Photocuring hand lay-up resin system for low-temperature environment in winter and preparation method of photocuring hand lay-up resin system

Abstract

The invention belongs to the technical field of hand lay-up resin systems, and particularly relates to a photocuring hand lay-up resin system for a low-temperature environment in winter and a preparation method of the photocuring hand lay-up resin system for the low-temperature environment in winter, and the photocuring hand lay-up resin system for the low-temperature environment in winter comprises 20-50% of an oligomer and 50-80% of a reactive diluent, the preparation method comprises the following steps: adding the oligomer and the reactive diluent into a planetary stirring kettle in proportion, heating and stirring; and after the oligomer is uniformly dispersed in the reactive diluent, adding the photoinitiator, stirring, cooling to room temperature, adding the pigment, the polymerization inhibitor and the defoaming agent, continuously stirring, cooling and filtering, and in extremely cold weather, the photocurable glass fiber adhesive has the characteristics of low viscosity, fast glass fiber infiltration, high reaction activity and the like, and provides convenience for blade maintenance due to the advantage of photocuring. The winter maintenance efficiency of the wind power blade is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hand lay-up resin systems, and in particular relates to a light-curing hand lay-up resin system for low-temperature environments in winter and a preparation method thereof. Background Art

[0002] Blades are the most basic and critical components of wind turbines. Their good design, reliable quality and superior performance are the decisive factors to ensure the normal and stable operation of the unit. With the substantial growth of China's wind power installed capacity, more and more units have been in operation for more than 5 years, and the operation and maintenance of blades are becoming more and more important. The operation and maintenance of blades is a means to prevent passive maintenance of blades and also a way to increase the service life of blades. At present, the commonly used solutions on the market are regular inspections, special weather inspections, and usually use high-power telescopes, drones, hanging baskets, data model analysis, etc. as inspection tools.

[0003] The main material of the blade is glass fiber reinforced epoxy resin, which is a composite material. As the wind turbine runs for a long time, the blades begin to have some defects, such as cracks, bulges, damage, bumps, corrosion or blackening of the lightning arrester, abnormal noise, cracking, and even breakage. The hand lay-up process is one of the traditional processes for manufacturing composite materials and repairing blades.

[0004] With the development of modern composite materials technology, various types of hand-layup resin systems have continued to develop and are rich and diverse. Although the introduction of new materials and the improvement of manufacturing processes have enabled hand-layup resin systems to be applied to more advanced composite materials fields, the complexity and instability of the actual process have led to many problems that remain to be solved. The situation in the field of wind turbine blades is even more complicated. For example, in extremely cold weather, 1) the viscosity / crystallization of the operating product affects the convenience of construction at the maintenance site; 2) traditional thermal curing methods will cause the maintenance area to expand and contract due to heat and cold, resulting in delamination and cracking, bringing the risk of secondary maintenance. To date, there are still few related products on the market that can solve the above-mentioned contradictory problems at the same time. Summary of the invention

[0005] In order to solve the problems in the prior art, the present invention provides a photocurable hand-layup resin system for low-temperature environments in winter and a preparation method thereof. In extremely cold weather, the product has the characteristics of low viscosity, fast glass fiber infiltration, and high reaction activity. The advantage of photocurability provides convenience for blade maintenance and improves the winter maintenance efficiency of wind turbine blades.

[0006] The present invention solves the technical problem by adopting the following technical solutions:

[0007] The invention aims to provide a light-curing hand-lay-up resin system for low-temperature environment in winter, which comprises 20%-50% of oligomer and 50%-80% of active diluent.

[0008] Furthermore, the oligomer is at least one of bisphenol AEA, phenolic EA, amine-modified EA, and polyurethane-modified EA. The above oligomers are all one of epoxy acrylates (EA).

[0009] Furthermore, the oligomer adopts bisphenol AEA, amine-modified EA and polyurethane-modified EA in a mass ratio of 4:2:1.

