阅读说明：本技术 玻璃纤维浸润剂及其应用 (Glass fiber impregnating compound and application thereof ) 是由 杨国明 钱宇卿 章建忠 樊家澍 严忠平 张志坚 于 2021-10-29 设计创作，主要内容包括：本发明提供了一种玻璃纤维浸润剂及其应用。玻璃纤维浸润剂,其玻璃纤维浸润剂包括水和功能组分,功能组分包括以下成分,各成分质量占玻璃纤维浸润剂中除水以外总质量的百分比表示如下：偶联剂10～20％；成膜剂A35～50％；成膜剂B15～30％；润滑剂5～10％；分散剂2～12％；抗氧剂3～8％；其中,成膜剂A为聚丙烯乳液,成膜剂B为聚醚类乳液,润滑剂为硅油。将该浸润剂使用玻璃纤维浸渍后用于连续纤维增强热塑性塑料,尤其是CFRT工艺增强PP,能够明显改善其热氧老化问题。与此同时,该浸润剂形成的玻璃纤维预浸料毛羽少,工艺顺畅性好,且连续纤维增强热塑性塑料也满足机械强度要求。(The invention provides a glass fiber impregnating compound and application thereof. The glass fiber impregnating compound comprises water and functional components, wherein the functional components comprise the following components in percentage by mass of the total mass of the glass fiber impregnating compound except water: 10-20% of a coupling agent; film forming agent A35-50%; film-forming agent B15-30%; 5-10% of a lubricant; 2-12% of a dispersant; 3-8% of an antioxidant; wherein the film forming agent A is polypropylene emulsion, the film forming agent B is polyether emulsion, and the lubricant is silicone oil. The impregnating compound is used for continuous fiber reinforced thermoplastic plastics after being impregnated by glass fibers, particularly for PP reinforced by a CFRT (carbon fiber reinforced polymer) process, and the problem of thermal oxidation aging can be obviously improved. Meanwhile, the glass fiber prepreg formed by the impregnating compound has less hairiness and good process smoothness, and the continuous fiber reinforced thermoplastic plastic also meets the requirement of mechanical strength.)

1. The glass fiber impregnating compound is characterized by comprising water and functional components, wherein the functional components comprise the following components in percentage by mass based on the total mass of the glass fiber impregnating compound except water:

the film forming agent A is polypropylene emulsion, the film forming agent B is polyether emulsion, and the lubricant is silicone oil.

2. The glass fiber sizing agent according to claim 1, wherein said functional components comprise the following components, and the mass percentages of the components in the glass fiber sizing agent excluding water are expressed as follows:

3. the glass fiber sizing agent according to claim 1, wherein said functional components comprise the following components, and the mass percentages of the components in the glass fiber sizing agent excluding water are expressed as follows:

4. the glass fiber impregnating compound according to claim 3, wherein the weight ratio of the effective components of the film forming agent A and the film forming agent B is 1.6-2.0: 1.

5. A glass fiber sizing according to any one of claims 1 to 4, wherein said coupling agent is a silane coupling agent.

6. The glass fiber sizing agent according to any one of claims 1 to 4, wherein the film-forming agent A is a maleic anhydride-modified polypropylene emulsion; in the maleic anhydride modified polypropylene emulsion, the grafting rate of maleic anhydride is at least 2%; the film forming agent B is modified polyether polyurethane emulsion; the dispersing agent is modified polysiloxane emulsion; the antioxidant is hindered phenol antioxidant.

7. The glass fiber sizing agent according to claim 6, wherein in the maleic anhydride-modified polypropylene emulsion, the particle size of emulsion particles is 0.1 to 4.0 μm, the melting point Tm of the polymer is 140 to 160 ℃, and the weight-average molecular weight is 1 to 3 ten thousand.

8. A glass fiber product, which is characterized by comprising glass fibers and a coating layer which is coated by a sizing agent and compounded on the surfaces of the glass fibers after being cured, wherein the sizing agent is the glass fiber sizing agent as defined in any one of claims 1 to 7.

