阅读说明：本技术 一种风电叶片前缘防护材料及其制备方法和应用 (Wind power blade leading edge protective material and preparation method and application thereof ) 是由 谢映雪 曹梓东 李永鸿 林燕 于 2020-12-15 设计创作，主要内容包括：本发明公开了一种风电叶片前缘防护材料及其制备方法和应用,所述的风电叶片前缘防护材料,包括PVDF膜和环氧树脂基涂层；其中,环氧树脂基涂层按重量份数计,包括组分：环氧树脂100份；引发剂0.4～1.5份；溶剂8～20份。本发明的风电叶片前缘防护材料,通过采用辐照接枝的方法在PVDF膜表面形成一层极性的环氧树脂涂层,从而提高PVDF膜的粘接性能,可在风电叶片灌注成型时与叶片一体成型固化,实现PVDF膜与风电叶片表面的紧固粘接,对风电叶片前缘的防护效果佳、防护周期长,满足风电叶片前缘防护材料在叶片服役周期能够有效防护且免维修的需求。(The invention discloses a wind power blade leading edge protective material and a preparation method and application thereof, wherein the wind power blade leading edge protective material comprises a PVDF film and an epoxy resin-based coating; the epoxy resin-based coating comprises the following components in parts by weight: 100 parts of epoxy resin; 0.4-1.5 parts of an initiator; 8-20 parts of a solvent. According to the wind power blade leading edge protective material, the epoxy resin coating with the polarity is formed on the surface of the PVDF film by adopting an irradiation grafting method, so that the bonding performance of the PVDF film is improved, the PVDF film and the blade can be integrally molded and cured when the wind power blade is cast and molded, the PVDF film and the surface of the wind power blade are fastened and bonded, the protective effect on the leading edge of the wind power blade is good, the protective period is long, and the requirements of effective protection and maintenance-free of the wind power blade leading edge protective material in the service period of the blade are met.)

1. The wind power blade leading edge protective material is characterized by comprising a PVDF film and an epoxy resin-based coating; the epoxy resin-based coating is coated on the PVDF membrane and is grafted with the surface of the PVDF membrane through irradiation; the epoxy resin-based coating comprises the following components in parts by weight:

100 parts of epoxy resin;

0.4-1.5 parts of an initiator;

8-20 parts of a solvent.

2. The wind power blade leading edge protective material as claimed in claim 1, wherein the epoxy value of the epoxy resin is 0.3-0.56.

3. The leading edge protective material of the wind-power blade as claimed in claim 1, wherein the initiator is selected from any one or more of diphenyliodonium hexafluorophosphate, bis (4-tert-butylbenzene) iodonium hexafluorophosphate, 4-isopropyl-4 'methyldiphenyliodonium tetrakis (pentafluorophenyl) borate or 4, 4' -dimethyldiphenyliodonium hexafluorophosphate.

4. The wind power blade leading edge protective material as claimed in claim 1, wherein the solvent is selected from any one or more of acetone, absolute ethyl alcohol or methanol.

5. The wind power blade leading edge protective material as claimed in claim 1, wherein the thickness of the PVDF film is 200-800 microns; the tensile strength of the PVDF film is more than or equal to 30 MPa.

6. The wind power blade leading edge protective material as claimed in claim 1, wherein the epoxy resin-based coating further comprises 0-15 parts by weight of a curing agent; the curing agent is selected from one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylene tetramine, diethylaminopropylamine or m-phenylenediamine.

7. The preparation method of the wind power blade leading edge protective material according to any one of claims 1 to 6, characterized by comprising the following steps: according to the proportion, an initiator is dissolved in a solvent, then added into epoxy resin and uniformly stirred, then uniformly coated on a PVDF membrane, and then irradiated with the irradiation dose of 1-8 Mrad to prepare the wind power blade front edge protective material.

8. The method for preparing the protective material for the leading edge of the wind power blade as claimed in claim 7, wherein an electron accelerator or a cobalt source is used for irradiation.

9. The application of the wind power blade leading edge protective material according to any one of claims 1 to 6, wherein the wind power blade leading edge protective material is integrally formed and cured with the wind power blade during the wind power blade pouring forming.

Technical Field

The invention relates to the technical field of wind power blade protection, in particular to a wind power blade leading edge protection material and a preparation method and application thereof.

