Water resistant whiting emulsion pressure sensitive adhesive synthesis method
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A hydraulic and emulsifier technology, applied in the direction of adhesive types, ester copolymer adhesives, etc., can solve the problems of energy consumption, cumbersome operation steps, and increase the manufacturing cost of pressure-sensitive emulsifiers.
Active Publication Date: 2015-06-24
SHANGHAI HUAYI NEW MATERIAL
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[0017] The existing synthesis method has the disadvantages of cumbersome operation steps, long synthesis time, and tim
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Embodiment 1
[0068] Add 2 parts of emulsifier DNS-86, 1 part of methacrylic acid, 30 parts of butyl acrylate, 1 part of methyl methacrylate, 10 parts of 2-ethylhexyl acrylate, and 2 parts of hydroxyethyl acrylate into the mixing tank Stir evenly in medium to prepare a mixed solution of emulsifier and monomer, set aside.
[0069] Add 50 parts of deionized water into the reaction kettle, raise the temperature, and control the temperature at 78-82°C. Add 0.1 part of potassium persulfate, stir for 5 minutes, and directly add the mixed solution containing emulsifier prepared above dropwise for 2 to 5 hours. After adding the mixed solution for 30 minutes, add 0.1 part of potassium persulfate dropwise to trigger The solution was added dropwise for 3 hours, the reaction temperature was controlled at 80-85°C, and the temperature was kept for 0.5 hours.
[0070] After the heat preservation is over, lower the temperature to 60°C and add tert-butyl hydroperoxide and sodium methyl sulfoxylate aqueous ...
Embodiment 2
[0072] Add 2 parts of emulsifier KD SN-10, 1 part of acrylic acid, 20 parts of 2-ethylhexyl acrylate, 1 part of styrene, 20 parts of butyl acrylate, and 2 parts of hydroxyethyl acrylate into the pre-emulsification tank and stir for a while Evenly to prepare the mixed solution of emulsifier and monomer, set aside.
[0073] Add 50 parts of deionized water into the reaction kettle, raise the temperature, and control the temperature at 78-82°C. Add 0.1 part of potassium persulfate, stir for 5 minutes, drop the above mixed solution containing emulsifier directly, dropwise for 2 to 5 hours, after dropping the monomer mixed solution for 30 minutes, add 0.1 part of potassium persulfate initiator dropwise Solution, the time of dropping is 3 hours, the reaction temperature is controlled at 80-85°C, and the temperature is kept for 0.5 hours.
[0074] After the heat preservation is over, lower the temperature to 60°C and add tert-butyl hydroperoxide and sodium methyl sulfoxylate aqueous ...
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Abstract
The invention discloses a water resistant whiting emulsion pressure sensitive adhesive synthesis method, and a water resistant whiting emulsion pressure sensitive adhesive comprises the following components by weight: 20-60% of a soft monomer; 1-40% of a hard monomer; 1-5% of an emulsifier and the balance of water. The emulsifier is selected from allyloxy nonylphenol propanol polyoxyethylene ether ammonium sulfate, allyloxy nonylphenoxy propanol polyoxyethylene ether ammonium sulfate, allyloxy nonylphenoxy propanol polyoxyethylene ether, and a mixture of allyloxy nonylphenol propanol polyoxyethylene ether ammonium sulfate, allyloxy nonylphenoxy propanol polyoxyethylene ether ammonium sulfate and allyloxy nonylphenoxy propanol polyoxyethylene ether. The method comprises the following steps: (I) mixing the emulsifier and the monomer basically without stirring; (II) adding part of an initiator at 78 to 82 DEG C into a reaction kettle with water, adding dropwise the monomer mixture, after addition of the monomer mixture for 30 minutes, adding dropwise the remaining initiator solution for 2 to 5 hours, controlling the reaction temperature at 80-85 DEG C, and performing thermal insulation for 0.5 to 1 hour; and (III) after thermal insulation, reducing the temperature to 50 to 70 DEG C, adding tert-butyl hydroperoxide and methylsodium hydrosulfite aqueous solution, continuing to react for 0.2-1 hour, and adjusting the emulsion pH value to 6-8 when the temperature is reduced to 40 to 50 DEG C.
Description
technical field [0001] The invention relates to a method for preparing an emulsion pressure-sensitive adhesive. The emulsion pressure-sensitive adhesive prepared by the method does not need a monomer pre-emulsification step, thereby advantageously reducing the cost. technical background [0002] Water blush-resistant latex pressure sensitive adhesives are a conventional pressure sensitive adhesive in the art. For example, US 5,286,843 and 5,536,811 disclose a method of improving the water blush resistance of pressure sensitive adhesives comprising aqueous latex emulsions and water soluble ions by removing the water soluble ions and adjusting the pH to at least 6. The above patents disclose that water soluble ions can be removed by a variety of techniques including centrifugal filtration, dialysis, precipitation, and deionization with ion exchange resins. A preferred method of removing water soluble ions is by contacting the aqueous latex emulsion, the pressure sensitive adh...
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