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Water-dispersed resin and paint for automobile coating

A dispersive, resin-based technology, applied in coatings, polyester coatings, latex paints, etc., can solve the problems of low water resistance, molecular weight limitation, and poor water dispersibility of coating films, and overcome poor water dispersibility and water resistance decline , Excellent impact resistance effect

Inactive Publication Date: 2004-03-10
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of dispersing this resin in water includes: adopting the method of adding an emulsifier, but this will lead to low water resistance of the coating film; it is also possible to make the polyester resin Emulsification in water, however, this emulsification effect is limited, so that the molecular weight of the polyester resin is limited, the molecular weight is too large, the water dispersibility is poor, affecting the storage stability of the coating; the molecular weight is too small, although it can be stably dispersed in water, but the coating Membrane flexibility is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] All the raw materials mentioned above are commercially available. The polyols used can be diols such as neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexyldimethanol, polyether 204, neopentyl glycol monohydroxypivalate, glycidyl tertiary acid Esters, etc., can also be trihydric alcohols such as trimethylolpropane, glycerin, etc., or tetrahydric alcohols such as pentaerythritol; the polyacids used can be dibasic acids such as phthalic anhydride, isophthalic acid, adipic acid, tetrahydro Phthalic anhydride, 1,4-cyclohexyl dicarboxylic acid, etc., may also be tribasic acid such as trimellitic anhydride. These polyhydric alcohols and polybasic acids are suitable for resins A and B. The catalyst can be a common esterification catalyst such as: dibutyltin oxide, lithium hydroxide, etc.

[0013] Resin B shown in Table 1 1 and B 2 In the formula, the amount of ε-caprolactone is controlled at 2 to 20% of the solid weight of the polyester resin, and the resin B 1 3.2%, R...

Embodiment 2

[0023] Step 1 Synthetic Resin A 2 and resin B 2

[0024] Resin A in Table 1 is used instead of the formula 2 and resin B 2 Except that all the other synthetic techniques are the same as in Example 1. The obtained resin A 2 The hydroxyl value is 67, the acid value is 41, the number average molecular weight is 2600, and the solid content is 80%; the obtained resin B 2 The hydroxyl value is 65, the acid value is 3, the number average molecular weight is 4370, and the solid content is 80% for later use.

[0025] Step 2 Resin A 2 and resin B 2 Polycondensation

[0026] Remove Resin A 2 281.4 parts, resin B 2 140.7 parts (resin A 2: Resin B 2 =2:1) ​​to replace the resin A in the second step of Example 1 1 and resin B 1 Except, all the other polycondensation processes are with the second step of embodiment 1. The resulting polycondensate has an acid value of 21, a hydroxyl value of 60, and a number average molecular weight of 4000 for future use.

[0027] The 3rd ste...

Embodiment 4

[0037] Example 4 Preparation of sample

[0038] Test items

Detection method

result

Exterior

Hardness ≥

Stone chip resistance, grade

Flexibility, mm≤

Impact resistance, cm

Moisture and heat resistance, h

Salt spray resistance, h

Adhesion (cross-cut method), grade

visual inspection

GB / T 1730-93B method

VDA-508 stone impact tester

GB / T1731-93

GB / T1732-93

GB / T 1740-79(89)

GB / T1771-91

GB / T9286-88

flat, smooth

0.6

1

1

50

240

500

0

[0039] Note: The stone impact resistance is tested by the VDA-508 stone impact instrument produced by Eriksson Company in Germany.

[0040] Accelerate 1kg of steel shavings (with edges and corners, particle size 4-5mm) for 2 bar compressed air to hit the test

[0041] The sample plate is evaluated according to 0-10 grades (0 grade coating film has no breakdown, 10 grade coating film has a large area

[0042] ...

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PUM

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Abstract

The present invention relates to water dispersed resin and paint for the intermediate coat of vehicle. The resin is water dispersed matter produced through condensation polymerizing hydrophilic polyester resin with acid value of 20-60 and hybrophobic polyester resin with acid value below 5 and obtained via ring-opening polymerization of epsilon-caprolactone in the weight ratio of 1-3 and has acid value of 10-25, hydroxyl value of 50-100 and number average molecular weight of 3000-5000. The paint with the water dispersed resin as filming agent contains water dispersed amino resin and water enclosed polyisocyanate mixed crosslinking agent. The paint has organic volatile matter less than 8 % and can form smooth coat with high adhesive force, good water resistance and flexibility and excellent high shock resistance.

Description

technical field [0001] The invention relates to a water-dispersed resin for coating in automobiles and its coating. Background technique [0002] In automotive painting, in addition to the beautiful appearance of the coating film, the requirements for the durability of the coating film are also getting higher and higher. Therefore, the importance of the middle coat between the primer coat and the top coat is gradually being valued by people, because it can not only buffer the impact of the gravel on the road on the surface of the car, but also protect the primer coat and the substrate. Without damage, the durability of the primer coating film can be greatly improved, and the mid-coat can adjust the flatness of the substrate to form a smooth and meticulous mid-coat surface, which can make the top coat have a better decorative effect. The resin used for coating in automobiles is currently still commonly used in China as solvent-based polyester, which has a high organic solven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/02C09D167/00
Inventor 夏范武董观秀胡中付强严俊
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST