CN112194807A - A method for preparing latex film based on demulsification induced curing technology - Google Patents
A method for preparing latex film based on demulsification induced curing technology Download PDFInfo
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- CN112194807A CN112194807A CN201910608652.6A CN201910608652A CN112194807A CN 112194807 A CN112194807 A CN 112194807A CN 201910608652 A CN201910608652 A CN 201910608652A CN 112194807 A CN112194807 A CN 112194807A
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- 229920000126 latex Polymers 0.000 title claims abstract description 70
- 239000004816 latex Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005516 engineering process Methods 0.000 title claims abstract description 13
- 239000000839 emulsion Substances 0.000 claims abstract description 44
- 229920002635 polyurethane Polymers 0.000 claims abstract description 13
- 239000004814 polyurethane Substances 0.000 claims abstract description 13
- 239000004020 conductor Substances 0.000 claims abstract description 11
- 230000008023 solidification Effects 0.000 claims abstract 5
- 238000007711 solidification Methods 0.000 claims abstract 5
- 238000004073 vulcanization Methods 0.000 claims description 21
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 claims description 19
- 238000001035 drying Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 244000043261 Hevea brasiliensis Species 0.000 claims description 15
- 229920003052 natural elastomer Polymers 0.000 claims description 15
- 229920001194 natural rubber Polymers 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 8
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 7
- 150000002500 ions Chemical class 0.000 claims description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- KSZVHVUMUSIKTC-UHFFFAOYSA-N acetic acid;propan-2-one Chemical compound CC(C)=O.CC(O)=O KSZVHVUMUSIKTC-UHFFFAOYSA-N 0.000 claims description 5
- 229920002301 cellulose acetate Polymers 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000007598 dipping method Methods 0.000 claims description 5
- 229920000191 poly(N-vinyl pyrrolidone) Polymers 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims 2
- 239000004614 Process Aid Substances 0.000 claims 1
- 239000002270 dispersing agent Substances 0.000 claims 1
- 230000005611 electricity Effects 0.000 claims 1
- 229910052755 nonmetal Inorganic materials 0.000 claims 1
- 238000003672 processing method Methods 0.000 claims 1
- 239000008234 soft water Substances 0.000 claims 1
- 239000003381 stabilizer Substances 0.000 claims 1
- 239000011787 zinc oxide Substances 0.000 claims 1
- 229920006173 natural rubber latex Polymers 0.000 abstract description 31
- 239000002904 solvent Substances 0.000 abstract description 3
- 230000008021 deposition Effects 0.000 abstract 2
- 239000003792 electrolyte Substances 0.000 abstract 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 1
- 239000001257 hydrogen Substances 0.000 abstract 1
- -1 hydrogen ions Chemical class 0.000 abstract 1
- 229910021645 metal ion Inorganic materials 0.000 abstract 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 56
- 239000007787 solid Substances 0.000 description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 28
- 229910021529 ammonia Inorganic materials 0.000 description 28
- 239000003292 glue Substances 0.000 description 27
- 238000002360 preparation method Methods 0.000 description 23
- 235000014113 dietary fatty acids Nutrition 0.000 description 14
- 239000000194 fatty acid Substances 0.000 description 14
- 229930195729 fatty acid Natural products 0.000 description 14
- 150000004665 fatty acids Chemical class 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- KEQXNNJHMWSZHK-UHFFFAOYSA-L 1,3,2,4$l^{2}-dioxathiaplumbetane 2,2-dioxide Chemical compound [Pb+2].[O-]S([O-])(=O)=O KEQXNNJHMWSZHK-UHFFFAOYSA-L 0.000 description 13
- 238000003756 stirring Methods 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 238000013329 compounding Methods 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229920005597 polymer membrane Polymers 0.000 description 5
- 229920005749 polyurethane resin Polymers 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010790 dilution Methods 0.000 description 4
- 239000012895 dilution Substances 0.000 description 4
- 229920006254 polymer film Polymers 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000008346 aqueous phase Substances 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000000560 biocompatible material Substances 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000000707 layer-by-layer assembly Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D9/00—Electrolytic coating other than with metals
- C25D9/02—Electrolytic coating other than with metals with organic materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2307/00—Characterised by the use of natural rubber
