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Coarse TDI (toluene diisocynate) treating method

A treatment method, technology of toluene diisocyanate, applied in adhesive types, polyurea/polyurethane adhesives, adhesives, etc., can solve problems such as environmental pollution, high cost of tar solid waste, and achieve significant economic benefits, save money, easy-to-manufacture effects

Active Publication Date: 2017-05-31
CANGZHOU DAHUA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a treatment method for crude TDI, which avoids the problems of high cost and environmental pollution in the treatment of tar solid waste in the prior art, can utilize crude TDI to produce polyurethane adhesives, and realizes the resources of crude TDI It can effectively reduce the production of tar solid waste, reduce environmental pollution, and have good economic benefits.

Method used

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  • Coarse TDI (toluene diisocynate) treating method

Examples

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Effect test

Embodiment 1

[0025] S1. Mix crude TDI with polymeric MDI at a mass ratio of 1.1:1 at 150-180°C to generate a modified isocyanate whose viscosity is between 4800-5200mPa·s (mPa·s). , the mass fraction of the isocyanate group contained in the modified isocyanate is 28-30%, that is, the NCO% of the modified isocyanate is 28-30%;

[0026] S2. Put 100g of polyether polyol (MN-3050D) into a clean three-necked bottle, stir, heat up to 105-110°C and reflux, dehydrate for 1 hour, cool down to 50°C, add 50g of butyl acetate, and control the temperature at 40-50°C , slowly add 120g of modified crude TDI under constant stirring, keep warm at 65°C for 1h, then raise the temperature to 80-90°C for prepolymerization reaction, react for 3h, add 60g of butyl acetate to dissolve the prepolymer; at 75°C Add 25g of 1,4-butanediol, raise the temperature to 85-90°C for chain extension reaction, react for 1h, cool down to below 40°C, filter, and discharge. The obtained filtrate is the prepared polyurethane adhe...

Embodiment 2

[0034] S1. Mix crude TDI with polymeric MDI at a mass ratio of 1.1:1 at 150-180°C to generate a modified isocyanate whose viscosity is between 4800-5200mPa·s (mPa·s), The mass fraction of isocyanate groups contained in the modified isocyanate is 28% to 30%;

[0035] S2. Put 70g of polyether polyol DL-2000D and 30g of polyether polyol 330N into a clean three-necked bottle, stir, heat up to 105-110°C and reflux, dehydrate for 1h, cool down to 50°C, add 100g of dimethyl carbonate, control The temperature is 40-50°C, slowly add 100g of modified crude TDI under constant stirring, keep warm at 65°C for 1 hour, then raise the temperature to 80-90°C for polymerization reaction, react for 3 hours, cool down to below 40°C, filter, Discharge. The obtained filtrate is the prepared environment-friendly polyurethane adhesive.

[0036] Polymerized MDI used in the present embodiment is 44V20, produced by Bayer Company;

[0037] Crude TDI is produced by Cangzhou Dahua, which contains about ...

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Abstract

The invention relates to the technical field of synthesizing of TDI (toluene diisocynate), in particular to the technical field of treatment of wastes in the synthesizing process, and discloses a coarse TDI treatment method. The method is characterized in that coarse TDI is modified through polymerized MDI (methylene diphenyl diisocyanate), and thus novel modified isocyanate can be produced and can be used as a raw material for producing a polyurethane adhesive. The production method is simple; the prepared polyurethane adhesive is high in performances. With the adoption of the method, the technical problems in the prior art that the cost of treating coarse TDI in the TDI synthesizing process is high, the generated tar solid wastes are hardly treated and the environment is polluted can be solved; the tar solid wastes can be effectively reduced, and thus the environmental pollution is reduced; and the economic benefit is high.

Description

technical field [0001] The invention relates to the technical field of synthesis of toluene diisocyanate, in particular to the technical field of waste treatment in the synthesis process. Background technique [0002] TDI is the abbreviation of toluene diisocyanate, which is an important basic raw material for the preparation of polyurethane materials. The phosgene method produces TDI. The main process route is to use dinitrotoluene (DNT) to react with hydrogen to generate toluene diamine (TDA), then react it with phosgene to generate TDI, and finally obtain various series of products through purification. , such as TDI80 / 20, which is a mixture containing 80% by mass of 2,4-toluene diisocyanate and 20% by mass of 2,6-toluene diisocyanate. [0003] In the photochemical reaction process of TDI production, a large amount of tar will be produced in the side reaction, which will form a mixture with the TDI produced in the main reaction. After the photochemical reaction product i...

Claims

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Application Information

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IPC IPC(8): C09J175/08C08G18/76
CPCC08G18/7621C08G18/7671C09J175/08
Inventor 谢华生张根山冯炜高志勇张晋秦玉纯
Owner CANGZHOU DAHUA CO LTD
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