent, 1.5 to 3 percent of ethylamine, 2 to 4 percent of dispersant, 5 to 8 percent of casein and 40 to 55 percent of soft water. The graphene/butyronitrile latex glove prepared from the composite slurry has the advantages of high tearing strength, antibacterial property, static resistance, small stretching stress, good ageing resistance, full play of the advantages of high conductivity, high strength, friction resistance, strong bacteriostasis and the like of graphene, but poor cold resistance of the used butyronitrile rubber, and the glove prepared from the butyronitrile rubber has hard texture and uncomfortable wearing.
Therefore, it is important to develop a conductive latex having excellent dispersibility and excellent conductivity, and further to obtain a conductive latex glove having excellent conductivity and being comfortable to wear.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a conductive latex, a preparation method and application thereof, wherein the conductive latex comprises a combination of natural latex, conductive paste, a dispersing agent and a vulcanizing agent, the conductive paste and the natural latex have good compatibility by adding the conductive paste and the dispersing agent into the natural latex, and the conductive latex has excellent conductivity by adjusting the dosage of each component in a formula, so that the conductivity and wearing comfort of gloves containing the conductive latex are improved.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a conductive latex comprising, by weight, 80 to 90 parts of natural latex, 2 to 5 parts of conductive paste, 0.3 to 0.7 part of dispersant, and 0.5 to 1 part of vulcanizing agent.
The natural latex may be 81 parts by weight, 82 parts by weight, 83 parts by weight, 84 parts by weight, 85 parts by weight, 86 parts by weight, 87 parts by weight, 88 parts by weight, 89 parts by weight, or the like.
The conductive paste may be 2.2 parts by weight, 2.4 parts by weight, 2.6 parts by weight, 2.8 parts by weight, 3 parts by weight, 3.2 parts by weight, 4.4 parts by weight, 4.6 parts by weight, 4.8 parts by weight, or the like.
The dispersant may be 0.33, 0.36, 0.38, 0.42, 0.45, 0.48, 0.52, 0.55, 0.58, 0.62, 0.65 or 0.68 parts by weight, etc.
The vulcanizing agent may be 0.55 parts by weight, 0.6 parts by weight, 0.65 parts by weight, 0.7 parts by weight, 0.75 parts by weight, 0.8 parts by weight, 0.85 parts by weight, 0.9 parts by weight, 0.95 parts by weight, or the like.
According to the conductive latex provided by the invention, the conductive paste is added into the natural latex, and the stability of the natural latex is influenced by the addition of the conductive paste into the natural latex, so that the paste phenomenon of the sizing material is generated, the stability is lost, flocculation is generated, and the subsequent forming processing cannot be completed; therefore, the dispersing agent capable of improving the compatibility of the conductive paste and the natural latex is added in the formula, so that the dispersibility of the conductive paste in the natural latex is good, the conductive latex with uniform conductivity can be obtained, and the conductivity of the conductive latex is improved;
the conductive latex provided by the invention has excellent conductivity and wear resistance only by matching 80-90 parts by weight of natural latex with 2-5 parts by weight of conductive paste, and if the conductive paste is excessively added, the conductive property is increased, but the wear resistance is reduced; if the addition of the conductive paste is too small, the conductive performance is reduced, and the conductive latex glove prepared later cannot meet the touch screen requirement.
Preferably, the viscosity of the conductive latex is 200 to 2000 mPa-s, for example 300 mPa-s, 400 mPa-s, 500 mPa-s, 600 mPa-s, 700 mPa-s, 800 mPa-s, 900 mPa-s, 1000 mPa-s, 1200 mPa-s, 1400 mPa-s, 1600 mPa-s or 1800 mPa-s, and the specific point values between the above point values, are limited to a spread and for the sake of brevity, the invention is not exhaustive of the specific point values comprised in the range.
Preferably, the natural latex has a solids content of 40 to 70%, such as 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66% or 68%, and specific point values between the above, are for brevity and for brevity the present invention is not intended to be exhaustive of the specific point values included in the range.
Preferably, the surface resistance of the conductive paste is not higher than 0.003 Ω, for example, 0.0025 Ω, 0.002 Ω, 0.0015 Ω, 0.001 Ω or 0.0005 Ω, and specific point values between the above point values, are limited in length and for brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the conductive paste includes any one or a combination of at least two of a metal-based conductive paste, a carbon-based conductive paste, or a metal-carbon composite conductive paste.
