CN110981222A - Glass fiber impregnating compound and preparation method and application thereof - Google Patents
Glass fiber impregnating compound and preparation method and application thereof Download PDFInfo
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- CN110981222A CN110981222A CN201911274389.8A CN201911274389A CN110981222A CN 110981222 A CN110981222 A CN 110981222A CN 201911274389 A CN201911274389 A CN 201911274389A CN 110981222 A CN110981222 A CN 110981222A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/465—Coatings containing composite materials
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/25—Non-macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/26—Macromolecular compounds or prepolymers
- C03C25/32—Macromolecular compounds or prepolymers obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C03C25/36—Epoxy resins
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/40—Organo-silicon compounds
Abstract
The invention belongs to the technical field of sizing agents, and discloses a glass fiber sizing agent and a preparation method and application thereof, wherein the sizing agent comprises a film forming agent, a coupling agent, a lubricant, a wetting agent and a pH regulator, the film forming agent comprises two bisphenol A epoxy resin emulsions with different epoxy equivalent weights, and compared with an epoxy resin emulsion with a single epoxy equivalent weight as the film forming agent, the film forming agent disclosed by the invention can ensure that the epoxy resin emulsion has enough coating force on the surface of a yarn, and can also ensure that the yarn has better flexibility, and the yarn still has lower stiffness even after being stored for a long time, so that the subsequent processing and mechanical strength of a composite material are facilitated.
Description
Technical Field
The invention relates to the technical field of impregnating compounds, in particular to a glass fiber impregnating compound and a preparation method and application thereof.
Background
Glass fiber is a reinforcing material, has various types, high heat resistance, high tensile strength, good insulativity and corrosion resistance, and is an inorganic non-metallic material with excellent performance. Compared with common glass fiber, the high-performance glass fiber has higher mechanical property, higher heat-resisting temperature, stronger corrosion resistance, better dielectric and electric insulation properties and the like, and is mainly used in the national defense fields of aviation, aerospace, weaponry, nuclear industry and the like. However, glass fibers also have disadvantages of high brittleness, low abrasion resistance, high susceptibility to static electrification after friction, and poor processability, and have poor adhesion to resins when used as reinforcing materials for resins, and therefore, it is necessary to perform surface modification treatment of glass fibers immediately after the drawing step with a glass fiber sizing agent.
The glass fiber sizing agent is a mixed system of various organic matters and inorganic matters and generally comprises a film forming agent, a coupling agent, a lubricating agent and the like. The film-forming agent is a key component of the sizing agent and also is a basis for determining the performance and classification of the sizing agent, and the film-forming agent has the largest dosage in the sizing agent, plays roles of bundling, bonding and the like on strands, and also determines the technological performance of the glass fibers during the molding of the fiber reinforced plastics. The existing film-forming agent mainly comprises polyvinyl acetate, polyester resin, epoxy resin, polyurethane and the like. For example, the prior art discloses a resin-compatible glass fiber impregnating compound, which takes a bisphenol a epoxy resin emulsion with an epoxy equivalent of 200-300 g/eq as a film-forming agent, and compared with an impregnating compound taking a water-soluble epoxy emulsion as a film-forming agent, the impregnating compound can prolong the effective period of a glass fiber product to a certain extent, but the yarn still has the problem of higher hardness along with the extension of storage time, which is very unfavorable for the subsequent processing and mechanical strength of a composite material; in addition, the impregnating compound selects bisphenol A epoxy resin emulsion with the epoxy equivalent of 200-300 g/eq as a film forming agent, so that a compact protective film is difficult to form on the surface of the glass fiber, and further microcracks caused by moisture entering the surface of the glass fiber in a high-temperature and high-humidity environment cannot be prevented, so that the performances of the yarn such as fatigue resistance and the like are reduced, and the wide application of the yarn is greatly limited.
Disclosure of Invention
Therefore, the invention aims to overcome the defects that the glass fiber product treated by the existing glass fiber impregnating compound has higher hardness after being stored for a long time and the performance is reduced due to the invasion of water molecules in a high-temperature and high-humidity environment, thereby providing the glass fiber impregnating compound; meanwhile, the invention also provides a preparation method and application of the glass fiber impregnating compound.
