Auxiliary diaphragm for zinc-silver battery and preparation method thereof
阅读说明：本技术 一种锌银电池用辅助隔膜及其制备方法 (Auxiliary diaphragm for zinc-silver battery and preparation method thereof ) 是由 李红祝 刘江涛 李荣年 何世勇 胡晓东 于 2021-06-21 设计创作，主要内容包括：本发明公开了一种锌银电池用辅助隔膜及其制备方法,属于特种纸及其制造技术领域。本发明的锌银电池用辅助隔膜,是以植物纤维、增强纤维为原料,经分散剂分散,采用湿法造纸工艺抄造成型,期间采用液体状增强剂进行表面施胶制作而成；成品纸定量为16～20g/m～(2),厚度为0.035～0.045mm,纵向抗张强度≥1.40kN/m,横向抗张强度≥0.40kN/m,纵向湿抗张强度≥0.35kN/m,纵向伸长率≥2.5%,纵向浸碱收缩率≤11%,横向浸碱收缩率≤12%。通过本发明制备得到的锌银电池用辅助隔膜具有定量低、厚度薄、干湿强度高、耐碱性好等特点,可满足锌银电池的使用要求。(The invention discloses an auxiliary diaphragm for a zinc-silver battery and a preparation method thereof, and belongs to the technical field of special paper and manufacturing thereof. The auxiliary diaphragm for the zinc-silver battery is prepared by taking plant fibers and reinforcing fibers as raw materials, dispersing by using a dispersing agent, manufacturing and forming by adopting a wet papermaking process, and performing surface sizing by adopting a liquid reinforcing agent during the manufacturing process; the basis weight of the finished paper is 16-20 g/m 2 The thickness is 0.035-0.045 mm, the longitudinal tensile strength is more than or equal to 1.40kN/m, the transverse tensile strength is more than or equal to 0.40kN/m, the longitudinal wet tensile strength is more than or equal to 0.35kN/m, the longitudinal elongation is more than or equal to 2.5%, the longitudinal alkali-leaching shrinkage rate is less than or equal to 11%, and the transverse alkali-leaching shrinkage rate is less than or equal to 12%. The auxiliary diaphragm for the zinc-silver battery prepared by the method has the characteristics of low quantification, thin thickness, high dry and wet strength, good alkali resistance and the like, and can meet the use requirements of the zinc-silver battery.)
1. An auxiliary diaphragm for a zinc-silver battery is characterized in that plant fibers and reinforced fibers are used as raw materials, dispersed by a dispersant, manufactured and formed by a wet papermaking process, and a liquid reinforcing agent is used for surface sizing during the manufacturing process; the raw materials comprise, by weight, 85-95 parts of plant fibers and 5-15 parts of reinforcing fibers.
2. The auxiliary separator for a zinc-silver battery according to claim 1, wherein the basis weight of the separator paper is 16 to 20g/m2The thickness is 0.035-0.045 mm, the longitudinal tensile strength is more than or equal to 1.40kN/m, the transverse tensile strength is more than or equal to 0.40kN/m, the longitudinal wet tensile strength is more than or equal to 0.35kN/m, the longitudinal elongation is more than or equal to 2.5%, the longitudinal alkali-leaching shrinkage rate is less than or equal to 11%, and the transverse alkali-leaching shrinkage rate is less than or equal to 12%.
3. The auxiliary separator as claimed in claim 1, wherein the plant fiber is one of manila hemp pulp, flax pulp or paper mulberry fiber pulp.
4. The auxiliary separator for a zinc-silver battery according to claim 1, wherein the reinforcing fibers are polyvinyl alcohol water-soluble fibers or ES fibers.
5. The auxiliary separator for a zinc-silver battery according to claim 1, wherein the dispersant is anionic polyacrylamide or polyethylene oxide.
6. A method for preparing an auxiliary separator for a zinc-silver battery according to claim 1, comprising the steps of:
1) putting 85-95 parts by weight of plant fibers and 5-15 parts by weight of reinforcing fibers into a pulping machine, adding a proper amount of water to enable the mass percentage concentration of the two fibers in the water to be 2-3%, fluffing for 30-40 min by a light cutter, and then taking the cutter to put the pulp into a pulp blending pool;
2) adding a proper amount of dispersant (the dosage is 0.2-0.5 percent of the total weight of the absolutely dry fiber) and water into a pulp mixing tank, and uniformly stirring to obtain the pulp with the mass concentration of 0.1-0.4 percent;
3) conveying the slurry prepared in the step 2) to an inclined-net conical slurry distributor, uniformly spraying the slurry on a forming net by the inclined-net conical slurry distributor, dehydrating, squeezing, applying glue on the surface, drying, coiling, and cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery; wherein the size used in the surface sizing process is a liquid strengthening agent.
