CN112143214A - Latex gloves - Google Patents
Latex gloves Download PDFInfo
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- CN112143214A CN112143214A CN202011079592.2A CN202011079592A CN112143214A CN 112143214 A CN112143214 A CN 112143214A CN 202011079592 A CN202011079592 A CN 202011079592A CN 112143214 A CN112143214 A CN 112143214A
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- latex
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- zinc
- diisocyanate
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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
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
- C08L75/08—Polyurethanes from polyethers
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention relates to the technical field of materials, in particular to a latex glove. The latex gloves are composed of carbon dioxide-based polyether, diisocyanate, a catalyst, a chain extender, deionized water, natural rubber, sulfur, zinc dithiocarbamate, casein and strong base. The latex gloves provided by the invention have stronger performances on original tensile strength and elongation at break; even after aging treatment, the tensile strength and the elongation at break of the alloy greatly keep the original performance, and the alloy shows obvious thermal aging resistance.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a latex glove and a preparation method thereof.
Background
The natural latex, the styrene-butadiene latex and the like are widely applied as glove materials, the technical maturity is high, and the process maturity is good. But the double bonds in the chemical structure are more, the ageing and decomposition are easy, the gas/liquid permeability resistance is poor, and the method is not suitable for the fields with high requirements on heat resistance, weather resistance, air tightness and chemical resistance. .
The butyl rubber as an important synthetic rubber has the characteristics of heat resistance, ozone resistance, high air tightness and the like, the butyl latex keeps the characteristics of the butyl rubber, the mole fraction of isoprene contained in the molecular structure of the butyl latex is 1.5-2%, the molecular unsaturation degree is extremely low, and the chemical inertness is high, so that the butyl latex product has good aging resistance, ozone resistance, weather resistance, chemical medicine resistance and high air tightness. However, butyl latex cannot be produced by emulsion polymerization, and it is necessary to break up and dissolve solid butyl rubber in an organic solvent and then emulsify the butyl rubber. Therefore, butyl latex is unstable, difficult in film formation and poor in processing stability, and precipitation and emulsion breaking are easy to occur after a compounding agent is added, so that the application technology of home and abroad butyl latex has been developed for decades, but the film formation technology cannot realize industrialization.
In summary, a latex glove and a preparation method thereof which can meet the technical requirements are lacked in the prior art.
Disclosure of Invention
The invention aims to provide a latex glove and a preparation method thereof.
In order to achieve the purpose, the invention provides a latex glove which is composed of carbon dioxide-based polyether, diisocyanate, a catalyst, a chain extender, deionized water, natural rubber, sulfur, zinc dithiocarbamate, casein and strong alkali.
Preferably, the latex gloves are composed of the following raw materials in parts by weight: 80-100 parts of carbon dioxide-based polyether, 90-130 parts of diisocyanate, 3-11 parts of catalyst, 10-20 parts of chain extender, 140-160 parts of deionized water, 100-140 parts of natural rubber, 2-6 parts of sulfur, 2-5 parts of zinc dithiocarbamate, 4-8 parts of casein and 3-7 parts of strong base.
Preferably, the diisocyanate comprises one or a combination of more than two of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate and hexamethylene diisocyanate.
Preferably, the catalyst comprises one or a combination of two or more of dibutyltin dilaurate and stannous octoate.
Preferably, the chain extender comprises one or a combination of more than two of isophorone diamine (IPDA), 2-dimethylolpropionic acid (DMPA) and 2, 2-dimethylolbutyric acid (DMBA).
Preferably, the zinc dithiocarbamate comprises one or a combination of two or more of zinc di-n-butyl dithiocarbamate and zinc diethyl dithiocarbamate.
Preferably, the strong base comprises one or a combination of two or more of sodium hydroxide and potassium hydroxide.
The present invention also provides a method of making the latex glove, the method comprising the steps of:
(1) heating carbon dioxide-based polyether, diisocyanate, a catalyst and a chain extender to 90-95 ℃ to react for 90-120 min to obtain a prepolymer solution;
(2) adding deionized water into the prepolymer solution in the step (1) under the condition of high-speed stirring at 200-300 r/min for emulsification, wherein the emulsification time is 30-40 min, so as to obtain an emulsion;
(3) slowly adding natural rubber into the emulsion obtained in the step (2), uniformly stirring, and smelting at 80-90 ℃ for 1-2 h; obtaining latex solution;
(4) under the condition of 200-250 r/min, sequentially adding zinc dithiocarbamate, casein and strong base, and vulcanizing at the temperature of 60-80 ℃ for 4-6 hours to obtain a milk rubber material;
(5) and (3) heating the hand mold to 110-120 ℃ for preheating, putting the hand mold into the latex material obtained in the step (4) for dipping for 5-10 s, and after dipping, putting the hand mold into a vulcanizing box for drying, vulcanizing, molding and demolding to obtain the rubber latex material.
