Aluminized composite film adhesive (top)

Directly dedicated to the development of special adhesives, in order to serve the packaging industry, has completed the special glue has 135 °C high temperature cooking glue, 121 °C cooking glue, anti-media glue, aluminum film composite glue, rapid curing glue, washing powder bag Special adhesives and other adhesives designed specifically for packaging companies. This article describes the latest development of our company's new aluminum film adhesive. 
The aluminized composite film is a combination of aluminized films (VMPET, VMBOPP, VMCPP and VMCPE) and a plastic film to form a packaging material with aluminum luster. Because of its good barrier properties, puncture resistance, high and low temperature resistance, boiling resistance and opaque, impervious, and airtight, it has been widely used in food, health care products, pharmaceuticals and cosmetics and other packaging. In the past, the peeling strength of the aluminized composite film on the market was too low. In 1998, Beijing Gaomeng Chemical Co., Ltd. introduced the YH501S special adhesive for aluminized film, which greatly improved the strength of the aluminized composite film, but there was a plastic/plastic composite strength. Not as good as ordinary glue, high system activity, inconvenient operation, and resistance to water boiling at 100°C. In order to meet the needs of the market, on the basis of YH501S aluminum-plated film adhesive, we redesigned the molecular structure and developed a new multi-purpose, high-strength, water-resistant boiled aluminum composite film adhesive. 
First, test part
1. The main raw materials
Dimethyl terephthalate, industrial grade (Beijing Chemical Plant); isophthalic acid, industrial grade (Yanshan Petrochemical); adipic acid, industrial grade (Liaoning Chemical Plant); diethylene glycol, industrial grade (Jinshan Petrochemical) Ethylene glycol, industrial grade (Jinshan Petrochemical); diisocyanate, industrial grade (Bayer); ethyl acetate, industrial grade (Tianjin); catalyst (homemade); VM10 curing agent (homemade). 1# material is full-print BOPP film (20μ)/aluminum-coated CPP (VMCPP) film, which is provided by Qingdao factory; 2# material is full-print BOPP film (28μ)/aluminum-coated CPP (VMCPP) film, which is provided by Beijing manufacturer; The 3# material is a full-print BOPP film (35μ)/aluminum-coated CPP (VMCPP) film, which is provided by Hebei manufacturers;
2. Equipment and instruments
HIROSHIMA laminating machine (Japan), compound speed 50 ~ 70M/MIN; BLD-200S electronic peeling tester. 
3. Synthesis of Polyester Polyols
Measured dimethyl terephthalate, diethylene glycol and catalyst for transesterification reaction until the methanol to the theoretical amount, then add the measured isophthalic acid, adipic acid, ethylene glycol for esterification reaction After reaching the theoretical amount of water, the polycondensation was performed in a vacuum state. The acid value and hydroxyl value were sampled and analyzed at regular intervals. After passing, the polyester polyol was obtained with a molecular weight of about 2000. 
4. Synthesis of adhesive main agent
The measured amount of polyester polyol, diisocyanate and part of ethyl acetate were added into the reaction vessel, heated to a certain temperature and kept at the temperature for several hours. Samples were analyzed for viscosity, solid content, and hydroxyl value. After passing the test, the temperature was lowered and the auxiliary agent and acetate were added. The ester was stirred evenly to obtain the main adhesive agent. The trade name is YH501SL. 
5. Performance Test
1 Solvent residue test. According to YY0235-1996 drug packaging composite film (General) 5.5 solvent residue test. 
2 peel strength. According to BB2790-81, 180°C peel strength was measured. 
Second, the results and discussion
1. Adhesive design principle
The aluminum-plated composite film is a composite of aluminum-plated film and plastic film. The structure is schematically shown in Figure 1 (slightly). 
 According to the diagram, it can be seen that there are mainly the following factors influencing the peel strength of the aluminum-plated composite film:
1 adhesive body strength and the nature of the adhesive;
2 BOPP or PET film and adhesive interface strength;
3 adhesive and VM interface strength;
4VM and CPP or PET film interface strength. 
With the ordinary two-component polyurethane adhesive bond aluminum composite film, composite film peel strength is very low, the peeling failure occurs mainly in the VM-CPP interface, complete transfer of aluminum film, 180 °C peel strength less than 0.3N. This shows that the adhesive body strength, BOPP or PET film and adhesive interface strength, adhesive and VM interface strength are higher than the VM and CPP interface strength. In fact, the interface strength between VM and CPP or PET film is much larger than 0.3N before composite. Therefore, the nature of the adhesive, that is, the nature of the adhesive, the composition, molecular structure, molecular weight distribution, and monomer residual amount of the adhesive have a great influence on the aluminum plating layer, thereby affecting the peel strength and the residual solvent amount. (To be continued)

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