Preferably, the carbon-based conductive paste includes graphene conductive paste and/or carbon nanotube conductive paste.
Preferably, the metal-carbon composite conductive paste comprises any one or a combination of at least two of copper-plated graphene conductive paste, copper-plated carbon nanotube conductive paste, silver-plated graphene conductive paste or silver-plated carbon nanotube conductive paste.
Preferably, the dispersant comprises a styrene-maleic anhydride alternating copolymer.
Preferably, the styrene-maleic anhydride alternating copolymer has a molecular weight of 100000 ～ 200000Da, such as 110000Da, 120000Da, 130000Da, 140000Da, 150000Da, 160000Da, 170000Da, 180000Da, or 190000Da, and specific point values between the above point values, are limited in space and for brevity, the invention is not exhaustive of the specific point values encompassed by the ranges.
Preferably, the molar ratio of maleic anhydride monomer to styrene monomer in the alternating styrene-maleic anhydride copolymer is 1 (1-1.5), such as 1:1.05, 1:1.1, 1:1.15, 1:1.2, 1:1.25, 1:1.3, 1:1.35, 1:1.4, or 1:1.45, etc.
As a preferable technical scheme of the invention, the dispersing agent provided by the invention comprises a styrene-maleic anhydride alternating copolymer which is an important functional polymer, the molecular designability is strong, and anhydride groups on a main chain can react with alcohol, amine, water and the like to form various derivatives; the styrene-maleic anhydride alternating copolymer and the derivative thereof have the characteristics of high surface activity, low interfacial tension and the like due to the special molecular structure; in addition, the interaction between the maleic anhydride and water is enhanced due to the hydrophilicity of the maleic anhydride after hydrolysis, so that the styrene-maleic anhydride based copolymer has certain biodegradability, and the addition of the styrene-maleic anhydride alternating copolymer can well disperse the conductive paste in a natural latex system, so that the subsequent molding processing can be effectively performed.
Preferably, the sulfiding agent comprises sulfur and/or zinc oxide.
Preferably, the content of sulfur in the conductive latex is 0.3 to 0.65 parts by weight, for example, 0.32 parts by weight, 0.34 parts by weight, 0.36 parts by weight, 0.38 parts by weight, 0.4 parts by weight, 0.42 parts by weight, 0.44 parts by weight, 0.46 parts by weight, 0.48 parts by weight, 0.52 parts by weight, 0.58 parts by weight or 0.6 parts by weight, and specific point values between the above point values are limited to a range and the present invention is not exhaustive list of specific point values included in the range for brevity.
Preferably, the zinc oxide content of the conductive latex is 0.2 to 0.35 parts by weight, for example, 0.22 parts by weight, 0.24 parts by weight, 0.26 parts by weight, 0.28 parts by weight, 0.3 parts by weight, 0.32 parts by weight or 0.34 parts by weight, and specific point values between the above point values are limited in space and for brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the conductive latex further comprises any one or a combination of at least two of a stabilizer, a promoter, an antioxidant, a brightening agent, a filler, a color enhancer or a thickener.
Preferably, the content of the stabilizer in the conductive latex is 1 to 2.5 parts by weight, for example, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, 2 parts by weight, 2.2 parts by weight or 2.4 parts by weight, and specific point values between the above point values are limited in length and for brevity, the present invention is not exhaustive to list the specific point values included in the range.
Preferably, the stabilizer comprises potassium hydroxide and/or casein.
Preferably, the content of potassium hydroxide in the conductive latex is 0.3 to 0.8 parts by weight, for example, 0.33 parts by weight, 0.36 parts by weight, 0.39 parts by weight, 0.42 parts by weight, 0.45 parts by weight, 0.48 parts by weight, 0.52 parts by weight, 0.55 parts by weight, 0.58 parts by weight, 0.62 parts by weight, 0.68 parts by weight, 0.7 parts by weight or 0.75 parts by weight, and specific point values between the above point values are limited to a short term and for brevity, the present invention does not exhaustively enumerate specific point values included in the range.
