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| In stock: | Yes | Authentication: | 3c |
| Pattern: | Solid | Type: | 1 ° (primary alcohol) |
| Hydroxy number: | Diols | Category: | Aromatic alcohol |
| Model: | C3008 | Specifications: | Premium |
| Trademark: | Reputation | Packaging: | 20kg/barrel |
| Molecular weight: | 3500 | Cohesive Strength: | 35 MPa |
| Viscosity: | 4000 130 degrees | Yield: | 10000000 |
"Polyester polyols to replace Evonik's dynacoll7320" in detail
Polyester polyol to improve the initial tack of PUR hot melt adhesivePUR (Polyurethane Reactive), Chinese full name is moisture curing reactive polyurethane hot melt adhesive. The main component is an isocyanate-terminated polyurethane prepolymer. The adhesion and toughness (elasticity) of PUR can be adjusted, and it has excellent adhesion strength, temperature resistance, chemical resistance and aging resistance. It has become one of the important varieties in the adhesive industry. Now it is widely used in packaging, wood processing, automobile, textile, electromechanical, aviation and other national economic fields.
At present, the main domestic manufacturers of PUR hot melt adhesives include Fuller in the United States, Henkel in Germany, Wanli in Wuxi, Hengtai in Jiaxing, etc. The products of foreign manufacturers have good initial adhesion and stable product quality. However, the products produced by domestic enterprises often have unstable quality, the initial adhesion cannot reach the level of the products of foreign companies, and the glue itself has particles and other reasons. .
How to increase the initial adhesion of the product so that it can be positioned quickly during the bonding process and improve production efficiency is one of the technical problems of domestic enterprises. The methods of increasing the initial tack of the product are currently mostly using tackifying resins, high molecular weight resins, and acrylic resins. Compatibility of these resins with polyester polyols is often not satisfactory, so these tackifying resins can be difficult to disperse and form particles. The generation of particles degrades the quality of the PUR glue. The development of a polyester polyol with good compatibility and high initial viscosity can solve such problems.
C3008 is a crystalline polyester polyol with linear structure, hydroxyl end cap, molecular weight 3500. The polyester itself has high strength and high bonding strength. And C3008 is not a typical crystalline polyester polyol, and has good toughness compared with typical crystalline polyester, and the elongation at break can reach 500%. The viscosity of C3008 is very large, and the material discharge is very slow during the production process. The viscosity is 4000cps under the condition of 130 degrees, which is very large in crystalline polyester polyols. The laboratory shows that the opening time is 40S and the assembly time is 35S under the condition of NCO:OH of 1:2.2, so it has a long construction time, and the tensile strength can reach an amazing 35N/mm2. This kind of polyester is very suitable for woodworking bags Laminated and applied with PUR adhesive, which has a long open time and high strength once bonded. Experiments show that C3008 polyester polyol has good compatibility with most crystalline, amorphous and liquid polyester polyols, which ensures the wide application of C3008.
Polyester polyols for improving the initial adhesion of polyurethane adhesives
