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Polyisocyanate composition having allophanate group and high-solid coating material

A polyisocyanate and allophanate technology, applied in polyurea/polyurethane coatings, coatings, thin material processing, etc., can solve problems such as difficult industrial production

Inactive Publication Date: 2004-12-22
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyisocyanates formed using aliphatic (cycloaliphatic) triisocyanates tend to form harder and more brittle coating films than conventional polyisocyanates formed using HDI, etc.; and have limited availability, and therefore, are currently difficult to use industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0174] Embodiment 1 (synthesis example of polyisocyanate composition)

[0175] Polyisocyanate P-1 and polyisocyanate P-2 were mixed at a weight ratio of 30 / 70 to obtain polyisocyanate a-1 of Example 1. NCO% of polyisocyanate a-1 = 18.7% and viscosity = 571 mPa·s. Data such as molecular weight etc. are shown in Table 1.

Embodiment 2-5

[0176] Embodiment 2-5 (synthesis example of polyisocyanate composition)

[0177] Polyisocyanates P-1 to P-5 were mixed to obtain polyisocyanates a-2 to a-6, respectively. The mixing ratio (weight ratio) in each of the obtained polyisocyanates is shown in Table 2. The physical properties of polyisocyanates a-2 to a-6 are shown in Table 1.

Embodiment 7

[0178] Embodiment 7 (synthesis example of polyisocyanate composition)

[0179] 1244 grams of HDI, 16.5 grams of isobutanol, and 38.9 grams of triethylene glycol were charged to the same apparatus as in Monoallophanate Product Synthesis 1. The carbamate forming reaction was carried out at 90° C. for 1 hour with stirring. The temperature was raised to 130° C., and then 0.43 g, 20% solids, of zirconyl 2-ethylhexanoate in mineral spirits was added as an allophanate forming catalyst. After 30 minutes, when the refractive index of the reaction liquid increased by 0.0055, 0.17 grams (2.2 times more than the number of moles of the allophanate-forming catalyst) of 50% solid content of isobutanol solution of pyrophosphoric acid were added thereto to Stop the reaction.

[0180] According to NMR measurements of the reaction liquid, the final molar ratio of allophanate groups to isocyanurate groups was 97:3.

[0181] Then, unreacted HDI was removed under conditions similar to Synthesis ...

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Abstract

A polyisocyanate composition comprising an allophanate group, which is obtained from an aliphatic diisocyanate(s), wherein in a state substantially free of a solvent and the aliphatic diisocyanate(s), (i) the content of components having a molecular weight of 700 or less is 20-60 weight %, (ii) the ratio of weight average molecular weight to number average molecular weight is 1.20-5.00, (iii) the ratio of viscosity (unit: mPa.s) of the polyisocyanate composition at 25 DEG C to the number average number of functional groups of isocyanate groups is represented by the following expression: viscosity (mPa.s) / number average number of functional groups ≤ 240.

Description

technical field [0001] The present invention relates to polyisocyanate compositions containing allophanate groups and a process for their production, and to polyisocyanate-containing compositions and polyol coating compositions as binders. Background technique [0002] Aliphatic polyisocyanates have been widely used as paint curing agents excellent in weather resistance. In particular, polyisocyanates produced from hexamethylene diisocyanate (hereinafter referred to as HDI) have been widely used in various applications such as building construction, automobiles, and the like. However, polyisocyanates obtained by oligomerization of diisocyanates have relatively high viscosity and, in many cases, require dilution with various organic solvents before use. However, in the field of paints, the reduction of the amount of organic solvents is an urgent problem to be solved in consideration of environmental protection against air pollution and saving of raw materials. In this case,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/62C08G18/78C08G18/80C09D175/04
CPCC08G18/6229C08G18/7837C08G18/8016C09D175/04C08G18/8064Y10T428/31551C08G18/78
Inventor 渡边慎一郎直井邦夫
Owner ASAHI KASEI KK
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