9. A continuous fiber reinforced thermoplastic formed by compounding the glass fiber product of claim 8 with a thermoplastic substrate.

10. The continuous fiber reinforced thermoplastic of claim 9, wherein the thermoplastic substrate is polypropylene.

Technical Field

The invention relates to the technical field of glass fiber production and manufacturing, in particular to a glass fiber impregnating compound and application thereof.

Background

Continuous Fiber Reinforced Thermoplastics (CFRT) are generally molded into unidirectional prepregs by an extrusion process and then formed into composite structures by other molding methods, such as molding, pultrusion, or winding processes. The prepreg is an intermediate material formed by impregnating fibers or fabrics with a controlled amount of resin (thermosetting or thermoplastic), has a stable and consistent fiber/resin composite effect, and can completely permeate the fibers, thereby ensuring superior mechanical strength. CFRT prepreg formation techniques generally include solution impregnation, melt coating, powder impregnation, and the like.

The development of continuous fiber reinforced thermoplastic materials is a necessary trend of future development of thermoplastic reinforced materials, and compared with continuous fiber reinforced thermosetting plastics, the continuous fiber reinforced thermosetting plastics have the following outstanding advantages: (1) the prepreg can be stored for a long time; (2) the comprehensive performance is excellent, and particularly, the mechanical property can be kept well under high temperature and high humidity; (3) the forming mode has wide adaptability and high production efficiency; (4) the product can be repeatedly processed and recycled and has certain repairability. In recent years, Continuous Fiber Reinforced Thermoplastics (CFRT) have been receiving increasing attention from all countries around the world, and research and applications have been active. The application fields of the composite material are mainly concentrated in the fields of spaceflight, aviation, automobiles, building materials, chemical engineering, electronics/electrical appliances and the like.

With the increasing progress of scientific technology, the novel CFRT sheet is used in wider fields, especially in the case material with higher requirements on structural strength, and the requirements on thermal-oxidative aging resistance are particularly high due to the main use in the transportation field. Polypropylene is excellent polyolefin, has good thermal stability under the anaerobic condition, is not easy to degrade, but is very sensitive to heat and oxygen due to the tertiary carbon atoms, is easy to oxidize and degrade, so that the mechanical property is reduced, and the original use value is lost. Therefore, the research on the interface combination aspect of the glass fiber surface treating agent improves the thermal oxidation aging resistance of the material, has positive significance for guiding the application of the CFRT-PP sheet, has higher and higher lightweight requirement at present, obviously increases the consumption of the CFRT sheet, and pre-estimates that the newly increased global demand can reach 4 ten thousand tons, so that the development of the novel thermal oxidation aging resistant glass fiber for the CFRT has good strategic significance.

Disclosure of Invention

The invention mainly aims to provide a glass fiber impregnating compound and application thereof, so as to solve the problem of thermal oxidation aging resistance of continuous fiber reinforced thermoplastic plastics in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a glass fiber sizing agent, wherein the glass fiber sizing agent comprises water and functional components, the functional components comprise the following components, and the mass percentages of the components in the glass fiber sizing agent in total mass except water are as follows:

wherein the film forming agent A is polypropylene emulsion, the film forming agent B is polyether emulsion, and the lubricant is silicone oil.

Further, the functional components comprise the following components, and the mass percentage of each component in the total mass of the glass fiber sizing agent except water is as follows: :

further, the functional components comprise the following components, and the mass percentage of each component in the total mass of the glass fiber sizing agent except water is as follows: :

further, the weight ratio of the effective components of the film forming agent A to the film forming agent B is 1.6-2.0: 1.

Further, the coupling agent is a silane coupling agent.

Further, the film forming agent A is maleic anhydride modified polypropylene emulsion, and the grafting rate of maleic anhydride is at least 2%; the film forming agent B is modified polyether polyurethane emulsion; the dispersing agent is modified polysiloxane emulsion; the antioxidant is hindered phenol antioxidant.