Preferably, the content of casein in the conductive latex is 0.7 to 1.7 parts by weight, for example, 0.9 parts by weight, 1 parts by weight, 1.1 parts by weight, 1.2 parts by weight, 1.3 parts by weight, 1.4 parts by weight, 1.5 parts by weight or 1.6 parts by weight, and specific point values among the above point values are limited in size and for brevity, the present invention is not exhaustive list of specific point values included in the range.
Preferably, the content of the accelerator in the conductive latex is 0.2 to 0.3 parts by weight, for example, 0.21 parts by weight, 0.22 parts by weight, 0.23 parts by weight, 0.24 parts by weight, 0.25 parts by weight, 0.26 parts by weight, 0.27 parts by weight, 0.28 parts by weight or 0.29 parts by weight, and specific point values between the above point values are limited to a spread and for brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the antioxidant is contained in the conductive latex in an amount of 0.3 to 0.7 parts by weight, for example, 0.33 parts by weight, 0.36 parts by weight, 0.39 parts by weight, 0.42 parts by weight, 0.45 parts by weight, 0.48 parts by weight, 0.62 parts by weight, 0.65 parts by weight or 0.68 parts by weight, and specific point values between the above point values are limited in length and for brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the content of the brightening agent in the conductive latex is 1.5 to 2 parts by weight, for example, 1.55 parts by weight, 1.6 parts by weight, 1.65 parts by weight, 1.7 parts by weight, 1.75 parts by weight, 1.8 parts by weight, 1.85 parts by weight, 1.9 parts by weight or 1.95 parts by weight, and specific point values between the above point values, are limited in space and for brevity, the present invention is not exhaustive of the specific point values included in the range.
Preferably, the brightening agent comprises paraffin wax.
Preferably, the filler is contained in the conductive latex in an amount of 2 to 2.5 parts by weight, for example, 2.1 parts by weight, 2.15 parts by weight, 2.2 parts by weight, 2.25 parts by weight, 2.3 parts by weight, 2.35 parts by weight, 2.4 parts by weight or 2.45 parts by weight, and specific point values among the above point values are limited in terms of space and for brevity, the present invention is not exhaustive list of specific point values included in the range.
Preferably, the filler comprises kaolin.
Preferably, the content of the toner in the conductive latex is 0.05 to 0.15 parts by weight, for example, 0.06 parts by weight, 0.07 parts by weight, 0.08 parts by weight, 0.09 parts by weight, 0.1 parts by weight, 0.11 parts by weight, 0.12 parts by weight, 0.13 parts by weight or 0.14 parts by weight, and specific point values between the above point values are limited to a space and the present invention is not exhaustive list of specific point values included in the range for brevity.
Preferably, the color enhancer comprises a pigment.
Preferably, the content of the thickener in the conductive latex is 4.5 to 5.5 parts by weight, for example, 4.6 parts by weight, 4.7 parts by weight, 4.8 parts by weight, 4.9 parts by weight, 5 parts by weight, 5.1 parts by weight, 5.2 parts by weight, 5.3 parts by weight or 5.4 parts by weight, and specific point values between the above point values are limited in size and for the sake of brevity, the present invention does not exhaustive list the specific point values included in the range.
Preferably, the thickener comprises sodium polyacrylate.
In a second aspect, the present invention provides a method for preparing the conductive latex according to the first aspect, the method comprising the steps of:
(1) Mixing a dispersing agent with the conductive slurry to obtain a conductive dispersion; heat treating natural latex and optionally stabilizer to obtain heat treated latex;
(2) Mixing a vulcanizing agent, optionally an accelerator, optionally an antioxidant, optionally a filler, and the heat-treated latex obtained in step (1), and pre-vulcanizing to obtain a pre-vulcanized latex;
(3) Cooling the pre-vulcanized latex obtained in the step (2), and mixing the pre-vulcanized latex with the conductive dispersion liquid obtained in the step (1), an optional brightening agent and an optional color-increasing agent to obtain the conductive latex.
The preparation method of the conductive latex comprises the steps of firstly mixing a dispersing agent and conductive slurry to obtain conductive dispersion liquid with uniformly dispersed conductive slurry, carrying out heat treatment on natural latex and optional stabilizing agent, then adding a vulcanizing agent, optional antioxidant, an accelerator and a filler into the latex after heat treatment, carrying out presulfiding, and finally cooling the presulfided latex and mixing the presulfided latex with the conductive dispersion liquid to obtain the conductive latex.
