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Blocked isocyanate composition, prepolymer composition, method for producing these, and thermally dissociative blocking agent of blocked isocyanate composition

A technology of blocking isocyanate and isocyanate, which is applied in the field of blocked isocyanate composition, prepolymer composition and its manufacture, and as a thermal dissociative blocking agent of blocked isocyanate composition, can solve environmental impact, lack of Practicality, toxic sulfurous acid gas and other issues, to achieve the effect of inhibiting the emission of formaldehyde

Pending Publication Date: 2018-07-17
DAIEI SANGYO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, blocking agents such as hydrogen sulfites leave sulfites in the hardened product and generate toxic sulfurous acid gas when thermally decomposed, so there is a concern that it will have a significant impact on the environment.
In addition, Patent Document 6 discloses an end-blocking agent of a polyamine compound or a thiol compound. However, in this example, sulfurous acid gas is generated during production or dissociation of the end-blocking agent, so it is not practical.

Method used

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  • Blocked isocyanate composition, prepolymer composition, method for producing these, and thermally dissociative blocking agent of blocked isocyanate composition
  • Blocked isocyanate composition, prepolymer composition, method for producing these, and thermally dissociative blocking agent of blocked isocyanate composition
  • Blocked isocyanate composition, prepolymer composition, method for producing these, and thermally dissociative blocking agent of blocked isocyanate composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0205] a) Step 1

[0206] First, put 60 parts of 28% ammonia water and 20 parts of dioxane (as an aprotic polar organic solvent) into a separable flask with a reflux condenser, and keep the temperature at 1000 rpm while stirring. 25°C.

[0207] b) Step 2

[0208] Next, in a separable flask, 100 parts of diphenylmethane diisocyanate (MDI) was slowly added over 1 hour to obtain a liquid blocked isocyanate solution at normal temperature (reaction temperature: 25° C.). The blocked isocyanate solution was vacuum-dried at 60° C. to obtain a solid blocked isocyanate (blocked isocyanate of Example 1). The recovery rate of the blocked isocyanate of Example 1 was 92%.

[0209] c) Step 3

[0210] Next, 100 parts of the blocked isocyanate of Example 1 were dispersed and mixed in an aqueous solution obtained by adding a 25% polyvinyl alcohol aqueous solution so that the solid content ratio became 60 parts (that is, as shown in the table of FIG. 2 ). , mixed 100 parts of blocked isocya...

Embodiment 2

[0213] a) Step 1

[0214] First, 40 parts of 28% ammonia water and 20 parts of dioxane (as an aprotic polar organic solvent) were placed in a separable flask with a reflux condenser, and the temperature was maintained at 1000 rpm while stirring at 1000 rpm. 25°C.

[0215] b) Step 2

[0216] Next, in a separable flask, 100 parts of diphenylmethane diisocyanate (MDI) was slowly added over 1 hour to obtain a liquid blocked isocyanate solution at normal temperature (reaction temperature: 25° C.). The blocked isocyanate solution was vacuum-dried at 60° C. to obtain a solid blocked isocyanate (blocked isocyanate of Example 2). The recovery rate of the blocked isocyanate of Example 2 was 95%.

[0217] c) Step 3

[0218] Next, 100 parts of blocked isocyanate was dispersed and mixed in an aqueous solution obtained by adding a 25% polyvinyl alcohol aqueous solution so that the solid content ratio became 60 parts (that is, as shown in the table of FIG. Mix 100 parts of blocked isocy...

Embodiment 3

[0220] a) Step 1

[0221] First, in a separable flask with a reflux condenser, 60 parts of 28% ammonia water, 20 parts of dioxane (as an aprotic polar organic solvent) and 20 parts of acetone (amphiphilic) were placed. Stirring was performed at 1000 rpm while maintaining the temperature at 25°C.

[0222] b) Step 2

[0223] Next, in a separable flask, 100 parts of diphenylmethane diisocyanate (MDI) was slowly added over 1 hour to obtain a liquid blocked isocyanate solution at normal temperature (reaction temperature: 25° C.). The blocked isocyanate solution was vacuum-dried at 60° C. to obtain a solid blocked isocyanate (blocked isocyanate of Example 3). The recovery rate of the blocked isocyanate of Example 3 was 93%.

[0224] c) Step 3

[0225]Next, 100 parts of blocked isocyanate was dispersed and mixed in an aqueous solution obtained by adding a 25% polyvinyl alcohol aqueous solution so that the solid content ratio became 60 parts (that is, as shown in the table of FIG....

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PUM

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Abstract

[Problem] To impart low-temperature thermosetting properties superior to those of a phenolic-resin prepolymer to a prepolymer that is a mixture of a blocked isocyanate compound and an isocyanate-reactive compound, as well as to provide a thermosetting plastic that is a thermally cured product of the prepolymer at a cost equivalent to that of a phenolic resin without exerting harmful effects on theenvironment during thermal curing, and to suppress the emission of formaldehyde. [Solution] At least one thermally dissociative blocking agent selected from the group consisting of ammonia and ammonium salts is used as a thermally dissociative blocking agent capable of reacting with isocyanate compounds and dissociating at very low temperatures, the thermally dissociative blocking agent blockingisocyanate groups of the isocyanate compound by urea terminations.

Description

technical field [0001] The present invention relates to a blocked isocyanate composition, a prepolymer composition which is a mixture of a blocked isocyanate compound and an isocyanate-reactive compound, a method for producing the same, and a thermally dissociable blocking agent for the blocked isocyanate composition, especially Regarding the low-temperature dissociative blocked isocyanate composition, the low-temperature thermosetting prepolymer composition containing the blocked isocyanate composition, its production method, and ammonia or ammonium salt as the blocked isocyanate composition The application of the low temperature dissociation type thermal dissociation capping agent used. Background technique [0002] In the past, phenol resins and prepolymers of phenol resins were mostly used in thermal insulation materials, plywood, wood panels, electrical products, and automotive interior parts that required strength. Phenol resin products have a problem in that sick hou...

Claims

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Application Information

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IPC IPC(8): C08G18/80
CPCC08G18/2865C08G18/6212C08G18/755C08G18/7671C08G18/808C08G18/80C08K5/17C08G18/10C08K3/28C08L75/04
Inventor 冈本安史铃木静
Owner DAIEI SANGYO
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