阅读说明：本技术 一种多聚膦酸酯作为脱模剂的应用、树脂及拉挤板材 (Application of polyphosphonate as mold release agent, resin and pultruded panel ) 是由 曾鸿鸣 杨玉荣 宋秋香 王战坚 陈淳 于 2020-07-06 设计创作，主要内容包括：本发明提供一种多聚膦酸酯作为脱模剂的应用,多聚膦酸酯可以以分子形式分散在液态树脂中,树脂固化后在拉挤板材的表面形成一层多聚膦酸酯单分子层,从而实现拉挤板材的脱模；通过真空灌注方法将上述拉挤板材制备大梁结构的过程中,拉挤板材表面的多聚膦酸酯单分子层可以快速溶解和扩散在灌注树脂中,从而使灌注树脂和拉挤板材之间形成一个完整的粘接界面,避免了各拉挤板材之间的粘接不充分对大梁结构强度产生的不良影响；此外,多聚膦酸酯还具有界面增强的效果,从而增强了拉挤板材的强度,也使大梁结构的强度有所增加。(The invention provides an application of polyphosphonate as a release agent, wherein polyphosphonate can be dispersed in liquid resin in a molecular form, and a layer of polyphosphonate monomolecular layer is formed on the surface of a pultruded plate after the resin is cured, so that the demoulding of the pultruded plate is realized; in the process of preparing the girder structure from the pultruded panel by the vacuum infusion method, the polyphosphonate monomolecular layer on the surface of the pultruded panel can be quickly dissolved and diffused in the infusion resin, so that a complete adhesion interface is formed between the infusion resin and the pultruded panel, and the adverse effect on the structural strength of the girder caused by insufficient adhesion between the pultruded panels is avoided; in addition, the polyphosphonate also has an interface reinforcing effect, so that the strength of the pultruded plate is enhanced, and the strength of the girder structure is also increased.)

1. The application of polyphosphonate as demolding agent is characterized in that the polyphosphonate has the chemical structure:

wherein R1 and R2 are n-octadecyl and n is 2.

2. Use of polyphosphonate as a mould release agent according to claim 1, characterised in that the polyphosphonate is used as a mould release agent in the manufacture of pultruded panels.

3. A resin comprising the polyphosphonate of claim 1 or 2.

4. The resin according to claim 3, comprising the following components in parts by weight:

100 parts of epoxy resin;

60-100 parts of a curing agent;

0.5-3 parts of a catalyst;

0.2-2 parts of polyphosphonate.

5. The resin according to claim 4,

the epoxy resin is at least one of bisphenol A epoxy resin and bisphenol F epoxy resin;

the curing agent is at least one of liquefied methyl tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride, tetrahydrophthalic anhydride and phthalic anhydride;

the catalyst is 2, 4, 6-tri (dimethylaminomethyl) phenol or modified imidazole.

6. The resin according to any one of claims 3 to 5, further comprising,

0-50 parts of filler; and/or the presence of a gas in the gas,

0-20 parts of a toughening agent.

7. The resin according to claim 6,

the filler is at least one of calcium carbonate powder, aluminum hydroxide powder, argil powder and gas-phase silicon dioxide;

the toughening agent is at least one of carboxyl-terminated nitrile rubber, amino-terminated polyether, carboxyl-terminated polyether, epoxy-terminated polyether and long-chain polyether amine.

8. A pultruded panel, characterized in that a resin according to any of the claims 3-7 is used.

9. The pultruded panel according to claim 8, further comprising a fibrous reinforcement material, the fibrous reinforcement material having a volume content of 10-90% of the pultruded panel.

10. The pultruded panel according to claim 9, wherein said fibrous reinforcement material is at least one of glass fibers, carbon fibers, aramid fibers, polyester fibers.

Technical Field

The invention relates to the technical field of wind power blade manufacturing, in particular to application of polyphosphonate as a release agent, resin and a pultruded plate.

Background

In the wind power generation industry, a wind power blade generally takes a crossbeam as a main bearing structure. The girder is generally manufactured by using an infusion molding process, namely, firstly, a fiber material is laid on a mold, a vacuum bag and a flow guide net are arranged, liquid resin is infused after vacuum pressure maintaining, and demolding is carried out after curing. However, the profile of the girder is an irregular curved surface, wrinkles are easily generated in the laying process of the fiber material, so that local stress concentration is caused, the bearing capacity of the girder is greatly reduced, and the service life of the wind power blade is seriously influenced. In addition, the laying of the fibre material is greatly influenced by the manual work, thus increasing the severity of the fibre folds. Therefore, the traditional pouring process cannot meet the increasingly high requirements of girder manufacturing.