7. The method for preparing the auxiliary separator for the zinc-silver battery as claimed in claim 6, wherein the liquid reinforcing agent for surface sizing in step 3) is an aqueous solution of polyvinyl alcohol with a mass concentration of 1.0-4.5%.
Technical Field
The invention belongs to the technical field of special paper and manufacturing thereof, and particularly relates to an auxiliary diaphragm for a zinc-silver battery and a preparation method thereof.
Background
The zinc-silver battery has the advantages of high specific energy, high specific power, stable discharge voltage, capability of discharging with large current, good storage performance and the like, is widely applied to missile, carrier rocket, torpedo, satellite and other weaponry in the military industry, provides power for systems such as power, control, steering engine, remote measurement, safety and the like, and can also be applied to the fields of electronic equipment, medical equipment and the like in the civil aspect.
The battery separator is referred to as the "third electrode" of the battery, and the quality of the separator has a direct influence on the discharge capacity, output voltage, activation time, service life, and the like of the battery.
The auxiliary diaphragm for the zinc-silver battery is a diaphragm material for encapsulating a negative plate of the zinc-silver battery. According to the process requirements of manufacturing a negative plate of the zinc-silver battery, the auxiliary diaphragm has high dry strength and elongation so as to meet the strength requirements of the plate manufacturing on the diaphragm; in order to reduce the internal resistance of the battery, the thickness and the quantification of the auxiliary diaphragm are required to be as low as possible; in addition, the electrolyte of the zinc-silver battery is about 40% of KOH aqueous solution, and the diaphragm is immersed in the KOH aqueous solution in the processes of pole plate formation and battery operation, so that the diaphragm is required to have high wet strength and good alkali resistance. Therefore, the auxiliary separator for a zinc-silver battery is required to have the characteristics of low basis weight, thin thickness, high dry and wet strength, good alkali resistance, and the like. The existing low-basis weight paper can not meet the characteristic requirements.
Disclosure of Invention
In order to overcome the defects, the invention provides a novel preparation method of the auxiliary diaphragm for the zinc-silver battery, and the prepared auxiliary diaphragm has the characteristics of low quantification, thin thickness, high strength, good alkali resistance and the like, and can meet the use requirement of preparing the negative plate of the zinc-silver battery.
The auxiliary diaphragm for the zinc-silver battery is characterized in that plant fibers and reinforcing fibers are used as raw materials, dispersed by a dispersing agent, manufactured and formed by a wet papermaking process, and surface sizing is carried out by using a liquid reinforcing agent during the manufacturing process; the raw materials comprise, by weight, 85-95 parts of plant fibers and 5-15 parts of reinforcing fibers.
The auxiliary diaphragm for the zinc-silver battery is characterized in that the quantitative amount of diaphragm paper is 16-20 g/m2The thickness is 0.035-0.045 mm, the longitudinal tensile strength is more than or equal to 1.40kN/m, the transverse tensile strength is more than or equal to 0.40kN/m, the longitudinal wet tensile strength is more than or equal to 0.35kN/m, the longitudinal elongation is more than or equal to 2.5%, the longitudinal alkali-leaching shrinkage rate is less than or equal to 11%, and the transverse alkali-leaching shrinkage rate is less than or equal to 12%.
The auxiliary diaphragm for the zinc-silver battery is characterized in that the plant fiber is one of manila hemp pulp, flax pulp or paper mulberry bark fiber pulp.
The auxiliary diaphragm for the zinc-silver battery is characterized in that the reinforcing fiber is polyvinyl alcohol water-soluble fiber or ES fiber.
The auxiliary diaphragm for the zinc-silver battery is characterized in that the dispersant is anionic polyacrylamide or polyethylene oxide.
