CN115960525A - Asparagus polyurea wind power blade gel coat and preparation method thereof - Google Patents

Abstract

The invention relates to the field of chemical coatings, and particularly relates to an asparagus polyurea wind power blade gel coat and a preparation method thereof. The asparagus polyurea wind power blade gel coat contains a component A and a component B, wherein the component A comprises a polyaspartic ester resin, diisocyanate, amino-terminated polyether, an auxiliary agent, a thixotropic agent, a molecular sieve, a pigment and a filler; the component B is a polyisocyanate curing agent. The aspartyl polyurea wind power blade gel coat provided by the invention modifies polyaspartic ester resin through diisocyanate and amino-terminated polyether, so that the activity of the polyaspartic ester resin can be reduced to prolong the operable time of the coating, the polyaspartic ester has the flexibility of polyether, the finished coating has excellent mechanical properties, various construction modes such as spraying and roller coating can be met, the long-acting protection effect on blades can be achieved, and the maintenance cost of the blades can be reduced.

Description

Asparagus polyurea wind power blade gel coat and preparation method thereof

Technical Field

The invention relates to the field of chemical coatings, and particularly relates to an asparagus polyurea wind power blade gel coat and a preparation method thereof.

Background

The fan blade is mainly made of fiber-reinforced epoxy resin and unsaturated polyester, when the blade runs at a high speed, the tip speed generally exceeds 100m/s, and the unprotected blade is exposed in the natural environment for a long time and suffers from large temperature difference, strong illumination, wind and sand abrasion, acid and rain corrosion, ice and snow invasion, abrasion and aging phenomena occur until the blade is broken. The simplest and most effective protection method at present is to use paint for protection. The resin which can be applied to the wind power blade coating mainly comprises polyurethane resin, fluorocarbon resin, organic silicon resin, epoxy resin and polyaspartic ester resin. In order to achieve the best protection, the protective coating is generally designed according to two layers of the bottom surface, the bottom layer is called as a gel coat, so that good mechanical properties and mechanical properties can be provided, the whole coating is not easy to crack due to deformation and damage caused by wind, sand and rain erosion, and the surface layer provides good ageing resistance and resists wind, sun and rain.

The use of aspartyl polyurea coatings, which are formed by curing polyaspartic esters with polyisocyanates, on wind blades has become widespread, polyaspartic resins being prepared by reacting dialkyl maleates with aliphatic primary diamines, the choice of which makes it possible to obtain gels of from a few minutes to 2 hours and also makes it possible to adjust the toughness to the rigidity of the aspartyl polyurea. In practical application, however, the operability time of the aspartyl polyurea coating is still short, the operability time of a solvent-free system is short, and the elasticity of the aspartyl polyurea coating can be realized by compounding other elastic materials or adopting an elastic curing agent.

For example, the asparagus polyurea elastic anticorrosive paint is developed by adopting polyether type and polyester type elastic curing agents as published in the asparagus polyurea elastic anticorrosive paint development and performance research in the Chinese chemical trade, 2018, 27.

For another example, patent document CN106243981B discloses a wind power blade coating with high wind and sand erosion resistance, which is prepared by compounding polyaspartic resin and polyurethane resin to obtain good elasticity, wherein the polyurethane resin contains two primary amine groups or two primary hydroxyl groups, and provides good wear resistance and elasticity after curing. The polyurethane resin and the solvent system jointly prolong the pot life of the system.

Disclosure of Invention

In order to solve the problem that the operability time of the aspartic polyurea coating in the prior art is still short, the invention provides an aspartic polyurea wind power blade gel coat which comprises a component A and a component B, wherein the component A comprises a polyaspartic ester resin, diisocyanate, an amino-terminated polyether, an auxiliary agent, a thixotropic agent, a molecular sieve, a pigment and a filler; the component B is a polyisocyanate curing agent.

In one embodiment, the polyaspartate resin is a tough polyaspartate resin with a viscosity of 200cP or less without a solvent.

In one embodiment, the diisocyanate is one or two of hexamethylene diisocyanate HD I, isophorone diisocyanate I PD I.

