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Preparation method of quickly positioned polyurethane sealant

A polyurethane sealant, fast technology, applied in the direction of polyurea/polyurethane adhesives, chemical instruments and methods, adhesives, etc., can solve the problems of waiting for a long time, save process efficiency, unfavorable production costs, etc., to shorten the process interval time, process efficiency, cost savings

Active Publication Date: 2014-12-03
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the positioning of the existing polyurethane sealant is relatively slow, and it is often necessary to wait for a long time after construction (generally 7 days at room temperature) before proceeding to the next step, resulting in prolongation of the construction process, which is not conducive to saving production costs and improving process efficiency

Method used

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  • Preparation method of quickly positioned polyurethane sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing quick positioning polyurethane sealant, the steps are as follows:

[0024] (1) Take 125kg of polyoxypropylene triol and glycol copolymer with molecular weight of 5000 and 219kg of polyoxypropylene glycol with molecular weight of 4000 to mix and react with 55kg MDI at 85℃ for 3h. The measured NCO endpoint is 2.60%. Prepare prepolymer A for later use; take 80 kg of polyhexylene adipate diol with a molecular weight of 3000 and 88 kg of polybutylene phthalate diol with a molecular weight of 2000 and mix them with 35 kg of MDI at 100°C. 1.5h, the measured NCO endpoint is 2.80%, prepare prepolymer B for use;

[0025] (2) Dehydrate the heavy calcium carbonate and carbon black in an oven at 110°C for 48 hours and keep it heated for standby; detect the water content of the plasticizer DOP and control its water content to be less than 0.05% for standby;

[0026] (3) Add 20kg of plasticizer DOP of step (2), 30kg of prepolymer A and 20kg of prepolymer B of step (1)...

Embodiment 2

[0030] A method for preparing quick positioning polyurethane sealant, the steps are as follows:

[0031] (1) Take 125 kg of polyoxypropylene triol and glycol copolymer with molecular weight of 5000 and 120 kg of polyoxypropylene glycol with molecular weight of 2000 to mix and react with 45kg of MDI at 85°C for 3 hours. The measured NCO endpoint is 2.35%. Prepare prepolymer A for use; take 70 kg of polybutylene adipate diol with molecular weight of 3000 and 88 kg of poly(ethylene phthalate glycol) with molecular weight of 1600 and mix with 35 kg of MDI at 100°C After reacting for 1.5 hours, the NCO end point was measured to be 2.45%, and prepolymer B was prepared for use;

[0032] (2) Dehydrate the light calcium carbonate, carbon black and meteorological silicon powder in an oven at 110°C for 48 hours and keep it heated for standby; detect the water content of the plasticizer DINP and control its water content to less than 0.05% for standby;

[0033] (3) Add 18kg of plasticizer DINP ...

Embodiment 3

[0037] A method for preparing quick positioning polyurethane sealant, the steps are as follows:

[0038] (1) Take 150kg of polyoxypropylene triol and glycol copolymer with a molecular weight of 6000 and 120kg of polyoxypropylene glycol with a molecular weight of 2000, and mix them with 30kg of IPDI at 85°C for 3h. The measured NCO endpoint is 2.80%. Prepare prepolymer A for later use; take 100 kg of polyhexylene sebacate diol with a molecular weight of 4000 and 88 kg of polyethylene phthalate diol with a molecular weight of 1600 and mix with 40 kg of MDI at 100°C Under the conditions, the reaction time is 1.5h, the NCO end point is 2.90%, and the prepolymer B is prepared for use;

[0039] (2) Dehydrate the light calcium carbonate, carbon black and titanium dioxide in an oven at 110°C for 48 hours, and keep it heated for standby; detect the water content of the plasticizer DINP and control its water content to less than 0.05% for standby;

[0040] (3) Add 18kg of plasticizer DINP of ...

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Abstract

The invention belongs to the technical field of sealant preparation and in particular relates to a preparation method of a quickly positioned polyurethane sealant. The preparation method comprises the following steps: polymerizing polyether polyol and polyester polyol with polyisocyanate to obtain two prepolymers, adding a plasticizer, the two prepolymers and a dehydrating agent to a planetary stirring kettle, introducing hot water to the kettle and stirring in vacuum, next, adding a filler, introducing cold water and stirring in vacuum, and finally, adding a coupling agent and a catalyst and stirring to obtain the polyurethane sealant. According to the preparation method of the quickly positioned polyurethane sealant, the two prepolymers, which are obtained by virtue of the polymerization reactions between the polyether polyol and the polyester polyol, and the polyisocyanate, respectively, are further mixed with other components, the obtained polyurethane sealant can be positioned quickly, and relatively high strength can be achieved in 4 hours after the sealant is used; as a result, the process interval time is greatly shortened, the cost is saved, and meanwhile, the process efficiency is improved; the polyurethane sealant can be applied to bonding and sealing structures such as automobiles, trains and aircraft.

Description

Technical field [0001] The invention belongs to the technical field of sealant preparation, and in particular relates to a method for preparing a quick positioning polyurethane sealant. Background technique [0002] Polyurethane sealant is a sealant with polyurethane prepolymer as the main component. This type of sealant has the advantages of high tensile strength, excellent elasticity, abrasion resistance, oil resistance and cold resistance. It is widely used in the preparation of caulking and sealing materials for buildings, squares and highways, as well as automobile manufacturing, glass installation, Electronic filling, submarine and rocket sealing. However, the existing polyurethane sealants are relatively slow in positioning. After construction, they often need to wait a long time (generally curing at room temperature for 7 days) before proceeding to the next step. This results in a prolonged construction process, which is not conducive to saving production costs and impro...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J175/06C09J11/04C09J11/06C08G18/48C08G18/42C09K3/10
Inventor 刘文涛王建斌陈田安解海华
Owner YANTAI DARBOND TECH
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