Low-friction-coefficient and solvent-free type polyurethane adhesive and preparation method thereof
A polyurethane adhesive and low friction coefficient technology, applied in the field of polyurethane adhesive preparation, can solve the problems of high friction coefficient of composite film, composite film cannot be pulled, and can not be opened, so as to achieve good coating performance, wide application range, and reduce crystallinity Effect
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[0036] The embodiment of the present invention also provides a method for preparing the above-mentioned low friction coefficient solvent-free polyurethane adhesive, which includes the following steps:
[0037] Prepare the modified polyester polyol of component A and the modified polyester polyol of component B according to the above-mentioned adhesive formula;
[0038] Preparation of component A: adding polyisocyanate, keeping the kettle temperature at 25-35°C, adding the modified polyester polyol prepared, reacting at 70-80°C for 3 to 4 hours, and reducing to room temperature to obtain component A;
[0039] The prepared component A and component B are used according to the molar ratio of functional groups: -NCO: -OH=(1.1-1.8):1 to form the solvent-free polyurethane adhesive.
[0040] Two surfaces in contact with each other, when at rest, the contact between the two surfaces will form a strong bonding force, which is the static friction force. Unless the bonding force is destroyed, one...
Example Embodiment
[0043] Example one
[0044] This embodiment provides a solvent-free two-component polyurethane adhesive, which is composed of components A and B, wherein component A is formed by the reaction of modified polyester polyol and polyisocyanate, which is a modified Isocyanate adduct; component B is polyester polyol, which is a modified polyol;
[0045] The A component and the B component can be combined to form the adhesive according to the molar ratio of functional groups: -NCO: -OH=1.54:1.0.
[0046] The preparation method of the adhesive includes the following steps:
[0047] 1. Preparation of component A:
[0048] (1) Prepare polyester polyol first, including:
[0049] (1) Raw materials: 0.5mol 2-methyl-2,4-pentanediol, 0.8mol 1,6-hexanediol, 0.8mol adipic acid, 0.2mol sebacic acid;
[0050] (2) Preparation steps:
[0051] Add all the small molecular polyols (ie 0.5mol 2-methyl-2,4-pentanediol, 0.8mol 1,6-hexanediol) into the polyester reactor and mix well to form a small molecular polyol ...
Example Embodiment
[0062] Example two
[0063] The embodiment of the present invention provides a solvent-free two-component polyurethane adhesive, which is composed of components A and B, wherein component A is formed by the reaction of polyester polyol and polyisocyanate, which is a modified isocyanate The adduct; B component is polyester polyol, which is a modified polyol;
[0064] The A component and the B component can be combined to form the adhesive according to the molar ratio of functional groups: -NCO: -OH=1.75:1.0.
[0065] The preparation method of the adhesive includes the following steps:
[0066] 1. Preparation of component A:
[0067] (1) Preparation of polyester polyols, including:
[0068] (1) Material preparation: 0.8mol diethylene glycol, 0.2mol ethylene glycol, 0.5mol 1,2-propanediol, 1.0mol adipic acid;
[0069] (2) Preparation steps: refer to the steps of preparing polyester polyol in the preparation of component A in Example 1;
[0070] Prepared polyester polyol with a hydroxyl value...
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