[0010] Furthermore, the active diluent is at least one of dipropylene glycol diacrylate (DPGDA), tripropylene glycol diacrylate (TPGDA), 1,4-butanediol diacrylate (BDDA), 1,6-hexanediol diacrylate (HDDA), neopentyl glycol diacrylate (NPGDA), and trimethylolpropane triacrylate (TMPTA).

[0011] Furthermore, the active diluent is tripropylene glycol diacrylate and neopentyl glycol acrylate in a mass ratio of 1:1.

[0012] Further, it includes 20% bisphenol AEA, 10% amine-modified EA, 5% polyurethane-modified EA, 32.5% tripropylene glycol diacrylate and 32.5% neopentyl glycol acrylate.

[0013] Furthermore, it also includes photoinitiator: 0.5%-4%; pigment: 0.0005%-0.0015%; inhibitor: 0.1%-2%; defoamer: 0.1%-1%.

[0014] Furthermore, the photoinitiator is a composite of a cleavage-type free radical photoinitiator and a hydrogen abstraction-type free radical photoinitiator, such as Irgacure 500, referred to as 500, the pigment is phthalocyanine blue, the inhibitor is p-hydroxyanisole, and the defoaming agent is a polyether-modified dimethyl polysiloxane copolymer.

[0015] A method for preparing a light-curable hand-lay-up resin system for a low-temperature environment in winter, comprising the following steps:

[0016] Add the oligomer and active diluent in proportion to a planetary stirring kettle, heat and stir; after the oligomer is evenly dispersed in the active diluent, add the photoinitiator, stir and cool to room temperature, add the pigment, inhibitor and defoamer, continue stirring, and filter after cooling.

[0017] Further, the following steps are included:

[0018] Add the oligomer and active diluent in proportion to a planetary stirring kettle, heat to 50-70°C, stir in the dark for 4-6 hours at a stirring rate of 30-60 rpm; after the oligomer is evenly dispersed in the active diluent, add the photoinitiator, stir in the dark for 1-2 hours at a stirring rate of 30-60 rpm; after the stirring is completed, cool to room temperature, add the pigment, inhibitor and defoamer, continue stirring for 1-2 hours at a stirring rate of 30-60 rpm, and filter after cooling.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are:

[0020] 1) The present invention adopts highly active diluents and low-viscosity anti-crystallization oligomers. The product still has fluidity in extremely cold weather and has excellent wettability to glass fiber, which can significantly improve the efficiency and quality of winter blade maintenance.

[0021] 2) The present invention adopts a new light-curing method, which provides convenience for blade maintenance, improves the winter maintenance efficiency of wind turbine blades, and eliminates the delamination and cracking of blades caused by traditional thermal curing methods.

[0022] 3) The raw materials of the system of the present invention realize independent innovation, and all the materials are low-allergenic materials, which can reduce the harm of the materials to the human body, improve the construction environment, and meet the needs of the rapid development of wind turbine blades in the future.

[0023] 4) The light-curing hand-layup resin system for low-temperature winter environments of the present invention is a blue or green transparent liquid fluid, which can be stored at room temperature for up to 12 months. The curing conditions are 2h to 4h of ultraviolet light irradiation with a mercury arc lamp or an electrodeless lamp, and it is suitable for a construction environment of -25°C to 40°C.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above contents of the present invention and its objectives, features and advantages more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a picture of a physical product prepared by a light-curing hand-layup resin system for low-temperature environments in winter according to the present invention. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary illustrations and explanations of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope that the present invention is intended to protect.