Preferably, the time of the heat treatment in step (1) is 3 to 10 hours, such as 3.5 hours, 4.2 hours, 4.3 hours, 5.4 hours, 5.5 hours, 6.6 hours, 7.7 hours, 8.8 hours or 9.9 hours, and the specific point values between the above point values, are limited in length and for the sake of brevity, the invention is not exhaustive of the specific point values comprised in the range.
Preferably, the temperature of the heat treatment in step (1) is 40 to 50 ℃, such as 40.5 ℃, 41 ℃, 42.5 ℃, 43 ℃, 43.5 ℃, 45 ℃, 45.5 ℃, 47 ℃ or 47.5 ℃, and specific point values between the above point values, are limited in length and for the sake of brevity, the invention is not exhaustive of the specific point values comprised in the range.
Preferably, the temperature of the mixing in step (2) is 40-50 ℃, such as 40.5 ℃, 41 ℃, 42.5 ℃, 43 ℃, 43.5 ℃, 45 ℃, 45.5 ℃, 47 ℃ or 47.5 ℃, and specific point values between the above point values, limited in space and for the sake of brevity, the invention is not exhaustive of the specific point values comprised in the range.
Preferably, the mixing time of step (2) is 2 to 10 hours, such as 2.1 hours, 4.2 hours, 3.3 hours, 4.4 hours, 5.5 hours, 6.6 hours, 7.7 hours, 8.8 hours or 9.9 hours, and the specific point values between the above point values, are limited in space and for reasons of brevity the invention is not exhaustive of the specific point values comprised in the range.
Preferably, the chloroform values of the pre-vulcanized latex in the step (2) are two to four primary.
Preferably, the temperature of the cooled system of step (3) is between 10 and 28 ℃, such as 12 ℃, 14 ℃, 16 ℃, 18 ℃, 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃, 25 ℃, 26 ℃ or 27 ℃, and specific values between the above, for reasons of space and for reasons of simplicity, the invention is not intended to be exhaustive of the specific values comprised in the range.
Preferably, the mixing time in step (3) is 20-40 min, such as 21min, 22min, 23min, 24min, 25min, 26min, 27min, 28min or 29min, and the specific point values between the above point values, which are limited in space and for brevity, the present invention is not exhaustive.
Preferably, the step (3) further comprises the step of adding a thickener after the mixing is completed.
As a preferable technical scheme, the preparation method comprises the following steps:
(1) Mixing a dispersing agent with the conductive slurry to obtain a conductive dispersion; carrying out heat treatment on natural latex and optional stabilizer at 40-50 ℃ for 3-10 h to obtain heat-treated latex;
(2) Mixing a vulcanizing agent, an optional accelerator, an optional antioxidant, an optional filler and the heat-treated latex obtained in the step (1) at 40-50 ℃ for 2-10 hours to obtain a pre-vulcanized latex;
(3) Cooling the pre-vulcanized latex obtained in the step (2) to 10-28 ℃, mixing the cooled pre-vulcanized latex with the conductive dispersion liquid obtained in the step (1), optionally a brightening agent and optionally a coloring agent for 20-40 min, and adding a thickening agent to obtain the conductive latex.
In a third aspect, the present invention provides a conductive latex glove comprising the conductive latex of the first aspect and a glove blank.
Preferably, the conductive latex glove is prepared by a method comprising: and (3) dipping, coating slip-resisting treatment, foam washing and co-vulcanization are carried out on the glove blank by using the conductive latex, so as to obtain the conductive latex glove.
Preferably, the glove blank material comprises one or a combination of at least two of terylene, chinlon, aramid, acrylic, glass fiber, steel wire or polyethylene fiber.
Compared with the prior art, the invention has the following beneficial effects:
the conductive latex provided by the invention comprises natural latex, conductive slurry, a dispersing agent and a vulcanizing agent, wherein the conductive slurry and the dispersing agent are added into the natural latex, so that the conductive slurry and the natural latex have good compatibility, and the conductive latex with excellent stability is obtained; and by adjusting the components of the formulationThe amount of the polymer is such that the prepared conductive latex has excellent conductivity, and the surface resistance of the conductive latex glove containing the conductive latex is 10 4 ～10 5.5 Omega can meet the operation touch screen requirement of products, and the prepared conductive latex glove has better wear resistance and is very comfortable to wear.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
Examples 1 to 3
The viscosities of the electroconductive latices of examples 1 to 3 were 600 mPas, 800 mPas and 1200 mPas, respectively, and the specific components are shown in Table 1, and the amounts of the components are in parts by weight.