In some of these embodiments, the method comprises the steps of:
(1) heating carbon dioxide-based polyether, diphenylmethane diisocyanate, dibutyltin dilaurate and isophorone diamine to 90 ℃ to react for 120min to obtain a prepolymer solution;
(2) adding deionized water into the prepolymer solution in the step (1) under the condition of high-speed stirring at 200r/min for emulsification, wherein the emulsification time is 40min, so as to obtain an emulsion;
(3) slowly adding natural rubber into the emulsion obtained in the step (2), uniformly stirring, and smelting at 80 ℃ for 2 h; obtaining latex solution;
(4) under the condition of 200r/min, sequentially adding zinc di-n-butyldithiocarbamate, zinc diethyldithiocarbamate, casein and potassium hydroxide, and vulcanizing at 60 ℃ for 6 hours to obtain a latex material;
(5) and (3) heating the hand mold to 110 ℃ for preheating, putting the hand mold into the latex material obtained in the step (4) for dipping for 5s, and after dipping, putting the dipped latex material into a vulcanizing box for drying, vulcanizing, molding and demolding to obtain the rubber latex material.
In some of these embodiments, the method comprises the steps of:
(1) heating carbon dioxide-based polyether, diphenylmethane diisocyanate, dibutyltin dilaurate and isophorone diamine to 95 ℃ to react for 90min to obtain a prepolymer solution;
(2) adding deionized water into the prepolymer solution in the step (1) under the condition of high-speed stirring at 300r/min for emulsifying for 30min to obtain an emulsion;
(3) slowly adding natural rubber into the emulsion obtained in the step (2), uniformly stirring, and smelting at 90 ℃ for 1 h; obtaining latex solution;
(4) under the condition of 250r/min, sequentially adding zinc di-n-butyldithiocarbamate, zinc diethyldithiocarbamate, casein and potassium hydroxide, and vulcanizing at 80 ℃ for 4 hours to obtain a latex material;
(5) and (3) heating the hand mould to 120 ℃ for preheating, putting the hand mould into the latex material obtained in the step (4) for dipping for 10s, and after dipping, putting the hand mould into a vulcanizing box for drying, vulcanizing, molding and demoulding to obtain the rubber latex material.
Compared with the prior art, the invention has the following beneficial effects:
1. the latex gloves provided by the invention have stronger performances on original tensile strength and elongation at break; even after aging treatment, the tensile strength and the elongation at break of the alloy greatly keep the original performance, and the alloy shows obvious thermal aging resistance.
2. The preparation method of the latex gloves provided by the invention is simple and feasible, the raw materials are easy to obtain, the price is low, the requirement on equipment is not high, and the latex gloves are suitable for large-scale production.
Detailed Description
Example 1:
the specific raw materials were weighed as in table 1, and the preparation steps were as follows:
(1) heating carbon dioxide-based polyether, diphenylmethane diisocyanate, dibutyltin dilaurate and isophorone diamine to 90 ℃ to react for 120min to obtain a prepolymer solution;
(2) adding deionized water into the prepolymer solution in the step (1) under the condition of high-speed stirring at 200r/min for emulsification, wherein the emulsification time is 40min, so as to obtain an emulsion;
(3) slowly adding natural rubber into the emulsion obtained in the step (2), uniformly stirring, and smelting at 80 ℃ for 2 h; obtaining latex solution;
(4) under the condition of 200r/min, sequentially adding zinc di-n-butyldithiocarbamate, zinc diethyldithiocarbamate, casein and potassium hydroxide, and vulcanizing at 60 ℃ for 6 hours to obtain a latex material;
(5) and (3) heating the hand mold to 110 ℃ for preheating, putting the hand mold into the latex material obtained in the step (4) for dipping for 5s, and after dipping, putting the dipped latex material into a vulcanizing box for drying, vulcanizing, molding and demolding to obtain the rubber latex material.