[0027] In addition, unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0028] Example 1

[0029] A preparation method of a light-curing hand-lay-up resin system for low-temperature environments in winter:

[0030] 35% oligomer 1 (bisphenol AEA), 15% oligomer 2 (amine-modified EA), 25% active diluent 1 (NPGDA) and 25% active diluent 2 (TPGDA) were added to a planetary stirring kettle in proportion, heated to 60°C, stirred for 4 hours in a dark place at a stirring rate of 30 rpm, after the oligomer was evenly dispersed in the active diluent, 0.5% liquid photoinitiator Irgacure500 was added, stirred for 1 hour in a dark place at a stirring rate of 30 rpm, cooled to room temperature after the stirring was completed, 0.0015% phthalocyanine blue pigment powder, 2% p-hydroxyanisole and 1% polyether-modified dimethylpolysiloxane copolymer were added, stirring was continued for 1 hour at a stirring rate of 30 rpm, filtered and packaged after cooling to obtain the material for standby use.

[0031] Example 2

[0032] A preparation method of a light-curing hand-lay-up resin system for low-temperature environments in winter:

[0033] 30% oligomer 1 (bisphenol AEA), 14% oligomer 2 (amine-modified EA), 1% oligomer 3 (polyurethane-modified EA), 30% active diluent 1 (NPGDA) and 25% active diluent 2 (TPGDA) are added to a planetary stirring kettle in proportion, heated to 70°C, stirred for 6 hours in a dark place at a stirring rate of 60 rpm, after the oligomer is evenly dispersed in the active diluent, 4% liquid photoinitiator Irgacure500 is added, stirred for 2 hours in a dark place at a stirring rate of 60 rpm, cooled to room temperature after the stirring is completed, 0.0005% phthalocyanine blue pigment powder, 0.1% p-hydroxyanisole and 0.1% polyether-modified dimethylpolysiloxane copolymer are added, stirring is continued for 2 hours at a stirring rate of 60 rpm, filtered and packaged after cooling to obtain the material for standby use.

[0034] Example 3

[0035] A preparation method of a light-curing hand-lay-up resin system for low-temperature environments in winter:

[0036] 20% oligomer 1 (bisphenol AEA), 10% oligomer 2 (amine-modified EA), 5% oligomer 3 (polyurethane-modified EA), 32.5% active diluent 1 (NPGDA) and 32.5% active diluent 2 (TPGDA) are added to a planetary stirring kettle in proportion, heated to 50° C., stirred for 4 hours in a dark environment at a stirring rate of 40 rpm, after the oligomers are uniformly dispersed in the active diluent, 0.5% liquid photoinitiator Irgacure500 is added, stirred for 1.5 hours in a dark environment at a stirring rate of 40 rpm, cooled to room temperature after the stirring is completed, 0.001% phthalocyanine blue pigment powder, 1% p-hydroxyanisole and 0.5% polyether-modified dimethylpolysiloxane copolymer are added, stirring is continued for 1.5 hours at a stirring rate of 40 rpm, filtered and packaged after cooling to obtain the material for standby use.

[0037] Example 4

[0038] A preparation method of a light-curing hand-lay-up resin system for low-temperature environments in winter:

[0039] 20% oligomer 1 (bisphenol AEA), 10% oligomer 2 (amine-modified EA), 5% oligomer 3 (polyurethane-modified EA), 32.5% active diluent 1 (NPGDA) and 32.5% active diluent 2 (TPGDA) are added to a planetary stirring kettle in proportion, heated to 60° C., stirred for 5 hours in a dark place at a stirring rate of 45 rpm, after the oligomer is evenly dispersed in the active diluent, 1% liquid photoinitiator Irgacure500 is added, stirred for 1.5 hours in a dark place at a stirring rate of 45 rpm, cooled to room temperature after the stirring is completed, 0.001% phthalocyanine blue pigment powder, 2% p-hydroxyanisole and 0.5% polyether-modified dimethylpolysiloxane copolymer are added, stirring is continued for 1.5 hours at a stirring rate of 45 rpm, filtered and packaged after cooling to obtain the material for standby use.

[0040] The actual performance of the products prepared by the preparation methods of the above-mentioned Examples 1-4 was analyzed by testing the viscosity, mechanical properties and glass transition temperature, as shown in Tables 1 and 2 below.