Furthermore, in the maleic anhydride modified polypropylene emulsion, the particle size of emulsion particles is 0.1-4.0 mu m, the melting point Tm of the polymer is 140-160 ℃, and the weight average molecular weight is 1-3 ten thousand.

According to another aspect of the present invention, there is also provided a glass fiber product, which includes glass fibers and a coating layer coated with a sizing agent and compounded on the surfaces of the glass fibers after curing, wherein the sizing agent is the glass fiber sizing agent.

According to another aspect of the present invention, there is also provided a continuous fiber reinforced thermoplastic, characterized by being formed by compounding the above glass fiber product with a thermoplastic substrate.

Further, the thermoplastic substrate is polypropylene.

The invention provides a glass fiber impregnating compound which can be used as an impregnating compound for a CFRT (carbon fiber reinforced polymer) process reinforced PP (polypropylene) glass fiber direct yarn. The glass fiber coated by the impregnating compound is used for continuous fiber reinforced thermoplastic plastics, especially for PP reinforced by CFRT process, and can obviously improve the thermal oxidation aging problem. Meanwhile, the impregnating compound is used for coating glass fibers, so that the produced glass fiber prepreg has less hairiness and good process smoothness in the using process, and the finally formed continuous fiber reinforced thermoplastic plastic also meets the requirement of mechanical strength.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.

Herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

As described in the background section, the continuous fiber reinforced thermoplastics of the prior art, and in particular the continuous fiber reinforced polypropylene materials, have the problem of insufficient thermal oxygen aging.

In order to solve the problems, the invention provides a glass fiber impregnating compound which is characterized by comprising the following components in percentage by mass of the total mass of the glass fiber impregnating compound except water:

wherein the film forming agent A is polypropylene emulsion, the film forming agent B is polyether emulsion, and the lubricant is silicone oil.

The coupling agent is a substance with two functional groups with different properties, and the molecular structure of the coupling agent is mainly characterized in that the molecule contains two groups with different chemical properties, one group is an inorganophilic group and is easy to chemically react with an inorganic substance; the other is an organophilic group which can chemically react with synthetic resins or other polymers or form hydrogen bonds which are dissolved in the synthetic resins or other polymers, so that the coupling agent is called a "molecular bridge" and is used for improving the interface action between inorganic matters and organic matters, thereby greatly improving the performance of the composite material. The film-forming agent is used as the main component of the sizing agent, plays a role in protecting the glass fiber and plays a decisive role in the mechanical strength of the final product of the glass fiber.

The invention simultaneously adopts the polypropylene emulsion and the polyether emulsion as the film forming agent A and the film forming agent B respectively, has obvious effect on the combination property of the glass fiber and the polymer or the synthetic resin, can obviously improve the interface combination capability of the glass fiber, has better apparent property of the glass fiber, and correspondingly improves the thermo-oxidative aging resistance of the glass fiber. Meanwhile, the use of the polyether emulsion can also ensure that the glass fiber has good wear resistance in consideration of the special process characteristics of CFRT, thereby avoiding the problem of insufficient smoothness caused by abrasion in the subsequent processing and production process.

The lubricant is used as a lubricating medium, can effectively reduce the frictional resistance and slow down the abrasion of the glass fiber in the production and use processes, and particularly can effectively improve the abrasion resistance of the glass fiber, reduce hairiness in the use process and improve the process smoothness. According to the invention, the silicone oil is selected as the lubricant, on one hand, compared with other lubricants such as PEG, straight-chain aliphatic hydrocarbon compounds, amides and the like, the silicone oil has better matching property with the film forming agent A and the film forming agent B; on the other hand, the silicone oil is applied to the impregnation system of the invention, which is also beneficial to reducing the migration of the silicone oil in a coating layer formed after the glass fiber is impregnated, and meanwhile, the yellowing resistance of the glass fiber is better. In addition, the silicone oil plays a role in dry-based lubrication, and the content of the silicone oil is controlled within the range, so that the wear resistance of the glass fiber is improved, hairiness can be effectively reduced, the lubricating effect of the glass fiber in the processes of wire drawing, post-treatment and use can be met, the bonding effect among strands can not be influenced, and the mechanical property of the final material can not be influenced.

