CN-118562382-B - Blade primer

CN118562382BCN 118562382 BCN118562382 BCN 118562382BCN-118562382-B

Abstract

The invention provides a blade primer, which belongs to the field of coating chemical industry and comprises a coating component and a curing agent component, wherein the coating component comprises, by weight, 30% -35% of epoxy modified polyester resin, 20% -30% of anatase titanium dioxide, 10% -15% of ultrafine mica powder, 1% -2% of thixotropic agent, 0.5% -1% of drier, 0.5% -1% of silane coupling agent, 20% -30% of mixed solvent, and the curing agent comprises, by weight, 30% -40% of aliphatic isocyanate curing agent, 30% -40% of aromatic diisocyanate and 20% -35% of butyl acetate. The blade primer disclosed by the invention has the performances of high flexibility, high dielectric resistance and the like, is matched with weather-resistant blade paint for use, and can effectively reduce the overall coating cost of the blade.

Inventors

Zhou rudong
DING BANGYONG
LIU ZHONGYANG
LU WENMING
ZHAO BAOHUA
LI WENKAI

Assignees

中海油常州涂料化工研究院有限公司
中海油能源发展股份有限公司
中海油常州环保涂料有限公司

Dates

Publication Date: 20260512
Application Date: 20240619

Claims (4)

1. The blade primer consists of a coating component and a curing agent component, and is characterized in that the coating component comprises, by weight, 30-35% of epoxy modified polyester resin, 20-30% of anatase titanium dioxide, 10-15% of ultrafine mica powder, 1-2% of thixotropic agent, 0.5-1% of drier, 0.5-1% of silane coupling agent and 20-30% of mixed solvent, and the curing agent comprises, by weight, 30-40% of aliphatic isocyanate curing agent, 30-40% of aromatic diisocyanate and 20-35% of butyl acetate; The epoxy modified polyester resin comprises the following raw materials in percentage by weight: 15-25 wt% of neopentyl glycol; 5 to 15 weight percent of 4, 8-tricyclo [5.2.1.0 2,7 ] decanedimethanol; 5-15 wt% of terephthalic acid; 5-15 wt% of isophthalic acid; 10-15 wt% of sebacic acid; 4-10wt% of benzoic acid; 5-15 wt% of E-51 epoxy resin; 0.1 to 0.5 weight percent of organotin catalyst; 25-35 wt% of dimethylbenzene; The solid content of the epoxy modified polyester resin is 65-75wt%, the hydroxyl content is 3.5-4.5wt%, and the acid value is less than or equal to 5mgKOH/g; The preparation of the epoxy modified polyester resin comprises the following steps: Heating benzoic acid and E-51 epoxy resin to 125-135 ℃ in inert atmosphere, stirring after the mixture is melted, continuously heating to 150-160 ℃ for epoxy ring-opening reaction, adding neopentyl glycol, 4, 8-tricyclo [5.2.1.0 2,7 ] decanedimethanol, terephthalic acid, isophthalic acid, sebacic acid, an organotin catalyst and a small amount of dimethylbenzene after the reaction is carried out until the acid value is less than or equal to 5mgKOH/g, heating to 150-160 ℃ in inert atmosphere, stirring after the mixture is melted, continuously heating to 220-240 ℃ for polycondensation reaction, vacuumizing, cooling to 80 ℃, and adding dimethylbenzene for dilution to obtain the epoxy modified polyester resin.
2. The blade primer according to claim 1, wherein the thixotropic agent is one or more of fumed silica, polyamide wax and organobentonite.
3. The blade primer according to claim 1, wherein the aliphatic isocyanate curing agent in the curing agent component is one or more of Desmodur N75, desmodur N3390, desmodur N3300 and Desmodur Z4470.
4. The blade primer according to claim 1, wherein the aromatic diisocyanate curing agent in the curing agent component is Desmodur L75.

