CN112608533A - Conductive latex and preparation method and application thereof - Google Patents
Conductive latex and preparation method and application thereof Download PDFInfo
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- CN112608533A CN112608533A CN202011389942.5A CN202011389942A CN112608533A CN 112608533 A CN112608533 A CN 112608533A CN 202011389942 A CN202011389942 A CN 202011389942A CN 112608533 A CN112608533 A CN 112608533A
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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
Abstract
The invention provides a conductive latex and a preparation method and application thereof, wherein the conductive latex comprises 80-90 parts by weight of natural latex, 1-3 parts by weight of conductive slurry, 0.3-0.7 part by weight of dispersant and 0.5-1 part by weight of vulcanizing agent, and the conductive latex is prepared by adding the conductive slurry and the dispersant 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; 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 products, and particularly relates to conductive latex as well as a preparation method and application thereof.
Background
The labor protection gloves comprise several types, such as rubber gloves, plastic gloves, latex gloves and the like. Currently, with the high functionality and diversification of electronic products or electronic devices, there are increasing electronic devices equipped with touch panels, and people using such electronic products can input information to the electronic products by contacting the touch panels with fingers or other members such as touch pens, and the touch panels can be operated by, for example, a resistance pressure method, a capacitance method, an infrared method, and the like. However, when the user contacts the touch panel with general gloves such as leather gloves, woven gloves made of fiber fabric, and knitted gloves knitted with thread, the touch panel does not act since such gloves are nonconductors. Therefore, the smart phone can be used or the electronic equipment can be operated only after the gloves are detached, and the operation is inconvenient. Therefore, how to operate electronic devices flexibly and conveniently while wearing gloves becomes a research hotspot of 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 prepared by mixing rubber-based glue and a conductive solution according to the weight part ratio of 90: 10; the conducting layer is prepared from a conducting 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 user can flexibly operate the touch screen mobile phone and the touch screen computer under the condition of wearing gloves. CN107936318A discloses an antistatic high-cleanness latex glove, which comprises the following raw materials in parts by weight: 50-80 parts of natural latex; 0.1-0.5 part of accelerator ZDC; 0.1-2 parts of sulfur; 0.5-2 parts of zinc oxide; 0.1-0.3 part of an anti-aging agent; 0.5-1 part of potassium hydroxide; 0.1-0.3 parts of lanolin; 1-2 parts of a conductive material; 1-2 parts of a defoaming agent. The beneficial effects of the latex are mainly reflected in that: the conductive material formed by mixing the lithium manganate particles and the porous three-dimensional carbon skeleton structure is added into the raw materials for preparing the latex gloves, so that the latex gloves have better conductive and antistatic properties. However, the compatibility between the conductive material and the rubber material in the conductive rubber gloves prepared by the two methods is poor, so that the dispersibility of the conductive solution in the rubber glove body is poor, the conductive effect of different parts of the obtained rubber gloves is uneven, the condition that some parts of the gloves are not conductive when in use is easy to occur, and inconvenience is brought to users.
CN107043477A discloses 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 further comprises 4-6 parts of ball-milling sulfur material, and the ball-milling sulfur material comprises the following components in percentage by weight based on the total weight of the ball-milling sulfur material: 5-8% of sulfur, 22-28% of zinc oxide, 5-8% of accelerator, 2-4% of anti-aging agent, 1.5-3% of ethylamine, 2-4% of dispersant, 5-8% of casein and 40-55% of soft water. The graphene/butyronitrile latex gloves prepared from the composite slurry have the advantages of high tear strength, antibiosis, antistatic property, small stress at definite elongation and good aging resistance, and the advantages of high conductivity, high strength, friction resistance, strong bacteriostasis and the like of graphene are fully exerted, but the used butyronitrile rubber has poor cold resistance, and the gloves prepared from the butyronitrile rubber have hard texture and are uncomfortable to wear.
Therefore, it is very important to develop a conductive latex with good dispersibility and excellent conductivity, and further obtain a conductive latex glove with excellent conductivity and comfortable wearing.