The preparation method of the auxiliary diaphragm for the zinc-silver battery is characterized by comprising the following steps of:
1) putting 85-95 parts by weight of plant fibers and 5-15 parts by weight of reinforcing fibers into a pulping machine, adding a proper amount of water to enable the mass percentage concentration of the two fibers in the water to be 2-3%, fluffing for 30-40 min by a light cutter, and then taking the cutter to put the pulp into a pulp blending pool;
2) adding a proper amount of dispersant (the dosage is 0.2-0.5 percent of the total weight of the absolutely dry fiber) and water into a pulp mixing tank, and uniformly stirring to obtain the pulp with the mass concentration of 0.1-0.4 percent;
3) conveying the slurry prepared in the step 2) to an inclined-net conical slurry distributor, uniformly spraying the slurry on a forming net by the inclined-net conical slurry distributor, dehydrating, squeezing, applying glue on the surface, drying, coiling, and cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery; wherein the size used in the surface sizing process is a liquid strengthening agent.
The preparation method of the auxiliary diaphragm for the zinc-silver battery is characterized in that the liquid reinforcing agent used for surface sizing in the step 3) is a polyvinyl alcohol aqueous solution, and the mass concentration is 1.0-4.5%.
In the invention, the meanings of the common words in all industries are as follows:
polyvinyl alcohol water-soluble fiber: the synthetic fiber is prepared by spinning polyvinyl alcohol as a raw material. 100 parts of polyvinyl alcohol with the polymerization degree of 500-2000 and the alcoholysis degree of 75-99 percent are added into a stainless steel dissolving kettle by 200-400 parts of mixed solvent with the volume ratio of dimethyl sulfoxide to water being not less than 90-70: 10-30, the mixed solvent is dissolved for 3-4 hours at the temperature of 80-120 ℃ and under the pressure of-0.01-0.08 MPa under stirring to prepare spinning solution, and the spinning solution is filtered, defoamed, spun by a dry-wet method and post-treated to obtain the polyvinyl alcohol water-soluble fiber. It has ideal bonding strength, can form effective bonding between fibers under the conditions of heating, pressurizing and humidifying, and is an ideal fibrous reinforcing agent in the papermaking industry.
ES fibers: the ES fiber is a bicomponent fiber with a skin/core structure, the skin layer is Polyethylene (PE), the core layer is polypropylene (PP), and the bonding between the fibers can be realized by heat treatment by utilizing the melting point difference of the two. The ES fibers in the examples of the present invention were obtained from JNC, Japan.
Compared with the prior art, the invention has the following beneficial effects:
1) the invention adopts the plant fiber commercial pulp as the raw material, and simultaneously, the fibrous reinforcing agent is added for reinforcement (compared with the liquid reinforcing agent, the retention rate is higher), and the technical process for preparing the diaphragm paper is more environment-friendly.
2) The invention adopts the inclined net forming technology, can adjust the angle of the front wall corner of the headbox of the paper machine, enables the fibers to be better arranged in a cross way when the fibers are on the net, is beneficial to the adjustment of the longitudinal and transverse strength of the paper and simultaneously improves the uniformity of the paper.
3) The fiber raw materials adopted by the invention mainly comprise long fiber plant fibers, the fiber length is more than 4mm, the beating mode mainly comprises defibering, the fibers are not cut as far as possible, and the long fibers are beneficial to improving the interweaving contact area among the fibers and improving the tear resistance of the paper.
4) The invention improves the strength of paper by adding the reinforcing fiber and the liquid reinforcing agent and combining surface sizing, and realizes that the paper has higher strength under the condition of low basis weight.
5) The auxiliary diaphragm for the zinc-silver battery is prepared by taking plant fibers as a main raw material, adding reinforcing fibers, pulping, dispersing by a dispersing agent, and manufacturing by adopting a wet non-woven process of an inclined net forming technology, wherein slurry is uniformly sprayed on a forming net by a slurry distributor, and the auxiliary diaphragm for the zinc-silver battery is prepared by the steps of dewatering, squeezing, surface sizing, drying, coiling, slitting and the like.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example 1
1) 95kg of manila hemp pulp and 5kg of polyvinyl alcohol water-soluble fibers (the length is 4mm, the linear density is 2.0 dtex) are put into a beater stored with 3900kg of water, the mass concentration of the fibers in the water is 2.5 percent, a light knife is used for defibering for 30min, and then the knife is started to put the pulp into a pulp mixing pool.
2) Adding a certain amount of anionic polyacrylamide dispersant (the dosage is 0.2 percent of the total weight of the absolutely dry fibers) and water into a pulp preparation pool, and uniformly stirring to obtain the pulp with the mass concentration of 0.1 percent.
