Abstract : The preparation and properties of new polyurethane adhesives for aluminized composite films are introduced. The adhesive has strong initial adhesion, high peel strength, and low residual solvent, and is suitable for a rapid aluminum-plating composite film production line.
Keywords: food packaging, polyurethane, adhesive, dry compound
Foreword
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 adhesive for YH501S aluminized film [1], which greatly improved the strength of the aluminized composite film, but there was plastic. Plastic composite strength is not as good as that of ordinary plastics, high system activity, inconvenient operation, and resistance to water boiling at 100°C. In order to meet the needs of the market, we redesigned the molecular structure based on the YH501S aluminum-plated film adhesive and developed a new type of adhesive for multi-purpose, high-strength, water-resistant boiled aluminum composite film.
1 Test section
1.1 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, Home Made; VMl0 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 (2811)/aluminum-plated CPP (VMCPP) film, Beijing Factory Provide: 3# material is full-print BOPP film (3511)/aluminum-coated CPP (VMCPP) film, Hebei factory provides;
1.2 Equipment and Instruments
HIROSHIMA laminating machine (Japan), compound speed 50 ~ 70m/min;
BLD-200s electronic peel tester.
1.3 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.
1.4 Synthesis of Binders
The measured amount of polyester polyol, diisocyanate and part of ethyl acetate were added into the reaction kettle, and the temperature was raised 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 and acetate were added. The ester was stirred well to obtain the main adhesive agent. The trade name was YH5lSL.
1.5 Performance Test
1.5.1 Solvent Residue Test
According to YY0236-1996 drug packaging composite film (General) 5.5 solvent residue test.
1.5.2 Peel strength
According to GB2790-81, 180° peel strength was measured.
2 Results and Discussion
2.1 Adhesive Design Principle
Aluminized composite film is a composite aluminum film and plastic film together, the structure shown in Figure 1.
According to the diagram, it can be seen that the peel strength of the aluminum-plated composite film is mainly determined by the following factors:
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.
Because we want to help you to get the best storage solution for your clothes and space, our wardrobes have a variety of styles and sizes. Many come with interior fittings included such as clothes rails or shelves. With our wardrobes, you get to choose your own fittings to suit what you wear. You can even design your own in different sizes and styles to create your own personal wardrobe. For extra space solutions, take a look at our range of corner wardrobes. The framed doors, streamlined drawers and elegant nickel-finish handles make this piece part of the transitional style, so it can be adapted to any room, whatever the décor.It is flat-packed with detailed instructio
Wooden Wardrobe,Wood Wardrobe,Bedroom Wardrobe,White Wardrobe
FuJian YuanFu Import&Export Trading Co., Ltd. , http://www.fjyffurniture.com