In order to solve the technical problems, the invention provides a glass fiber impregnating compound which is an aqueous solution with the content of effective components of 5-7 wt%, wherein the effective components comprise the following components in parts by weight:
1.5-7.1 parts of a film forming agent; 0.5-0.9 part of a coupling agent; 0.5-1.5 parts of a lubricant; 0.05-0.1 part of wetting agent; 0.1-0.5 part of pH regulator;
the film forming agent comprises epoxy resin emulsion with the average particle size of a dispersed phase of 0.15-0.25 mu m, and the epoxy resin emulsion comprises: 0.5-3 parts of first epoxy resin emulsion; 1-4 parts of a second epoxy resin emulsion; the first epoxy resin emulsion is a bisphenol A epoxy resin emulsion having an epoxy equivalent of 240 to 280, and the second epoxy resin emulsion is a bisphenol A epoxy resin emulsion having an epoxy equivalent of 170 to 220.
Further, the film forming agent also comprises water-soluble epoxy resin emulsion of which the weight is not more than 0.1 part.
Further, the coupling agent comprises an amino silane coupling agent.
Still further, the coupling agent further includes a vinyl-based silane coupling agent or a ureido-based silane coupling agent.
Further, the lubricant comprises: 0.5-1.2 parts of a nonionic lubricant; 0-0.3 part of cationic lubricant.
Still further, the nonionic lubricant is a silicone emulsion; the cationic lubricant is a long-chain polyhydrocarbylidene amine compound.
Further, the wetting agent is pentaerythritol.
Further, the pH regulator is an organic acid.
Further, the organic acid is acetic acid.
The invention also provides a preparation method of the glass fiber impregnating compound, which comprises the following steps:
(1) adding water into the pH regulator until the pH value of the solution is 3.0-6.0, then adding the coupling agent, and fully mixing until the coupling agent is uniformly dispersed to obtain a coupling agent solution;
(2) and fully dispersing other components except the pH regulator and the coupling agent in the formula of the impregnating compound in water, and uniformly mixing the components with the coupling agent solution to obtain the glass fiber impregnating compound.
The invention also provides the application of the glass fiber impregnating compound or the glass fiber impregnating compound prepared by the preparation method in the production of the twistless roving.
Further, drying the glass fiber strands in a temperature programming manner; the drying treatment comprises the steps of controlling the temperature of the first stage to be 85-95 ℃ for 80-100 min, controlling the temperature of the second stage to be 100-110 ℃ for 160-200 min, and controlling the temperature of the third stage to be 110-120 ℃ for 160-200 min.
The water in the invention mainly plays a role in dispersing all components in the impregnating compound, the mass of the effective components of the impregnating compound accounts for 5-7% of the total mass of the impregnating compound, the residual mass is the mass of the water, and the water in the invention is preferably deionized water.
The technical scheme of the invention has the following advantages:
1. the glass fiber sizing agent provided by the invention comprises a film forming agent, a coupling agent, a lubricating agent, a wetting agent and a pH regulator, wherein the film forming agent comprises two bisphenol A epoxy resin emulsions with different epoxy equivalents, and compared with the case that a single epoxy resin emulsion is used as the film forming agent, the film forming agent disclosed by the invention not only can ensure that the epoxy resin emulsion has enough covering force on the surface of yarns, but also can ensure that the yarns have better flexibility, and the yarns still have lower stiffness even after being stored for a long time, so that the subsequent processing and the mechanical strength of a composite material are facilitated. Meanwhile, the film forming agent also comprises water-soluble epoxy resin emulsion, and is used for improving the viscosity of a system, reducing the excessive looseness of yarns caused by the softness of the yarns, and improving the winding performance and the wear resistance of the yarns. The film-forming agent is prepared by matching bisphenol A epoxy resin emulsion and water-based epoxy emulsion with different equivalent weights, not only gives consideration to the bundling property and flexibility of glass fiber yarns, but also can meet the feasibility of fiber production, can avoid the generation of hairiness, hairline and the like, and is favorable for improving the comprehensive performance of glass fiber products. In addition, the specific film forming agent is matched with the coupling agent for use, so that the yarn has better humidity resistance and heat resistance, and still has good strength retention rate under the high-temperature and high-humidity environment.
2. The glass fiber sizing agent provided by the invention is a silane coupling agent, and has a reaction group capable of being chemically combined with inorganic materials (such as glass, silica sand, metal and the like) and a reaction group capable of being chemically combined with organic materials (such as synthetic resin and the like) in molecules, so that the glass fiber sizing agent has a coupling effect with glass fiber and matrix resin.
3. The glass fiber impregnating compound provided by the invention has the advantages that the lubricants comprise nonionic lubricants and cationic lubricants, so that the glass fibers are fully lubricated in the wire drawing and winding processes, the abrasion of the glass fibers in the processing process is reduced, the generation of hairiness is avoided, and the fatigue resistance of glass fiber products is favorably improved. The non-ionic lubricant is organic silicon emulsion, can reduce the contact angle between an impregnating compound system and the surface of the glass fiber and can play a role in wetting while playing a role in lubricating.
