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MDI trimer curing agent and method for preparing same
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A technology of trimerization catalyst and curing agent, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of harsh process conditions, high equipment investment and production cost, and achieve less equipment investment and reduce The effect of reducing the amount of matte powder and reducing costs
Inactive Publication Date: 2012-05-30
武汉仕全兴新材料科技股份有限公司
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Problems solved by technology
Its equipment investment and production costs are too high, and the process conditions are harsh, so it is not suitable for the production of MDI trimer
Method used
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Embodiment 1
[0023] Add 180g of diphenylmethylene diisocyanate MDI-50 into a four-necked flask with a condenser and nitrogen protection, add 80g of butyl acetate and 80g of ethyl acetate, start stirring, heat up to 50°C, add 0.5 gN, N dimethylbenzylamine trimerization catalyst, dropwise add 2.7g of molecular weight regulator diphenyl dichlorosilane dissolved in 22.7g of ethyl acetate, add dropwise in about one hour, keep warm for reaction, and control the temperature at 65±5 °C, detect the NCO content every hour, when the total NCO content drops to about 7%-8%, lower the temperature to 40 °C, add 0.02g benzoyl chloride polymerization inhibitor to terminate the reaction, and discharge.
Embodiment 2
[0025] Add 180g of diphenylmethylene diisocyanate MDI-50 into a four-necked flask with a condenser and nitrogen protection, add 80g of butyl acetate and 80g of ethyl acetate, start stirring, heat up to 50°C, add 0.20 g triethylphosphine, add 2g of molecular weight modifier diphenyldichlorosilane dissolved in 22g of ethyl acetate dropwise, add dropwise for about one hour, keep warm for reaction, control the temperature at 55±5°C, and detect NCO every hour content, when the total NCO content drops to about 7%-8%, drop the temperature and add 0.02g benzoyl chloride polymerization inhibitor to terminate the reaction and discharge.
Embodiment 3
[0027] Add 180g of diphenylmethylene diisocyanate MDI-40 into a four-necked flask with a condenser and nitrogen protection, add 160g of ethyl acetate, start stirring, heat up to 50°C, add 0.18g of tri-n-butyl Phosphine trimerization catalyst, add 1.8g of molecular weight regulator ethylphenyl dichlorosilane dissolved in 21.8g of ethyl acetate dropwise, drop it in about an hour, keep warm for reaction, control the temperature at 60±5°C, every hour Detect the NCO content, when the total NCO content drops to 7%-8%, drop the temperature and add 0.02g benzoyl chloride polymerization inhibitor to terminate the reaction, and discharge.
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Abstract
The invention discloses an MDI tripolymer firming agent and a method for preparing the same. The invention solves the problems that in the prior art, the MDI tripolymer firming agent prepared by membrane evaporation and other methods generates mass multimers caused by overlarge polymerization degree, has wide distribution of homogenous molecular weight, poor miscibility with resin, etc. The technical proposal comprises the following steps that: MDI and a trimeric catalyzer have trimerization reaction in a solvent and are added with a molecular weight modifying agent; after the reaction is completed, a polymerization inhibitor is added in the solvent to terminate the reaction, thereby preparing the MDI tripolymer firming agent; the adding amount of the trimeric catalyzer is 0.1 to 0.3 percent of the MDI mass; and the adding amount of the molecular weight modifying agent is 1 to 1.5 percent of the DMI mass. 2,4'-diphenylmethane diisocyanate in the MDI at least accounts for 50 percent ofthe DMI mass. The preparation method has low production cost and simple process equipment; the prepared firming agent has the advantages of healthiness, environmental protection, low cost, good miscibility with resin, etc. and can be applied in the fields of dope, bond, adhesive, elastomer, etc.
Description
technical field [0001] The invention relates to a curing agent used in coatings, adhesives and elastomers and a preparation method thereof, in particular to an MDI trimer curing agent and a preparation method thereof. Background technique [0002] The trimer products currently on the market are mainly TDI trimer, HDI trimer, IPDI trimer, TDI and HDI mixed trimer, TDI and MDI mixed trimer, and MDI due to its own structure and production process Due to reasons such as product performance and product performance, there is currently no trimer product prepared from MDI monomer on the market. [0003] The following is the trimerization reaction formula of diisocyanate. During the reaction process, the degree of reaction is different, and some side reactions will occur when trimers are formed, such as dimers, tetramers and large molecular weight polymers. wait. [0004] [0005] Due to the difference in molecular structure between MDI (diphenylmethane diisocyanate) and TDI (to...
Claims
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