In one embodiment, the amino-terminated polyether is one or more of D230, D1000, D2000.

In one embodiment, the mass ratio of the polyaspartic acid ester resin to the amino-terminated polyether is 45-60: 5-15, wherein the molar ratio of the amino-terminated polyether to the diisocyanate is 1.

In one embodiment, the thixotropic agent is a conventional polyamide wax.

In one embodiment, the molecular sieve is at least one of the 3A, 4A, 5A types, but not limited thereto.

In one embodiment, the filler is at least one of mica powder, melamine powder and feldspar powder, but not limited thereto.

In one embodiment, the polyisocyanate curing agent is at least one of hexamethylene diisocyanate trimer (HD I), isophorone diisocyanate trimer (ippd I), dicyclohexylmethane diisocyanate trimer (H12 MD I), but not limited thereto.

In one embodiment, the auxiliaries include wetting dispersants, defoamers, and leveling agents.

Preferably, the wetting dispersant is Un i qsperse 710S, BYK-110; the defoaming agent is a composite defoaming agent mixed by organic silicon and other polymers; the leveling agent is an acrylate leveling agent or an organic silicon leveling agent with a defoaming function.

In one embodiment, the component A comprises 45-60 parts by weight of polyaspartic ester resin, 1-5 parts by weight of diisocyanate, 5-15 parts by weight of amino-terminated polyether, 0.5-3 parts by weight of auxiliary agent, 0.5-1 part by weight of thixotropic agent, 1-5 parts by weight of molecular sieve, 10-15 parts by weight of pigment and 10-20 parts by weight of filler, and the component B is polyisocyanate curing agent, and the dosage of the component B is that the ratio of NH of polyaspartic ester to NCO in a coating system is 1.05.

In one embodiment, the pigment is titanium dioxide, but not limited thereto. Besides, color paste can be used for modulating the color.

The invention also provides a preparation method of the aspartic polyurea wind power blade gel coat, wherein the preparation method of the component A comprises the steps of reacting the polyaspartic acid ester resin, the diisocyanate and the amino-terminated polyether, then adding the auxiliary agent, the thixotropic agent, the molecular sieve, the pigment and the filler, mixing, dispersing uniformly and filtering to obtain the component A;

and mixing the component A and the component B according to a proportion to obtain the asparagus polyurea wind power blade gel coat.

Specifically, the preparation method of the component A comprises the following preparation steps:

the preparation method of the component A comprises the following steps:

s100, respectively carrying out vacuum dehydration on the polyaspartic acid ester resin and the amino-terminated polyether for about 1h at the temperature of 60-100 ℃, and cooling for later use;

s200, adding the dewatered poly (aspartic ester) resin into a four-neck flask, introducing dry nitrogen, dropwise adding diisocyanate, continuously stirring for 1-3 hours while dropwise adding, dropwise adding amine-terminated polyether, and continuously stirring for 15-30 min while dropwise adding to obtain amine-terminated polyether modified poly (aspartic ester) resin;

s300, weighing the prepared modified polyaspartic ester resin and the auxiliary agent in a paint tank, and uniformly dispersing at the rotating speed of 1000-1500 r/min;

s400, adding pigment, filler and thixotropic agent, and uniformly dispersing at the rotating speed of 1000-1500 r/min;

s500, sanding for 15-40 min until the fineness is qualified, adding a molecular sieve, and then grinding for 5-10 min; adding color paste for color mixing, and filtering to obtain component A.

Based on the above, compared with the prior art, the asparagus polyurea wind power blade gel coat provided by the invention has the following technical effects and principles:

(1) The modified polyaspartic acid ester is further cured by a polyisocyanate curing agent to obtain the aspartic polyurea blade gel coat with excellent toughness.