4. According to the glass fiber impregnating compound provided by the invention, the wetting agent is pentaerythritol which is low-molecular-weight crystalline polyol, so that the contact between glass fibers and thermosetting resin is promoted, and the permeability of the glass fibers is greatly improved.
5. According to the preparation method of the glass fiber impregnating compound, provided by the invention, the silane coupling agent is hydrolyzed firstly, and then is mixed with the components such as the film forming agent, the lubricant and the like which are fully dispersed in the dehydrated water, the preparation process is simple and easy to implement, no special requirements are required on equipment performance and operators, the solvent is deionized water, no secondary pollution is caused, and the preparation method is beneficial to large-scale batch production.
6. According to the application of the glass fiber impregnating compound provided by the invention, the glass fiber protofilament is subjected to three-section drying treatment before the subsequent processing procedure, so that the film-forming agent is favorably spread on the surface of the glass fiber, and the wear resistance of a glass fiber product is improved.
Compared with the prior art, the sizing agent disclosed by the invention endows the glass fiber with better processing performance, is good in compatibility with thermosetting resins such as epoxy resin, polyester resin or vinyl resin, improves the mechanical property of the yarn, improves the performance retention of the yarn in a high-temperature and high-humidity environment, reduces the chromatic aberration of the yarn and greatly prolongs the storage time of the yarn.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a graph showing the tendency of yarn stiffness to change when a glass fiber yarn treated with a glass fiber sizing agent of example 1 of the present invention is stored at room temperature for 18 months.
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.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
In the following examples, epoxy resin emulsion 681 is a water-soluble epoxy resin emulsion provided by Middle science and technology Co., Ltd, A-174 is γ - (methacryloyloxy) propyltrimethoxysilane, A-187 is γ -glycidyloxypropyltrimethoxysilane, A-1100 is γ -aminopropyltriethoxysilane, A-1120 is N- β (aminoethyl) - γ -aminopropyltrimethoxysilane, A-1524 is ureidopropyltrimethoxysilane, Z-6132 is vinylbenzylamine silane, organosilicon 1240 is a nonionic lubricant provided by Middle science and technology Co., Ltd, NBR-1160 is a cationic lubricant and produced by Middle science and technology Co., Ltd.
The chemical components of the glass fiber sizing agents of examples 1 to 5 are shown in table 1 below, wherein the amounts of the components in the glass fiber sizing agent formula are the amounts of the corresponding active ingredients, and the amounts of auxiliary ingredients such as solvents are not included.
TABLE 1 glass fiber sizing formulation tables for examples 1-5
The first epoxy resin emulsion is obtained by emulsifying bisphenol A epoxy resin with the epoxy equivalent of 240-280 by a surfactant, the second epoxy resin emulsion is obtained by emulsifying bisphenol A epoxy resin with the epoxy equivalent of 170-220 by a surfactant, the surfactant can be a nonionic surfactant such as Pasteur Pluronic P103, Pluronic F77, Pluronic L101, Pluronic P105 and the like, the dosage of the surfactant is 8-25% of the mass of the bisphenol A epoxy resin, and is preferably 10-18%, and the epoxy resin emulsion of the embodiments 1-6 is prepared by the following method: pre-melting bisphenol A type epoxy resin and a surfactant Pluronic L101 at 80 ℃ for 3h respectively, transferring into an emulsifier, starting the emulsifier, stirring to uniformly mix the materials, switching on jacket condensed water, controlling the temperature to be 45 +/-2 ℃, adding water for emulsification until the emulsion is converted from W/O type emulsion into O/W type emulsion, continuing stirring for 10min, controlling the temperature to be 38 +/-2 ℃, and continuing adding water for stirring until uniform O/W type emulsion is formed, thus obtaining the bisphenol A type epoxy resin emulsion.
The preparation method specifically comprises the following steps:
(1) adding acetic acid into the first mixing container, adding deionized water while stirring until the pH value of the solution is 3.0-6.0, adding the silane coupling agent while stirring, and continuously stirring until the surface of the solution is clear to obtain a silane coupling agent solution;
(2) adding the first epoxy resin emulsion into a second mixing container, adding deionized water 5 times the mass of the first epoxy resin emulsion while stirring, then adding the second epoxy resin emulsion, and adding deionized water 5 times the mass of the second epoxy resin emulsion while stirring to obtain diluted epoxy resin emulsion;
(3) fully diluting epoxy resin emulsion 681 with deionized water 5 times of the weight of the epoxy resin emulsion 681, adding the diluted epoxy resin emulsion 681 into a second mixing container, and uniformly stirring;
(4) fully diluting organic silicon 1240, NBR-1160 and pentaerythritol with deionized water 10 times of the weight of the organic silicon, adding the diluted organic silicon, NBR-1160 and pentaerythritol into a second mixing container, and uniformly stirring;
(6) and adding the silane coupling agent solution in the first mixing container into a second mixing container, uniformly stirring, and adding the rest deionized water to obtain the glass fiber impregnating compound.
