Aqueous primer used for bicycles

Abstract

The invention relates to an aqueous primer used for bicycles, which comprises the following components in percentage by weight: 25-45% of aqueous epoxy acrylate resin, 2-10% of curing agent resin, 1-3% of neutralizing agent dimethylethanolamine, 2-10% of compound anticorrosive pigment, 5-20% of tinting pigment and filler, 0.1-0.5% of antifoaming agent, 0.1-0.5% of flatting agent and 20-40% of deionized water, wherein the sum of the content of all components is 100%. The aqueous epoxy acrylate resin accounts for 10-40% of the total mass of epoxy resin; the curing agent resin comprises aqueous closed-type polyurethane curing agent resin and amino curing agent resin, wherein the mass ratio of the aqueous closed-type polyurethane curing agent resin to the amino curing agent resin is 1:5-5:1; the aqueous closed-type polyurethane curing agent resin is decapsulated and solidified at the temperature of 130DEG C; the amino curing agent resin is carbinol or butylated amino melamine formaldehyderesin; and the compound anticorrosive pigment comprises modified zinc phosphate, zinc oxide and ion exchange type anticorrosive pigment. The aqueous primer disclosed by the invention is especially suitable for preventing rust and corrosion of structures, such as bicycles and the like.

Description

technical field

[0001] The invention relates to a water-based primer for bicycles, which is especially suitable for antirust and anticorrosion of structures such as bicycles. Background technique

[0002] The painting of bicycles is similar to the painting of other traffic vehicles, generally using a primer, primer and topcoat system. At present, solvent-based systems are widely used in the bicycle industry in China, and a large amount of organic volatile compounds are emitted, which not only damages the environment, endangers people's health, but also wastes resources and energy. In this situation, in order to respond to the development direction of national industrial policies, bicycle manufacturers require the development of water-based paint systems for bicycles to replace solvent-based paints. However, the existing bicycle coating process is different from that of general traffic vehicles. It is required that the coating film be completely cured and dried at 135±3°C fo...

Examples

Embodiment 1

[0015] Embodiment 1 prepares waterborne epoxy acrylic resin

[0016] The water-based epoxy acrylic resin is made of epoxy resin with an epoxy equivalent of 500-1500g / mol, which accounts for 10-40% of the total weight of the resin, and is heated and dissolved with a solvent and partially aminated, and then mixed with acrylic acid, hydroxypropyl acrylate, Acrylic resin with an acid value of 50-200mgKOH / g, which is formed by free radical polymerization of butyl acrylate and styrene monomer, is prepared by heating together for catalytic esterification reaction. The specific operation is as follows:

[0017] ① Preparation of acrylic resin

[0018] Add 244 parts by weight of ethylene glycol butyl ether and 90 parts by weight of propylene glycol methyl ether into a 1000ml four-neck flask equipped with a thermometer, a stirring device and a condensation device, start stirring and heat up to a reaction temperature of 115°C, and 92.7 parts by weight of acrylic acid hydroxyl Propyl este...

Embodiment 2

[0021] Embodiment 2 prepares water-based closed type polyurethane curing agent resin A and B

[0022] (1) The specific formula is shown in Table 1.

[0023] Table 1

[0024]

[0025] Note: N75 is 1,6-hexamethylene diisocyanate biuret produced by Bayer; N3390 is 1,6-hexamethylene diisocyanate trimer produced by Bayer.

[0026] (2) specific preparation method

[0027] According to the formula in Table 1, add polyisocyanate and co-solvent to the reaction vessel and adjust the temperature to 50°C, then add the blocking agent 3,5-dimethylpyrazole, keep the reaction for 2 hours, then raise the temperature to 60-80°C, Add the hydrophilic component dimethylolpropionic acid, keep it warm for 4 hours, then cool down to 50°C, add neutralizing agent dimethylolamine to neutralize, then dilute with deionized water to a solid content of 40% by weight, filter, Packaging respectively made water-based blocked polyurethane curing agent resins A and B, wherein the isocyanate group content o...

Embodiment 3

[0028] Embodiment 3 prepares bicycle water-based primer

[0029] (1) The formula water-based primer for bicycles is composed of the following components, in percentage by weight, and the dosage of each component is as follows:

[0030] Water-based epoxy acrylic resin 25-45, curing agent resin 2-10, neutralizer dimethylethanolamine 1-3, composite anti-rust pigment 2-10, coloring pigment and filler 5-20, defoamer 0.1-0.5, Leveling agent 0.1-0.5, deionized water 20-40, the sum of the contents of each component is 100%, the specific formula is shown in Table 2.

