Search

CN-121610199-B - Repair adhesive plaster special for salt pond covering film, preparation method and application thereof

CN121610199BCN 121610199 BCN121610199 BCN 121610199BCN-121610199-B

Abstract

The invention provides a special repair adhesive for a salt pond cover film, a preparation method and application thereof, and belongs to the field of salt pond cover film repair. The preparation method of the repair adhesive special for the salt pond cover film comprises the steps of preparing a substrate reinforcing phase, preparing a PVC substrate and carrying out composite molding. The special repair adhesive for the salt pond cover film can meet the long-term use requirement in the severe environment of the salt pond, has good matching performance with the PVC cover film of the salt pond, has good bonding effect and bonding durability on the PVC cover film, and meanwhile, the adhesive has good bonding performance between a base material and the adhesive, is difficult to lose effectiveness in interface bonding, has good durability, and can keep good bonding repair performance in the severe environment of the salt pond for a long time.

Inventors

  • Fang Hengbin
  • SU JUE
  • ZHU JUNTAI
  • CHEN HENG
  • YANG JIE
  • WANG GUOZHENG
  • YU LIJIE

Assignees

  • 山东汇锋新材料有限公司

Dates

Publication Date
20260505
Application Date
20260203

Claims (10)

  1. 1. The preparation method of the repair adhesive special for the salt pond covering film is characterized by comprising the following steps of preparing a substrate reinforcing phase, preparing a PVC substrate and carrying out composite molding; The preparation of the substrate reinforcing phase comprises the following steps of primary reaction and secondary reaction; the primary reaction method comprises the steps of dripping isophorone diamine solution into N, N-dimethylformamide solution containing itaconic anhydride in a solvent environment at 48-50 ℃ under the protection of inert gas, and then carrying out heat preservation reaction to obtain reaction liquid; The secondary reaction method comprises the steps of adding a primary reactant into a solvent, heating to 60-65 ℃, keeping the temperature, dispersing uniformly, regulating the pH value to 6.0+/-0.1, continuously adding composite metal hydroxide slurry, keeping the temperature, reacting to obtain a reaction solution, precipitating the reaction solution by ethanol solution, and collecting a precipitate; The composite metal hydroxide slurry contains zinc hydroxide and zirconium hydroxide; the method for preparing the PVC substrate comprises the steps of mixing polyvinyl chloride resin, a substrate reinforcing phase and an auxiliary agent, and then carrying out banburying and calendaring to form a film to prepare the PVC substrate with the thickness of 0.1-0.3 mm; the method for composite molding comprises the steps of coating acrylic ester adhesive on a release surface of a release film to obtain a release film layer compounded with an adhesive layer, compounding the release film layer compounded with the adhesive layer with a smooth surface of a PVC substrate to obtain a special repair adhesive for a salt pond cover film; The acrylic adhesive is prepared by adding acrylic pressure-sensitive adhesive, isocyanate curing agent, silane coupling agent KH-550 and leveling agent BYK-354 into ethyl acetate, regulating the solid content to 30-35wt%, and uniformly mixing.
  2. 2. The method for preparing the repair adhesive special for the salt pond cover film according to claim 1, wherein in the one-time reaction, the dripping time of isophorone diamine solution is controlled to be 50-70min; the reaction time is kept at 5-6h.
  3. 3. The method for preparing the repair adhesive special for the salt pond cover film according to claim 1, wherein the molar ratio of itaconic anhydride to isophorone diamine adopted in the one-time reaction is 2-2.05:1; the isophorone diamine solution is N, N-dimethylformamide solution of isophorone diamine, and the concentration of isophorone diamine is 30-32wt%.
  4. 4. The method for preparing a repair adhesive for a salt pond cover film according to claim 1, wherein in the secondary reaction, the heat preservation reaction time after adding composite metal hydroxide slurry is 5-6h; the pH of the materials is controlled within the range of 5.8-6.2 in the heat preservation reaction process.
  5. 5. The method for preparing a repair adhesive for a salt pond cover film according to claim 1, wherein in the secondary reaction, the composite metal hydroxide slurry is an N, N-dimethylformamide dispersion liquid containing zinc hydroxide and zirconium hydroxide, the concentration of the zinc hydroxide is 9-9.5wt%, and the concentration of the zirconium hydroxide is 1.9-2.3wt%; the weight ratio of the primary reactant to the composite metal hydroxide slurry is 1:1.7-1.9.
  6. 6. The method for preparing the repair adhesive special for the salt pond cover film, which is disclosed in claim 1, is characterized in that in the preparation of the PVC base material, the auxiliary agents comprise a plasticizer DOP, chlorinated paraffin CP-52, an antioxidant 1010, a light stabilizer 944, an ultraviolet absorbent UV-531, stearic acid, a silane coupling agent KH-550, light calcium carbonate and rutile type titanium dioxide; The weight ratio of polyvinyl chloride resin, base material reinforcing phase, plasticizer DOP, chlorinated paraffin CP-52, antioxidant 1010, light stabilizer 944, ultraviolet absorber UV-531, stearic acid, silane coupling agent KH-550, light calcium carbonate and rutile type titanium dioxide is 100-105:4.5-5.5:28-32:5-6:0.3-0.4:0.3-0.4:0.8-0.9:0.4-0.5:0.8-1:11-13:4-5.
  7. 7. The method for preparing the repair adhesive special for the salt pond cover film according to claim 1, wherein in the composite forming, after the acrylate adhesive is coated on the release surface of the release film, the release film layer compounded with the adhesive layer is obtained after the thickness of the adhesive layer is dried and adjusted to 25-35 mu m.
  8. 8. The method for preparing the repair adhesive special for the salt pond cover film, which is characterized in that the weight ratio of the acrylic pressure-sensitive adhesive to the isocyanate curing agent to the silane coupling agent KH-550 to the leveling agent BYK-354 in the acrylic adhesive is 100-105:3-4:0.6-0.8:0.5-0.6; the room temperature viscosity of the acrylate pressure-sensitive adhesive is 18000-20000 mPas, and the hydroxyl value is 20-30mgKOH/g.
  9. 9. A patch for repairing a salt pond cover film produced by the production method of any one of claims 1 to 8.
  10. 10. An application of the repair adhesive special for the salt pond cover film in the salt evaporation crystallization pond cover film damage repair by adopting the salt pond cover film of claim 9.

