Polyisocyanate Composition for Low Viscosity and Weather Fastness
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Solution Overview
Problem
Polyisocyanate compositions derived from aliphatic diisocyanates, such as those with isocyanurate and iminooxadiazinedione groups, often have low crosslinking properties and insufficient solvent resistance and weather fastness when used in aqueous or polyaspartic paint compositions.
Innovation Solution
A polyisocyanate composition comprising an isocyanurate group, an iminooxadiazinedione group, and a specific ratio of pentamer derived from aliphatic diisocyanate, with an allophanate group, which is formulated to achieve low viscosity, excellent water dispersibility, and enhanced solvent resistance and weather fastness in coating films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polyisocyanate composition has isocyanurate group and iminooxadiazinedione group, then viscosity is lowered and water dispersibility is improved, but crosslinking properties and solvent resistance are insufficient
Solution Approach 1:
The invention changes the molecular weight distribution parameters by controlling the ratio of trimers to pentamers. Specifically, it maintains iminooxadiazinedione trimer content at 1-50 mass% and isocyanurate trimer content at 1-50 mass%, while controlling pentamer content at 10-80 mass%. This parameter optimization achieves low viscosity through small molecular weight components while maintaining crosslinking properties through appropriate pentamer content.
Solution Approach 2:
The invention creates a composite polyisocyanate composition containing multiple types of molecules with different functions: iminooxadiazinedione groups for water dispersibility, isocyanurate groups for crosslinking, and controlled pentamer content for balancing viscosity and performance. This composite approach resolves the contradiction by combining components that individually address different requirements.
2Ease of operation
If polyisocyanate composition has isocyanurate group and iminooxadiazinedione group, then viscosity is lowered and water dispersibility is improved, but solvent resistance and weather fastness are insufficient
Solution Approach 1:
The invention optimizes the molecular weight distribution parameters by controlling the ratio of trimers to pentamers. Specifically, it maintains iminooxadiazinedione trimer content at 1-50 mass% and isocyanurate trimer content at 1-50 mass%, while controlling pentamer content at 10-80 mass%. This parameter optimization achieves low viscosity through small molecular weight components while maintaining crosslinking properties through appropriate pentamer content.
Solution Approach 2:
The invention creates a composite polyisocyanate composition containing multiple types of molecules with different functions: iminooxadiazinedione groups for water dispersibility, isocyanurate groups for crosslinking, and controlled pentamer content for balancing viscosity and performance. This composite approach resolves the contradiction by combining components that individually address different requirements.
3Ease of operation
If polyisocyanate composition contains iminooxadiazinedione group, then dispersibility in water is improved, but coating film weather fastness is insufficient
Solution Approach 1:
The invention optimizes the molecular weight distribution parameters by controlling the ratio of trimers to pentamers. Specifically, it maintains iminooxadiazinedione trimer content at 1-50 mass% and isocyanurate trimer content at 1-50 mass%, while controlling pentamer content at 10-80 mass%. This parameter optimization achieves low viscosity through small molecular weight components while maintaining crosslinking properties through appropriate pentamer content.
Solution Approach 2:
The invention creates a composite polyisocyanate composition containing multiple types of molecules with different functions: iminooxadiazinedione groups for water dispersibility, isocyanurate groups for crosslinking, and controlled pentamer content for balancing viscosity and performance. This composite approach resolves the contradiction by combining components that individually address different requirements.
Data Source
AI summary
A polyisocyanate composition having a low viscosity and having excellent dispersibility in water and being capable of forming a coating film having excellent solvent resistance in a case of being used in an aqueous paint composition and being capable of forming a coating film having excellent weather fastness in a case of being used in a polyaspartic paint composition is provided. The polyisocyanate composition that is obtained from aliphatic diisocyanate including HDI and has an isocyanurate group and an iminooxadiazinedione group, in which a ratio (A / (A + B)) of a molar weight (A) of an isocyanurate trimer represented by Formula (I) with respect to a total molar weight (A + B) of the molar weight (A) of the isocyanurate trimer and a molar weight (B) of iminooxadiazinedione trimer represented by Formula (II) is 0.1 to 0.9, and a ratio (C) of a molar weight of a pentamer represented by Formula (III) with respect to a total molar weight of a pentamer of the aliphatic diisocyanate included in the polyisocyanate composition is A × B × 2 × 0.9 or more.