Transparent polyurethane coating composite and preparation method thereof
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A technology of polyurethane coatings and compositions, applied in the direction of polyurea/polyurethane coatings, coatings, etc., which can solve problems that do not involve research on impact resistance, flexibility, and transparent polyurethane two-component coatings
Active Publication Date: 2012-07-25
GUANGDONG INST OF RARE METALS
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The polyurethane polymer has a good high temperature deformation temperature, but its impact resistance, flexibility and other mechanical properties are not involved
[0007] At present, the preparation of high-per
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Embodiment 1
[0027] Synthesis of polyester polyols: according to the formula in Table 1, metered 1,4-cyclohexanedicarboxylic acid, 1,6-hexanediol, 1,4-cyclohexanedimethanol, trimethylolpropane were added to the general In a four-neck flask equipped with a thermometer and a stirrer under nitrogen, raise the temperature to 100-110°C, add catalyst BC-98 and azeotropic solvent xylene into the reaction system, raise the temperature to 140°C, keep it warm for 30min, and then gradually raise the temperature to 210°C ℃, the measured acid value is less than 1.0mgKOH / g, cool down and discharge. The hydroxyl value of the synthesized polyester polyol is 93.8, the acid value is 0.37, the number average molecular weight is 3066, and the molecular weight distribution is 1.25.
Embodiment 2
[0029] Synthesis of polyester polyols: according to the formula in Table 1, metered adipic acid, 1,4-cyclohexanedicarboxylic acid, 1,6-hexanediol, 1,4-cyclohexanedimethanol, trimethylol Add propane to a four-neck flask equipped with a thermometer and a stirrer with nitrogen, raise the temperature to 100-110°C, add catalyst BC-98 and azeotropic solvent xylene into the reaction system, raise the temperature to 140°C, keep it warm for 30min, and then Gradually raise the temperature to 210°C, the measured acid value is less than 1.0mgKOH / g, cool down and discharge. The hydroxyl value of the synthesized polyester polyol is 86.1, the acid value is 0.5, the number average molecular weight is 3127, and the molecular weight distribution is 1.26.
Embodiment 3
[0031] Synthesis of polyester polyol: according to the formula in Table 1, the synthetic method is shown in Example 2. The hydroxyl value of the synthesized polyester polyol is 84.8, the acid value is 0.54, the number average molecular weight is 3384, and the molecular weight distribution is 1.25.
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Abstract
The invention discloses a transparent polyurethane coating composite which is composed of a component A and a component B, wherein the component A is polyester polyol, and the component B is polyisocyanate. The transparent polyurethane coating composite is characterized in that polyester polyol comprises aliphatic and cycloaliphatic diacids with a carbon number of C6-C10; polyester polyol is prepared through carrying out condensation polymerization on one or more of aliphatic and cycloaliphatic dihydric alcohols with a carbon number of C2-C7 and one or more of aliphatic polyatomic alcohols with a carbon number of C2-C7, the molecular weight range of the polyester polyol is 500-5000, and the MWD (molecular weight distribution) of the polyester polyol is 1.1-2.1; the component B is polyisocyanate; and the equivalence ratio of reactive groups of polyisocyanate and polyester polyol is (1.1:1)-(2.5:1). The transparent polyurethane coating composite prepared by the method disclosed by the invention is good in impact property and weather resistance, the light transmittance is greater than or equal to 85.0%, and the impact strength is greater than or equal to 70%, and after the transparent polyurethane coating composite is subjected to QUV ultraviolet accelerated aging for a week, the appearance and light transmittance of a coating are not changed. The coating composite prepared by the method disclosed by the invention can be applied to the fields with higher requirements on the coating performance.
Description
technical field [0001] The invention relates to a polyurethane coating composition and a preparation method thereof, in particular to a transparent two-component polyurethane coating composition and a preparation method thereof. Background technique [0002] Polyurethane (PU) is a polymer with repeating structural units of carbamate chain segments made by the reaction of isocyanate and polyol. It has excellent optical transparency and mechanical properties. The segmented block copolymer is an energy-absorbing elastomer material with high ballistic impact resistance. PU has a variety of excellent characteristics, which has become the key in the development of transparent protective materials, so it is very meaningful to develop high-performance transparent polyurethane materials. [0003] The polyols used to prepare polyurethane include polyester and polyether. Polyester with strong polarity is used as the soft segment to prepare polyurethane with better mechanical propertie...
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