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One-component transparent non-yellowing polyurethane sealant and preparation method thereof
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A polyurethane sealant, one-component technology, used in polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc., can solve the problem of easy yellowing, poor bonding strength, curing time and Long and other problems, to achieve the effect of no VOC volatile components, short curing time and high transparency
Active Publication Date: 2021-05-04
SHANGHAI HECHENG POLYMER TECH CO LTD
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Problems solved by technology
[0003] However, ordinary one-component polyurethane sealants have disadvantages such as easy yellowing and poor transparency. Some manufacturers adjust the formula of ordinary polyurethane sealants to use non-yellowing isocyanate to produce polyurethane sealants, which have long curing time, easy foaming, and poor bonding strength. poor disadvantage
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Embodiment 1
[0028] Take 581.2g of HMDI and place it in a reaction vessel, heat it until it is completely clear and transparent, and then cool to room temperature;
[0029] Take 366.5g of polyetheramine D230 and diaminodicyclohexylmethane (PACM) and mix them and stir evenly;
[0030] Feed N into the reaction vessel 2 , and place the reaction vessel in ice water, slowly drop the mixed D230 and PACM into the HMDI, and keep stirring under vacuum;
[0031] Control the reaction temperature at 40-50°C, and keep it warm for 2 hours after the dropwise addition is completed;
[0032] After the heat preservation is completed, the product is tested for NCO, and the actual NCO is measured to be 3%;
[0033] Get reaction to complete polyallophanate prepolymer 650g and be placed in reaction container;
[0034] Add 100g of fumed silica, 250g of dimethylethylene glycol phthalate (DMEP), 2g of latent curing agent ALT-401 into the reaction vessel, start stirring under vacuum conditions, and control the t...
Embodiment 2
[0038] Take 436.9gIPDI and place it in a reaction vessel, heat it until it is completely clear and transparent, and then cool it to room temperature;
[0039] Get 242.7g of polyetheramine D400 and isophoronediamine (IPDA) after mixing and stir evenly;
[0040] Feed N into the reaction vessel 2 , and place the reaction vessel in ice water, slowly drop the mixed D400 and IPDA into IPDI, and keep stirring under vacuum;
[0041] Control the reaction temperature at 40-50°C, and keep it warm for 2 hours after the dropwise addition is completed;
[0042] After the heat preservation is completed, the product is tested for NCO, and the actual NCO is measured to be 3.5%;
[0043] Get reaction to complete polyallophanate prepolymer 550g and be placed in reaction container;
[0044] Add 100g of fumed silica, 350g of dimethylethylene glycol phthalate (DMEP), 1g of latent curing agent ALT-101 into the reaction vessel, start stirring under vacuum conditions, and control the temperature a...
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Abstract
The invention relates to a one-component transparent non-yellowing polyurethanesealant and a preparation method thereof. In parts by weight, the components include: allophanate polyurethaneprepolymer 50-75; gas phasesilicon 5-15; plasticizer Agent 20‑40; latent curing agent 0.1‑2; catalyst 0.1‑0.5. Preparation: Add plasticizer, gas-phase silicon, and latent curing agent to the allophanate polyurethaneprepolymer, stir and disperse under vacuum for 2 hours, and control the temperature below 50°C; after the stirring is completed, add the catalyst, and then Stir and disperse under vacuum for 0.5h, that is. The sealant of the present invention is one-component moisture curing, has short curing time, high transparency, no VOC volatile components, is not easy to generate bubbles, and has high bonding strength. It is suitable for bonding glass and transparent plastics; it can also be used for bonding of lighting and lamps. Knot and seal.
Description
technical field [0001] The invention belongs to the field of polyurethane sealant and its preparation, in particular to a single-component transparent non-yellowing polyurethane sealant and a preparation method thereof. Background technique [0002] Polyurethane sealants are widely used in the automotive industry, construction, and decoration. At present, polyurethane sealants are divided into one-component and two-component according to their components. According to their components, they are divided into polyurethane and modified polyurethane sealants (usually silicone modified , epoxy modification, thiol modification, etc.). Among them, the one-component sealant is favored by the market and construction workers because of its convenient use, no VOC volatilization, various types of bonding materials, good elasticity, and low shrinkage. [0003] However, ordinary one-component polyurethane sealants have disadvantages such as easy yellowing and poor transparency. Some manu...
Claims
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Application Information
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