[0041] Table 1: Physical and chemical properties test results

[0042]

[0043]

[0044] Table 2: Mechanical properties test results

[0045]

[0046] From the above experiments, it can be seen that the present invention solves the problems of poor fluidity and poor glass fiber infiltration of the hand-laid resin system in extremely cold weather; the application of the new photocuring system provides convenience for blade repair, eliminates the delamination and cracking of composite materials, and improves the quality and efficiency of the overall wind turbine blade winter repair. Therefore, the product of the present invention is suitable for the repair and rectification of wind turbine blades in low-temperature environments, filling the gap in winter repair products in the wind power operation and maintenance market.

[0047] The serial numbers of the embodiments of the present invention described above are only for description and do not represent the advantages or disadvantages of the embodiments.

[0048] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit and scope protected by the claims of the present invention. These all fall within the protection scope of the present invention.

Claims

1. A light-curable hand-lay-up resin system for low-temperature environments in winter, characterized in that: It comprises 20%-50% of oligomer and 50%-80% of active diluent.

2. A light-curable hand-lay-up resin system for low-temperature environments in winter as claimed in claim 1, characterized in that: The oligomer is at least one of bisphenol AEA, phenolic EA, amine-modified EA and polyurethane-modified EA.

3. A light-curable hand-lay-up resin system for low-temperature environments in winter as claimed in claim 2, characterized in that: The oligomer adopts bisphenol AEA, amine-modified EA and polyurethane-modified EA in a mass ratio of 4:2:

1.

4. A light-curable hand-lay-up resin system for low-temperature winter environments as claimed in claim 3, characterized in that: The active diluent is at least one of dipropylene glycol diacrylate, tripropylene glycol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate and trimethylolpropane triacrylate.

5. A light-curable hand-lay-up resin system for low-temperature environments in winter as claimed in claim 4, characterized in that: The active diluent is tripropylene glycol diacrylate and neopentyl glycol acrylate in a mass ratio of 1:

1.

6. A light-curable hand-lay-up resin system for low-temperature environments in winter as claimed in claim 5, characterized in that: It includes 20% bisphenol AEA, 10% amine-modified EA, 5% polyurethane-modified EA, 32.5% tripropylene glycol diacrylate and 32.5% neopentyl glycol acrylate.

7. A light-curable hand-lay-up resin system for low-temperature environments in winter as claimed in claim 1, characterized in that: Also includes photoinitiator: 0.5%-4%; Pigment: 0.0005%-0.0015%; Inhibitor: 0.1%-2%; Defoaming agent: 0.1%-1%.

8. A light-curable hand-lay-up resin system for low-temperature winter environments as claimed in claim 7, characterized in that: The photoinitiator adopts a composite of a cleavage-type free radical photoinitiator and a hydrogen-abstracting free radical photoinitiator, the pigment adopts phthalocyanine blue, the inhibitor adopts p-hydroxyanisole, and the defoamer adopts a polyether-modified dimethyl polysiloxane copolymer.

9. A method for preparing a light-curable hand-lay-up resin system for low-temperature environments in winter according to any one of claims 1 to 8, characterized in that: The following steps are involved: Add the oligomer and active diluent in proportion to a planetary stirring kettle, heat and stir; after the oligomer is evenly dispersed in the active diluent, add the photoinitiator, stir and cool to room temperature, add the pigment, inhibitor and defoamer, continue stirring, and filter after cooling.

10. The method for preparing a light-curable hand-lay-up resin system for low-temperature environments in winter as claimed in claim 9, characterized in that: The following steps are involved: Add the oligomer and active diluent in proportion to a planetary stirring kettle, heat to 50-70°C, stir in the dark for 4-6 hours at a stirring rate of 30-60 rpm; after the oligomer is evenly dispersed in the active diluent, add the photoinitiator, stir in the dark for 1-2 hours at a stirring rate of 30-60 rpm; after the stirring is completed, cool to room temperature, add the pigment, inhibitor and defoamer, continue stirring for 1-2 hours at a stirring rate of 30-60 rpm, and filter after cooling.

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