Example 2:
(1) heating carbon dioxide-based polyether, diphenylmethane diisocyanate, dibutyltin dilaurate and isophorone diamine to 95 ℃ to react for 90min to obtain a prepolymer solution;
(2) adding deionized water into the prepolymer solution in the step (1) under the condition of high-speed stirring at 300r/min for emulsifying for 30min to obtain an emulsion;
(3) slowly adding natural rubber into the emulsion obtained in the step (2), uniformly stirring, and smelting at 90 ℃ for 1 h; obtaining latex solution;
(4) under the condition of 250r/min, sequentially adding zinc di-n-butyldithiocarbamate, zinc diethyldithiocarbamate, casein and potassium hydroxide, and vulcanizing at 80 ℃ for 4 hours to obtain a latex material;
(5) and (3) heating the hand mould to 120 ℃ for preheating, putting the hand mould into the latex material obtained in the step (4) for dipping for 10s, and after dipping, putting the hand mould into a vulcanizing box for drying, vulcanizing, molding and demoulding to obtain the rubber latex material.
Example 3:
(1) heating carbon dioxide-based polyether, diphenylmethane diisocyanate, dibutyltin dilaurate and isophorone diamine to 95 ℃ to react for 120min to obtain a prepolymer solution;
(2) adding deionized water into the prepolymer solution in the step (1) under the condition of high-speed stirring at 300r/min for emulsification, wherein the emulsification time is 40min, so as to obtain an emulsion;
(3) slowly adding natural rubber into the emulsion obtained in the step (2), uniformly stirring, and smelting at 90 ℃ for 2 h; obtaining latex solution;
(4) under the condition of 250r/min, sequentially adding zinc di-n-butyldithiocarbamate, zinc diethyldithiocarbamate, casein and potassium hydroxide, and vulcanizing at 80 ℃ for 4 hours to obtain a latex material;
(5) and (3) heating the hand mould to 120 ℃ for preheating, putting the hand mould into the latex material obtained in the step (4) for dipping for 10s, and after dipping, putting the hand mould into a vulcanizing box for drying, vulcanizing, molding and demoulding to obtain the rubber latex material.
Comparative example 1:
(1) heating carbon dioxide-based polyether, diphenylmethane diisocyanate, dibutyltin dilaurate and isophorone diamine to 95 ℃ to react for 120min to obtain a prepolymer solution;
(2) adding deionized water into the prepolymer solution in the step (1) under the condition of high-speed stirring at 300r/min for emulsification, wherein the emulsification time is 40min, so as to obtain an emulsion;
(3) slowly adding natural rubber into the emulsion obtained in the step (2), uniformly stirring, and smelting at 90 ℃ for 2 h; obtaining latex solution;
(4) under the condition of 250r/min, sequentially adding zinc di-n-butyldithiocarbamate, zinc diethyldithiocarbamate, casein and potassium hydroxide, and vulcanizing at 80 ℃ for 4 hours to obtain a latex material;
(5) and (3) heating the hand mould to 120 ℃ for preheating, putting the hand mould into the latex material obtained in the step (4) for dipping for 10s, and after dipping, putting the hand mould into a vulcanizing box for drying, vulcanizing, molding and demoulding to obtain the rubber latex material.
Comparative example 2:
(1) mixing natural rubber and butyl latex uniformly, and smelting at 90 ℃ for 2 h; obtaining latex solution;
(2) under the condition of 250r/min, sequentially adding zinc di-n-butyldithiocarbamate, zinc diethyldithiocarbamate, casein and potassium hydroxide, and vulcanizing at 80 ℃ for 4 hours to obtain a latex material;
(3) and (3) heating the hand mould to 120 ℃ for preheating, putting the hand mould into the latex material obtained in the step (4) for dipping for 10s, and after dipping, putting the hand mould into a vulcanizing box for drying, vulcanizing, molding and demoulding to obtain the rubber latex material.
TABLE 1
Example 4 glove performance testing:
respectively testing the performance items of tensile strength, elongation at break, strength retention rate after aging, elongation at break and the like of the latex gloves prepared in the examples 1 to 3 and the comparative examples 1 to 2; the test results are shown in Table 2.
TABLE 2 glove Performance test results
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (9)
1. The latex gloves are characterized by comprising the following raw materials in parts by weight: 80-100 parts of carbon dioxide-based polyether, 90-130 parts of diisocyanate, 3-11 parts of catalyst, 10-20 parts of chain extender, 140-160 parts of deionized water, 100-140 parts of natural rubber, 2-6 parts of sulfur, 2-5 parts of zinc dithiocarbamate, 4-8 parts of casein and 3-7 parts of strong base.
2. The latex glove of claim 1, wherein said diisocyanate comprises one or a combination of two or more of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, and hexamethylene diisocyanate.
3. The latex glove of claim 1 wherein said catalyst comprises one or a combination of two or more of dibutyltin dilaurate and stannous octoate.
