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Preparation method for isophorone diisocyanate (IPDI) prepolymer for coating curing

A technology of isophorone diisocyanate and prepolymer, which is applied in the field of preparation of isophorone diisocyanate prepolymer for coating curing, can solve the problems of easy yellowing and poor yellowing resistance, and reach the scope of use Wide range, good yellowing resistance, and the effect of lowering the reaction temperature

Inactive Publication Date: 2012-08-22
SHANGHAI DONGDA POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its yellowing resistance is poor, and it is prone to yellowing in long-term use.

Method used

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  • Preparation method for isophorone diisocyanate (IPDI) prepolymer for coating curing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 100 parts of IPDI, 2 parts of polyether 210 and 0.32 parts of DBTDL into a reaction vessel, raise the temperature to 60°C under the protection of nitrogen, and react for 4 hours to obtain an IPDI prepolymer. Mix 18 parts of TMP with 80 parts of butyl acetate, and dehydrate under reflux at 130° C. for 3 hours through an oil-water separator, and distill 40 parts of butyl acetate. Under the protection of nitrogen, the TMP solution was added dropwise to the IPDI prepolymer, kept at 70° C., and the dropwise addition was completed within 3 hours. Add 0.02 parts of 2,4,6-tris(dimethylaminomethyl)phenol, keep warm at 70°C for 2 hours, measure NCO at 12.15% by toluene-di-n-butylamine method, add 0.05 parts of benzoyl chloride and stir for 30 minutes, cool down Discharge at 40°C, and store under nitrogen gas seal.

[0021] For the compatibility test, 10.17 g of the curing agent prepared in Example 1 and 100 g of the hydroxyacrylic resin were uniformly mixed to obtain a mixed...

Embodiment 2

[0023] Add 100 parts of IPDI, 4 parts of polyether 220 and 0.4 parts of DBTDL into a reaction vessel, raise the temperature to 70°C under the protection of nitrogen, and react for 1.5 hours to obtain an IPDI prepolymer. Mix 16 parts of TMP with 60 parts of butyl acetate, and dehydrate under reflux at 130° C. for 2 hours through an oil-water separator, and distill 20 parts of butyl acetate. Under the protection of nitrogen, the TMP solution was added dropwise to the IPDI prepolymer, kept at 70° C., and the dropwise addition was completed within 3 hours. Add 0.02 parts of 2,4,6-tris(dimethylaminomethyl)phenol, keep warm at 70°C for 2 hours, measure NCO at 12.35% by toluene-di-n-butylamine method, stir 0.05 parts of benzoyl chloride for 30 minutes, cool down to Discharge at 40°C and store in a nitrogen atmosphere.

[0024] For the compatibility test, 10.00 g of the curing agent prepared in Example 2 and 100 g of the hydroxyacrylic resin were uniformly mixed to obtain a mixed liq...

Embodiment 3

[0026] Add 100 parts of IPDI, 4 parts of polyether 303 and 0.2 parts of DBTDL into a reaction vessel, raise the temperature to 60°C under the protection of nitrogen, and react for 3 hours to obtain an IPDI prepolymer. Mix 12 parts of TMP with 60 parts of butyl acetate, and dehydrate under reflux at 130°C for 3 hours through an oil-water separator, and distill 20 parts of butyl acetate. Under the protection of nitrogen, the TMP solution was added dropwise to the IPDI prepolymer, kept at 60° C., and the dropwise addition was completed within 3 hours. Add 0.02 parts of 2,4,6-tris(dimethylaminomethyl)phenol, keep warm at 60°C for 2 hours, measure NCO at 11.50% by toluene-di-n-butylamine method, add 0.1 parts of 85% phosphoric acid and stir for 30 minutes, cool down Discharge at 40°C, and store under nitrogen gas seal.

[0027] For the compatibility test, 10.74 g of the curing agent prepared in Example 3 and 100 g of the hydroxyacrylic resin were uniformly mixed to obtain a mixed ...

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Abstract

The invention relates to a preparation method for an isophorone diisocyanate (IPDI) prepolymer for coating curing. The preparation method comprises the following steps of: performing reaction on IPDI and polyether polyol for 1-4 hours in a reaction vessel under the existence of a catalyst to prepare the IPDI prepolymer; dropwise adding Trimethoprim (TMP) after being azeotropically dehydrated by a solvent for 2-6 hours step by step; adding trimerization catalyst; and when a theoretical NCO content is reached, adding a polymerization inhibitor to obtain the IPDI prepolymer. Two-step reaction is adopted by the preparation method; on the basis of one-step method, i.e. addition reaction, free IPDI monomers are removed by a trimerization method. The obtained IPDI prepolymer as a coating curing agent has good compatibility and film forming property on hydroxy acrylic resin, and has the advantages that the application range is wide, the strength is high, the yellowing resistance is good, the toxicity is low, the storage stability is high, and a high-solid content product can be obtained.

Description

technical field [0001] The invention relates to a preparation method of an isophorone diisocyanate prepolymer for coating curing. Background technique [0002] Polyurethane coating film has good appearance, high hardness, corrosion resistance and chemical resistance. It is the largest variety of solvent-based coatings. The amount of polyurethane coatings in home furnishing and home decoration has always been relatively large. One component is based on alkyd resin, polyester resin and acrylic resin and other hydroxyl-containing substances, and the other component contains active NCO groups, which can cross-link with resin components containing active hydroxyl groups to form paint films with various properties. called curing agent. In the polyurethane curing agent for coatings, due to the insufficient selectivity of the reaction between NCO groups and hydroxyl groups, a small amount of monomers do not participate in the reaction and remain in the system. During the constructi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/32C08G18/24C09D175/04
Inventor 董建国张立柱李心强曹小伟
Owner SHANGHAI DONGDA POLYURETHANE
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