The pultrusion process can ensure that the fibers are straight and the tension is uniform, and simultaneously, the fiber content of the plate is higher, the quality is more stable and reliable, and the manufacturing of the crossbeam by adopting the pultrusion process is a trend. The method comprises the steps of firstly soaking fiber reinforced materials in liquid resin, curing the fiber reinforced materials after the fiber reinforced materials pass through a forming die to obtain pultruded plates, then combining the pultruded plates, placing the combined pultruded plates into a girder die or a blade skin die, and pouring resin into the die to obtain a girder structure through a vacuum pouring process. However, in the process of forming the pultruded panel, the pultruded panel has a large adhesion force with the forming mold, and in order to facilitate the extraction of the pultruded panel, an internal mold release agent is usually added into the liquid resin. The internal release agent is soluble with liquid resin and insoluble with solid resin, and can diffuse from resin matrix to solid resin surface during processing to form an isolating layer between the mold and the pultruded plate for demolding. However, the existence of the isolation layer is not beneficial to the effective bonding between the plates in the girder forming process, thereby causing adverse effect on the structural strength.

To solve the above problem, two methods are generally adopted: one method is to polish the surface of the pultruded plate after the pultruded plate is prepared so as to remove the release agent covering the surface, and the method ensures that the bonding strength between the plates in the girder forming process depends on the polishing effect of the pultruded plate, so the polishing effect needs to be checked, the process flow is increased, and meanwhile, the dust generated in the polishing process is not beneficial to environmental protection. The other method is to lay a layer of demoulding cloth in the preparation process of the pultruded plate to ensure that the surface of the plate does not have a layer of demoulding agent any more, and the demoulding cloth is torn off when the pultruded plate is manufactured into a girder structure. Whether the surface of the pultruded panel is covered with the release agent or not depends on the laying effect of the release cloth. According to the method, the demolding cloth needs to be paved and torn before and after the pultruded panel is prepared, so that the process flow is increased, meanwhile, the demolding cloth and the resin material in gaps of the demolding cloth are discarded, the manufacturing cost is increased, the burden is increased for garbage treatment, and the method is not beneficial to environmental protection.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the removal process of the release agent on the surface of the existing pultrusion plate is complex, so that the application of the polyphosphonate as the release agent, the resin and the pultrusion plate are provided.

Therefore, the invention provides an application of polyphosphonate as a release agent, wherein the polyphosphonate has a chemical structure as follows:

wherein R1 and R2 are n-octadecyl and n is 2.

Further, the polyphosphonate is used as a mold release agent in the manufacture of pultruded panels.

The invention also provides a resin comprising the polyphosphonate.

Further, the resin comprises the following components in parts by weight:

100 parts of epoxy resin;

60-100 parts of a curing agent;

0.5-3 parts of a catalyst;

0.2-2 parts of polyphosphonate.

Further, the epoxy resin is at least one of bisphenol A epoxy resin and bisphenol F epoxy resin;

the curing agent is at least one of liquefied methyl tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride, tetrahydrophthalic anhydride and phthalic anhydride;

the catalyst is 2, 4, 6-tri (dimethylaminomethyl) phenol or modified imidazole.

Further, the resin further includes:

0-50 parts of filler; and/or the presence of a gas in the gas,

0-20 parts of a toughening agent.

Further, the filler is at least one of calcium carbonate powder, aluminum hydroxide powder, clay powder and gas-phase silicon dioxide;

the toughening agent is at least one of carboxyl-terminated nitrile rubber, amino-terminated polyether, carboxyl-terminated polyether, epoxy-terminated polyether and long-chain polyether amine.

The invention also provides a pultruded panel, which adopts the resin.

Further, the pultruded panel further comprises a fiber reinforcement material, and the volume content of the fiber reinforcement material is 10-90% of that of the pultruded panel.

Further, the fiber reinforcement material is at least one of glass fiber, carbon fiber, aramid fiber, nylon fiber and polyester fiber.

The technical scheme of the invention has the following advantages:

the polyphosphonate can be dispersed in liquid resin in a molecular form, and can chemically react with a metal mold at the interface of the metal mold and the liquid resin to enable phosphate radicals to be chemically anchored on the metal mold, and n-octadecyl radicals face to one side far away from the metal mold; in the process of preparing the girder structure from the pultruded panel by the vacuum infusion method, the polyphosphonate monomolecular layer on the surface of the pultruded panel can be quickly dissolved and diffused in the infusion resin, so that a complete adhesion interface is formed between the infusion resin and the pultruded panel, and the adverse effect on the structural strength of the girder caused by insufficient adhesion between the pultruded panels is avoided; in addition, the polyphosphonate also has an interface reinforcing effect, so that the strength of the pultruded plate is enhanced, and the strength of the girder structure is also increased.

Detailed Description

The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.