Disclosure of Invention
In view of the defects 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, a conductive paste, a dispersant and a vulcanizing agent, the conductive paste and the natural latex have good compatibility by adding the conductive paste and the dispersant into the natural latex, and the conductive latex has excellent conductivity by adjusting the dosage of each component in the formula, so that the conductivity and the wearing comfort of gloves containing the conductive latex are improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a conductive latex, which comprises, 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 rubber 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, or the like.
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.
The conductive latex provided by the invention is added with the conductive slurry, and the stability of the natural latex can be influenced by adding the conductive slurry into the natural latex, so that the sizing material is creamed and loses stability, flocculation is generated, and the subsequent forming processing cannot be finished; the dispersing agent capable of improving the compatibility of the conductive paste and the natural latex is added into the formula, so that the conductive paste has good dispersibility in the natural latex, the conductive latex with uniform conductivity can be obtained, and the conductivity of the conductive latex is improved;
80-90 parts by weight of natural latex in the conductive latex is matched with 2-5 parts by weight of conductive paste, so that the conductive latex has excellent conductivity and wear resistance, and if the conductive paste is added in too much amount, the conductivity is increased, but the wear resistance is reduced; if the conductive slurry is added too little, the conductivity is reduced, and the conductive latex gloves prepared subsequently cannot meet the requirements of touch screens.
Preferably, the viscosity of the conductive latex is 200 to 2000 mPas, such as 300 mPas, 400 mPas, 500 mPas, 600 mPas, 700 mPas, 800 mPas, 900 mPas, 1000 mPas, 1200 mPas, 1400 mPas, 1600 mPas or 1800 mPas, and the specific values therebetween are not exhaustive and the invention is not limited to the specific values included in the ranges.
Preferably, the natural rubber latex has a solids content of 40-70%, such as 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66% or 68%, and the specific values therebetween, are not exhaustive for the sake of brevity and clarity, and are not intended to be exhaustive.
Preferably, the sheet resistance of the conductive paste is not higher than 0.003 Ω, such as 0.0025 Ω, 0.002 Ω, 0.0015 Ω, 0.001 Ω or 0.0005 Ω, and specific values therebetween, not limited to space and for the sake of brevity, are not exhaustive and are not included in the scope of the invention.
Preferably, the conductive paste includes any one of a metal-based conductive paste, a carbon-based conductive paste, or a metal-carbon composite conductive paste, or a combination of at least two thereof.
Preferably, the carbon-based conductive paste includes a graphene conductive paste and/or a carbon nanotube conductive paste.
Preferably, the metal-carbon composite conductive paste comprises any one of copper-plated graphene conductive paste, copper-plated carbon nanotube conductive paste, silver-plated graphene conductive paste or silver-plated carbon nanotube conductive paste or a combination of at least two of the above.
Preferably, the dispersant comprises a styrene-maleic anhydride alternating copolymer.
Preferably, the molecular weight of the styrene-maleic anhydride alternating copolymer is 100000 to 200000Da, such as 110000Da, 120000Da, 130000Da, 140000Da, 150000Da, 160000Da, 170000Da, 180000Da or 190000Da, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not intended to be exhaustive of the specific values included in the range.
Preferably, the molar ratio of the maleic anhydride monomer to the styrene monomer in the styrene-maleic anhydride alternating 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.
As a preferred technical scheme of the invention, the dispersant provided by the invention comprises a styrene-maleic anhydride alternating copolymer which is an important functional polymer and has strong molecular designability, and anhydride groups on a main chain can react with alcohol, amine, water and the like to form a plurality of 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, due to the fact that the maleic anhydride is hydrophilic after hydrolysis, interaction between the maleic anhydride and water is enhanced, the styrene-maleic anhydride-based copolymer has certain biodegradability, and due to the addition of the styrene-maleic anhydride alternating copolymer, the conductive slurry can be well dispersed in a natural latex system, and the subsequent forming processing can be effectively carried out.
Preferably, the vulcanizing agent comprises sulphur and/or zinc oxide.
Preferably, the content of sulfur in the conductive latex is 0.3 to 0.65 parts by weight, such as 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 therebetween are limited to space and for brevity, and the invention is not exhaustive of the specific point values included in the range.
Preferably, the content of the zinc oxide in the conductive latex is 0.2 to 0.35 parts by weight, such as 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 points therebetween are not exhaustive, and the invention is not limited to the specific points included in the range for brevity.