TABLE 1
The preparation method comprises the following steps:
(1) Styrene-maleic anhydride alternating copolymer (model SZ26080, POLYSCOPE Polymer b.v, netherlands) was mixed with copper-plated carbon nanotube paste (model CNT813, 3% solids, of the beijing-de-family island gold technology company, ltd.) to obtain a conductive dispersion; carrying out heat treatment on natural latex (Huang Chunfa), 10 mass percent of potassium hydroxide and casein for 3.5 hours at 47 ℃ to obtain heat-treated latex;
(2) Mixing sulfur, zinc oxide, an accelerator ZDC, an accelerator BZ, an antioxidant 2246, kaolin (Shanghai mountain titanium dioxide chemical products Co., ltd.) and the heat-treated latex obtained in the step (1) at 47 ℃ for 2.5 hours to obtain a chloroform-value two-terminal pre-vulcanized latex;
(3) And (3) cooling the pre-vulcanized latex obtained in the step (2) to 20 ℃, mixing the cooled pre-vulcanized latex with the conductive dispersion liquid obtained in the step (1), paraffin wax and blue pigment (7162A) for 30min, and adding sodium polyacrylate (Nantongda textile size Co., ltd.) to obtain the conductive latex.
Example 4
An electroconductive latex differing from example 1 in that the amount of natural latex added was 84 parts by weight, the amount of copper-plated carbon nanotube paste added was 4 parts by weight, and the other components, amounts and preparation methods were the same as in example 1, to obtain the electroconductive latex.
Example 5
A conductive latex was obtained in the same manner as in example 1 except that 86 parts by weight of natural latex was added and 2 parts by weight of copper-plated carbon nanotube paste was added to the conductive latex, and other components, amounts and preparation methods were the same as in example 1.
Comparative example 1
An electroconductive latex differing from example 1 only in that no styrene-maleic anhydride alternating copolymer was added, 0.5 parts by weight of deionized water was added, and other components, amounts and preparation methods were the same as in example 1, to obtain the electroconductive latex.
Comparative example 2
A conductive latex was obtained in the same manner as in example 1 except that the addition amount of the natural latex was 80 parts by weight, the addition amount of the copper-plated carbon nanotube paste was 8 parts by weight, and other components, amounts and preparation methods were the same as in example 1.
Comparative example 3
A conductive latex was obtained in the same manner as in example 1 except that the amount of the natural latex added was 87.5 parts by weight, the amount of the copper-plated carbon nanotube paste added was 0.5 parts by weight, and other components, amounts and preparation methods were the same as in example 1.
Comparative example 4
An electroconductive latex differing from example 1 in that the natural latex of example 1 was replaced with a nitrile latex (type 6300, zhenjiang emperor chemical Co., ltd.) and the electroconductive latex was obtained in the same manner as in example 1 in terms of other components, amounts and preparation methods.
Application examples 1 to 5
A conductive latex glove comprising the conductive latex obtained in examples 1 to 5 and a glove blank (Jiangsu Hengsheng glove Co., ltd., model 357), respectively;
the preparation method comprises the following steps: dipping the glove blank by the conductive latex for 8s, soaking and washing for 40min, and jointly vulcanizing for 90min at 100 ℃ to obtain the conductive latex glove.
Comparative application examples 1 to 4
A conductive latex glove comprising the conductive latex obtained in comparative examples 1 to 4 and a glove blank (Jiangsu Hengsheng glove Co., ltd., model 357), respectively;
the preparation method is the same as that of application example 1, and the conductive latex glove is obtained.
Performance test:
(1) Surface resistance: adopting a surface resistance tester SIMCO ST-4 to test; the testing steps comprise: the tester is horizontally placed on the tested object, the rubber rod at the bottom of the tester is required to be completely contacted with the tested object, the red square button is pressed down, the test result is waited, if the test result shows 10.7, the surface resistance of the object is 10 10.7 Ω；
(2) Comfort level: the wearing of the glove is realized by the man, the glove is attached to the hand, the operation is flexible, the fingers have no sense of compression, and the comfort is excellent; if the pectin is hard, the fingers are not easy to bend or are inflexible to operate, and the comfort level is poor;
(3) Wear resistance: the abrasion resistance test was carried out according to EN388:2016, protective glove against mechanical hazards.