- C08J2307/02—Latex
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Electrochemistry (AREA)
- Metallurgy (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
本发明提供一种基于破乳诱导固化技术制备乳胶薄膜的方法。在接通电源的情况下，基于破乳诱导固化技术，利用天然橡胶乳液和聚氨酯乳胶作为电解液，在阳极导电材料表面产生的金属离子或氢离子诱导乳液破乳，进一步固化制备超薄乳胶膜。通过调节沉积时间，沉积电压和电极距离的不同，可以精确控制乳胶膜厚度，在阳极导电材料上得到的乳胶膜厚度为1–1000μm。本发明的在阳极导电材料上制得乳胶膜，成膜速度快，无需完成溶剂在空气中长时间放置从而挥发成膜过程，减少了成膜时间，提高了成膜效率。本发明成本低廉，工艺简单，条件温和，不会对操作者造成危害。The invention provides a method for preparing latex film based on demulsification induced solidification technology. When the power is turned on, based on the demulsification-induced curing technology, using natural rubber latex and polyurethane latex as electrolytes, metal ions or hydrogen ions generated on the surface of the anode conductive material induce demulsification of the emulsion, and further solidify to prepare an ultra-thin latex film . By adjusting the deposition time, deposition voltage and electrode distance, the thickness of the latex film can be precisely controlled, and the thickness of the latex film obtained on the anode conductive material is 1–1000 μm. The latex film prepared on the anode conductive material of the present invention has a fast film-forming speed, does not need to complete the process of the solvent being placed in the air for a long time to volatilize the film-forming process, reduces the film-forming time and improves the film-forming efficiency. The invention has the advantages of low cost, simple process, mild conditions and no harm to operators.
Description
Technical Field
The invention belongs to the technical field of membrane preparation, and particularly relates to a method for preparing a latex membrane based on a demulsification induction curing technology.
Background
Polymer film materials are one of the most remarkable and most research-requiring fields in recent years in academia and industry. The polymer film material becomes the basis of a function integrated material due to adjustable parameters such as thickness, composition, structure and function, and has important application in the fields of biocompatible materials, optical materials, wearable materials, flexible devices and the like. With the development of science and technology, the preparation methods of polymer film materials, such as layer-by-layer assembly, hot pressing, blow molding and film forming, are also continuously developed. The organic solvent is a substance commonly used in the preparation process of the polymer membrane material, and is easy to pollute the environment and harm operators. Therefore, the method for preparing the polymer membrane material by using an aqueous phase without using any organic solvent has wide market prospect and important significance. The polymer membrane material has different compositions, structures and functions, and has important application values in a plurality of fields. Under the large background that environmental protection is more and more emphasized in all social circles, the preparation method of the polymer membrane material is developed in the water phase through chemical synthesis and molecular design methods to realize controllable and rapid interface curing, and has important significance for the development of the polymer membrane material field.
According to the method for preparing the latex film by ion-induced demulsification, the thickness of the latex film can be accurately controlled, the film forming speed is high, the solvent does not need to be placed in the air for a long time so as to volatilize the film forming process, the film forming time is shortened, and the film forming efficiency is improved. The method has the advantages of low cost, simple process, mild condition, no harm to operators and quite wide development prospect.
Disclosure of Invention
In order to solve the problems of the prior art, the invention provides a method for preparing a latex film based on a demulsification induction curing technology.
The invention provides a method for preparing a latex film by ion-induced demulsification, which comprises the following steps and conditions:
1. two kinds of emulsion are used, wherein one kind of the emulsion is natural rubber latex, and the other kind of the emulsion is water-based polyurethane, and the two kinds of the emulsion are industrial commercial products, and the specific model parameters are as follows:
(1) natural rubber latex
The natural rubber latex is three-tree card 300 imported from Thailand#High ammonia natural latex, various technical indexes of latex, average total solid 61.5%, dry rubber content 602%, the difference between the total solid content and the dry glue is 1.3%, the ammonia content is 0.72%, the volatile fatty acid value is 0.04%, the mechanical stability is 650 seconds, and the product is milky white.
