Matched coating for aluminium alloy base material

An aluminum alloy and coating technology, applied in epoxy resin coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor adhesion between coatings and aluminum alloy substrates, and the coatings cannot be solved, and achieves both flexibility and flexibility. Overcome poor adhesion and easy sanding

Active Publication Date: 2006-07-19
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this anti-corrosion effect is limited to the physical shielding effect of aluminum powder. The adhesion between the bottom layer and the aluminum alloy substrate still depends on the adhesion ability of the existing ordinary H04-1 epoxy enamel, and no special attention is paid to the bottom layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Polyester resin for coating and polyester resin for topcoat in the preparation of embodiment 1

[0042] 1. See Table 1 for the formula

[0043] components

name

raw material name

Dosage

Polyester resin for medium paint

Polyester resin for topcoat

join in

quantity

Percentage, %

join in

quantity

Percentage, %

binary

sour

Adipic acid

25.5

25.5

/

34.5

Phthalic anhydride

/

34.5

three yuan

sour

trimellitic acid

11.5

11.5

/

/

binary

Alcohol

Ethylene glycol

14.5

14.5

/

11.5

Neopentyl glycol

/

11.5

three yuan

Alcohol

Trimethylolpropane

18.5

18.5

16.5

16.5

Quaternary

Alcohol

pentaerythritol

/

/

10.5

10...

Embodiment 2

[0046] Embodiment 2 prepares primer B component

[0047] 1. See Table 2 for the formula

[0048]

component name

raw material name

Dosage

Amount added

Percentage, %

polyamine

triethylenetetramine

12.5

12.5

liquid epoxy

fat

618

27.5

27.5

Thinner

Xylene

24.0

60.0

Butanol

18.0

Ethylene glycol monomethyl ether

18.0

[0049] 2. Operation method

[0050] In the reaction bottle equipped with stirring, heating system, reflux condenser, high level tank and thermometer, according to the formula amount listed in Table 2, add polyamine and half the amount of diluent, liquid epoxy resin and the other half in the reaction bottle A certain amount of diluent, mixed evenly, added to the high-level tank, heated to 60°C while stirring, began to drop the epoxy resin liquid in the high-level tank, and the dropwise addition was completed w...

Embodiment 3

[0051] The second component of paint in the preparation of embodiment 3

[0052] 1. See Table 3 for the formula

[0053]

component name

raw material name

Dosage

Amount added

Percentage, %

polyether

N-210

29.5

29.5

Triols

Trimethylolpropane

7.0

7.0

Diisocyanate

TDI (2, 4 bodies)

27.5

27.5

catalyst

Butyl phosphate

0.1

0.1

Thinner

Xylene

22.9

35.9

Butanol

13.0

[0054] Note: N-210 in the table is a grade of polyether, the chemical name is dihydroxypolyoxypropylene ether, and the molecular weight is 1000±10.

[0055] 2. Operation method

[0056] In the reaction flask equipped with stirring, heating system, reflux condenser and thermometer, add polyether, trihydric alcohol, xylene and 60% catalyst according to the formula, heat while stirring, and raise the temperature to 140 within 2 to 3 ho...

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PUM

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Abstract

The matched coating for aluminum alloy base material special to corrosion protection and decoration comprises: the primer with epoxy-amine addition system as double constituents, the middle painting as polyester/polyurethane system used polyester resin with acid number of as 8-10 and alternative soft and hard chain segments, and the top coat used polyester resin with acid number not more than 6 and main chain as hard segment and chain length and branching degree both more than the middle. Wherein, the polyamine on primer reacts with the epoxy resin to produce the secondary amine with more slow activity and enhance the adhesive force. This invention solves the aluminum alloy adhesion problem without smoke resistant material, and comes up to the first-level security standard.

Description

technical field [0001] The invention relates to a matching coating for aluminum alloy substrates, which is especially suitable for anticorrosion and decoration of various aluminum alloy train bodies. Background technique [0002] At present, domestic rail trains are speeding up in an all-round way. In order to reduce the weight of the car body, the train body is transitioning from a steel structure substrate to an aluminum alloy substrate. However, under natural conditions, the aluminum alloy reacts with oxygen in the air to easily form an oxide film, and this oxide film has a relatively high density, thus causing many existing coatings to fail to achieve good adhesion on the surface. The current means to solve this problem is to chemically treat the aluminum alloy surface, or to modify the coating itself so that it can achieve good adhesion on the difficult-to-adhesive aluminum alloy substrate, or to combine these methods. For example, U.S. Patent 6458898B1 introduces a tw...

Claims

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Application Information

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IPC IPC(8): C09D163/02C09D175/06B05D7/14B05D1/36
Inventor 王留方朱亚君倪爱兵张睿赵宝华
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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