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Preparation method of water-based self-extinction spray resin

A self-dulling, resin-based technology, applied in coatings, polyurea/polyurethane coatings, etc., can solve problems such as low gloss, high haze, and high cost, and achieve uniform and fine coating surface, simple and controllable process, and good extinction effect Effect

Active Publication Date: 2014-07-23
ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Matting powder is cheap, but it will be incompatible with water-based emulsions, or even if it is temporarily compatible, it will settle for a long time
At the same time, matting wax additives are expensive, and if the film is applied by roller coating, the wax will precipitate and stick to the roller, thereby reducing the service life of the roller
In addition, the method of adding a matting agent to achieve the purpose of matting requires adding a large amount of matting agent to achieve the effect of high haze and low gloss, which not only costs a lot, but also has other uncontrollable effects on the coating film. various defects of

Method used

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  • Preparation method of water-based self-extinction spray resin
  • Preparation method of water-based self-extinction spray resin
  • Preparation method of water-based self-extinction spray resin

Examples

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preparation example Construction

[0030] Such as figure 1 , figure 2 Shown, the present invention discloses a kind of preparation method of water-based self-dulling atomized resin, and it comprises the steps:

[0031] S1. Synthesizing polyurethane prepolymer; adding 90 to 120 parts of polyether diol and 2 to 20 parts of carboxylic acid type hydrophilic diol to the reactor in parts by weight, dehydrating and cooling under heating conditions; Continue to add 0.1-1.0 parts of catalyst and 100-250 parts of diisocyanate into the reactor for reaction until the isocyanate in the system reaches the theoretical value. Among them, the carboxylic acid type hydrophilic diol is preferably 4 to 10 parts.

[0032] S2. Pre-chain extension: In parts by weight, continue to add 7 to 20 parts of the first small molecule chain extender to the reactor for chain extension reaction.

[0033] S3. Post-chain extension: in parts by weight, add 800-1200 parts of an aqueous solution in which 5-35 wt % of an emulsifier is dissolved und...

Embodiment 1

[0048] 30g of polyethylene glycol with a molecular weight of 300 and 2g of bismethylolpropionic acid were vacuum dehydrated in a reactor at 120°C for 2 hours, and the temperature was lowered to 60°C.

[0049] Add 0.1g of di-n-butyltin dilaurate to the above reaction kettle, raise the temperature to 80°C, add 66.6g of isophorone diisocyanate dropwise into the above reaction kettle within 2 hours, continue the reaction for 1 hour, then cool down to 60°C ℃.

[0050] Add 4.14g of 1,4-butanediol and 4.14g of trimethylolpropane into the reactor, and react for 1h.

[0051] Under the state of stirring at 1500r / min, add an emulsifier formed by dissolving 10g of polypropylene alcohol and 5g of Span-80 in 300g of water into the reaction kettle, stir for 10min, and add 10g of water containing 1g of diethylenetriamine.

[0052] Reduce the stirring speed to 500r / min, add 1.51g of triethylamine into the stirred tank, continue to stir for 10min, cool down to room temperature, and filter out ...

Embodiment 2

[0054] 40 g of polyethylene glycol with a molecular weight of 400 and 2 g of bismethylolpropionic acid were vacuum dehydrated at 120°C for 2 hours in a reaction kettle, and the temperature was lowered to 60°C.

[0055] Add 0.1g of di-n-butyltin dilaurate to the above reaction kettle, raise the temperature to 80°C, add 54g of hexamethylene diisocyanate dropwise into the above reaction kettle within 2 hours, continue the reaction for 1 hour, then cool down to 60°C .

[0056] Add 4.81g of 1,4-butanediol and 4.81g of trimethylolpropane into the reactor, and react for 1h.

[0057] Under the state of stirring at 1500r / min, an emulsifier formed by dissolving 9g of polypropylene alcohol and 7g of Tween-80 in 310g of water was added to the reaction kettle, stirred for 15min, and 10g of water containing 1g of trimethylolpropane was added.

[0058] Reduce the stirring speed to 500r / min, add 1.51g of triethylamine into the stirred tank, continue to stir for 15min, cool down to room tempe...

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Abstract

The invention discloses a preparation method of a water-based self-extinction spray resin, which comprises the following steps: S1. synthesis of polyurethane prepolymer; adding polyether dibasic alcohol and carboxylic-acid hydrophilic dibasic alcohol into a reactor according to parts by weight, heating to dehydrate, and cooling; adding a catalyst and diisocyanate into the reactor to react; S2. primary chain extension: continuing adding a first micromolecule chain extender into the reactor according to parts by weight to perform chain extension reaction; S3. secondary chain extension: adding an emulsifier-containing water solution according to parts by weight while stirring, and adding a second micromolecule chain extender while continuing stirring; and S4. neutralization: adding tertiary amine into the reactor, stirring and discharging. The preparation method is simple and controllable in technique and easy to operate, can obtain favorable extinction effect without adding any extinction powder or extinction wax; and the surface of the coated film is uniform, fine and smooth.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a preparation method of water-based self-dulling atomized resin. Background technique [0002] Matting resin generally refers to a resin with high haze and low gloss (matte) after film formation, which is mainly used in coatings. Existing matting technologies are mainly divided into self-matting and externally adding matting agents. [0003] Among them, the self-dulling resin refers to a kind of resin that does not need to add matting powder or matting wax to the resin, so that the resin can have higher haze and lower gloss after film formation. The principle of self-dulling resin is to make the surface of the resin coating film appear uneven, so that the light produces diffuse reflection; or use two incompatible or partially compatible resins to mix or modify, and use their refraction of light to produce Different states show the atomization effect of the coating film to achi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/73C08G18/66C08G18/48C08G18/12
CPCC08G18/0823C08G18/12C08G18/3206C08G18/6692C08G18/73C08G18/755C08G18/8016C08G18/8048C09D175/08
Inventor 许迁
Owner ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL
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