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Acrylate adhesives are commonly used in daily life. Acrylate hot melt adhesives have high bond strength and shear strength, and their oxidation resistance and weather resistance are good. In this paper, a large number of experiments and research work have been carried out based on the current development status of acrylate hot melt adhesives and the problems of adhesive removal in the bonding of waxed paper boxes and waste paper recycling.

The main research results include (1) Methyl methacrylate (MMA), laurel methacrylate (LMA), vinyl acetate (VAc), and acrylic acid as copolymers and potassium persulfate as initiation The re-dispersible acrylate hot melt adhesive was prepared by semicontinuous emulsion polymerization.

When the ratio of Op-10 to Span-80 of the paraffin composite emulsifier is 0.55/0.45, the paraffin emulsion can be prepared. When the contents of LMA, n-dodecyl mercaptan (NDM), and N-(methoxymethyl) acrylamide are 9%, 0.8%, and 0.3%, respectively, the reaction conversion rate can reach 95.59%, and the polymer has excellent thermal performance and bond strength.

Adding dioctyl phthalate (DOP) and rosin continues to improve the melt fluidity and adhesion of hot melt adhesive, DOP and rosin content is 7.5% and 6% of the mass of the matrix polymer, respectively, redispersing acrylate hot melt adhesive has excellent thermal stability, low melt viscosity, high bond strength, good redispersing effect, used in paper products bonding and carton sealing, can be reduced It is difficult to deal with adhesive when recycling fewer paper products, so as to realize efficient recycling of paper products.

(2) Using VAc, MMA, acrylic acid, and butyl acrylate as the copolymer and potassium persulfate as the initiator, the low-temperature hot melt adhesive which can be used for the sealing of waxed paper box was prepared by semi-continuous emulsion polymerization. When the paraffin emulsion content is 10%, the composite emulsion is more stable and the polymer melting fluidity is suitable.

When the content of MMA is 5.2%, the reaction conversion rate is higher, the peel strength of the polymer can reach 55N/25mm, and the shear strength is higher. When DOP is added to improve the bonding strength and melting viscosity of the hot melt adhesive, the low-temperature hot melt adhesive prepared by DOP content is 10% of the mass of the matrix polymer has good comprehensive performance and can be used in the sealing bonding of the impregnated wax paper box. Low-temperature hot melt adhesive has excellent bonding strength, avoid the wax paper box nail caused damage to the goods in the box.

(3) The process flow chart of two kinds of hot melt adhesives is drawn, and the material balance and cost accounting are carried out respectively. According to the comparison with the hot melt adhesives sold on the market, the two kinds of low-temperature hot melt adhesives prepared in this experiment are reasonable in price, excellent in comprehensive performance, and competitive in the market.

1. The form of adhesive;
2. Preparation and application of adhesives;
3. Storage period of adhesive;
4. Adhesive application period;
5. The use of adhesive necessary means or equipment;
6. Variability of bonding process;
7. Layer drying time and temperature;
8. Curing temperature and use temperature of adhesive layer;
9. The change rate of bonding strength at different temperatures;
10. Special requirements and preventive measures, such as odor, flammability, toxicity, etc.
    

Impregnating glue: impregnating glue [T90 or T88], Crylate 90C non-paint impregnating glue, impregnating glue liquid [85C], Ultraseal

Super seal British original imported infiltrating glue, ZY-S1 anaerobic infiltrating glue, Xinbao SU-90C vacuum infiltrating glue, infiltrating glue POC

Anaerobic glue: Ritai anaerobic glue < plane sealant 510, 515, 518>, Xinbao 340 anaerobic glue, 609 anaerobic glue, 680

Anaerobic glue, 638 anaerobic glue, anaerobic glue B-242, Loctite 545 anaerobic glue, Loctite 243 anaerobic glue, liquid raw material belt, snail

Grain locking sealant, cylindrical holding sealant, flat sealant, pipe thread sealant, UV anaerobic glue, K-200R silicone

Anaerobic glue, K-201G silicone anaerobic glue, 222 anaerobic glue, Matabang 609 cylindrical solid glue, Deppon 2326 anaerobic

Oxygen glue, Mataibang 638 cylindrical solid glue, etc.

Waterproof glue: circuit board waterproof glue, PVC waterproof glue, raincoat 1000 PU waterproof glue, SOLONE waterproof eyeliner glue, AE-5778 waterproof glue, LED waterproof glue, display waterproof glue, UV hardening resin UV-3030.3091 3491 glue, special waterproof glue for external wall.

Pressure-sensitive adhesive (PSA, referred to as pressure-sensitive adhesive), is a pressure-sensitive adhesive, only the use of finger pressure, can be closely bonded with the adhesive. With the increasingly strict control of VOC emission, more and more solvent-based pressure-sensitive adhesives need to be changed to water-based pressure-sensitive adhesives or hot-melt pressure-sensitive adhesives. In the existing water-based pressure-sensitive adhesives, there are problems such as temperature resistance and insufficient cohesion, and it is very difficult to achieve the performance of high peel strength.

RAFT is short for Reversible Addition Fragmentation Chain Transfer Polymerization. In addition, RAFT is a type of active/controllable free radical polymerization (CRP). Acrylic ester block copolymer prepared by RAFT emulsion polymerization has high breaking strength, high elongation at break, and high low-temperature balance performance. The pressure-sensitive adhesive prepared by acrylic ester block copolymer has excellent advantages such as high cohesion strength and high-temperature resistance, which solves the shortcomings of conventional acrylic ester emulsion pressure-sensitive adhesive which lacks cohesion and is not resistant to high temperatures at 120℃ or above.

Pressure-sensitive adhesive with high peeling strength is needed in the bonding of automobiles, electronics, TV screens, screen printing, etc. For example, the peeling strength of single-side PET pressure-sensitive adhesive tape prepared into 50um adhesive layer thickness needs to reach more than 15N/25mm. In the preparation process of traditional pressure-sensitive adhesive, viscosifying resin can be added to improve the initial viscosity and peeling strength of the product.

In the acrylic block copolymer emulsion pressure-sensitive adhesive by the physical blending of water-based rosin ester tackifier resin, it was found that the initial adhesion and peeling strength of the adhesive can also be improved, but the improvement effect is not obvious, possibly because the compatibility between acrylate front copolymer and tackifier resin is not good.

Therefore, for the preparation of water-based pressure-sensitive adhesive by acrylate front-end copolymer, it is still necessary to continue to try and explore, preparing products with higher peeling strength and longer adhesion.

Modified water-based acrylate PSA has excellent bonding properties, no pollution to the environment, and good water resistance, heat resistance, creep resistance, and stability, its application prospects and application fields are very broad. The purpose of the modification method or polymerization method is to improve the adhesion, coating resistance, water resistance, heat resistance, and economy of PSA, that is, to prepare acrylate PSA with excellent performance and good comprehensive performance. Therefore, the future development trend of water-based acrylate PSA is that multiple modification methods are used at the same time to prepare high-performance water-based acrylate PSA with high solid content and a variety of special functions in one to meet the application needs of different fields.