Comparative example 1
The comparative example provides a glass fiber sizing agent, the effective components of which consist of the following components: 6.15kg of epoxy resin emulsion; a-11001.605 kg; NBR-11401.607 kg; NBR-11600.157 kg; 0.481kg of citric acid. Wherein the epoxy resin emulsion is obtained by emulsifying bisphenol A epoxy resin with the epoxy equivalent of 230-270 g/eq.
The preparation method specifically comprises the following steps:
(1) adding citric acid into the first mixing container, adding deionized water while stirring until the pH value of the solution is 3.0-6.0, adding the silane coupling agent A-1100 while stirring, and continuously stirring until the surface of the solution is clear to obtain a silane coupling agent solution;
(2) adding the epoxy resin emulsion into a second mixing container, and adding deionized water with 5 times of the mass of the epoxy resin emulsion while stirring to obtain diluted epoxy resin emulsion;
(4) fully diluting NBR-1140 and NBR-1160 respectively with deionized water of which the mass is 10 times that of the NBR-1140 and NBR-1160, adding the diluted materials into a second mixing container, and uniformly stirring the materials;
(5) and adding the silane coupling agent solution in the first mixing container into a second mixing container, uniformly stirring, and adding the rest deionized water to obtain the glass fiber impregnating compound.
Comparative example 2
The comparative example provides a glass fiber sizing agent which is specifically composed of the following components:
3kg of first epoxy resin emulsion; 1kg of second epoxy resin emulsion; 6810.1kg of epoxy resin emulsion; a-1740.4 kg; a-11200.5 kg; 12401.2 kg of organic silicon; NBR-11600.3 kg; 0.1kg of pentaerythritol; 0.45kg of acetic acid; the content of effective components is 5.7%.
The preparation method specifically comprises the following steps:
(1) adding acetic acid into the first mixing container, adding deionized water while stirring until the pH value of the solution is 3.0-6.0, adding silane coupling agents A-1120 and A-174 while stirring, and continuously stirring until the surface of the solution is clear to obtain a silane coupling agent solution;
(2) adding the first epoxy resin emulsion into a second mixing container, adding deionized water 5 times the mass of the first epoxy resin emulsion while stirring, then adding the second epoxy resin emulsion, and adding deionized water 5 times the mass of the second epoxy resin emulsion while stirring to obtain diluted epoxy resin emulsion;
(3) fully diluting epoxy resin emulsion 681 with deionized water 5 times of the weight of the epoxy resin emulsion 681, adding the diluted epoxy resin emulsion 681 into a second mixing container, and uniformly stirring;
(4) fully diluting organic silicon 1240, NBR-1160 and pentaerythritol with deionized water 10 times of the weight of the organic silicon, adding the diluted organic silicon, NBR-1160 and pentaerythritol into a second mixing container, and uniformly stirring;
(6) and adding the silane coupling agent solution in the first mixing container into a second mixing container, uniformly stirring, and adding the rest deionized water to obtain the glass fiber impregnating compound.
Performance testing
Applying different glass fiber impregnating compounds to high-performance glass fiber roving, and performing various performance tests, wherein glass fiber precursors are dried by an oven before subsequent processing, and the drying is divided into three stages, namely 80-90 ℃ and 80-100 min; 100-110 ℃ for 80-100 min; 115-125 ℃ for 210-270 min. The glass fiber yarn obtained by the treatment of the glass fiber sizing agent of example 1 was examined for its yarn stiffness after 18 months of storage at room temperature, and then a graph showing the change of the yarn stiffness with time was prepared based on the results, as shown in fig. 1. The test methods for different products are as follows:
(1) combustible content: test method part 2 of reinforced articles according to GB/T9914.2: measuring combustible content of the glass fiber;
(2) dry yarn tensile strength: according to GB/T7690.3 reinforcing material yarn test method part 3: measuring breaking strength and breaking elongation of the glass fiber;
(3) and (3) testing the linear density: GB/T7690.1-2001 reinforcement yarn test method part 1: measuring the linear density;
(4) tensile strength and modulus of the dipped yarn: preparing a glass fiber untwisted roving dipped yarn sample and measuring the tensile strength by comparing with ASTM D2343 (GB/T20130-2006);
(5) fatigue strength under extreme conditions: the test specimens were subjected to successive tests at the specified load levels until the specified number of cycles was reached or the test specimens failed. Testing by adopting a lifting method, wherein 15 effective samples are obtained, the stress ratio is 0.05263, the loading waveform is a sine wave, and the loading frequency is 8 Hz;
(6) amount of hairiness: the method comprises the steps that all hairline weights generated by the twistless roving and a wear-resistant device in the friction period are in milligrams, the twistless roving and the wear-resistant device are rubbed by adopting multiple points, multiple friction materials and multiple friction angles, a sample is damaged at a constant winding speed, and the amount of collected hairline is measured after the process is finished;
(7) NOL Ring Dry/Wet: making and testing a Noll ring by comparing the glass fiber untwisted roving with ASTM D2344;
(8) contact angle of HS6 bare fiber with resin: the test was carried out by the william plate method using a DCAT21 surface tension meter manufactured by Dataphysics, germany;
(9) the method for testing the stiffness comprises the following steps: the stiffness of the untwisted roving is tested by using the national standard GB/T7690.4-2001.