(2) Aqueous polyurethane emulsion
The waterborne polyurethane resin is purchased from Anhui Hefei city of Andamai Huatai brand, the product number is AH-1502, the national standard is met, the solid content is more than or equal to 35 percent, and the density is 1.06 +/-0.02 (g/cm)3)
2. Sacrificial layer method electrode treatment
Preparing 10% cellulose acetate acetone solution, coating or dipping on the surface of the positive electrode, and drying for 30 minutes to form a uniform film on the surface of the electrode. And then placing the electrodes in a volume ratio of 1: 1 mixture of water and absolute ethyl alcohol, and heating at 80 ℃ for 40 minutes.
The electrode thus treated is easily peeled off after the latex film is prepared, and forms a self-supporting latex film.
3. Natural latex prevulcanization treatment
A concentrated latex having a dry gel weight of 300g was weighed into a clean 1000mL aluminum kettle and formulated to add 20% potassium hydroxide solution and 20% peregal "O" solution, 50% sulfur dispersion, 50% ZDC dispersion and 40% zinc oxide dispersion with stirring. And then, cleaning a container containing the compounding agents by using dilution water listed in the formula, adding the container into the compounding latex, uniformly stirring, placing the mixture into a constant-temperature water bath, and heating to the required vulcanization temperature, wherein the heating time is controlled to be about 50 min. When the temperature rises to the vulcanization temperature, the temperature is kept. And preserving the temperature to the required vulcanization degree, and rapidly cooling to obtain the prevulcanized latex. Stirring is kept continuously during the whole vulcanization process. The above vulcanization aids are all industrial commercial products
4. Preparation of latex film by primary cell method
Under the condition of no power supply, two electrodes made of conductive materials with different potentials are connected and placed in a container filled with emulsion to form a primary battery, and a membrane material with a compact structure is obtained through the demulsification effect of ions. The thickness of the deposit needs to be controlled by increasing the soaking time.
5. Preparation of electro-latex film
At room temperature, two conductive electrodes are placed in a container containing natural rubber emulsion (or containing an auxiliary agent) or polyurethane emulsion, the distance between the two conductive electrodes is 0.5-5cm, a power supply is switched on, the voltage of the power supply is adjusted to be 0.2-15V, the power-on time is 5-6000 s, then the power is cut off, the electrodes are taken out for rinsing, and after drying, a layer of emulsion film is obtained on the surface of the anode metal.
Has the advantages that: the invention provides a method for preparing a latex film based on a demulsification induction curing technology, which has the advantages that the thickness of the latex film can be accurately controlled, the film forming speed is high, the solvent is not required to be placed in the air for a long time so as to volatilize the film forming process, the film forming time is shortened, and the film forming efficiency is improved. The method has the advantages of low cost, simple process, mild conditions and no harm to operators. The method is widely applied to various fields such as industry, medical treatment, optics and the like, and has quite wide development prospect.
Detailed Description
The following examples are presented to further illustrate the practice and results of the invention and are not intended to limit the invention thereto.
Example 1
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Preparation of electro-latex film
At room temperature, two 2 x 3cm zinc sheet electrodes are placed in a container filled with natural rubber emulsion, the two conductive electrodes are separated by 2cm, a power supply is switched on, the voltage of the power supply is adjusted to be 5V, the power-on time is 300s, then the power supply is cut off, the electrodes are taken out for rinsing, and after drying, a latex film with the thickness of 516 micrometers is obtained on the surface of the anode metal.