Description

Blade primer Technical Field The invention relates to the field of paint chemical industry, in particular to a blade primer. Background Because the gravity and wind pressure are applied during the running process of the wind driven generator, the wind driven generator blades can flex elastically to different degrees, so that the modern large wind driven generator blades are mostly prepared from glass fiber or carbon fiber reinforced epoxy composite materials, have light density and optimal fatigue strength, can meet the requirements of the large wind driven generator on mechanical properties, but the epoxy composite materials are difficult to bear long-term corrosion of high-strength ultraviolet rays, wind, sand, rain and snow, and further protection needs to be carried out by adopting a coating so as to prolong the service life. In order to adapt to the deformation of the blade, the present blade coating mainly uses an elastic polyester and aliphatic isocyanate curing agent matched polyurethane system, and the pigment and filler mainly uses rutile type titanium dioxide, so that the overall cost is higher. Thus, there is a need for a coating that reduces the cost of blade coating without affecting the overall performance after coating. Disclosure of Invention In view of the above, the present invention aims to provide a blade primer which can reduce the coating cost of the blade and does not affect the overall performance after coating. The blade primer is composed of a coating component and a curing agent component, wherein the coating component comprises, by weight, 30% -35% of epoxy modified polyester resin, 20% -30% of anatase titanium dioxide, 10% -15% of ultrafine mica powder, 1% -2% of thixotropic agent, 0.5% -1% of drier, 0.5% -1% of silane coupling agent, 20% -30% of mixed solvent, and the curing agent comprises, by weight, 30% -40% of aliphatic isocyanate curing agent, 30% -40% of aromatic diisocyanate and 20% -35% of butyl acetate. Further, the epoxy modified polyester resin comprises the following raw materials in percentage by weight: 15-25 wt% of neopentyl glycol; 5 to 15 weight percent of 4, 8-tricyclo [5.2.1.0 2,7 ] decanedimethanol; 5-15 wt% of terephthalic acid; 5-15 wt% of isophthalic acid; 10-15 wt% of sebacic acid; 4-10wt% of benzoic acid; 5-15 wt% of E-51 epoxy resin; 0.1 to 0.5 weight percent of organotin catalyst; 25-35 wt% of dimethylbenzene; The solid content of the epoxy modified polyester resin is 65-75wt%, the hydroxyl content is 3.5-4.5wt%, and the acid value is less than or equal to 5mgKOH/g. Further, the preparation of the epoxy modified polyester resin comprises the following steps: Heating benzoic acid and E-51 epoxy resin to 125-135 ℃ in inert atmosphere, stirring after the mixture is melted, continuously heating to 150-160 ℃ for epoxy ring-opening reaction, adding neopentyl glycol, 4, 8-tricyclo [5.2.1.0 2,7 ] decanedimethanol, terephthalic acid, isophthalic acid, sebacic acid, an organotin catalyst and a small amount of dimethylbenzene after the reaction is carried out until the acid value is less than or equal to 5mgKOH/g, heating to 150-160 ℃ in inert atmosphere, stirring after the mixture is melted, continuously heating to 220-240 ℃ for polycondensation reaction, vacuumizing, cooling to 80 ℃, and adding dimethylbenzene for dilution to obtain the epoxy modified polyester resin. Further, the thixotropic agent is one or more of fumed silica, polyamide wax and organic bentonite. Further, the aliphatic isocyanate curing agent in the curing agent component is one or more of Desmodur N75, desmodur N3390, desmodur N3300 or Desmodur Z4470. Further, the aromatic diisocyanate curing agent in the curing agent component is Desmodur L75. Compared with the prior art, the blade primer disclosed by the invention has the following advantages: (1) The invention takes the epoxy modified flexible polyester resin as a main film forming material, is matched with a mixed curing agent composed of aliphatic isocyanate and aromatic diisocyanate, and compensates the insufficient flexibility of the aromatic diisocyanate by improving the flexibility of the polyester resin; (2) The tricyclic structure of 4, 8-tricyclo [ 5.2.1.0 2,7 ] decanedimethanol improves the flexibility of the polyester resin chain segment, and has better alkali resistance and oil resistance compared with flexible polyester prepared by a large amount of long-chain dihydric alcohol; (3) According to the invention, through epoxy modification, the adhesive force of the polyester resin on the glass reinforced epoxy composite material is improved; (4) According to the invention, the silane coupling agent is added to form a coupling structure between the epoxy modified polyester resin and the glass fiber, so that the adhesive force of the primer on the blade is further improved; (5) In the invention, the modified epoxy with polyhydroxy is prepared by ring opening of monofunctional acid and micromolecular epoxy, and then the epoxy mo