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CN-122011640-A - Intermediate film for dimming glass and application thereof

CN122011640ACN 122011640 ACN122011640 ACN 122011640ACN-122011640-A

Abstract

The invention provides an intermediate film for light-adjusting glass, which comprises polyvinyl butyral resin, a plasticizer and polyether polyol, wherein the glass transition temperature Tg of the intermediate film is less than or equal to 45 ℃, and the crosslinking degree of the intermediate film after being crosslinked at 90-140 ℃ for 30-240 minutes is 70-90%. The prepared intermediate film has good adhesiveness and mechanical properties. After the intermediate film is applied to the dimming glass, the excellent interface adhesiveness and mechanical stability of the dimming glass can be endowed, the dimming performance attenuation problem caused by the migration and precipitation of the plasticizer can be radically avoided, the service life of the dimming glass is remarkably prolonged, and the working stability of the dimming glass is improved.

Inventors

  • LI YANAN
  • Hong Shanhua
  • ZHANG DAWEI
  • ZHAO SHIYONG
  • XIAO SHUYONG
  • ZHANG YUZHE

Assignees

  • 浙江精一新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260411

Claims (13)

  1. 1. An intermediate film for a light-adjusting glass, which is characterized by comprising a polyvinyl butyral resin, a plasticizer and a polyether polyol; The mass content of the polyvinyl butyral resin is 34.5-64.5wt%, the weight average molecular weight is 100000-200000, the melt mass flow rate is 5.0-10.0 g/10 min, and the molar ratio of the vinyl alcohol unit to the butyral unit is (0.5-2.0): 1; the mass content of the plasticizer is 35-65wt% and is selected from one or a combination of trimellitates or phthalic acid esters; the mass content of the polyether polyol is 0.1-5wt% and at least one of polyethylene glycol, polypropylene glycol and polytetramethylene ether glycol, and the weight average molecular weight range of the polyether polyol is 1000-10000; The glass transition temperature Tg of the intermediate film is less than or equal to 45 ℃, and the crosslinking degree of the intermediate film after being crosslinked at the temperature of 90-140 ℃ for 30-240 minutes is 70-90%.
  2. 2. The interlayer film for a light control glass according to claim 1, wherein the interlayer film contains a UV absorber; the mass content of the UV absorber is 0.1-5wt%; The UV absorber is at least one selected from salicylate, benzophenone, benzotriazole, triazine, trimethoxybenzoate, para-aminobenzoic acid, phenyl cinnamate, camphor derivative, benzamidine and benzoxazine.
  3. 3. The interlayer film for a light control glass according to claim 1, wherein the interlayer film contains an IR absorber; the mass content of the IR absorber is 0.1-5wt%; The IR absorber is at least one selected from indium tin oxide, antimony tin oxide, aluminum doped zinc oxide, cesium tungsten bronze, lanthanum hexaboride, tungsten bronze, cyanine dye, phthalocyanine, naphthalocyanine, squaraine, croconic acid dye, poly (3, 4-ethylenedioxythiophene) polystyrene sulfonate.
  4. 4. The interlayer film for a light control glass according to claim 1, wherein the interlayer film contains an antioxidant; The mass content of the antioxidant is 0.1-5wt%; the antioxidant is at least one selected from hindered phenols, aromatic amines, phosphites and thioesters.
  5. 5. The interlayer film for a light control glass according to claim 1, wherein the interlayer film contains a light stabilizer; the mass content of the light stabilizer is 0.1-5wt%; The light stabilizer is at least one selected from hindered amines.
  6. 6. The interlayer film for a light control glass according to claim 1, wherein the interlayer film contains a heat stabilizer; the mass content of the heat stabilizer is 0.1-5wt%; the heat stabilizer is at least one selected from dibutyl tin laurate, iso Xin Yaxi and phosphite esters.
  7. 7. The interlayer film for a light control glass according to claim 1, wherein the interlayer film contains a silane coupling agent; The mass content of the silane coupling agent is 0.1-5wt%; the silane coupling agent is at least one selected from epoxy silane coupling agents, acryloxy silane coupling agents, alkyl silane coupling agents, amino silane coupling agents, vinyl silane coupling agents and thio silane coupling agents.
  8. 8. The interlayer film for a light control glass according to claim 1, wherein at least one surface of the interlayer film is provided with a roll-formed pattern.
  9. 9. A dimming glass comprising, in order: A first transparent substrate; A second transparent substrate; a light modulation film disposed between the first transparent substrate and the second transparent substrate; A first adhesive clamping layer is arranged between the first transparent substrate and the dimming film, and/or a second adhesive clamping layer is arranged between the second transparent substrate and the dimming film; Wherein the first adhesive-sandwiched layer and/or the second adhesive-sandwiched layer is the intermediate film for light-adjusting glass according to any one of claims 1 to 8.
  10. 10. The dimming glass as claimed in claim 9, wherein the dimming film is selected from any one of a suspended particle dimming film, a polymer dispersed liquid crystal dimming film, a dye liquid crystal dimming film, or an electrochromic dimming film.
  11. 11. The light control glass according to claim 9, wherein the first transparent substrate and/or the second transparent substrate is selected from at least one of inorganic glass and organic glass.
  12. 12. A preparation method of dimming glass comprises the following steps: The light-adjusting glass is obtained by superposing the layers and then carrying out glue-clamping treatment according to the structure of the light-adjusting glass of claim 9.
  13. 13. A light-adjusting glass product prepared by the light-adjusting glass according to any one of claims 9 to 11 or the preparation method according to claim 12.