(10) The roving was placed horizontally on a support with a spacing of 10m and a certain degree of tension (0.098N/Tex) was applied, referring to GB18369, appendix B, and the difference between the maximum and minimum sag of the glass fiber strand was taken as the sag of the roving, which is called the natural sag height when the tension is 0.
The results of each performance test are shown in table 2 below.
TABLE 2 glass fiber sizing agent application Properties of different formulations
As can be seen from the data in the above table 2, the sizing agent of the present invention not only improves the mechanical properties of the yarn and enhances the performance retention of the yarn in a high temperature and high humidity environment, but also greatly prolongs the storage time of the yarn.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The glass fiber impregnating compound is an aqueous solution with 5-7 wt% of effective components, and is characterized in that the effective components comprise the following components in parts by weight:
1.5-7.1 parts of a film forming agent; 0.5-0.9 part of a coupling agent; 0.5-1.5 parts of a lubricant; 0.05-0.1 part of wetting agent; 0.1-0.5 part of pH regulator;
the film forming agent comprises epoxy resin emulsion with the average particle size of a dispersed phase of 0.15-0.25 mu m, and the epoxy resin emulsion comprises: 0.5-3 parts of first epoxy resin emulsion; 1-4 parts of a second epoxy resin emulsion; the first epoxy resin emulsion is a bisphenol A epoxy resin emulsion having an epoxy equivalent of 240 to 280, and the second epoxy resin emulsion is a bisphenol A epoxy resin emulsion having an epoxy equivalent of 170 to 220.
2. The glass fiber sizing agent according to claim 1 or 2, wherein said film-forming agent further comprises not more than 0.1 parts of a water-soluble epoxy resin emulsion.
3. A glass fiber sizing agent according to claim 1 or 2, wherein said coupling agent comprises an amino silane coupling agent.
4. A glass fiber sizing agent according to claim 3, wherein said coupling agent further comprises a vinyl-based silane coupling agent or a ureido-based silane coupling agent.
5. A glass fiber size according to any one of claims 1-4, wherein said lubricant comprises: 0.5-1.2 parts of a nonionic lubricant; 0-0.3 part of cationic lubricant.
6. The glass fiber sizing agent according to claim 5, wherein said non-ionic lubricant is a silicone emulsion; the cationic lubricant is a long-chain polyhydrocarbylidene amine compound.
7. A glass fiber sizing composition according to any one of claims 1 to 6, wherein said wetting agent is pentaerythritol; the pH regulator is organic acid.
8. A method for preparing a glass fiber sizing agent according to any one of claims 1 to 7, characterized by comprising the steps of:
(1) adding water into the pH regulator until the pH value of the solution is 3.0-6.0, then adding the coupling agent, and fully mixing until the coupling agent is uniformly dispersed to obtain a coupling agent solution;
(2) and fully dispersing other components except the pH regulator and the coupling agent in the formula of the impregnating compound in water, and uniformly mixing the components with the coupling agent solution to obtain the glass fiber impregnating compound.
9. Use of a glass fibre size according to any one of claims 1 to 7 or obtained by the method according to claim 8 for the production of roving.
10. The use according to claim 9, characterized in that the glass fiber strands are dried by means of a programmed temperature increase; the drying treatment comprises the steps of controlling the temperature of the first stage to be 85-95 ℃ for 80-100 min, controlling the temperature of the second stage to be 100-110 ℃ for 160-200 min, and controlling the temperature of the third stage to be 110-120 ℃ for 160-200 min.
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