Description

Repair adhesive plaster special for salt pond covering film, preparation method and application thereof Technical Field The invention relates to the field of repair of salt pond cover films, in particular to a repair adhesive tape special for a salt pond cover film, a preparation method and application thereof. Background In the process, a special covering film is paved on the liquid surface of the evaporation crystallization pond, and the main effects of the evaporation crystallization pond are that (1) the temperature of a water body in the evaporation crystallization pond is kept, the temperature fluctuation of the water body is reduced, the crystallization rate is improved, (2) foreign matters such as sand wind, bird feces and the like in the external environment are isolated, the pollution of raw salt is prevented, the salt production quality is improved, and (3) the crystallization environment is stabilized, and the fluctuation of the concentration of the brine caused by weather changes (such as rainfall and strong wind) is reduced. At present, the cover film adopted by the evaporative crystallization pond is mainly made of PVC materials, but in the actual use process, the cover film is influenced by factors such as external environment, high-humidity salt fog, day and night temperature difference and the like, and the PVC cover film is easy to damage to generate cracks. Once the PVC covering film is damaged, the functions of heat preservation, anti-fouling and the like are greatly reduced, if the PVC covering film is not repaired immediately, small damaged cracks can be rapidly enlarged, the whole PVC covering film is invalid, and huge economic loss is caused. For the damage of the covering film of the crystallization pond, the damage is usually repaired by adopting general glue. However, the matching between the glue and the PVC covering film is poor, the bonding effect and the bonding durability of the glue on the PVC covering film are poor in the working environment of outdoor and high-humidity salt fog environments, the glue also has adverse effects on the PVC covering film, and the ageing of peripheral film materials at the damaged position is easy to accelerate. In the prior art, the adhesive tape can be used for repairing the damage of the film material, but for the PVC covering film of the evaporative crystallization pond, the conventional adhesive tape is difficult to meet the long-term use requirement under the severe environment of the salt pond, and is mainly characterized in that the bonding performance of the base material of the adhesive tape and the adhesive is poor, the interface bonding of the base material of the adhesive tape and the adhesive is easy to lose efficacy under the conditions of high temperature, salt fog and temperature change faced by the covering film of the salt pond, and meanwhile, the base material of the adhesive tape and the adhesive tape have adverse effects mutually, so that the durability of the adhesive tape is poor, and the good bonding and repairing performance cannot be kept for a long time in the extreme environment of the evaporative crystallization pond for salt production. Based on the method, the special repair adhesive for the salt pond cover film can meet long-term use requirements in a severe salt pond environment, is good in matching performance with the salt pond PVC cover film, has good bonding effect and bonding durability on the PVC cover film, meanwhile, the adhesive has good bonding performance between a base material and adhesive, is difficult to lose effectiveness in interface bonding, has good durability, can keep good bonding repair performance in the severe salt pond environment for a long time, and has important technical significance and research value. Disclosure of Invention In order to solve the technical problems in the prior art, the special repair adhesive for the salt pond cover film provided by the invention can meet the long-term use requirement in the severe environment of the salt pond, has good matching performance with the salt pond PVC cover film, has good bonding effect and bonding durability on the PVC cover film, and meanwhile, has good bonding performance of a base material and adhesive of the adhesive, is difficult to fail in interface bonding, has good durability, and can keep good bonding repair performance in the severe environment of the salt pond for a long time. The invention also provides a preparation method of the repair adhesive special for the salt pond covering film. The invention also provides application of the special repair adhesive for the salt pond cover film in repairing the salt evaporation crystallization pond cover film. In order to solve the technical problems, the technical scheme adopted by the invention is as follows: A method for preparing a repair adhesive special for a salt pond covering film comprises the following steps of preparing a substrate reinforcing phase, preparing a PVC subs