(2) The blade has excellent toughness and long service life, meets the construction modes of spraying, roller coating and the like, can play a long-acting protection role on the blade, and reduces the maintenance cost of the blade.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objects and other advantages of the present invention can be realized and attained by the means described in the specification and claims.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; the technical features devised in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be noted that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, and are not to be construed as limiting the present invention; it will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The invention provides the formulations of the examples and comparative examples shown in the following table:

TABLE 1

Name of raw material of component A	Example 1	Example 2	Example 3	Comparative example
					Polyaspartic acid ester resin	60	50	45	60
Diisocyanate HDI	4.2	0	0	0
					Diisocyanate IPDI	0	2.2	1.7	0
Amino-terminated polyether D230	6	0	0	0
					Amino-terminated polyether D1000	0	10	0	0
Amino-terminated polyether D2000	0	0	15	0
					Wetting and dispersing agent	0.5	0.7	1	0.5
Defoaming agent	0.5	0.3	0.8	0.5
					Leveling agent	0.7	0.5	1	0.7
Thixotropic agent	0.5	0.7	1	0.5
					Molecular sieves	3	3	5	3
Titanium white powder	10.5	13	15	10.5
					Feldspar powder	7	10	5.8	7
Ming-nai powder	6.6	9	8	6.6
					Carbon black color paste	0.5	0.6	0.7	0.5
Total up to	100	100	100	89.8
					Name of raw material B	Example 1	Example 2	Example 3	Comparative example
Polyisocyanate curing agent	30	29.3	27	39.7
					Proportion of A to B	100/30	100/29.3	100/27	89.8/39.7

The polyaspartic acid ester resin is F426 from Feiyang company; the wetting dispersant is Un i qsperse 710S; the antifoaming agent is Un i qfoam272S; the leveling agent is Un i qf l ow 384S; the thixotropic agent is polyamide wax; the molecular sieve is 3A type; the polyisocyanate curing agent was N3600.

It should be noted that the specific parameters or some common reagents in the above embodiments are specific examples or preferred embodiments of the present invention, and are not limited thereto; those skilled in the art can adapt the same within the spirit and scope of the present invention.

In addition, the raw materials used may be those commercially available or prepared by methods conventional in the art, unless otherwise specified.

The invention also provides a preparation method of the embodiment, which comprises the following steps:

the preparation method of the component A comprises the following steps:

s100, respectively carrying out vacuum dehydration on the polyaspartic acid ester resin and the amino-terminated polyether for about 1h at the temperature of 60-100 ℃, and cooling for later use;

s200, adding the dewatered polyaspartic ester resin into a four-neck flask, introducing dry nitrogen, dropwise adding diisocyanate, continuously stirring for 1-3 hours while dropwise adding, dropwise adding amino-terminated polyether, and continuously stirring for 15-30 min while dropwise adding to obtain amino-terminated polyether modified polyaspartic ester resin;

s300, weighing the prepared modified polyaspartic ester resin and the auxiliary agent in a paint tank, and uniformly dispersing at the rotating speed of 1000-1500 r/min;

s400, adding a pigment, a filler and a thixotropic agent, and uniformly dispersing at a rotating speed of 1000-1500 r/min;

s500, sanding for 15-40 min until the fineness is qualified, adding a molecular sieve, and then grinding for 5-10 min; adding color paste for color mixing, and filtering to obtain component A.

And mixing the component A and the component B according to a proportion to obtain the asparagus polyurea wind power blade gel coat.

The coatings prepared in the above examples and comparative examples were subjected to the performance test, and the test results are shown in table 2.

Table 2 example performance data

As can be seen from the test results in Table 2, on the premise of satisfying good weather resistance, salt mist resistance and corrosion resistance, the operable time of the coating prepared by the embodiment is longer than that of the comparative example, and the indexes of tensile strength and elongation at break are obviously better than those of the comparative example, so that the modification of the polyaspartic ester resin by diisocyanate and amino terminated polyether can not only reduce the activity of the polyaspartic ester resin to prolong the operable time of the coating, but also enable the polyaspartic ester to have the flexibility of polyether, and enable the finished coating to have excellent mechanical properties.

In conclusion, the asparagus polyurea wind power blade gel coat provided by the invention has good weather resistance and salt spray resistance, has excellent toughness and operation time, can meet various construction modes such as spraying, roller coating and the like, can play a long-acting protection role on the blade, and reduces the maintenance cost of the blade.