Example 2
(1) The specific model parameters of the aqueous polyurethane emulsion are as follows:
waterborne polyurethane resin purchased from Anhui Hefei city Anda huatai brandThe product number is AH-1502, which meets the national standard, the solid content is more than or equal to 35 percent, and the density is 1.06 +/-0.02 (g/cm)3)
(2) Preparation of electro-latex film
At room temperature, two 2 x 3cm copper sheet electrodes are placed in a container containing the aqueous polyurethane emulsion, the two conductive electrodes are spaced by 2cm, a power supply is switched on, the voltage of the power supply is adjusted to be 5V, the power-on time is 240s, then the power supply is switched off, the electrodes are taken out for rinsing, and after drying, a latex film with the thickness of 368 mu m is obtained on the surface of the anode metal.
Example 3
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Natural latex prevulcanization treatment
A concentrated latex having a dry gel weight of 300g was weighed into a clean 1000mL aluminum kettle and formulated to add 20% potassium hydroxide solution and 20% peregal "O" solution, 50% sulfur dispersion, 50% ZDC dispersion and 40% zinc oxide dispersion with stirring. And then, cleaning a container containing the compounding agents by using dilution water listed in the formula, adding the container into the compounding latex, uniformly stirring, placing the mixture into a constant-temperature water bath, and heating to the required vulcanization temperature, wherein the heating time is controlled to be about 50 min. When the temperature rises to the vulcanization temperature, the temperature is kept. And preserving the temperature to the required vulcanization degree, and rapidly cooling to obtain the prevulcanized latex. Stirring is kept continuously during the whole vulcanization process. The above vulcanization aids are all industrial commercial products
(3) Preparation of electro-latex film
At room temperature, two iron rod-shaped electrodes with the diameter of 1mm and the length of 3cm are placed in a container filled with natural rubber pre-vulcanized emulsion, the distance between the two conductive electrodes is 1cm, the power supply is switched on, the power supply voltage is adjusted to be 2V, the power-on time is 180s, then the power is cut off, the electrodes are taken out, the electrodes are rinsed, and after the electrodes are dried, a latex film with the thickness of 76 microns is obtained on the surface of the anode metal.
Example 4
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Sacrificial layer method electrode treatment
Preparing 10% cellulose acetate acetone solution, dipping the solution on the surface of a 3cm iron rod electrode with the diameter of 1mm, and drying the solution for 30 minutes to form a uniform film on the surface of the electrode. And then placing the electrodes in a volume ratio of 1: 1 mixture of water and absolute ethyl alcohol, and heating at 80 ℃ for 40 minutes.
(3) Natural latex prevulcanization treatment
A concentrated latex having a dry gel weight of 300g was weighed into a clean 1000mL aluminum kettle and formulated to add 20% potassium hydroxide solution and 20% peregal "O" solution, 50% sulfur dispersion, 50% ZDC dispersion and 40% zinc oxide dispersion with stirring. And then, cleaning a container containing the compounding agents by using dilution water listed in the formula, adding the container into the compounding latex, uniformly stirring, placing the mixture into a constant-temperature water bath, and heating to the required vulcanization temperature, wherein the heating time is controlled to be about 50 min. When the temperature rises to the vulcanization temperature, the temperature is kept. And preserving the temperature to the required vulcanization degree, and rapidly cooling to obtain the prevulcanized latex. Stirring is kept continuously during the whole vulcanization process. The above vulcanization aids are all industrial commercial products
(4) Preparation of electro-latex film
At room temperature, the iron rod electrode treated by the sacrificial method is placed in a container filled with natural rubber pre-vulcanized emulsion, the two conductive electrodes are separated by 0.5cm, the power supply is switched on, the power supply voltage is adjusted to be 0.5V, the power-on time is 120s, then the power is cut off, the electrode is taken out, the electrode is rinsed and dried, and then a layer of 8-micron emulsion film is obtained on the surface of the anode metal.
Example 5
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Sacrificial layer method electrode treatment
Preparing 10% cellulose acetate acetone solution, dipping the solution on the surface of a 3cm iron rod electrode with the diameter of 1mm, and drying the solution for 30 minutes to form a uniform film on the surface of the electrode. And then placing the electrodes in a volume ratio of 1: 1 mixture of water and absolute ethyl alcohol, and heating at 80 ℃ for 40 minutes.
