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A kind of water-based epoxy primer for pre-coated coils and preparation method thereof

A water-based epoxy and water-based epoxy emulsion technology, applied in the paint field, can solve problems such as poor adhesion and salt spray resistance, difficulty in water-based, and greater impact on physical and mental health

Active Publication Date: 2021-06-15
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common polyester primers are relatively cheap and have good flexibility, but relatively poor adhesion and salt spray resistance; while epoxy primers have strong salt spray resistance, good adhesion, and outstanding comprehensive performance, but are difficult to water-based. Therefore, it is mainly based on organic solvents, which have a greater impact on the environment and people's physical and mental health

Method used

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  • A kind of water-based epoxy primer for pre-coated coils and preparation method thereof
  • A kind of water-based epoxy primer for pre-coated coils and preparation method thereof
  • A kind of water-based epoxy primer for pre-coated coils and preparation method thereof

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preparation example Construction

[0040] The present invention also provides a method for preparing a water-based epoxy primer for precoated coils described in the above technical solution, comprising the following steps:

[0041] Mix water-based epoxy emulsion, pigments and fillers, amino resin, substrate wetting agent, leveling agent, water-based salt spray resistance additive and water to obtain a water-based epoxy primer for pre-coated coils.

[0042] In the preparation method provided by the present invention, the water-based epoxy primer for pre-coated coils can be obtained by directly mixing the raw materials evenly according to the proportion. Wherein, the raw materials include water-based epoxy emulsion, pigments and fillers, amino resins, substrate wetting agents, leveling agents, water-based salt spray resistance additives and water, preferably also include dispersants and / or antirust pigments, the present invention The specific selection and dosage of each raw material have been introduced above, a...

Embodiment 1

[0048] 1) Raw material formula

[0049]

[0050]

[0051] 2) Prepare water-based epoxy primer according to the above-mentioned raw material formula

[0052] Step 1: Mix the water-based epoxy emulsion with dispersant, substrate wetting agent, leveling agent, water-based salt spray resistance additive and water, and stir evenly with a disperser to obtain a mixture;

[0053] Step 2: Add pigments, fillers, anti-rust pigments and amino resins to the above mixture, and use a disperser to disperse evenly, then use a basket sand mill to grind to a fineness of <20μm, and control the grinding temperature to <50°C.

Embodiment 2

[0055] 1) Raw material formula

[0056]

[0057]

[0058] 2) Prepare epoxy primer according to the above raw material formula

[0059] Step 1: Mix the water-based epoxy emulsion with dispersant, substrate wetting agent, leveling agent, water-based salt spray resistance additive and water, and stir evenly with a disperser to obtain a mixture;

[0060] Step 2: Add pigments, fillers, anti-rust pigments and amino resins to the above mixture, and use a disperser to disperse evenly, then use a basket sand mill to grind to a fineness of <20μm, and control the grinding temperature to <50°C.

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Abstract

The invention belongs to the field of paint materials, and in particular relates to a water-based epoxy primer for pre-coated coils and a preparation method thereof. The epoxy primer comprises, in parts by weight: 30-60 parts of water-based epoxy emulsion; pigments and fillers 10-20 parts; 2-6 parts of amino resin; 0.1-0.5 parts of substrate wetting agent; 0-0.5 parts of leveling agent; 1-5 parts of water-based salt spray resistance additive; 10-30 parts of water; amino resin includes Full and / or partially methylated amino resins; substrate wetting agents include one or more of silicone, nonionic, and anionic substrate wetting agents; leveling agents include acrylic leveling agents and / or fluorine modified acrylic leveling agent. In the present invention, by designing a suitable amino group ratio, pigment-base ratio, and selecting suitable additives, the provided epoxy primer can be rapidly cured at a temperature of 200-250°C on a galvanized sheet or a galvanized aluminum sheet, and the formed paint film It has the properties of high hardness, good adhesion, good flexibility, and excellent salt spray resistance time.

Description

technical field [0001] The invention belongs to the field of paint materials, in particular to a water-based epoxy primer for precoated coils and a preparation method thereof. Background technique [0002] Pre-coated coil coatings include coil steel coatings and coil aluminum coatings. It is applied to the surface of steel sheets and aluminum materials by roller coating, and then made into pre-coated coils. Pre-coated coils are light in weight, Excellent performance, low price and widely used, such as automobile manufacturing, ship interior decoration, household appliances, furniture, containers, cooking utensils and other fields have been adopted. [0003] Pre-coated coil coatings generally adopt the two-coating and two-baking process of primer and topcoat. The primer and topcoat are applied to the front. The primer mainly provides adhesion, flexibility and anti-corrosion. The colors mainly include light gray and light yellow; The topcoat has good decoration, protection, d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D5/08C09D7/20C09D7/61C09D7/47
CPCC08K2003/2241C08K2003/327C08K2003/328C09D5/084C09D163/00C09D7/20C09D7/47C09D7/61C08L61/32C08K13/02C08K3/22C08K3/32
Inventor 路建马韵升董双建徐茂利胡耀李玉君崔国栋曾强
Owner CHAMBROAD CHEM IND RES INST CO LTD
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