A kind of hydrophobic flame-retardant water-based curing agent and preparation method thereof

A water-based curing agent, flame-retardant technology, applied in the field of hydrophobic flame-retardant water-based curing agent and its preparation, can solve the problems of short pot life, poor aging resistance, high surface tension of water-based curing agent, etc., and achieve good storage stability , good corrosion resistance, excellent hydrophobic effect

Active Publication Date: 2020-10-27
UNION FOSHAN CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN102911342A discloses a fluorine-containing water-based polyurethane curing agent and its preparation method, including: 100 parts by mass of isocyanate or its derivatives, 10-25 parts of fluoropolymer, and 5-20 parts of compounds containing hydrophilic groups , 50-120 parts of solvent, 0.02-0.05 parts of catalyst, 0-3.9 parts of neutralizing agent; however, the fluorine atoms are added in the form of fluorine-containing polymer diols, and the fluorine atoms are easily wrapped in molecular chains, affecting its hydrophobicity performance, and no flame retardant performance, high VOC
[0006] Chinese patent CN102050935A discloses a water-based polyurethane curing agent and a preparation method thereof, which includes toluene diisocyanate, trimethylolpropane, polyethylene glycol, polycarbonate diol, ethyl acetate and a catalyst; its preparation steps are: Add 18-25% toluene diisocyanate, 20.01-80% ethyl acetate and 0.01-40% polycarbonate diol, put 1-5% trimethylolpropane into the reaction in three batches, and then add 0.01-40% polycarbonate Ethylene glycol is put into the reaction in two batches, kept at 58-63°C for 3 hours, added 0.1-0.5% catalyst, kept at 50-60°C for 2.5-4 hours, cooled to 20-30°C, and then released material; the toluene diisocyanate used in it is prone to yellowing and has poor aging resistance
[0007] Chinese patent CN103030969A discloses a nano water-based polyurethane curing agent and its preparation method, which consists of polyisocyanate, polyether polyol, phosphoric acid, nano powder, xylene, cyclohexanone, N,N-dimethylformamide or tetrahydrofuran It is formed by reacting with DBTDL; the water-based curing agent made by it has high surface tension, low hydrophobicity and oil repellency, and has no flame retardancy
[0008] At present, the most commonly used is water-based polyurethane curing agent, but it has low stability, short pot life, poor hydrophobicity, and no flame retardant performance.

Method used

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  • A kind of hydrophobic flame-retardant water-based curing agent and preparation method thereof
  • A kind of hydrophobic flame-retardant water-based curing agent and preparation method thereof
  • A kind of hydrophobic flame-retardant water-based curing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kind of hydrophobic flame-retardant water-based curing agent, its preparation steps are as follows:

[0031] a), pre-dehydrating and drying oligomer polyols and solvents;

[0032] b), feed nitrogen into the reactor equipped with a thermometer, condenser, and stirrer to remove the air in the reactor, add 3.0 parts of dimethylol propionic acid, 8.0 parts of polytetrahydrofuran polyol, dilauric acid dilaurate 0.05 parts of butyl tin, 15.0 parts of hydroxyl-containing melamine derivatives, 9.85 parts of propylene glycol ethyl ether acetate, stir evenly and heat up to 60-70°C;

[0033] c), Slowly add 58.0 parts of hexamethylene diisocyanate dropwise, control the dropping time to 0.5~1h, then raise the temperature to 84~88°C and keep it warm for 2.0~3.0h, cool down to 70~75°C, add hexafluoroisocyanate 3.8 parts of propanol, keep the constant temperature reaction for 1.5~2.5h, start to detect the NCO value, stop the reaction when the detected NCO value is consistent with th...

Embodiment 2

[0035] A kind of hydrophobic flame-retardant water-based curing agent, its preparation steps are as follows:

[0036] a), pre-dehydrating and drying oligomer polyols and solvents;

[0037] b), feed nitrogen into the reactor equipped with a thermometer, condenser, and agitator to remove the air in the reactor, add 4.5 parts of dimethylol propionic acid, 6.0 parts of polyether glycol, dilauric acid 0.05 parts of dibutyltin, 15.5 parts of hydroxy-containing melamine derivatives, 13.05 parts of propylene glycol methyl ether acetate, stir evenly and heat up to 60-70°C;

[0038] c), Slowly add 55.0 parts of hexamethylene diisocyanate dropwise, control the dropping time to 0.5~1h, then raise the temperature to 84~88°C and keep it warm for 2.0~3.0h, cool down to 70~75°C, add hexafluoroisocyanate 2.5 parts of propanol, keep the constant temperature reaction for 1.5~2.5h, start to detect the NCO value, stop the reaction when the detected NCO value is consistent with the design value; l...

Embodiment 3

[0040] A kind of hydrophobic flame-retardant water-based curing agent, its preparation steps are as follows:

[0041] a), pre-dehydrating and drying oligomer polyols and solvents;

[0042]b), feed nitrogen into the reactor equipped with a thermometer, condenser, and stirrer to remove the air in the reactor, add 4.0 parts of dimethylolpropionic acid, 8.0 parts of polyethylene glycol, dilauric acid dilaurate according to the formula 0.05 parts of butyl tin, 16.5 parts of hydroxyl-containing melamine derivatives, 11.95 parts of propylene glycol ethyl ether acetate, stir evenly and heat up to 60-70°C;

[0043] c), Slowly add 52.0 parts of hexamethylene diisocyanate dropwise, control the dropping time to 0.5~1h, then raise the temperature to 84~88°C and keep it warm for 2.0~3.0h, cool down to 70~75°C, add hexafluoroisocyanate 4.5 parts of propanol, keep the constant temperature reaction for 1.5~2.5h, start to detect the NCO value, stop the reaction when the detected NCO value is c...

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Abstract

The invention relates to a hydrophobic flame-retardant water-based curing agent. The curing agent is obtained by performing a reaction on hexamethylene diisocyanate, a hydrophilic monomer, an oligomerpolyol, a hydroxyl-containing melamine derivative, hexafluoroisopropanol and a solvent under the action of a catalyst and performing neutralization. The invention also provides a preparation method of the hydrophobic flame-retardant water-based curing agent. The prepared hydrophobic flame-retardant water-based curing agent provided by the invention does not contain an aromatic hydrocarbon solvent, and has the characteristics of a long active period, good storage stability and the like; and polyurethane paint prepared from the curing agent and hydroxyl-containing water-based resin has excellent hydrophobicity, scratch resistance, stain resistance, aging resistance, corrosion resistance and good flame retardance; and the curing agent is widely used in two-component systems such as water-based wood paint, water-based industrial paint and water-based plastic paint.

Description

technical field [0001] The invention relates to a water-based curing agent, in particular to a hydrophobic and flame-retardant water-based curing agent and a preparation method thereof, belonging to the technical field of water-based curing agents. Background technique [0002] Curing agent is a kind of substance or mixture that promotes or controls the curing reaction. In the existing oil and water-based paints, in order to speed up the curing speed of the paint and improve the various properties of the paint film, it is also necessary to add a curing agent to the paint. As an important component of coatings, curing agent is an important factor in determining the performance of coatings. It directly determines the dryness, physical and mechanical properties, decorative properties, medium resistance, durability and weather resistance of the coating. Therefore, the technology and product quality level of curing agent represent the industrial level of coatings. [0003] With...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/73C08G18/66C08G18/48C08G18/38C08G18/34
CPCC08G18/348C08G18/3802C08G18/3851C08G18/4825C08G18/4833C08G18/4854C08G18/6692C08G18/73
Inventor 张武许钧强康伦国姚东生
Owner UNION FOSHAN CHEM
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