(3) Preparation of electro-latex film
At room temperature, the iron rod electrode treated by the sacrificial method is placed in a container containing natural rubber emulsion, the distance between two conductive electrodes is 1.5cm, a power supply is switched on, the voltage of the power supply is adjusted to be 5V, the power-on time is 120s, then the power is cut off, the electrode is taken out and rinsed, and after drying, a layer of emulsion film with the thickness of 76 mu m is obtained on the surface of the anode metal.
Example 6
(1) The specific model parameters of the aqueous polyurethane emulsion are as follows:
the waterborne polyurethane resin is purchased from Anhui Hefei city of Andamai Huatai brand, the product number is AH-1502, the national standard is met, the solid content is more than or equal to 35 percent, and the density is 1.06 +/-0.02 (g/cm)3)
(2) Sacrificial layer method electrode treatment
Preparing 10% cellulose acetate acetone solution, dipping the solution on the surface of a 3cm iron rod electrode with the diameter of 1mm, and drying the solution for 30 minutes to form a uniform film on the surface of the electrode. And then placing the electrodes in a volume ratio of 1: 1 mixture of water and absolute ethyl alcohol, and heating at 80 ℃ for 40 minutes.
(3) Preparation of electro-latex film
At room temperature, the iron rod electrode treated by the sacrificial method is placed in a container containing aqueous polyurethane emulsion, the distance between two conductive electrodes is 1.5cm, a power supply is switched on, the voltage of the power supply is adjusted to be 3V, the power-on time is 50s, then the power is cut off, the electrode is taken out and rinsed, and after drying, a layer of 34-micron emulsion film is obtained on the surface of the anode metal.
Example 7
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Preparation of latex film by primary cell method
Under the condition of no power supply, a copper wire with the diameter of 1mm is connected with an iron wire, the copper wire and the iron wire are placed in a container containing natural rubber latex to form a primary battery, and the primary battery is soaked for 60s to obtain a 10-micron latex film.
Example 8
(1) The specific model parameters of the aqueous polyurethane emulsion are as follows:
the waterborne polyurethane resin is purchased from Anhui Hefei city of Andamai Huatai brand, the product number is AH-1502, the national standard is met, the solid content is more than or equal to 35 percent, and the density is 1.06 +/-0.02 (g/cm)3)
(2) Preparation of latex film by primary cell method
Under the condition of no power supply, a copper wire with the diameter of 1mm is connected with an iron wire, the copper wire and the iron wire are placed in a container containing the aqueous polyurethane emulsion to form a primary battery, and the primary battery is soaked for 90s to obtain a 14-micron emulsion film.
Example 9
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Natural latex prevulcanization treatment
A concentrated latex having a dry gel weight of 300g was weighed into a clean 1000mL aluminum kettle and formulated to add 20% potassium hydroxide solution and 20% peregal "O" solution, 50% sulfur dispersion, 50% ZDC dispersion and 40% zinc oxide dispersion with stirring. And then, cleaning a container containing the compounding agents by using dilution water listed in the formula, adding the container into the compounding latex, uniformly stirring, placing the mixture into a constant-temperature water bath, and heating to the required vulcanization temperature, wherein the heating time is controlled to be about 50 min. When the temperature rises to the vulcanization temperature, the temperature is kept. And preserving the temperature to the required vulcanization degree, and rapidly cooling to obtain the prevulcanized latex. Stirring is kept continuously during the whole vulcanization process. The above vulcanization aids are all industrial commercial products
(3) Preparation of latex film by primary cell method
Under the condition of no power supply, a copper wire with the diameter of 1mm is connected with an iron wire, the copper wire and the iron wire are placed in a container containing natural rubber pre-vulcanized latex to form a primary battery, and the primary battery is soaked for 90s to obtain a 12-micron latex film.
