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Coating compositions for inorganic substrates

A technology of inorganic substrates and compositions, applied in the directions of coating, thin material handling, transportation and packaging, which can solve the problems of radiation-grafted fluoropolymers that are not mentioned

Inactive Publication Date: 2011-02-09
ARKEMA FRANCE SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This system is less effective than radiation grafted fluoropolymers
[0014] None of these prior art documents mention radiation-grafted fluoropolymers that can be used to form coatings on inorganic substrates

Method used

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  • Coating compositions for inorganic substrates
  • Coating compositions for inorganic substrates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] Using preformulated PVDF-acrylic powder coatings and grafted PVDF, powder blends were prepared by dry blending as follows: Using a dry blend mill, 70 samples of formulated PVDF-acrylic powder coatings (formulated by 24-27 parts of acrylic resin, 56-63 parts of PVDF resin and 10-20 parts of pigment, melt blended, and then cryogenically ground; the powder has an average size of 45 μm, and the distribution is 10 to 100 μm) with 30 parts of modified PVDF ( ADX111) for blending. This homogeneous powder blend is used for coating.

[0135] The dry powder blend was applied to unprimed aluminum chromate panels by electrostatic spraying. The powder coated panels were then baked in a convection oven at 450°F for 10 minutes. A very smooth, defect-free coating is obtained. The coating was tested by the following methods: direct cross-hatch adhesion (AAMA2605-987.4.1.1) and reverse impact (AAMA2605-987.5.1.1 & NCCA4.2.6), cross-hatch adhesion / Inversion Shock (NCCA4.2.1.0), Boi...

Embodiment 2

[0136] Embodiment 2 (contrast):

[0137] with no PVDF-acrylic powder coating of Example 1 of ADX111 coated aluminum panels. The coating is tested for checkerboard adhesion, direct impact and indirect impact. However, after exposure to boiling water, adhesion failure was noted in both the checkerboard adhesion and particularly the checkerboard adhesion / reversal impact test. Chips of the coating were shed from the strip, and coating delamination occurred in the reverse impact test.

Embodiment 3

[0138] Embodiment 3 (comparison)

[0139] With the powder formula of embodiment 2 (without any ADX111) to a panel that has been primed with a powder epoxy primer. Initial adhesion was good, but after exposure to boiling water, delamination of the coating occurred in the checkerboard / reverse impact test.

[0140] Thus, as shown in Examples 1-3, the grafted The resin significantly improves the adhesion of KYNAR-acrylic powder coatings.

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Abstract

The invention relates to a coating composition comprising a radiation grafted functionalized fluoropolymer. This coating is preferably, in the form of a powder coating. The coating can be used on inorganic substrates, especially un-primed metals. The invention also relates to the coated inorganic substrate and to the use of the coating composition to protect the inorganic substrate, especially from corrosion.

Description

technical field [0001] The present invention relates to a coating composition comprising a radiation-grafted functionalized fluoropolymer. The coating is preferably in the form of a powder coating. The coating can be used on inorganic substrates, especially unprimed metals. The invention also relates to coated inorganic substrates and the use of the coating composition for protecting inorganic substrates, in particular against corrosion. Background technique [0002] Fluoropolymers, especially poly(vinylidene fluoride) (PVDF), are used in applications requiring high heat resistance, high chemical resistance, and good barrier properties to liquids and gases. Therefore, they are very suitable for protecting substrates. Furthermore, they combine excellent resistance to aging, especially UV radiation, and very good abrasion resistance, allowing them to retain their protective properties for a long time. [0003] However, fluoropolymers are known to have problems adhering to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/12C09D133/00
CPCC09D127/16C08L33/06C08L27/16C08F14/18C08L51/003C09D151/06C08L33/04Y10T428/254C08F2/00C08L2666/24C08L2666/02
Inventor 安东尼·邦尼特迈克尔·沃思沃尔特·科萨斯科特·加博里奥费利·鲁索
Owner ARKEMA FRANCE SA