3) Conveying the prepared slurry to an inclined-net conical slurry distributor, performing net-surfing forming, dewatering, squeezing, surface sizing, drying and coiling, cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery, wherein the liquid reinforcing agent used in the surface sizing process is a polyvinyl alcohol aqueous solution, the mass concentration is 4.5%, and the ration of the obtained finished product is 17.5 g/m2The thickness is 0.038mm, the longitudinal tensile strength is 1.41kN/m, the transverse tensile strength is 0.41kN/m, the longitudinal wet tensile strength is more than or equal to 0.39kN/m, the longitudinal elongation is 2.8%, the longitudinal alkali immersion shrinkage is 9%, and the transverse alkali immersion shrinkage is 10%.
Example 2
1) Taking 90kg of manila hemp pulp and 10kg of polyvinyl alcohol water-soluble fiber (the length is 4mm, the linear density is 2.0 dtex) and putting the manila hemp pulp and the polyvinyl alcohol water-soluble fiber into a beater stored with 3900kg of water, wherein the mass concentration of the fiber in the water is 2.5%, untwining for 30min by a light knife, and then taking out the knife to put the pulp into a pulp mixing pool.
2) Adding a certain amount of anionic polyacrylamide dispersant (the dosage is 0.2 percent of the total weight of the absolutely dry fibers) and water into a pulp preparation pool, and uniformly stirring to obtain the pulp with the mass concentration of 0.2 percent.
3) Conveying the prepared slurry to an inclined-net conical slurry distributor, performing net-surfing forming, dewatering, squeezing, surface sizing, drying and coiling, cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery, wherein the liquid reinforcing agent used in the surface sizing process is a polyvinyl alcohol aqueous solution, the mass concentration is 1%, and the ration of the obtained finished product is 19.0g/m2The thickness is 0.041 and mm, the longitudinal tensile strength is 1.51kN/m, the transverse tensile strength is 0.45kN/m, the longitudinal wet tensile strength is more than or equal to 0.41kN/m, the longitudinal elongation is 3.2%, the longitudinal alkali-leaching shrinkage is 8.5%, and the transverse alkali-leaching shrinkage is 9.5%.
Example 3
1) Putting 95kg of linseed pulp and 5kg of polyvinyl alcohol water-soluble fibers (the length is 4mm, and the linear density is 2.0 dtex) into a beater stored with 3900kg of water, wherein the mass concentration of the fibers in the water is 2.5 percent, putting the fibers into a light knife for defibering for 40min, and then taking up the knife to put the pulp into a pulp mixing pool.
2) Adding a certain amount of polyoxyethylene dispersant (the dosage is 0.4 percent of the total weight of the absolutely dry fibers) and water into a pulp preparation tank, and uniformly stirring to obtain the pulp with the mass concentration of 0.3 percent.
3) Conveying the prepared slurry to an inclined-net conical slurry distributor, performing net-surfing forming, dewatering, squeezing, surface sizing, drying and coiling, cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery, wherein the liquid reinforcing agent used in the surface sizing process is a polyvinyl alcohol aqueous solution, the mass concentration is 2.5%, and the ration of the obtained product is 17.8 g/m2The thickness is 0.038mm, the longitudinal tensile strength is 1.43kN/m, the transverse tensile strength is 0.41kN/m, the longitudinal wet tensile strength is more than or equal to 0.38kN/m, the longitudinal elongation is 3.1%, the longitudinal alkali-leaching shrinkage is 10%, and the transverse alkali-leaching shrinkage is 10.5%.
Example 4
1) 90kg of linseed pulp and 10kg of polyvinyl alcohol water-soluble fibers (the length is 4mm, the linear density is 2.0 dtex) are put into a beater stored with 3900kg of water, the mass concentration of the fibers in the water is 2.5 percent, a light knife is used for defibering for 40min, and then the knife is started to put the pulp into a pulp mixing pool.
2) Adding a certain amount of polyoxyethylene dispersant (the dosage is 0.3 percent of the total weight of the absolutely dry fibers) and water into a pulp preparation tank, and uniformly stirring to obtain the pulp with the mass concentration of 0.4 percent.
3) Conveying the prepared slurry to an inclined-net conical slurry distributor, performing net-surfing forming, dewatering, squeezing, surface sizing, drying and coiling, cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery, wherein the liquid reinforcing agent used in the surface sizing process is a polyvinyl alcohol aqueous solution, the mass concentration is 3.5%, and the ration of the obtained finished product is 19.0g/m2The thickness is 0.045mm, the longitudinal tensile strength is 1.51kN/m, the transverse tensile strength is 0.45kN/m, the longitudinal wet tensile strength is more than or equal to 0.40kN/m, the longitudinal elongation is 3.6%, the longitudinal alkali-leaching shrinkage rate is 8%, and the transverse shrinkage rate is 8.5%.