Background

The epoxy resin has good mechanical property, chemical corrosion resistance and size stability, is a preferred material for large-scale wind power blades, and at present, the wind power blades are mostly prepared from glass fiber or carbon fiber reinforced epoxy resin. The wind turbine generator is generally installed in remote areas, the operation environment is severe, the blade is used as the only component for capturing wind energy, and the front edge of the blade is the most easily corroded part on the wind turbine blade due to long-term friction of wind power and impact of sand, salt mist and rainwater; particularly, the tip leading edge portion of the blade is thin and the linear speed of the tip running is high, so that the erosion of the portion is the most serious in the whole blade. After the front edge of the wind power blade is corroded, the aerodynamic appearance of the wind power blade is influenced, so that the generated energy of a wind turbine generator is reduced; if the corrosion problem of the front edge of the blade is not solved in time, the blade can be seriously damaged along with the lapse of time, and hidden dangers are brought to the safe operation of the wind turbine generator. Therefore, leading edge protection is a significant challenge in large blade development.

At present, the front edge protection of the blade generally adopts a method of attaching a front edge protection film. The protective film has strict requirements on the construction process, the surface of the front edge film pasting area needs to be polished and cleaned by using fine abrasive paper before film pasting, the workload is large, and tiny bubbles are not allowed in the film pasting process; the protective film is easily damaged in the transportation and hoisting processes of the blade, the blade often has the phenomena of bubbling, edge rolling, weathering and displacement of the protective film at the blade tip and the like in the operation process, the service life of the protective film is generally only 4-5 years, the protective film needs to be replaced again, and the maintenance cost is very high. The existing front edge protective paint product in the prior art can be used for protecting the front edge of the blade and is mainly coated in a conventional paint spraying, brushing or rolling manner, but the front edge protective paint has short operable time and narrow temperature and humidity operating range, is only suitable for factory manufacture and cannot be applied to field front edge protective maintenance of the wind power blade.

PVDF (polyvinylidene fluoride) has the characteristics of excellent weather resistance, wear resistance, toughness, pulverization resistance and the like, the outdoor service life of the PVDF coating can reach more than 20 years, and the maintenance-free requirement of the protective material at the front edge of the wind power blade in the service period of the blade can be met, but the PVDF coating needs to be baked at high temperature during coating, the processing process is complicated, and the application of the PVDF coating on the wind power blade is limited; the PVDF film has poor surface viscosity, is difficult to bond with the surface of the wind power blade, and has poor protection effect when being used for protecting the front edge of the wind power blade in a film pasting mode.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention mainly aims to provide the wind power blade front edge protective material which is convenient to use, high in bonding strength with the surface of a wind power blade, good in protective effect on the wind power blade front edge and long in protective period.

The invention also aims to provide a preparation method of the wind power blade leading edge protective material.

The invention is realized by the following technical scheme:

a wind power blade leading edge protective material comprises a PVDF film and an epoxy resin-based coating; the epoxy resin-based coating is coated on the PVDF membrane and is grafted with the surface of the PVDF membrane through irradiation; the epoxy resin-based coating comprises the following components in parts by weight:

100 parts of epoxy resin;

0.4-1.5 parts of an initiator;

8-20 parts of a solvent.

The epoxy resin-based coating is coated on one side, bonded with the wind power blade, of the PVDF film. According to the invention, the epoxy resin and the PVDF film are subjected to polymerization grafting, and a polar coating is formed on the surface of the PVDF film, so that the bonding performance of the PVDF film and the surface of the wind power blade is effectively improved; preferably, the epoxy value of the epoxy resin is 0.3-0.56.

The initiator is selected from any one or more of diphenyliodonium hexafluorophosphate, bis (4-tert-butyl benzene) iodonium hexafluorophosphate, 4-isopropyl-4 'methyl diphenyliodonium tetrakis (pentafluorophenyl) borate or 4, 4' -dimethyl diphenyliodonium hexafluorophosphate.

The solvent is selected from any one or more of acetone, absolute ethyl alcohol or methanol.

Preferably, the PVDF film adopted by the invention has the thickness of 200-800 microns, so that the impact force of raindrops, sand grains and the like on the wind power blade can be effectively buffered, and the damage to the wind power blade is reduced.

Preferably, the tensile strength of the PVDF film is more than or equal to 30Mpa, so that the impact of raindrops, wind sand and the like on the PVDF film can be effectively resisted, and the service life of the protective material is ensured.

The invention can also improve the bonding strength of the PVDF film by adding the curing agent into the epoxy resin-based coating, and the dosage of the curing agent cannot be too much, otherwise, the epoxy resin can be completely cured, and the PVDF film cannot be effectively bonded with the surface of the wind power blade. The epoxy resin-based coating comprises 0-15 parts by weight of a curing agent; the curing agent is selected from one or more of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylene tetramine, diethylaminopropylamine or m-phenylenediamine.

