Adhesive composition and reflective film produced therefrom
A composition and adhesive technology, applied in the field of reflective signs, can solve problems such as low production efficiency and low processing efficiency
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[0062] In the present invention, unless otherwise indicated, the reagents used were all commercially available products, which were directly used without further purification treatment. In addition, "%" mentioned is "% by weight".
[0063] testing method
[0064] In the present disclosure, the properties of the reflective films obtained in the following preparation examples, examples and comparative examples were tested. The specific test method is described as follows.
[0065] Peel force
[0066] In the present invention, the adhesiveness between the lettering film (heat-sensitive acrylic adhesive layer) and the base film (reflective layer) was examined by peeling force. Specifically, according to the method specified in the national standard GB / T 7122-1996, measure the 180° angle peeling force between the letter film and the bottom film after the reflective film is kept at 25°C and 50°C for 24 hours, and measure the The peeling force between the word film and the ba...
preparation example 1
[0071] Preparation example 1 (synthesis of methyl methacrylate-butyl acrylate-acrylic acid terpolymer P1)
[0072] 60 g methyl methacrylate, 36 g butyl acrylate, 4 g acrylic acid, 150 g ethyl acetate and 0.2 g azobisisovaleronitrile (Vazo 67) were added to the flask, mixed well and the flask was purged with nitrogen for 1 minute. The flask was then heated to 65° C. for 24 hours under nitrogen protection to obtain a copolymer solution comprising methyl methacrylate-butyl acrylate-acrylic acid terpolymer P1 with a solid content of about 40% by weight.
[0073]According to the solid content test before and after the reaction, it can be seen that the reactant monomer reacts almost completely (monomer conversion rate is more than 98.5% by weight), therefore, it can be considered that the reactant monomer is almost completely converted into the obtained methyl methacrylate-butyl acrylate Polymerized units in ester-acrylic acid terpolymers. Thus, based on the total weight of the res...
preparation example 2
[0074] Preparation example 2 (synthesis of methyl methacrylate-butyl acrylate-acrylic acid terpolymer P2)
[0075] 66 g methyl methacrylate, 30 g butyl acrylate, 4 g acrylic acid, 150 g ethyl acetate and 0.2 g azobisisovaleronitrile (Vazo 67) were added to the flask, mixed well and the flask was purged with nitrogen for 1 minute. The flask was then heated to 65° C. for 24 hours under nitrogen protection to obtain a copolymer solution comprising methyl methacrylate-butyl acrylate-acrylic acid terpolymer P2 with a solid content of about 40% by weight.
[0076] According to the test, it can be known that the reactant monomer is completely reacted, wherein based on the total weight of the obtained methyl methacrylate-butyl acrylate-acrylic acid terpolymer P2, the methyl methacrylate polymerized unit is about 66% by weight, The polymerized units of butyl acrylate were about 30% by weight, and the polymerized units of acrylic acid were about 4% by weight. The weight average molecul...
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