The conductive latex gloves obtained in application examples 1 to 5 and comparative application examples 1 to 4 were tested according to the above test, and the test data are shown in the following table:
TABLE 2
From the above table data it can be seen that:
the conductive latex glove prepared by using the conductive latex provided by the invention has excellent conductivity, wearing comfort and wear resistance; specifically, the surface resistance of the conductive latex glove provided in application examples 1 to 5 was 10 4 ～10 5.5 Omega, can meet the operation touch screen requirement of the product, and the conductive latex glove prepared has better comfort and better wear resistance; in contrast, in comparative application example 1, since the conductive latex prepared without adding the styrene-maleic anhydride alternating copolymer as a dispersant is creamed and flocculated by continuous stirring, the subsequent glove preparation cannot be performed; the conductive latex glove obtained in comparative application example 2 has poor abrasion resistance due to excessive addition of the conductive paste; the conductive latex glove obtained in the comparative application example 3 cannot meet the requirement of operating the touch screen because the addition amount of the conductive paste is too low and the surface resistance is higher; whereas the conductive latex glove obtained in comparative application example 4 had a poor hand feel.
In summary, only by using natural latex to match conductive paste and dispersing agent and controlling the dosage ratio of natural latex and conductive paste, the conductive latex glove with excellent conductive performance, wear resistance and comfort can be obtained.
The applicant states that the present invention is described by way of the above examples as a conductive latex and a method of preparing and using the same, but the present invention is not limited to, i.e., does not mean that the present invention must be practiced in dependence upon the above examples. It should be apparent to those skilled in the art that any modification of the present invention, equivalent substitution of raw materials for the product of the present invention, addition of auxiliary components, selection of specific modes, etc., falls within the scope of the present invention and the scope of disclosure.
Claims (37)
1. The conductive latex is characterized by comprising, by weight, 80-90 parts of natural latex, 2-5 parts of conductive paste, 0.3-0.7 part of dispersing agent and 0.5-1 part of vulcanizing agent;
the conductive paste includes a metal-carbon composite conductive paste;
the metal-carbon composite conductive paste comprises any one or a combination of at least two of copper plating graphene conductive paste, copper plating carbon nano tube conductive paste, silver plating graphene conductive paste or silver plating carbon nano tube conductive paste;
the dispersant comprises styrene-maleic anhydride alternating copolymer;
the solid content of the conductive paste was 3%.
2. The electrically conductive latex according to claim 1, wherein the viscosity of the electrically conductive latex is 200 to 2000 mPa-s.
3. The electrically conductive latex of claim 1, wherein the natural latex has a solids content of 40 to 70%.
4. The conductive latex according to claim 1, wherein the surface resistance of the conductive paste is not higher than 0.003 Ω.
5. The electrically conductive latex of claim 1, wherein the alternating styrene-maleic anhydride copolymer has a molecular weight of 100000 ～ 200000Da.
6. The electrically conductive latex of claim 1, wherein the styrene-maleic anhydride alternating copolymer has a molar ratio of maleic anhydride monomer to styrene monomer of 1 (1-1.5).
7. The electrically conductive latex of claim 1, wherein the vulcanizing agent comprises sulfur and/or zinc oxide.
8. The conductive latex according to claim 7, wherein the content of sulfur in the conductive latex is 0.3 to 0.65 parts by weight.
9. The conductive latex according to claim 7, wherein the zinc oxide content of the conductive latex is 0.2 to 0.35 parts by weight.
10. The electrically conductive latex of claim 1, further comprising any one or a combination of at least two of a stabilizer, an accelerator, an antioxidant, a brightening agent, a filler, a color enhancer, or a thickener.
11. The conductive latex according to claim 10, wherein the content of the stabilizer in the conductive latex is 1 to 2.5 parts by weight.
12. The conductive latex of claim 10, wherein the stabilizing agent comprises potassium hydroxide and/or casein.
13. The conductive latex according to claim 10, wherein the content of potassium hydroxide in the conductive latex is 0.3 to 0.8 parts by weight.