The invention also provides a preparation method of the wind power blade leading edge protective material, which comprises the following steps: according to the proportion, an initiator is dissolved in a solvent, then added into epoxy resin and uniformly stirred, then uniformly coated on a PVDF membrane, and then irradiated with the irradiation dose of 1-8 Mrad to prepare the wind power blade front edge protective material.

The invention carries out surface modification on the PVDF film by irradiation technology. After the PVDF film coated with the epoxy resin-based coating is irradiated, epoxy resin is grafted to the PVDF and generates a certain degree of curing, the fluidity is poor, but the curing is incomplete, the surface is sticky, and the PVDF film has good bonding performance. The irradiation dose of the invention is controlled to be 1-8 Mrad, the irradiation dose is too small, the grafting reaction of epoxy resin and PVDF membrane can not be initiated, and the curing degree of the resin is low; the epoxy resin can be completely cured due to excessive irradiation dose, and the bonding property is poor. The invention can adopt an electron accelerator or a cobalt source to carry out irradiation modification on the PVDF film.

The invention also provides application of the wind power blade front edge protective material, wherein the wind power blade front edge protective material is added during vacuum infusion molding of a wind power blade, and is integrally molded and cured with the wind power blade, so that fastening and bonding of a PVDF film and the surface of the wind power blade are realized.

Compared with the prior art, the invention has the following beneficial effects:

according to the wind power blade leading edge protective material, a polar epoxy resin coating is formed on the surface of a PVDF film by adopting an irradiation grafting method, so that the bonding performance of the PVDF film is remarkably improved; the PVDF film protective layer is very convenient to use, can be integrally formed and cured with the wind power blade during the pouring and forming of the wind power blade, can be formed on the surface of the wind power blade, is fastened and bonded with the wind power blade, does not have the problems of bubbling, edge rolling, weathering displacement and the like in the using process, has a good protective effect on the front edge of the wind power blade and a long protective period, and meets the requirement that the protective material for the front edge of the wind power blade can be effectively protected and is free of maintenance in the service period of the blade; the PVDF film is further effectively applied to the protection of the front edge of the wind power blade, and the problems of short service life and high installation and maintenance cost of the conventional wind power blade front edge protection material are solved.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

The starting materials used in the examples and comparative examples are commercially available, but are not limited to these materials:

epoxy resin 1: an epoxy value of 0.52;

epoxy resin 2: an epoxy value of 0.44;

epoxy resin 3: an epoxy value of 0.35;

curing agent: diethylaminopropylamine;

initiator 1: 4, 4' -dimethyldiphenyliodonium hexafluorophosphate;

initiator 2: diphenyliodonium hexafluorophosphate;

initiator 3: bis (4-tert-butylbenzene) iodonium hexafluorophosphate;

initiator 4: 4-isopropyl-4' -methyldiphenyliodonium tetrakis (pentafluorophenyl) borate;

solvent: acetone; absolute ethyl alcohol; methanol.

The preparation method of the wind power blade leading edge protective material of the embodiment and the comparative example comprises the following steps:

according to the proportion shown in the table 1, an initiator is dissolved in a solvent, then the solvent and a curing agent are added into epoxy resin together and uniformly stirred, then the epoxy resin is uniformly coated on a PVDF membrane, an electron accelerator is adopted for irradiation, and the irradiation dose is 1-8 Mrad, so that the wind power blade front edge protective material is prepared.

The related performance test method comprises the following steps:

and (3) testing stripping performance: the protective materials for the leading edge of the wind power blade prepared in the examples and the comparative examples are compounded with glass fiber reinforced plastics by using epoxy resin, and then the peel force of the protective materials is tested according to the standard GB/T2790-1995.

Table 1: concrete proportions (in parts by weight) of components of epoxy resin-based coatings of examples 1-6 and comparative examples 1-3 and performance test results

Table 1 is shown below:

the wind power blade front edge protective material prepared by the embodiment is added during vacuum infusion molding of the wind power blade, can be integrally molded and cured with the wind power blade, and is difficult to peel off after curing.

As can be seen from the above examples and comparative examples, the invention remarkably improves the adhesive property of the PVDF film by coating the PVDF film with the epoxy resin-based coating, then initiating the surface grafting and partial curing of the epoxy resin and the PVDF film through irradiation, and can realize the fastening and adhesion of the PVDF film and the surface of the wind power blade.