Description

Intermediate film for dimming glass and application thereof Technical Field The invention relates to the field of electronic light control materials, in particular to an intermediate film for light-adjusting glass, light-adjusting glass comprising the intermediate film and a preparation method of the light-adjusting glass. Background The dimming glass is a light control device, and a dimming film is mainly arranged between two layers of transparent glass, wherein the dimming film comprises a Suspended Particle (SPD) dimming film, a Polymer Dispersed Liquid Crystal (PDLC) dimming film, an Electrochromic (EC) dimming film, a Dye Liquid Crystal (DLC) dimming film, a Thermochromic (TC) dimming film, a Photochromic (PC) dimming film and the like. The dimming glass manufactured by using the suspended particle dimming film, the polymer dispersed liquid crystal dimming film and the electrochromic dimming film is respectively called suspended particle dimming glass, polymer dispersed liquid crystal dimming glass and electrochromic dimming glass. For suspended particle dimming glass, polymer dispersed liquid crystal dimming glass, electrochromic dimming glass, when the dimming film is powered on, the arrangement or state of materials in the dimming film is changed, so that the light transmission characteristic of the dimming glass is changed, such as the light transmission characteristic is changed from low light transmission to high light transmission or from high light transmission to low light transmission. The dimming glass capable of realizing rapid switching between on-off states through the action of an electric field/current has the advantages of actively regulating and controlling light transmittance and saving energy, and the device can be used as intelligent windows, rearview mirrors, sunglasses, displays and the like in the fields of spacecrafts, high-speed rails, automobiles, buildings and the like. When the suspended particle dimming glass, the polymer dispersed liquid crystal dimming glass and the electrochromic dimming glass are prepared conventionally, a conventional PVB intermediate film (Polyvinyl butyral interlayer, polyvinyl butyral intermediate film) for laminated glass is generally adopted. The PVB resin is a hard polymer, and can be endowed with high elasticity, toughness and adhesive property by adding a large amount of plasticizers, so that the application requirements of scenes such as automobile windshields, building laminated glass and the like are met. The plasticizer added in the conventional PVB intermediate film is mainly aliphatic esters, and is specifically selected from triethylene glycol diisooctyl ester, triethylene glycol dihexanoate, dibutyl sebacate, triethylene glycol dipelargonate, triethylene glycol diisooctoate, dioctyl dioctoate and the like, however, when the PVB intermediate film containing the aliphatic esters plasticizer is used for preparing the dimming glass, the key technical defects are that the aliphatic esters plasticizer is easy to migrate and separate out in the long-term service process of the dimming glass and permeate into the functional layer of the dimming film, so that the optical regulation performance of the dimming film is invalid, and the use reliability of the dimming glass is seriously affected. Therefore, development of a technical solution that can replace such aliphatic ester plasticizers has become an urgent need to solve the above-mentioned problems. Therefore, developing an intermediate film material with excellent suitability solves the core technical problem of dimming function failure caused by plasticizer migration and precipitation when preparing suspended particle dimming glass, polymer dispersed liquid crystal dimming glass and electrochromic dimming glass by adopting a conventional PVB intermediate film in the prior art, and becomes one of key problems to be overcome by first-line research personnel in the industry. Disclosure of Invention In view of the above, the invention aims to solve the technical problems of dimming function failure and performance attenuation caused by plasticizer migration and precipitation when the conventional PVB intermediate film containing the aliphatic ester plasticizer is used for preparing the dimming glass in the prior art. To this end, the present invention provides an intermediate film capable of fundamentally inhibiting the migration of a plasticizer. The intermediate film adopts a specific polymer matrix and a plasticizer system which is more friendly to the dimming film, and polyether polyol is introduced as a functional component, so that a structure with specific glass transition temperature and crosslinking degree is formed after crosslinking, the excellent interface adhesion and mechanical stability of the dimming glass are endowed, the plasticizer can be effectively anchored through multiple intermolecular forces, the migration of the plasticizer is fundamentally avoided, the service life of