Low-modulus single-component polyurethane sealant for hydraulic engineering and production method thereof
A polyurethane sealant, low-modulus technology, used in polyurea/polyurethane adhesives, adhesives, epoxy resin adhesives, etc., can solve the problems of weak bonding of inorganic materials, unfriendly environment, and long curing time. It can achieve the effect of good anti-ice pulling and ice pushing effect, convenient construction and enhanced bonding performance.
Active Publication Date: 2020-04-17
XINJIANG KENENG WATERPROOF & PROTECTION TECH CO LTD
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Problems solved by technology
[0007] The existing one-component polyurethane sealant has the weakness of foaming, long curing time, short storage period, weak bond with inorganic materials, not friendly to the environment, and high price
Method used
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Embodiment 1
[0024] Low modulus one-component polyurethane sealant for hydraulic engineering,
[0025] The preparation method of above-mentioned hydraulic engineering with low modulus one-component polyurethane sealant comprises the following steps:
[0026] (1) Weigh each component according to the above weight ratio, heat polyether polyol (330N) and polyether polyol (DL-2000) to 110°C, and dehydrate for 2 hours to form anhydrous polyether polyol;
[0027] (2) Then add diphenylmethane diisocyanate (MDI), and then add a part of the toughening agent to reduce the four-line oil at a constant temperature of 80°C for 3 hours to obtain a PU prepolymer;
[0028] (3) Add a silane coupling agent (KH-590) after cooling down to 60°C for 30 minutes to obtain a SPU prepolymer;
[0029] (4) Finally, add powdered filler, catalyst (T-12), and remaining toughening agent (same as the type of toughening agent added earlier, all of which can activate plasticizing effect, and the addition of the previous pla...
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Abstract
The invention discloses low-modulus single-component polyurethane sealing gum for hydraulic engineering, and a production method thereof. The low-modulus single-component polyurethane sealing gum for hydraulic engineering is prepared from polyether polyol, methylene diphenyl diisocyanate, vacuum distillate line oil, a silane coupling agent, a T-12 catalyst, a latent curing agent, epoxy resin, a non-active diluent, powdered fillers, white carbon black, carbon black and an antioxidant. The low-modulus single-component polyurethane sealing gum for hydraulic engineering and the production method thereof have the following advantages: the low-modulus single-component polyurethane sealing gum for hydraulic engineering overcomes the foaming weakness, has excellent viscosity with concrete and is environment-friendly; meanwhile, the production cost is reduced, the shelf life is prolonged, the curing time is shortened, curing formation and ice have low adhesive property, and the effect of resisting ice pull and ice push can be achieved effectively. The material has excellent performance and a plurality of hydraulic engineering characteristic indexes, and can effectively improve the sealing and water stop effects of the hydraulic architecture, enhance the safety and prolong the service life.
Description
technical field [0001] The invention relates to a polyurethane sealant, in particular to a low-modulus single-component polyurethane sealant for hydraulic engineering and a production method thereof, belonging to the field of sealing materials for hydraulic engineering. Background technique [0002] Polyurethane sealant is a material used to fill gaps (holes, joints, seams, etc.), and has two functions of bonding and sealing. The single-component is mainly compared with the two-component, there is only one component, no need for on-site measurement and deployment, it can be used directly, and the construction is simple. The one-component polyurethane adhesive is cured by reacting with a small amount of water vapor in the air, and reacts with active groups on the surface of the substrate to play a bonding role. [0003] According to the industry standard JC / T482-2003 "Polyurethane Building Sealant" 25 LM type, the density of polyurethane building sealant is the specified val...
Claims
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IPC IPC(8): C09J175/08C09J191/00C09J163/00C09J11/04C09J11/06C09J11/00C08G18/76C08G18/66C08G18/48C08G18/38C08G18/12
CPCC08G18/12C08G18/4804C08G18/7671C08L2205/03C09J11/00C09J11/04C09J11/06C09J175/08C08G18/288C08L91/00C08L63/00C08K13/06C08K9/04C08K2003/023C08K3/36C08K3/04
Inventor 曹登云任银霞朱永斌
Owner XINJIANG KENENG WATERPROOF & PROTECTION TECH CO LTD
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