Low-viscosity solvent-free polyurea coating as well as preparation method and application thereof
A solvent-free, low-viscosity technology, applied in anti-corrosion coatings, coatings, etc., can solve the problem of high VOC emissions, achieve the effects of reducing construction time, improving appearance decoration, and improving anti-corrosion performance
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[0067] The present invention also provides a preparation method of the low-viscosity solvent-free polyurea coating described in the above technical scheme, comprising the following steps:
[0068] Mix polyaspartic acid ester resin, silane resin, pigments and fillers and additives to obtain component A;
[0069] Provide polyisocyanate curing agent to obtain B component.
[0070] The invention mixes polyaspartic acid ester resin, silane resin, pigments and fillers and additives to obtain component A.
[0071] In the present invention, it is preferred to add silane resin, composite anti-rust pigment, pigments and fillers and additives to the polyaspartic acid ester resin under stirring, then grind to a fineness of less than 30 μm, and the temperature reaches 45-65° C. to obtain the A components.
[0072] In the present invention, the viscosity of the component A is preferably 100-120KU.
[0073] The invention provides a polyisocyanate curing agent to obtain the B component.
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Embodiment 1~6
[0085] The low-viscosity solvent-free polyurea coating in embodiment 1~6 among the present invention realizes by following production process:
[0086] Component A: Add polyaspartic acid ester resin, add silane resin, molecular sieve water remover, rheology agent, wetting and dispersing agent, leveling agent, composite antirust pigment and pigment filler during stirring; grind to a fineness of less than 30 μm , the temperature reached 65°C, and kept for 20 minutes; added light stabilizer, UV absorber, and mixed evenly.
[0087] B component: polyisocyanate.
[0088] Before use, mix component A and component B according to the weight ratio shown in Table 1 to prepare the low-viscosity solvent-free polyurea coating of the present invention.
[0089] The compositions, physical parameters and film properties of the low-viscosity solvent-free polyurea coatings provided in Examples 1-6 are shown in Table 1.
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