Example 5
1) 95kg of hemp-seed hemp pulp and 5kg of ES fibers (the length is 4mm, and the linear density is 1.67 dtex) are put into a beater stored with 3900kg of water, the mass concentration of the fibers in the water is 2.5 percent, the fibers are fluffed for 30min by a light knife, and then the knife is lifted to put the pulp into a pulp mixing pool.
2) Adding a certain amount of anionic polyacrylamide dispersant (the dosage is 0.2 percent of the total weight of the absolutely dry fibers) and water into a pulp preparation pool, and uniformly stirring to obtain the pulp with the mass concentration of 0.1 percent.
3) Conveying the prepared slurry to an inclined-net conical slurry distributor, performing net-surfing forming, dewatering, squeezing, surface sizing, drying and coiling, cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery, wherein the liquid reinforcing agent used in the surface sizing process is a polyvinyl alcohol aqueous solution, the mass concentration is 4.5%, and the ration of the obtained finished product is 17.7 g/m2The thickness is 0.040mm, the longitudinal tensile strength is 1.46kN/m, the transverse tensile strength is 0.43kN/m, the longitudinal wet tensile strength is more than or equal to 0.37kN/m, the longitudinal elongation is 3.2%, the longitudinal alkali immersion shrinkage is 10%, and the transverse alkali immersion shrinkage is 11%.
Example 6
1) 85kg of hemp-seed hemp pulp and 15kg of ES fibers (the length is 4mm, and the linear density is 1.67 dtex) are put into a beater stored with 3900kg of water, the mass concentration of the fibers in the water is 2.5 percent, the fibers are fluffed for 30min by a light knife, and then the knife is lifted to put the pulp into a pulp mixing pool.
2) Adding a certain amount of anionic polyacrylamide dispersant (the dosage is 0.2 percent of the total weight of the absolutely dry fibers) and water into a pulp preparation pool, and uniformly stirring to obtain the pulp with the mass concentration of 0.2 percent.
3) Conveying the prepared slurry to an inclined-net conical slurry distributor, performing net-surfing forming, dewatering, squeezing, surface sizing, drying and coiling, cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery, wherein the liquid reinforcing agent used in the surface sizing process is a polyvinyl alcohol aqueous solution with the mass concentration of 1.5%, and the ration of the obtained finished product is 18.5g/m2The thickness is 0.043mm, the longitudinal tensile strength is 1.48kN/m, the transverse tensile strength is 0.43kN/m, the longitudinal wet tensile strength is more than or equal to 0.39kN/m, the longitudinal elongation is 3.2%, the longitudinal alkali-leaching shrinkage is 9.8%, and the transverse alkali-leaching recovery is performedThe shrinkage was 10.5%.
Example 7
1) 95kg of linseed pulp and 5kg of ES fibers (the length is 4mm, the linear density is 1.67 dtex) are put into a beater which is stored with 3900kg of water, the mass concentration of the fibers in the water is 2.5 percent, a light knife is used for defibering for 40min, and then the knife is lifted to put the pulp into a pulp mixing pool.
2) Adding a certain amount of polyoxyethylene dispersant (the dosage is 0.5 percent of the total weight of the absolutely dry fibers) and water into a pulp preparation tank, and uniformly stirring to obtain the pulp with the mass concentration of 0.3 percent.
3) Conveying the prepared slurry to an inclined-net conical slurry distributor, performing net-surfing forming, dewatering, squeezing, surface sizing, drying and coiling, cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery, wherein the liquid reinforcing agent used in the surface sizing process is a polyvinyl alcohol aqueous solution with the mass concentration of 2.5 percent, and the ration of the obtained finished product is 18.8g/m2The thickness is 0.042mm, the longitudinal tensile strength is 1.43kN/m, the transverse tensile strength is 0.40kN/m, the longitudinal wet tensile strength is more than or equal to 0.38kN/m, the longitudinal elongation is 3.4%, the longitudinal alkali-leaching shrinkage is 10%, and the transverse alkali-leaching shrinkage is 10.6%.
Example 8
1) 90kg of flax pulp and 10kg of ES fibers (the length is 4mm, the linear density is 1.67 dtex) are put into a beater which is stored with 3900kg of water, the mass concentration of the fibers in the water is 2.5 percent, a light knife is used for defibering for 40min, and then the knife is lifted to put the pulp into a pulp mixing pool.
