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Coating composition containing hyperbranched blocked polyisocyanate

A polyisocyanate and isocyanate technology, applied in the field of coatings, can solve problems such as unfavorable application, high viscosity, and inability to effectively form high crosslinking density paint films

Active Publication Date: 2015-09-09
NIPPON PAINT IND COATINGS SHANGHAI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method greatly reduces the functionality of the hyperbranched resin and weakens the advantages of the high functionality of the hyperbranched resin, which is unfavorable for the preparation of high hardness and high chemical resistance coatings
[0004] Because blocked polyisocyanate is easy to handle and is not sensitive to atmospheric humidity, it can be used to prepare one-component polyurethane coatings with sufficient storage stability. However, the functionality of blocked polyisocyanates currently on the market is between 2 and 4. It cannot effectively form a paint film with high crosslinking density, and there are also defects that the viscosity is too high, which is not conducive to application

Method used

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  • Coating composition containing hyperbranched blocked polyisocyanate
  • Coating composition containing hyperbranched blocked polyisocyanate
  • Coating composition containing hyperbranched blocked polyisocyanate

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example

[0106]

[0107]

Embodiment 1

[0109] B1: Synthesis of H40-25% IPDI-CAP (25% of the hydroxyl groups of the hyperbranched resin H40 are replaced by IPDI-caprolactam)

[0110] Synthesis of IPDI-caprolactam semi-blocked prepolymer (IPDI-CAP)

[0111] At room temperature, mix 100.0 parts of IPDI, 50.9 parts of caprolactam, 226.3 parts of cyclohexanone and 0.37 parts of dibutyltin dilaurate (DBTDL) according to the mass ratio, heat and stir the mixture to 65°C under the protection of nitrogen, and keep it warm at 65°C for reaction 2 to 3 hours until NCO % reaches 5.0% wt.

[0112] Synthesis of H40-25% IPDI-CAP

[0113] Under the protection of nitrogen, 100 parts of BoltronH40 and 150 parts of cyclohexanone were mixed according to the mass ratio, and the mixture was heated and stirred to 110°C until all the H40 was dissolved. After cooling down to 80°C, 187 parts of IPDI-CAP semi-blocked prepolymer was added dropwise at a uniform speed, and the addition was completed in about 30 minutes. Insulate the reaction ...

Embodiment 2

[0116] B2: Synthesis of H40-50%-IPDI-CAP (50% of the hydroxyl groups of hyperbranched resin H40 are replaced by IPDI-caprolactam)

[0117] Same as the step of Example 2, the difference is that the amount of the IPDI-CAP semi-blocked prepolymer is doubled to 374 parts, and the light yellow solution of the gained is: 50% H40 hydroxyl group is covered by IPDI-caprolactam semi-blocked prepolymer (IPDI -CAP) substituted hyperbranched blocked polyisocyanate, the final product is adjusted to a solid content of 40% with cyclohexanone.

[0118] attached figure 1 Be the pyrolysis gas chromatography-mass spectrogram of present embodiment product, by figure 1 The functional group situation of the synthesized product of this embodiment can be known.

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Abstract

The present invention discloses a coating composition containing hyperbranched blocked polyisocyanate. The composition comprises at least one hyperbranched blocked polyisocyanate with a structural formula (I) shown in the specification. In the formula (I), (HBP) is a hyperbranched hydroxyl polyester skeleton; U is an alkyl group of isocyanate; BL is a blocking agent of isocyanate; the sum of m + n is no less than 2 and no greater than the sum of functional groups of hydroxyl polyester, and m and n are positive integers. Hyperbranched blocked polyisocyanate is introduced into the coating composition, so that the effects of increasing the cross-linking density of a coating and improving the hardness, scratch resistance and chemical corrosion resistance of a paint film can be achieved.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a coating composition containing hyperbranched blocked polyisocyanate. Background technique [0002] Hyperbranched polymers are highly branched macromolecules with a three-dimensional branched structure. The molecular structure is relatively regular and has a narrow relative molecular mass distribution. It has a similar structure to dendritic polymers, but the synthesis method is simple. Generally, it can be synthesized in one step. Polymerization synthesis. Because the macromolecule has a compact structure similar to a sphere, the hydrodynamic radius of gyration is small, the degree of branching is high, and the molecular chains are less entangled, the viscosity changes little with the increase of the relative molecular mass. Moreover, macromolecules have many functional end groups, which have a very important impact on the entire hyperbranched polymer. The properties of hyper...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D7/12C08G18/42C08G18/80
Inventor 施珠容李世冰胡剑汪少锋萧正铭
Owner NIPPON PAINT IND COATINGS SHANGHAI
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