Structural adhesive for wind power blades

JGN812 Structural adhesive for wind power blades

In order to meet the market demand for high-performance structural adhesive for wind power blades, the company has specially launched an adhesive with excellent low exothermic peak and sagging resistance; Excellent physical and mechanical properties and excellent fatigue resistance; It has good thixotropy and relatively long operation time, and is easy to be shaped manually. It is suitable for the bonding of large wind power blades, and provides guarantee for the selection of materials and process quality for the structural bonding of wind power blades.

General Feature Performance

GENERAL

FEATURE

Ⅰ Product features

In the process of blade clamping and bonding, the adhesive needs to be quickly scraped and coated on complex and different bonding parts by hand. These bonding parts are either filled with thick adhesive layer, or in the state of slope and elevation. Therefore, it is necessary for the adhesive to have high thixotropy and good molding ability. High thixotropic adhesive has high viscosity at low shear rate and low viscosity at high shear rate, which can ensure that the adhesive has good construction performance, convenient and rapid scraping, and has certain self defoaming performance to ensure better bonding quality.

The two-component epoxy adhesive begins to react slowly until the gel is solidified after mixing the main agent with the curing agent. The period, when the adhesive is mixed to gel, is operational time. The higher the ambient temperature, the thicker the accumulated adhesive layer, and the shorter the operable time. As the process of blade coating is manual, the time of scraping is longer. Therefore, it is necessary to ensure that the adhesive has enough operational time. At the same time, strict control of the adhesive reaction heat release, to avoid premature gelation resulting in a significant reduction in bonding performance.

Ⅱ Scope of application

It is mainly used for wind power blades. Its function is to bond the blade core material with the shell and the upper and lower blade shells, and fill the gap of the shell to form a solid whole blade.

Ⅲ Construction process

Bonding of wind turbine blade Web

1. Bond the web to the windward surface;

2. Connect the windward side with the leeward side to determine the bonding position between the web and the leeward side;

3. Apply glue at the bonding position of the leeward side, and turn the windward side to bond the web to the bonding position.

Ⅳ Packaging and storage

Packed in iron barrels. Component A is 15kg/barrel and component B is 5kg/barrel. The weight ratio is: A: B = 3:1, and the storage period is 12 months.

PERFORMANCE

Ⅴ Performance Hg/T5248-2017 Epoxy Structural Adhesive for Wind Turbine Blades

Item			Performance index
Sag, mm			-40℃23℃/50%RH50℃
23 ℃, Exothermic peak, ℃			≤2.0
23 ℃ operable time, min			≤100
vitrification rotation	Exceeding the initial value, ℃		≥120
Variable temperature	middle point value,℃		≥65
Linear thermal expansion coefficient, ℃ - 1		3.0mm adhesive layer	≥70≤7.0
Volume shrinkage,%			≤4.0
Tensile shear strength	Normal temperature test, MPaImmersion test 1000h, MPaDamp heat test 2000h, MPa	0.5mm adhesive layer3.0mm adhesive layer0.5mm adhesive layer3.0mm adhesive layer0.5mm adhesive layer3.0mm adhesive layer	≥20≥15≥20≥15≥20≥15	≥20≥15≥20≥15≥20≥15	≥15≥12≥15≥12≥15≥12
T peel strength, KN/M		0.5mm adhesive layer3.0mm adhesive layer	≥2.5≥3.5
Creep, mm		0.5mm adhesive layer3.0mm adhesive layer	≤0.12≤0.30
Fatigue performance	Static tensile shear strength, MPa, fatigue endurance limit, MPAm value	1.0mm adhesive layer	≥20≥3.5≥7.0
Bulk tensile properties	Tensile strength, MPAtensile modulus of elasticity, MPA breaking tensile strain,%Critical strain energy release rate, J / m2		≥55≥4.0×10³≥1.3/	≥50≥3.5×10³≥1.8≥0.6	≥30≥2.0×10³≥3.0/