Preferably, the conductive latex further comprises any one or a combination of at least two of a stabilizer, an accelerator, an antioxidant, a brightener, a filler, a toner, or a thickener.
Preferably, the amount 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 values therebetween are not exhaustive, and for the sake of brevity, the invention is not intended to cover the specific values included in the ranges.
Preferably, the stabilizer comprises potassium hydroxide and/or casein.
Preferably, the content of the potassium hydroxide in the conductive latex is 0.3 to 0.8 parts by weight, such as 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 the specific points between the above points are limited by space and for brevity, the invention is not exhaustive and the specific points included in the range are not included in the invention.
Preferably, the conductive latex has a casein content of 0.7 to 1.7 parts by weight, such as 0.9 parts by weight, 1 part 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 values therebetween, and the invention is not exhaustive and for the sake of brevity only, specific values included in the ranges are not intended.
Preferably, the accelerator is included in the conductive latex in an amount of 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 points therebetween are not limited to space and for brevity, and the invention is not exhaustive.
Preferably, the antioxidant is present in the conductive latex in an amount of 0.3 to 0.7 parts by weight, such as 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 points therebetween, which are not intended to be space-wise and for the sake of brevity, are not exhaustive, and the invention is not intended to include specific points within the stated ranges.
Preferably, the conductive latex has a brightener content of 1.5 to 2 parts by weight, such as 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, or 1.95 parts by weight, and specific values therebetween, not to be limited by space and for brevity, the invention is not exhaustive of the specific values included in the ranges.
Preferably, the brightening agent comprises paraffin wax.
Preferably, the amount of the filler in the conductive latex is 2 to 2.5 parts by weight, such as 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 values therebetween, which are limited by space and for the sake of brevity, the present invention is not exhaustive and specific values included in the range are not included.
Preferably, the filler comprises kaolin.
Preferably, the content of the color enhancer in the conductive latex is 0.05 to 0.15 parts by weight, such as 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 points therebetween are not limited by space and for the sake of brevity, and the invention is not exhaustive of the specific points included in the range.
Preferably, the toner includes 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 points therebetween are limited by space and for brevity, and the invention is not exhaustive of the specific points included in the range.
Preferably, the thickener comprises sodium polyacrylate.
In a second aspect, the present invention provides a process for preparing the conductive latex of the first aspect, comprising the steps of:
(1) mixing a dispersing agent with the conductive slurry to obtain a conductive dispersion liquid; heat treating a natural latex and optionally a stabilizer to obtain a 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), and pre-vulcanizing to obtain pre-vulcanized latex;
(3) and (3) cooling the pre-vulcanized latex obtained in the step (2), and mixing the pre-vulcanized latex with the conductive dispersion obtained in the step (1), an optional brightening agent and an optional coloring agent to obtain the conductive latex.
The preparation method of the conductive latex comprises the steps of firstly mixing a dispersing agent and a conductive slurry to obtain a conductive dispersion liquid with the conductive slurry uniformly dispersed, carrying out heat treatment on natural latex and an optional stabilizer, then adding a vulcanizing agent and an optional antioxidant, an accelerator and a filler into the latex subjected to the heat treatment, carrying out pre-vulcanization, cooling the pre-vulcanized latex, and mixing the cooled pre-vulcanized latex with the conductive dispersion liquid to obtain the conductive latex.
Preferably, the heat treatment time 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 values therebetween are not exhaustive, and the invention is not limited to the specific values included in the range for brevity and conciseness.
Preferably, the temperature of the heat treatment in the step (1) is 40 to 50 ℃, for example, 40.5 ℃, 41 ℃, 42.5 ℃, 43 ℃, 43.5 ℃, 45 ℃, 45.5 ℃, 47 ℃ or 47.5 ℃, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive.
Preferably, the temperature of the mixing in step (2) is 40-50 ℃, for example 40.5 ℃, 41 ℃, 42.5 ℃, 43 ℃, 43.5 ℃, 45 ℃, 45.5 ℃, 47 ℃ or 47.5 ℃, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive of the specific values included in the range.
Preferably, the mixing time in step (2) is 2-10 h, such as 2.1h, 4.2h, 3.3h, 4.4h, 5.5h, 6.6h, 7.7h, 8.8h or 9.9h, and the specific values therebetween are not exhaustive, and for brevity and clarity, the invention is not intended to be exhaustive.
