Polyester back coating and preparation method thereof

A technology of back paint and polyester, which is applied in the direction of polyester paint, coating, etc., can solve the problems of low solid content, poor flexibility, anti-sticking of color plate top paint and back paint, etc., and achieve excellent composite performance and compression resistance Excellent, excellent adhesion effect

Inactive Publication Date: 2016-05-25
NIPPON PAINT TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Commonly used coil back paints mainly include epoxy back paint, polyester back paint and polyester modified epoxy back paint. The epoxy back paint has high hardness, which can reach 5-6H, and has excellent adhesion and pressure resistance. The disadvantages are Low solid content, high paint consumption, high price, poor flexibility, about 6T; polyester back paint has high solid content, low paint consumption, relatively cheap price, good flexibility, about 4T, but the hardness can only reach 4H , the adhesion and pressure resistance are relatively poor; the performance of polyester modified epoxy back paint is between the first two
The color coating line is used for color plate coating. After the color plate is rolled, the weight of the roll is 2-10 tons. During the transportation, the color roll will be piled up in 1-2 layers, which will generate a force of relative displacement, resulting in the color plate topcoat and The back paint is sticky, indented, or even peeled off

Method used

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  • Polyester back coating and preparation method thereof
  • Polyester back coating and preparation method thereof
  • Polyester back coating and preparation method thereof

Examples

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preparation example Construction

[0055] In the preparation method of the present invention, polyester resin and dispersant (selectively added) are added earlier, and then the pigment is added. At this time, the viscosity of the system is higher, and the polyester resin can be fully combined with the pigment, and the pigment can be well wetted. Give full play to the effect of dispersant, after pre-mixing, add appropriate solvent to adjust to the optimum viscosity for sanding, which is convenient for sanding and improves production efficiency and yield.

[0056] Since the compatibility between the additive and the main resin (polyester resin, amino resin) is not very good, if the main resin is less, it may become turbid and crystals will be precipitated, which will affect the effect of the topcoat. Therefore, the performance of the polyester back paint obtained when the polyester resin and amino resin are added first (in no particular order), and then other additives (in no particular order) is added.

Embodiment 1

[0070] A preparation method of polyester back paint, comprising the following steps:

[0071] 1) Polyester resin PRS-100133.6 parts, dispersant EFKA40101 parts, pigment titanium dioxide R-99636.49 parts, pigment carbon black MITSUBISHICARBONBLACKMA-1000.01 parts, pigment iron oxide red BAYFERROX41200.1 parts, pigment iron oxide yellow BAYFERROX49051 parts, anti-settling Agent CAB-O-SILM-50.3 parts, solvent trimethylbenzene solvent oil (S-100 solvent oil) 3 parts, ethylene glycol butyl ether 3 parts and isobutanol 4 parts are mixed and ground, and the grinding fineness is below 10 μm. The grinding temperature is 40°C, and the grinding time is 2 hours; the slurry is obtained;

[0072] 2) Add 38 parts of amino resin CYMEL3038 parts, xylene formaldehyde resin S-912Varnish 2 parts, acid catalyst NACURE10510.4 parts, adhesion promoter ADP2 parts, wax additive SYNFLUO178VF0.1 part, leveling agent LEVELERT (NPZ) 1 part, 0.3 parts of defoamer LEVELERC (NPZ), 1 part of matting agent SY...

Embodiment 2

[0081] A preparation method of polyester back paint, comprising the following steps:

[0082] 1) Polyester resin PRS-100148 parts, dispersant EFKA40103 parts, pigment titanium dioxide R-99625.1 parts, pigment carbon black MITSUBISHICARBONBLACKMA-1000.4 parts, pigment iron oxide red BAYFERROX41200.2 parts, pigment iron oxide yellow BAYFERROX49051.2 parts, Anti-sedimentation agent CAB-O-SILM-50.1 parts and solvent trimethylbenzene solvent oil (S-100 solvent oil) 3 parts, ethylene glycol butyl ether 3 parts and isobutanol 4 parts are mixed and ground, and the grinding fineness is 10 μm Below, the grinding temperature is 50°C, and the grinding time is 2 hours; the slurry is obtained;

[0083] 2) Add amino resin CYMEL3034.9 parts, xylene formaldehyde resin S-912Varnish1 part and acid catalyst NACURE10510.8 parts, adhesion promoter ADP2 parts, wax additive SYNFLUO178VF0.2 parts, leveling agent LEVELERT ( NPZ) 0.3 parts, defoamer LEVELERC (NPZ) 1 part, matting agent SYLOIDC8070.5 pa...

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Abstract

The invention discloses a polyester back coating, made mainly from the components of following parts by weight: 30-60 parts of polyester resin, 15-40 parts of 15-40 parts, 3.5-10 parts of amino resin, 0.8-3 parts of xylene formaldehyde resin, 1.8-13 parts of aid and 7-17 parts of solvent. The invention also discloses a preparation method of the polyester back coating. Volatile organic matters in the polyester back coating provided by the invention are less than 420 g/l; it is possible for the coating to quickly solidify at PMT (peak metal temperature) 204-232 DEG C; the hardness is up to 6H, compressive strength is excellent, and reverse bonding of the back coating with finish coat is avoided; T-bend performance reaches 4T without peeling, flexibility is good, adhesion is excellent, and peeling-off of the coating is avoided in the processing process; the coating is resistant to more than butanone wipes; the coating can well combine with a foam plate.

Description

technical field [0001] The invention belongs to the technical field of paint and its preparation, in particular to a polyester back paint and its preparation method. Background technique [0002] Coil coatings include coil steel coatings and coil aluminum coatings. The coatings are applied to the surface of steel plates and aluminum materials by roller coating, and then made into pre-coated coils (color-coated plates), which have beautiful appearance and bright colors. , high strength, good melting resistance, convenient processing and molding, etc., enable users to reduce costs and reduce pollution, so it has been widely used. [0003] Coil coating generally adopts the two-coating and two-baking process of primer and topcoat. The primer and topcoat are applied on the front. The primer provides adhesion and corrosion resistance. Scratch resistance, constructability and processing formability; the back paint is mainly used for protection, and at the same time provides appear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D161/20C09D7/12
CPCC09D167/00C08L2205/035C09D7/61C09D7/63
Inventor 靳正荣
Owner NIPPON PAINT TIANJIN
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