Ultrahigh-hardness transparent two-component aliphatic polyurethane coating and preparation method thereof

Abstract

The invention relates to an ultrahigh-hardness transparent two-component aliphatic polyurethane coating and a preparation method thereof, the ultrahigh-hardness transparent two-component aliphatic polyurethane coating comprises a polyol component and an isocyanate prepolymer, the polyol component comprises the following raw materials by weight: 20-55% of polyester polyol and / or polyether polyol, 40-55% of a first chain extender, 0.2-2% of an organic metal catalyst, and 0.5-3% of an anti-ultraviolet aging agent; 1-4% of an anti-hydrolysis agent; the polyester polyol is one or more of adipic acid polyesters with the hydroxyl value of 100 to 180 mgKOH / g; the polyether polyol is one or more of polypropylene oxide polyether polyol with the hydroxyl value of 100 to 180 mgKOH / g; the isocyanate prepolymer is formed by prepolymerizing a second chain extender and aliphatic isocyanate, and the NCO content of the prepolymer is 15-35%. The coating is prepared from a polyol component and an isocyanate prepolymer through a transparent coating injection molding process, has excellent ultraviolet aging resistance, scratch resistance and light transmittance, and can be widely applied to the surfaces of decorative parts, household appliance shells, furniture parts and the like in the interior and the exterior of an automobile.

Description

technical field

[0001] The invention relates to the field of polyurethane coatings, in particular to an ultra-high hardness transparent two-component aliphatic polyurethane coating and a preparation method thereof. Background technique

[0002] Scratch-resistant, light-resistant and transparent coating materials are required for surfaces such as trim parts, appliance housings and high-end furniture components in the interior of the car as well as in the exterior area. The surface of decorative parts made of materials such as wood, aluminum or carbon fiber is widely treated by spraying. The spraying process is complicated and the process cycle is long. In order to overcome the above defects, KraussMaffei invented the transparent coating injection molding process (CN1723119A, the publication date is January 18, 2006): the processed decorative parts are placed in the mold cavity, and reaction injection molding equipment is used to Inject the polyurethane coating into the surf...

Examples

Embodiment 1

[0021] Preparation of polyol components: In a 5 L open plastic bucket, weigh 1000 g XCP-700 (polyester polyol, hydroxyl value 167 mg KOH / g), 400 g NPG, 400 g BDO, 9 g T-9, 18 g of UV-1130 and 18 g of stabilizer 9000 were stirred at 70 °C for 30 min to obtain the polyol component, ready to use.

[0022] Preparation of isocyanate prepolymer: weigh 250 g MPG and 1000 g IPDI in a 5 L three-neck glass flask, and react at 90°C for 4 h to obtain isocyanate prepolymer, which is ready for use.

Embodiment 2

[0024] Preparation of polyol components: In a 5 L open plastic bucket, weigh 1000 g XCP-700 (polyester polyol, hydroxyl value 167 mgKOH / g), 400 g BDO, 400 g TMP, 9 g T-9, 18 g UV-1130, 18 g stabilizer 9000, and stirred at 70°C for 30 min to obtain the polyol component, which is ready for use.

[0025] Preparation of isocyanate prepolymer: In a 5 L three-neck glass flask, weigh 250 g MPG, 500 g IPDI, and 500 g THDI, and react at 90 °C for 4 h to obtain isocyanate prepolymer, which is ready for use.

Embodiment 3

[0027] Preparation of polyol components: In a 5 L open plastic bucket, weigh 500 g XCP-700 (polyester polyol, hydroxyl value 167 mgKOH / g), 500 g DL-1000 (polyether polyol, hydroxyl value 112 mgKOH / g) g), 400 g CHDM, 400 g TMP, 9 g T-9, 18 g UV-1130, 18 g stabilizer 9000, and stirred at 70 °C for 30 min to obtain the polyol component, which is ready for use.

[0028] Preparation of isocyanate prepolymer: weigh 300 g NPG and 1000 g IPDI in a 5 L three-neck glass flask, and react at 90°C for 4 h to obtain isocyanate prepolymer, which is ready for use.

technical field

[0001] The invention relates to the field of polyurethane coatings, in particular to an ultra-high hardness transparent two-component aliphatic polyurethane coating and a preparation method thereof. Background technique

[0002] Scratch-resistant, light-resistant and transparent coating materials are required for surfaces such as trim parts, appliance housings and high-end furniture components in the interior of the car as well as in the exterior area. The surface of decorative parts made of materials such as wood, aluminum or carbon fiber is widely treated by spraying. The spraying process is complicated and the process cycle is long. In order to overcome the above defects, KraussMaffei invented the transparent coating injection molding process (CN1723119A, the publication date is January 18, 2006): the processed decorative parts are placed in the mold cavity, and reaction injection molding equipment is used to Inject the polyurethane coating into the surf...

Examples

Embodiment 1

[0021] Preparation of polyol components: In a 5 L open plastic bucket, weigh 1000 g XCP-700 (polyester polyol, hydroxyl value 167 mg KOH / g), 400 g NPG, 400 g BDO, 9 g T-9, 18 g of UV-1130 and 18 g of stabilizer 9000 were stirred at 70 °C for 30 min to obtain the polyol component, ready to use.

[0022] Preparation of isocyanate prepolymer: weigh 250 g MPG and 1000 g IPDI in a 5 L three-neck glass flask, and react at 90°C for 4 h to obtain isocyanate prepolymer, which is ready for use.

Embodiment 2

[0024] Preparation of polyol components: In a 5 L open plastic bucket, weigh 1000 g XCP-700 (polyester polyol, hydroxyl value 167 mgKOH / g), 400 g BDO, 400 g TMP, 9 g T-9, 18 g UV-1130, 18 g stabilizer 9000, and stirred at 70°C for 30 min to obtain the polyol component, which is ready for use.

[0025] Preparation of isocyanate prepolymer: In a 5 L three-neck glass flask, weigh 250 g MPG, 500 g IPDI, and 500 g THDI, and react at 90 °C for 4 h to obtain isocyanate prepolymer, which is ready for use.

Embodiment 3

[0027] Preparation of polyol components: In a 5 L open plastic bucket, weigh 500 g XCP-700 (polyester polyol, hydroxyl value 167 mgKOH / g), 500 g DL-1000 (polyether polyol, hydroxyl value 112 mgKOH / g) g), 400 g CHDM, 400 g TMP, 9 g T-9, 18 g UV-1130, 18 g stabilizer 9000, and stirred at 70 °C for 30 min to obtain the polyol component, which is ready for use.

[0028] Preparation of isocyanate prepolymer: weigh 300 g NPG and 1000 g IPDI in a 5 L three-neck glass flask, and react at 90°C for 4 h to obtain isocyanate prepolymer, which is ready for use.

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