4. The latex glove of claim 1, wherein the chain extender comprises one or a combination of two or more of isophorone diamine (IPDA), 2-dimethylolpropionic acid (DMPA), and 2, 2-dimethylolbutyric acid (DMBA).
5. The latex glove according to claim 1, wherein said zinc dithiocarbamate comprises one or a combination of two or more of zinc di-n-butyldithiocarbamate and zinc diethyldithiocarbamate.
6. The latex glove of claim 1, wherein said strong base comprises one or a combination of two or more of sodium hydroxide and potassium hydroxide.
7. A method of making the latex glove of any of claims 1-6, comprising the steps of:
(1) heating carbon dioxide-based polyether, diisocyanate, a catalyst and a chain extender to 90-95 ℃ to react for 90-120 min to obtain a prepolymer solution.
(2) And (2) adding deionized water into the prepolymer solution in the step (1) under the condition of high-speed stirring at 200-300 r/min for emulsifying for 30-40 min to obtain the emulsion.
(3) Slowly adding natural rubber into the emulsion obtained in the step (2), uniformly stirring, and smelting at 80-90 ℃ for 1-2 h; obtaining the latex solution.
(4) Under the condition of 200-250 r/min, zinc dithiocarbamate, casein and strong base are sequentially added, and vulcanization is carried out for 4-6 h at the temperature of 60-80 ℃ to obtain the milk rubber material.
(5) And (3) heating the hand mold to 110-120 ℃ for preheating, putting the hand mold into the latex material obtained in the step (4) for dipping for 5-10 s, and after dipping, putting the hand mold into a vulcanizing box for drying, vulcanizing, molding and demolding to obtain the rubber latex material.
8. The method according to claim 7, characterized in that it comprises the steps of:
(1) heating carbon dioxide-based polyether, diphenylmethane diisocyanate, dibutyltin dilaurate and isophorone diamine to 90 ℃ to react for 120min to obtain a prepolymer solution;
(2) adding deionized water into the prepolymer solution in the step (1) under the condition of high-speed stirring at 200r/min for emulsification, wherein the emulsification time is 40min, so as to obtain an emulsion;
(3) slowly adding natural rubber into the emulsion obtained in the step (2), uniformly stirring, and smelting at 80 ℃ for 2 h; obtaining latex solution;
(4) under the condition of 200r/min, sequentially adding zinc di-n-butyldithiocarbamate, zinc diethyldithiocarbamate, casein and potassium hydroxide, and vulcanizing at 60 ℃ for 6 hours to obtain a latex material;
(5) and (3) heating the hand mold to 110 ℃ for preheating, putting the hand mold into the latex material obtained in the step (4) for dipping for 5s, and after dipping, putting the dipped latex material into a vulcanizing box for drying, vulcanizing, molding and demolding to obtain the rubber latex material.
9. The method according to claim 7, characterized in that it comprises the steps of:
(1) heating carbon dioxide-based polyether, diphenylmethane diisocyanate, dibutyltin dilaurate and isophorone diamine to 95 ℃ to react for 90min to obtain a prepolymer solution;
(2) adding deionized water into the prepolymer solution in the step (1) under the condition of high-speed stirring at 300r/min for emulsifying for 30min to obtain an emulsion;
(3) slowly adding natural rubber into the emulsion obtained in the step (2), uniformly stirring, and smelting at 90 ℃ for 1 h; obtaining latex solution;
(4) under the condition of 250r/min, sequentially adding zinc di-n-butyldithiocarbamate, zinc diethyldithiocarbamate, casein and potassium hydroxide, and vulcanizing at 80 ℃ for 4 hours to obtain a latex material;
(5) and (3) heating the hand mould to 120 ℃ for preheating, putting the hand mould into the latex material obtained in the step (4) for dipping for 10s, and after dipping, putting the hand mould into a vulcanizing box for drying, vulcanizing, molding and demoulding to obtain the rubber latex material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011079592.2A CN112143214A (en) | 2020-10-10 | 2020-10-10 | Latex gloves |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011079592.2A CN112143214A (en) | 2020-10-10 | 2020-10-10 | Latex gloves |
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| CN112143214A true CN112143214A (en) | 2020-12-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114103317A (en) * | 2021-11-15 | 2022-03-01 | 南京润京乳胶制品有限公司 | Composite material for breathable medical latex gloves and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114103317A (en) * | 2021-11-15 | 2022-03-01 | 南京润京乳胶制品有限公司 | Composite material for breathable medical latex gloves and preparation method thereof |
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Application publication date: 20201229 |