2) Adding a certain amount of polyoxyethylene dispersant (the dosage is 0.3 percent of the total weight of the absolutely dry fibers) and water into a pulp preparation tank, and uniformly stirring to obtain the pulp with the mass concentration of 0.4 percent.
3) Conveying the prepared slurry to an inclined-net conical slurry distributor, performing net-surfing forming, dewatering, squeezing, surface sizing, drying and coiling, cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery, wherein the liquid reinforcing agent used in the surface sizing process is a polyvinyl alcohol aqueous solution, the mass concentration is 3.5%, and the ration of the obtained finished product is 19.6g/m2A thickness of 0.046mm, a longitudinal tensile strength of 1.65kN/m, a transverse tensile strength of 0.44kN/m, a longitudinal wet tensile strengthThe degree is more than or equal to 0.42kN/m, the longitudinal elongation is 3.5 percent, the longitudinal alkali leaching shrinkage is 8.6 percent, and the transverse alkali leaching shrinkage is 9.2 percent.
Example 9
1) 95kg of paper-structure fiber pulp and 5kg of polyvinyl alcohol water-soluble fibers (the length is 4mm, the linear density is 2.0 dtex) are put into a beater stored with 3900kg of water, the mass concentration of the fibers in the water is 2.5 percent, a light knife is used for defibering for 40min, and then the knife is started to put the pulp into a pulp mixing pool.
2) Adding a certain amount of polyoxyethylene dispersant (the dosage is 0.3 percent of the total weight of the absolutely dry fibers) and water into a pulp preparation tank, and uniformly stirring to obtain the pulp with the mass concentration of 0.4 percent.
3) Conveying the prepared slurry to an inclined-net conical slurry distributor, performing net-surfing forming, dewatering, squeezing, surface sizing, drying and coiling, cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery, wherein the liquid reinforcing agent used in the surface sizing process is a polyvinyl alcohol aqueous solution, the mass concentration is 4.5%, and the ration of the obtained finished product is 18.1g/m2The thickness is 0.041mm, the longitudinal tensile strength is 1.49kN/m, the transverse tensile strength is 0.43kN/m, the longitudinal wet tensile strength is more than or equal to 0.39kN/m, the longitudinal elongation is 3.5%, the longitudinal alkali-dipping shrinkage rate is 9%, and the transverse shrinkage rate is 9.5%.
Example 10
1) 90kg of paper-structure fiber pulp and 10kg of ES fibers (the length is 4mm, and the linear density is 1.67 dtex) are put into a beater stored with 3900kg of water, the mass concentration of the fibers in the water is 2.5 percent, a light knife is used for defibering for 30min, and then the knife is started to put the pulp into a pulp mixing pool.
2) Adding a certain amount of polyacrylamide dispersant (the dosage is 0.2 percent of the total weight of the absolutely dry fibers) and water into a pulp preparation pool, and uniformly stirring to obtain the pulp with the mass concentration of 0.3 percent.
3) Conveying the prepared slurry to an inclined-net conical slurry distributor, performing net-surfing forming, dewatering, squeezing, surface sizing, drying and coiling, cutting into discs to obtain the auxiliary diaphragm for the zinc-silver battery, wherein the liquid reinforcing agent used in the surface sizing process is a polyvinyl alcohol aqueous solution, the mass concentration is 4.0%, and the ration of the obtained finished product is 19.1g/m2The thickness is 0.045mm, the longitudinal tensile strength is 1.50kN/m, the transverse tensile strength is 0.41kN/m, the longitudinal wet tensile strength is more than or equal to 0.45kN/m, the longitudinal elongation is 3.2%, the longitudinal alkali immersion shrinkage is 8.5%, and the transverse shrinkage is 9%.
The invention adopts 100 percent plant fiber (any one of manila hemp pulp, flax pulp or paper-making fiber pulp) as raw material, which is dispersed by dispersant, and is made into paper by wet paper-making process, and during the process, polyvinyl alcohol aqueous solution (mass concentration is 4.0 percent) is adopted for surface sizing to manufacture the diaphragm. Test results show that the longitudinal strength, the transverse strength and the wet strength of the diaphragm can not meet the technical index requirements. The reinforcing technical measure of combining the addition of the reinforcing fiber and the surface sizing of the polyvinyl alcohol is adopted, and a good technical effect is achieved.
The statements in this specification merely set forth a list of implementations of the inventive concept and the scope of the present invention should not be construed as limited to the particular forms set forth in the examples.