Example 10
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Preparation of electro-latex film
At room temperature, two aluminum sheet electrodes of 2 x 3cm are placed in a container filled with natural rubber emulsion, the two conductive electrodes are separated by 2cm, the power supply is switched on, the power supply voltage is adjusted to be 5V, the power-on time is 300s, then the power supply is switched off, the electrodes are taken out for rinsing, and after drying, a latex film with the thickness of 516 micrometers is obtained on the surface of the anode metal.
Example 11
(1) The specific model parameters of the aqueous polyurethane emulsion are as follows:
the waterborne polyurethane resin is purchased from Anhui Hefei city of Andamai Huatai brand, the product number is AH-1502, the national standard is met, the solid content is more than or equal to 35 percent, and the density is 1.06 +/-0.02 (g/cm)3)
(2) Preparation of electro-latex film
At room temperature, two graphite sheet electrodes of 2 x 3cm are placed in a container filled with aqueous polyurethane emulsion, the distance between the two conductive electrodes is 0.5cm, the power supply is switched on, the power supply voltage is adjusted to be 3V, the power-on time is 180s, then the power supply is cut off, the electrodes are taken out for rinsing, and after drying, a latex film with the thickness of 26 microns is obtained on the metal surface of the anode.
Example 12
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Preparation of electro-latex film
At room temperature, two copper sheet electrodes of 2 x 3cm are placed in a container filled with natural rubber emulsion, the two conductive electrodes are separated by 2cm, a power supply is switched on, the voltage of the power supply is adjusted to be 0.3V, the power-on time is 40s, then the power is cut off, the electrodes are taken out for rinsing, and after drying, an emulsion film with the thickness of 4 microns is obtained on the surface of the anode metal.
Example 13
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Preparation of electro-latex film
At room temperature, two 2 x 3cm iron sheet electrodes are placed in a container filled with natural rubber emulsion, the two conductive electrodes are separated by 2cm, a power supply is switched on, the voltage of the power supply is adjusted to be 0.2V, the power-on time is 20s, then the power is cut off, the electrodes are taken out for rinsing, and after drying, a latex film with the thickness of 1 micron is obtained on the surface of the anode metal.
Example 14
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Preparation of electro-latex film
At room temperature, two 2 x 3cm zinc sheet electrodes are placed in a container filled with natural rubber emulsion, the two conductive electrodes are separated by 2cm, a power supply is switched on, the voltage of the power supply is adjusted to be 0.5V, the power-on time is 20s, then the power is cut off, the electrodes are taken out for rinsing, and after drying, a latex film with the thickness of 5 microns is obtained on the metal surface of the anode.
Example 15
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Preparation of electro-latex film
At room temperature, two 2 x 3cm zinc sheet electrodes are placed in a container filled with natural rubber emulsion, the two conductive electrodes are separated by 2cm, a power supply is switched on, the voltage of the power supply is adjusted to be 0.1V, the power-on time is 300s, then the power is cut off, the electrodes are taken out for rinsing, and after drying, a latex film with the thickness of 3 microns is obtained on the metal surface of the anode.
Example 16
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Preparation of electro-latex film
At room temperature, two 2 x 3cm zinc sheet electrodes are placed in a container filled with natural rubber emulsion, the two conductive electrodes are separated by 2cm, a power supply is switched on, the voltage of the power supply is adjusted to be 5V, the power-on time is 10s, then the power supply is cut off, the electrodes are taken out for rinsing, and after drying, a latex film with the thickness of 27 microns is obtained on the surface of the anode metal.
Example 17
(1) The specific model parameters of the used natural rubber latex are as follows:
the natural rubber latex is three-tree card 300 imported from Thailand#The high ammonia natural latex has the technical indexes of 61.5 percent of average total solid content, 60.2 percent of dry glue content, 1.3 percent of difference between the total solid content and the dry glue content, 0.72 percent of ammonia content, 0.04 percent of volatile fatty acid value, 650 seconds of mechanical stability and milk white color.