Preferably, the chloroform value of the pre-vulcanized latex in the step (2) is two to four times.
Preferably, the temperature of the cooled system in step (3) is 10-28 ℃, for example, 12 ℃, 14 ℃, 16 ℃, 18 ℃, 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃, 25 ℃, 26 ℃ or 27 ℃, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive of the specific values included 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 points between the above points are limited by space and for brevity, the invention is not exhaustive of the specific points included in the range.
Preferably, the step (3) of adding a thickening agent is further included after the mixing is finished.
As a preferred technical scheme, the preparation method comprises the following steps:
(1) mixing a dispersing agent with the conductive slurry to obtain a conductive dispersion liquid; carrying out heat treatment on the natural latex and an optional stabilizer for 3-10 h at 40-50 ℃ 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 h to obtain pre-vulcanized latex;
(3) and (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 toner 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 a conductive latex as described in the first aspect and a glove blank.
Preferably, the conductive latex glove is prepared by a method comprising: and dipping, coating anti-slip treatment, soaking and washing and co-vulcanization are carried out on the glove blank by using the conductive latex to obtain the conductive latex glove.
Preferably, the material of the glove blank comprises one or a combination of at least two of terylene, chinlon, aramid fiber, acrylic fiber, 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 the combination of natural latex, conductive slurry, a dispersing agent and a vulcanizing agent, and 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 further the conductive latex with excellent stability is obtained; and the prepared conductive latex has excellent conductivity by adjusting the dosage of each component in the formula, and the surface resistance of the conductive latex glove containing the conductive latex is 104～105.5Omega, the requirement of the product on operating a touch screen can be met, and the prepared conductive latex gloves have good wear resistance and are very comfortable to wear.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Examples 1 to 3
A conductive latex of examples 1 to 3 had a viscosity of 600 mPas, 800 mPas and 1200 mPas, respectively, and the specific components are shown in Table 1, and the unit of the amount of each component used is "parts by weight".
TABLE 1
The preparation method comprises the following steps:
(1) mixing styrene-maleic anhydride alternating copolymer (POLYSCOPE Polymer B.V, Netherlands, model SZ26080) with copper-plated carbon nanotube slurry (Beijing Deke island gold technologies Co., Ltd., model CNT813, solid content of 3%) to obtain conductive dispersion; carrying out heat treatment on natural latex (yellow spring hair), 10 mass percent of potassium hydroxide and casein at 47 ℃ for 3.5h to obtain heat-treated latex;
(2) mixing sulfur, zinc oxide, an accelerator ZDC, an accelerator BZ, an antioxidant 2246, kaolin (Shanghai Yangtze titanium white chemical product Co., Ltd.) and the heat-treated latex obtained in the step (1) at 47 ℃ for 2.5h to obtain pre-vulcanized latex with a second chloroform value;
(3) and (2) cooling the pre-vulcanized latex obtained in the step (2) to 20 ℃, mixing the cooled pre-vulcanized latex with the conductive dispersion obtained in the step (1), paraffin and blue pigment (Shanghai Hongda colorant factory, 7162A) for 30min, and adding sodium polyacrylate (Nantong Rongda textile size Co., Ltd.) to obtain the conductive latex.
Example 4
A conductive latex, which is different from example 1 in that the addition amount of a natural latex is 84 parts by weight, the addition amount of a copper-plated carbon nanotube slurry is 4 parts by weight, and other components, use amounts and preparation methods are the same as those of example 1, to obtain the conductive latex.
Example 5
A conductive latex, which is different from example 1 in that the addition amount of a natural latex is 86 parts by weight, the addition amount of a copper-plated carbon nanotube slurry is 2 parts by weight, and other components, use amounts and preparation methods are the same as those of example 1, to obtain the conductive latex.
Comparative example 1
An electrically conductive latex was obtained as described in example 1, except that no styrene-maleic anhydride alternating copolymer was added, 0.5 parts by weight of deionized water was added, and the other components, amounts and preparation methods were the same as those of example 1.
