Near infrared blocking membrane and preparation method thereof

[0035] (1) Adhesive synthesis: after feeding N 2 In the case of 200 parts of n-butyl acrylate, 100 parts of ethoxyethyl acrylate, 200 parts of cyclohexyl acrylate, 1 part (0.2% of the total amount of monomers) of dibenzoyl peroxide and 300 parts of ethyl acetate The esters were mixed and added to the reaction flask all at once. Stirring was started and the temperature was raised to 75°C by heating in a water bath, and the reaction was refluxed for 2 hours. The initiator solution consisting of 0.5 parts (0.1% of the total amount of monomers) of dibenzoyl peroxide and 150 parts of ethyl acetate was added dropwise at a constant speed under continuous reflux, and the reflux reaction was continued for 4 hours. Then, the initiator solution consisting of 0.1% dibenzoyl peroxide and 150 parts of ethyl acetate was added dropwise at a constant speed under continuous reflux, and the temperature was raised to 80°C, and the reflux reaction was continued for 4 hours. The reaction liquid was

[0043] When the adhesive was synthesized, the content of alkoxy acrylate accounted for 9% of the total monomers, the ratio of alkyl acrylate to cycloalkyl acrylate was 2:1, and the rest of the synthesis steps were the same as in Example 1.

[0044]1 part of hexafluoroantimonic acid-N,N,N′,N′-tetrakis[p-bis(cyclohexylmethyl)aminophenyl]-p-phenylene diimmonium is selected as the dye, and butyl acetate and xylene are selected as the solvent According to 2:1 compounding, the concentration of the dye solution is 1%, the curing agent is 0.1 part of 1,6-hexamethylene diisocyanate, the thickness of the adhesive film is 30 μm, and the curing conditions are selected as temperature 43 °C, humidity 51% RH, and curing for 87 h. The preparation method is the same as in Example 1.

[0045] The transmittance of the blocking film is 75% in the visible light band (380-780 nm), 8.8% in the near-infrared band at 850 nm, and 8.1% at 950 nm, and the change rate of the transmission spectrum after 5 mon

[0047] When the adhesive is synthesized, the alkoxy acrylate accounts for 25% of the total monomer content, and the ratio of alkyl acrylate to cycloalkyl acrylate is 1:1. The rest of the synthesis steps are the same as in Example 1.

[0048] 3 parts of hexafluoroantimonic acid-N,N,N′,N′-tetrakis[p-bis(cyclohexylmethyl)aminophenyl]-p-phenylene diimmonium are selected as the dye, methyl ethyl ketone is selected as the solvent, and the concentration of the dye solution is 3 %, 4 parts of N,N,N′,N′-tetraglycidyl m-ethylenediamine were selected as the curing agent, the thickness of the viscous adhesive film was 15 μm, and the curing conditions were selected as temperature 47°C, humidity 42%RH, curing 168 h, the preparation method is the same as in Example 1.

[0049] The transmittance of the blocking film is 68% in the visible light band (380~780 nm), 3.3% in the near-infrared band at 850 nm, and 2.1% at 950 nm, and the change rate of the transmission spectrum after one year is 0.5%.