14. The conductive latex according to claim 10, wherein the content of casein in the conductive latex is 0.7 to 1.7 parts by weight.
15. The conductive latex according to claim 10, wherein the accelerator is contained in an amount of 0.2 to 0.3 parts by weight.
16. The conductive latex according to claim 10, wherein the content of the antioxidant in the conductive latex is 0.3 to 0.7 parts by weight.
17. The conductive latex according to claim 10, wherein the content of the brightening agent in the conductive latex is 1.5 to 2 parts by weight.
18. The electrically conductive latex of claim 10, wherein the brightening agent comprises paraffin wax.
19. The conductive latex according to claim 10, wherein the filler is contained in the conductive latex in an amount of 2 to 2.5 parts by weight.
20. The conductive latex of claim 10, wherein the filler comprises kaolin.
21. The conductive latex according to claim 10, wherein the content of the toner in the conductive latex is 0.05 to 0.15 parts by weight.
22. The electrically conductive latex of claim 10, wherein the color enhancer comprises a pigment.
23. The conductive latex according to claim 10, wherein the content of the thickener in the conductive latex is 4.5 to 5.5 parts by weight.
24. The electrically conductive latex of claim 10, wherein the thickener comprises sodium polyacrylate.
25. A method for producing the electroconductive latex according to any one of claims 1 to 24, comprising the steps of:
(1) Mixing a dispersing agent with the conductive slurry to obtain a conductive dispersion; heat treating natural latex and optionally stabilizer to obtain heat treated latex;
(2) Mixing a vulcanizing agent, optionally an accelerator, optionally an antioxidant, optionally a filler, and the heat-treated latex obtained in step (1), and pre-vulcanizing to obtain a pre-vulcanized latex;
(3) Cooling the pre-vulcanized latex obtained in the step (2), and mixing the pre-vulcanized latex with the conductive dispersion liquid obtained in the step (1), an optional brightening agent and an optional color-increasing agent to obtain the conductive latex.
26. The method according to claim 25, wherein the time of the heat treatment in the step (1) is 3 to 10 hours.
27. The method according to claim 25, wherein the temperature of the heat treatment in step (1) is 40 to 50 ℃.
28. The method of claim 25, wherein the temperature of the mixing in step (2) is 40-50 ℃.
29. The method of claim 25, wherein the mixing in step (2) is for a period of 2 to 10 hours.
30. The method of claim 25, wherein the pre-vulcanized latex in step (2) has a chloroform number of two to four primary.
31. The method according to claim 25, wherein the temperature of the cooled system in step (3) is 10 to 28 ℃.
32. The method of claim 25, wherein the mixing in step (3) is for a period of 20 to 60 minutes.
33. The method of claim 25, wherein the step (3) further comprises the step of adding a thickener after the mixing is completed.
34. The method of preparation according to claim 25, characterized in that the method of preparation comprises the steps of:
(1) Mixing a dispersing agent with the conductive slurry to obtain a conductive dispersion; carrying out heat treatment on natural latex and optional stabilizer at 40-50 ℃ for 3-10 h to obtain heat-treated latex;
(2) Mixing a vulcanizing agent, an optional accelerator, an optional antioxidant, an optional filler and the heat-treated latex obtained in the step (1) at 40-50 ℃ for 2-10 hours to obtain a pre-vulcanized latex;
(3) Cooling the pre-vulcanized latex obtained in the step (2) to 10-28 ℃, mixing the cooled pre-vulcanized latex with the conductive dispersion liquid obtained in the step (1), optionally a brightening agent and optionally a coloring agent for 20-60 min, and adding a thickening agent to obtain the conductive latex.
35. A conductive latex glove, comprising the conductive latex of any one of claims 1-24 and a glove blank.
36. The conductive latex glove of claim 35, wherein the conductive latex glove is prepared by a process comprising: and (3) dipping, coating slip-resisting treatment, foam washing and co-vulcanization are carried out on the glove blank by using the conductive latex, so as to obtain the conductive latex glove.
37. The electrically conductive latex glove according to claim 36, wherein the material of the glove blank comprises one or a combination of at least two of polyester, nylon, aramid, acrylic, fiberglass, steel wire, or polyethylene fibers.
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