Comparative example 2
A conductive latex, which is different from example 1 in that the addition amount of a natural latex is 80 parts by weight, the addition amount of a copper-plated carbon nanotube slurry is 8 parts by weight, and other components, use amounts and preparation methods are the same as those of example 1, to obtain the conductive latex.
Comparative example 3
A conductive latex, which is different from example 1 in that the addition amount of a natural latex is 87.5 parts by weight, the addition amount of a copper-plated carbon nanotube slurry is 0.5 part by weight, and other components, use amounts and preparation methods are the same as those of example 1, to obtain the conductive latex.
Comparative example 4
A conductive latex, which is different from example 1 in that the natural latex of example 1 is replaced with a nitrile latex (model 6300, of xidi chemical ltd, townhuangdi) latex, and other components, amounts and preparation methods are the same as those of example 1, to obtain the conductive latex.
Application examples 1 to 5
A conductive latex glove, which comprises the conductive latex obtained in the examples 1-5 and a glove blank (Jiangsu Hengheng glove Co., Ltd., model 357);
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);
the preparation method is the same as the application example 1, and the conductive latex glove is obtained.
And (3) performance testing:
(1) surface resistance: testing by adopting a surface resistance tester SIMCO ST-4; the testing steps comprise: put the tester flatOn the tested object, the rubber rod at the bottom of the tester is required to be in full contact with the tested object, the red square button is pressed down, the test result is waited for, and if the test result shows 10.7, the surface resistance of the object is 1010.7Ω；
(2) Comfort level: the glove is worn by people, the glove is attached to the hand, the operation is flexible, the fingers do not feel oppressed, and the comfort level is excellent; if the rubber surface is hard, the fingers are not easy to bend or the fingers are not flexible during operation, the comfort level is poor;
(3) wear resistance: the test was carried out according to the abrasion resistance test in EN388:2016 protective gloves for protection against mechanical hazards.
The conductive latex gloves obtained according to the test application examples 1 to 5 and the comparative application examples 1 to 4 were tested, and the test data are shown in the following table:
TABLE 2
From the data in the table above, it can be seen that:
the conductive latex gloves prepared from the conductive latex provided by the invention have excellent conductivity, wearing comfort and wear resistance; specifically, the surface resistance of the conductive latex gloves provided in application examples 1 to 5 was 104～105.5Omega, the requirement of the product for operating a touch screen can be met, and the prepared conductive latex gloves have good comfort and good wear resistance; in contrast application example 1, the conductive latex prepared without adding the styrene-maleic anhydride alternating copolymer as the dispersant is creamed and flocculated by continuous stirring, so that subsequent glove preparation cannot be performed; compared with the conductive latex gloves obtained in application example 2, the conductive latex gloves have poor wear resistance due to excessive addition of the conductive slurry; the conductive latex glove obtained in comparative application example 3 has too low conductive slurry additionThe surface resistance is high, and the requirement of operating a touch screen cannot be met; the conductive latex glove obtained in comparative application example 4 had a poor hand feeling.
In conclusion, only by using the natural latex together with the conductive paste and the dispersing agent and controlling the dosage ratio of the natural latex to the conductive paste, the conductive latex gloves with excellent conductivity, wear resistance and comfort can be obtained.
The applicant states that the present invention is illustrated by the above examples of a conductive latex and a process for its preparation and application, but the present invention is not limited to the above examples, i.e. it does not mean that the present invention must be implemented by means of the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The conductive latex is characterized by comprising 80-90 parts by weight of natural latex, 2-5 parts by weight of conductive slurry, 0.3-0.7 part by weight of dispersant and 0.5-1 part by weight of vulcanizing agent.
2. The conductive latex of claim 1, wherein the viscosity of the conductive latex is 200 to 2000 mPa-s;
preferably, the solid content of the natural latex is 40-70%.