In addition, it will be appreciated by those skilled in the art that, notwithstanding the many problems inherent in the prior art, each embodiment or solution of the present invention may be improved in one or more respects, without necessarily simultaneously solving all the technical problems inherent in the prior art or in the background art. It will be understood by those skilled in the art that nothing in a claim should be taken as a limitation on that claim.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides an asparagus polyurea wind-powered electricity generation blade gel coat which characterized in that: the paint comprises a component A and a component B, wherein the component A comprises polyaspartic ester resin, diisocyanate, amino-terminated polyether, an auxiliary agent, a thixotropic agent, a molecular sieve, a pigment and a filler; the component B is a polyisocyanate curing agent.

2. The polyurea-aspart wind blade gel coat of claim 1, wherein: the mass ratio of the polyaspartic acid ester resin to the amino-terminated polyether is 45-60: 5-15, wherein the molar ratio of the amino-terminated polyether to the diisocyanate is 1.

3. The polyurea-aspart wind blade gel coat of claim 1, wherein: the thixotropic agent is a conventional polyamide wax.

4. The polyurea elastomer composition as claimed in claim 1, wherein: the molecular sieve is at least one of 3A, 4A and 5A types.

5. The polyurea elastomer composition as claimed in claim 1, wherein: the filler is at least one of mica powder, melamine powder and feldspar powder.

6. The polyurea elastomer composition as claimed in claim 1, wherein: the polyisocyanate curing agent is at least one of hexamethylene diisocyanate trimer, isophorone diisocyanate trimer and dicyclohexylmethane diisocyanate trimer.

7. The polyurea-aspart wind blade gel coat of claim 1, wherein: the auxiliary agent comprises a wetting dispersant, a defoaming agent and a flatting agent.

8. The polyurea elastomer composition as claimed in claim 1, wherein: the component A comprises, by weight, 45-60 parts of polyaspartic ester resin, 1-5 parts of diisocyanate, 5-15 parts of amino-terminated polyether, 0.5-3 parts of auxiliary agent, 0.5-1 part of thixotropic agent, 1-5 parts of molecular sieve, 10-15 parts of pigment and 10-20 parts of filler, and the component B is a polyisocyanate curing agent, wherein the ratio of NH of polyaspartic ester to NCO in a coating system is 1.05.

9. A method for preparing an aspartyl polyurea wind turbine blade gel coat according to any one of claims 1 to 8, wherein the method comprises the following steps:

the preparation method of the component A comprises the steps of reacting polyaspartic ester resin, diisocyanate and amino-terminated polyether, then adding an auxiliary agent, a thixotropic agent, a molecular sieve, a pigment and a filler, mixing, dispersing uniformly and filtering to obtain the component A;

and mixing the component A and the component B according to a proportion to obtain the asparagus polyurea wind power blade gel coat.

10. The method for preparing an aspartic polyurea wind turbine blade gel coat according to claim 9, wherein the method for preparing the component A comprises the following steps:

s100, respectively carrying out vacuum dehydration on the polyaspartic acid ester resin and the amino-terminated polyether at the temperature of 60-100 ℃, and then cooling for later use;

s200, adding the dewatered polyaspartic ester resin into a four-neck flask, introducing dry nitrogen, dropwise adding diisocyanate, continuously stirring for 1-3 h while dropwise adding, dropwise adding amino-terminated polyether, and continuously stirring for 15-30 min while dropwise adding to obtain amino-terminated polyether modified polyaspartic ester resin;

s300, weighing the prepared modified polyaspartic ester resin and the auxiliary agent in a paint tank, and uniformly dispersing at the rotating speed of 1000-1500 r/min;

s400, adding pigment, filler and thixotropic agent, and uniformly dispersing at the rotating speed of 1000-1500 r/min;

s500, sanding for 15-40 min until the fineness is qualified, adding a molecular sieve, and then grinding for 5-10 min; adding color paste for color mixing, and filtering to obtain component A.