[0031] Table 2

[0032]

[0033]

[0034] Note: R717 is an amino resin product of INEOS;

[0035] BYK025 is a defoamer product of BYK Chemicals;

[0036] BYK331 is the leveling agent product of BYK Chemical Company;

[0037] Titanium dioxide 902 is DuPont's rutile titanium dioxide product;

[0038] PU carbon black is a carbon black product of Degussa;

[0039] ZMP is a modified zinc phosphate anti-rust pigment...

technical field

[0001] The invention relates to a water-based primer for bicycles, which is especially suitable for antirust and anticorrosion of structures such as bicycles. Background technique

[0002] The painting of bicycles is similar to the painting of other traffic vehicles, generally using a primer, primer and topcoat system. At present, solvent-based systems are widely used in the bicycle industry in China, and a large amount of organic volatile compounds are emitted, which not only damages the environment, endangers people's health, but also wastes resources and energy. In this situation, in order to respond to the development direction of national industrial policies, bicycle manufacturers require the development of water-based paint systems for bicycles to replace solvent-based paints. However, the existing bicycle coating process is different from that of general traffic vehicles. It is required that the coating film be completely cured and dried at 135±3°C fo...

Examples

Embodiment 1

[0015] Embodiment 1 prepares waterborne epoxy acrylic resin

[0016] The water-based epoxy acrylic resin is made of epoxy resin with an epoxy equivalent of 500-1500g / mol, which accounts for 10-40% of the total weight of the resin, and is heated and dissolved with a solvent and partially aminated, and then mixed with acrylic acid, hydroxypropyl acrylate, Acrylic resin with an acid value of 50-200mgKOH / g, which is formed by free radical polymerization of butyl acrylate and styrene monomer, is prepared by heating together for catalytic esterification reaction. The specific operation is as follows:

[0017] ① Preparation of acrylic resin

[0018] Add 244 parts by weight of ethylene glycol butyl ether and 90 parts by weight of propylene glycol methyl ether into a 1000ml four-neck flask equipped with a thermometer, a stirring device and a condensation device, start stirring and heat up to a reaction temperature of 115°C, and 92.7 parts by weight of acrylic acid hydroxyl Propyl este...

Embodiment 2

[0021] Embodiment 2 prepares water-based closed type polyurethane curing agent resin A and B

[0022] (1) The specific formula is shown in Table 1.

[0023] Table 1

[0024]

[0025] Note: N75 is 1,6-hexamethylene diisocyanate biuret produced by Bayer; N3390 is 1,6-hexamethylene diisocyanate trimer produced by Bayer.

[0026] (2) specific preparation method

[0027] According to the formula in Table 1, add polyisocyanate and co-solvent to the reaction vessel and adjust the temperature to 50°C, then add the blocking agent 3,5-dimethylpyrazole, keep the reaction for 2 hours, then raise the temperature to 60-80°C, Add the hydrophilic component dimethylolpropionic acid, keep it warm for 4 hours, then cool down to 50°C, add neutralizing agent dimethylolamine to neutralize, then dilute with deionized water to a solid content of 40% by weight, filter, Packaging respectively made water-based blocked polyurethane curing agent resins A and B, wherein the isocyanate group content o...

Embodiment 3

[0028] Embodiment 3 prepares bicycle water-based primer

[0029] (1) The formula water-based primer for bicycles is composed of the following components, in percentage by weight, and the dosage of each component is as follows:

[0030] Water-based epoxy acrylic resin 25-45, curing agent resin 2-10, neutralizer dimethylethanolamine 1-3, composite anti-rust pigment 2-10, coloring pigment and filler 5-20, defoamer 0.1-0.5, Leveling agent 0.1-0.5, deionized water 20-40, the sum of the contents of each component is 100%, the specific formula is shown in Table 2.

[0031] Table 2

[0032]

[0033]

[0034] Note: R717 is an amino resin product of INEOS;

[0035] BYK025 is a defoamer product of BYK Chemicals;

[0036] BYK331 is the leveling agent product of BYK Chemical Company;

[0037] Titanium dioxide 902 is DuPont's rutile titanium dioxide product;

[0038] PU carbon black is a carbon black product of Degussa;

[0039] ZMP is a modified zinc phosphate anti-rust pigment...

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