3. The conductive latex according to claim 1 or 2, wherein the surface resistance of the conductive paste is not higher than 0.003 Ω;
preferably, the conductive paste comprises any one of or a combination of at least two of metal conductive paste, carbon conductive paste or metal-carbon composite conductive paste;
preferably, the carbon-based conductive paste comprises graphene conductive paste and/or carbon nanotube conductive paste;
preferably, the metal-carbon composite conductive paste comprises any one of copper-plated graphene conductive paste, copper-plated carbon nanotube conductive paste, silver-plated graphene conductive paste or silver-plated carbon nanotube conductive paste or a combination of at least two of the copper-plated graphene conductive paste and the silver-plated carbon nanotube conductive paste;
preferably, the dispersant comprises a styrene-maleic anhydride alternating copolymer;
preferably, the molecular weight of the styrene-maleic anhydride alternating copolymer is 100000-200000 Da;
preferably, the molar ratio of the maleic anhydride monomer to the styrene monomer in the styrene-maleic anhydride alternating copolymer is 1 (1-1.5);
preferably, the vulcanizing agent comprises sulphur and/or zinc oxide;
preferably, the content of sulfur in the conductive latex is 0.3-0.65 weight part;
preferably, the content of the zinc oxide in the conductive latex is 0.2-0.35 part by weight.
4. The conductive latex according to any one of claims 1 to 3, further comprising any one or a combination of at least two of a stabilizer, an accelerator, an antioxidant, a brightener, a filler, a toner, or a thickener;
preferably, the content of the stabilizer in the conductive latex is 1-2.5 parts by weight;
preferably, the stabilizer comprises potassium hydroxide and/or casein;
preferably, the content of the potassium hydroxide in the conductive latex is 0.3-0.8 part by weight;
preferably, the content of the casein in the conductive latex is 0.7-1.7 parts by weight;
preferably, the content of the accelerator in the conductive latex is 0.2-0.3 weight part;
preferably, the content of the antioxidant in the conductive latex is 0.3-0.7 part by weight;
preferably, the content of the brightening agent in the conductive latex is 1.5-2 parts by weight;
preferably, the brightening agent comprises paraffin wax;
preferably, the content of the filler in the conductive latex is 2-2.5 parts by weight;
preferably, the filler comprises kaolin;
preferably, the content of the color enhancer in the conductive latex is 0.05-0.15 weight part;
preferably, the toner comprises a pigment;
preferably, the content of the thickening agent in the conductive latex is 4.5-5.5 parts by weight;
preferably, the thickener comprises sodium polyacrylate.
5. A process for the preparation of the electrically conductive latex according to any one of claims 1 to 4, comprising the steps of:
(1) mixing a dispersing agent with the conductive slurry to obtain a conductive dispersion liquid; heat treating a natural latex and optionally a stabilizer to obtain a 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), and pre-vulcanizing to obtain pre-vulcanized latex;
(3) and (3) cooling the pre-vulcanized latex obtained in the step (2), and mixing the pre-vulcanized latex with the conductive dispersion obtained in the step (1), an optional brightening agent and an optional coloring agent to obtain the conductive latex.
6. The preparation method according to claim 5, wherein the heat treatment time in the step (1) is 3-10 h;
preferably, the temperature of the heat treatment in the step (1) is 40-50 ℃.
7. The method according to claim 5 or 6, wherein the temperature of the mixing in the step (2) is 40 to 50 ℃;
preferably, the mixing time in the step (2) is 2-10 h;
preferably, the chloroform value of the pre-vulcanized latex in the step (2) is two to four times.
8. The preparation method according to any one of claims 5 to 7, wherein the temperature of the cooled system in the step (3) is 10 to 28 ℃;
preferably, the mixing time in the step (3) is 20-60 min;
preferably, the step (3) of adding a thickening agent is further included after the mixing is finished.
9. The method according to any one of claims 5 to 8, characterized by comprising the steps of:
(1) mixing a dispersing agent with the conductive slurry to obtain a conductive dispersion liquid; carrying out heat treatment on the natural latex and an optional stabilizer for 3-10 h at 40-50 ℃ 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 h to obtain pre-vulcanized latex;
(3) and (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 toner for 20-60 min, and adding a thickening agent to obtain the conductive latex.
10. A conductive latex glove, comprising the conductive latex according to any one of claims 1 to 4 and a glove blank;
preferably, the conductive latex glove is prepared by a method comprising: dipping, coating anti-slip treatment, soaking and washing and co-vulcanization are carried out on a glove blank by using the conductive latex to obtain the conductive latex glove;
preferably, the material of the glove blank comprises one or a combination of at least two of terylene, chinlon, aramid fiber, acrylic fiber, glass fiber, steel wire or polyethylene fiber.
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