(2) Preparation of electro-latex film
At room temperature, two 2 x 3cm zinc sheet electrodes are placed in a container filled with natural rubber emulsion, the two conductive electrodes are separated by 2cm, a power supply is switched on, the voltage of the power supply is adjusted to be 15V, the power-on time is 24h, then the power supply is cut off, the electrodes are taken out for rinsing, and after drying, an emulsion film with the thickness of 867 microns is obtained on the surface of the anode metal.
Claims (9)
1. A method for preparing a latex film based on a demulsification induction curing technology is characterized by comprising the following steps and conditions:
two electrodes of conductive material are immersed in a container containing the emulsion. Ions are generated by applying a voltage to the electrodes. The membrane material with a compact structure is obtained through the demulsification of ions.
2. The method for preparing the latex film based on the demulsification-induced solidification technology as claimed in claim 1, wherein the steps and conditions are as follows:
the emulsion material used generally means a raw material of a film material suitable for use in daily life, such as natural emulsions represented by natural latex, and synthetic emulsions represented by aqueous polyurethane emulsions.
3. The method for preparing the latex film based on the demulsification-induced solidification technology as claimed in claim 1, wherein the steps and conditions are as follows:
the raw materials used contain not only the substances described in claim 1 but also the relevant auxiliaries. Taking natural rubber as an example, vulcanization process aids such as stabilizers: potassium hydroxide, dispersant: peregal "O", vulcanizing agent: sulfur, rubber accelerator: assistant including ZDC promoter, zinc oxide, soft water, etc. may be added in batches to obtain membrane material with excellent mechanical performance.
4. The method for preparing the latex film based on the demulsification-induced solidification technology as claimed in claim 1, wherein the steps and conditions are as follows:
the electrodes used were: the conductive material can conduct electricity, the material, the shape and the size of the conductive material are not limited, and the surface can be polished if needed. It is also possible to coat the surface with a sacrificial layer to obtain a material that is independent of the self-support of the electrode. The electrode is made of metal, and non-metal conductive substances such as graphite can be used.
5. The method for preparing the latex film based on the demulsification-induced solidification technology as claimed in claim 1, wherein the steps and conditions are as follows:
the conductive electrode sacrificial layer processing method comprises the following steps: and coating or dipping a 10% cellulose acetate acetone solution on the surface of the positive electrode, and drying for 30 minutes to form a uniform film on the surface of the electrode. And then placing the electrodes in a volume ratio of 1: 1 mixture of water and absolute ethyl alcohol, and heating at 80 ℃ for 40 minutes.
6. The method for preparing a latex film based on demulsification induction curing as claimed in claim 1, wherein the steps and conditions are as follows:
applied voltage: voltage size: 0-15V. Electrode distance: 0.5-15 cm. Time of voltage application: 10s-24 h.
7. The method for preparing a latex film based on demulsification induction curing as claimed in claim 1, wherein the steps and conditions are as follows:
under the condition of no power supply, namely when the applied voltage is zero, two electrodes made of conductive materials with different potentials are connected and placed in a container filled with emulsion to form a primary battery, and a membrane material with a compact structure is obtained through the demulsification effect of ions. The thickness of the deposit needs to be controlled by increasing the soaking time.
8. The method for preparing a latex film based on demulsification induction curing as claimed in claim 1, wherein the steps and conditions are as follows:
at room temperature, two conductive material electrodes are placed in a container containing natural rubber emulsion, the two conductive material electrodes are spaced by 2cm, a power supply is switched on, the voltage of the power supply is adjusted to be 0.2-0.5V, the switching-on time is 20-40s, then the power is cut off, the electrodes are taken out and rinsed, and after drying, an emulsion film with the thickness of 1-5 mu m is obtained on the surface of the anode metal.
9. The method for preparing a latex film based on demulsification induction curing as claimed in claim 1, wherein the steps and conditions are as follows:
two electrodes of conductive material are immersed in a container containing the emulsion. Ions are generated by applying a voltage to the electrodes.
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| CN115703945A (en) * | 2021-08-16 | 2023-02-17 | 长春理工大学 | A method for preparing adhesive coating based on demulsification-induced rapid curing technology |
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