Protective colloid with effective protection of attachment and method for using the same

A protective colloid formed from raw materials comprising:

• UV epoxy-modified acrylate polymer, heat-expandable particles, plasticizer, active monomer and cationic photoinitiator;
• wherein a weight percent of the UV epoxy-modified acrylate polymer is 40-65%;
• a weight percentage of the heat-expandable particles is 2-10%;
• a weight percentage of the plasticizer is 10-15%;
• a weight percentage of the active monomer is 10-30%;
• and a weight percent of the cationic photoinitiator is 1-3%;
• and
• wherein the plasticizer and the active monomer are water-soluble, and the plasticizer comprises one of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, polyethylene glycol 1000 or a combination thereof;
• the active monomer comprises polyethylene glycol acrylate.

A method for using a protective colloid, comprising:

• a curing step and a separation step:
• wherein the curing step comprises:
• S1, applying a protective colloid on an attachment by dispensing, spraying or brushing;
• raw materials constituting the protective colloid comprising:
• UV epoxy-modified acrylate polymer, heat-expandable particles, plasticizer, active monomer and cationic photoinitiator;
• wherein a weight percent of the UV epoxy-modified acrylate polymer is 40-65%;
• a weight percentage of the heat-expandable particles is 2-10%;
• a weight percentage of the plasticizer is 10-15%;
• a weight percentage of the active monomer is 10-30%;
• and a weight percent of the cationic photoinitiator is 1-3%;
• the protective colloid being in a liquid state;
• and
• S2, curing the protective colloid in the liquid state through a UV curing process, so that the protective colloid is cured and forms an adhesive force with the attachment;
• a wavelength of ultraviolet light in the UV curing process is 365 nm, 395 nm or 405 nm;
• wherein the separation step comprises:
• S3, controlling a temperature of the protective colloid to be higher than 110° C., the heat-expandable particles in the protective colloid expanding and generating internal pressure, so that part or all of the protective colloid expands and separates from the attachment;
• and
• S4, putting the attachment and a remaining part of the protective colloid attached to the attachment into water at 60-95° C. for a preset period of time so as to dissolve the remaining part of the protective colloid on the attachment;
• the preset period of time being 2-20 minutes.