The proportion of the coupling agent, the film forming agent A, the film forming agent B and the lubricant is controlled within the range, the functions are better exerted, and then a dispersant and an antioxidant with special content are added in an auxiliary manner, so that the formed impregnating compound can be used as the impregnating compound of the glass fiber direct yarn for the CFRT process reinforced PP with thermal oxidation aging resistance. The impregnating compound is used for impregnating glass fibers and then used for continuous fiber reinforced thermoplastic plastics, particularly for reinforcing PP (polypropylene) by a CFRT (carbon fiber reinforced reverse transcription) process, and the problem of thermal-oxidative aging can be obviously improved. Meanwhile, the impregnating compound is used for coating glass fibers, so that formed glass fiber yarns have less hairiness, the process smoothness is good in the using process, and finally formed continuous fiber reinforced thermoplastic plastics can meet the requirement on mechanical strength.

The glass fiber sizing agent comprises water and functional components, wherein the content ratio of the functional components refers to the percentage of the effective content of the glass fiber sizing agent in weight except water. The effective component content of the functional component refers to the weight of the functional component except water, the effective component refers to the component except water, for example, the weight percentage of the polypropylene emulsion is 35-50%, the mass of the emulsion after the mass of the water is subtracted is recorded as the effective component content, and the effective component content is calculated according to the percentage of the effective component content in the weight of the glass fiber impregnating compound except water. It will be understood by those skilled in the art that no further description is provided herein.

In a preferred embodiment, the functional components comprise the following components, and the mass percentage of each component in the glass fiber sizing agent except water is expressed as follows: :

in a preferred embodiment, the functional components comprise the following components, and the mass percentage of each component in the glass fiber sizing agent except water is expressed as follows: :

in consideration of balancing the comprehensive performance of the glass fiber, the combination ability with the matrix resin and the processing and using process characteristics are better satisfied, in a preferred embodiment, the sum of the weight percentages of the film-forming agent A and the film-forming agent B in the impregnating compound except water is 50-80%, preferably 55-73%, more preferably 59-69%, and further preferably 62-66%. Wherein the weight ratio of the effective components of the film forming agent A to the effective components of the film forming agent B is preferably 1.6-2.0: 1. The proportion of the two is controlled in the range, so that the composite material has better promotion effect on comprehensively improving the bonding performance, the wear resistance, the processing performance and the like of the glass fiber, and the final CFRT reinforced material has better thermal-oxidative aging resistance and mechanical performance.

In a preferred embodiment, the coupling agent is a silane coupling agent, preferably a vinyl silane coupling agent. The vinyl silane coupling agent has a vinyl functional group containing an unsaturated double bond structure and three hydrolyzable methoxyl groups in a molecular structure, has good stability in a water-based system, is not easy to volatilize, can generate a coupling reaction on free radicals on the surface of glass fiber, and improves the mechanical property of a resin-based composite material, particularly the vinyl functional group in the molecular structure can react with nonpolar matrix resin to generate an interface layer and transfer stress, so that the bonding strength of a resin coating is improved, and the special properties of the resin coating, such as thermal oxidation aging resistance, are further improved. More preferably, it is one or more of silane coupling agent A-171 of Meiji corporation, Z-6300 of Dow Corning, KBM-1003 of Japan shin. The weight of the coupling agent in the invention is 10-20%, preferably 12-18%, more preferably 13-17%, and even more preferably 15-16% of the weight of the impregnating compound except water.

In order to further improve the bonding force between the infiltrated glass fiber and the resin, in a preferred embodiment, the film forming agent A is maleic anhydride modified polypropylene emulsion; preferably, the maleic anhydride grafting rate in the maleic anhydride modified polypropylene emulsion is at least 2%. By adopting the film forming agent A, according to a similar compatibility principle, a product formed by soaking and curing the glass fiber has better bonding performance with a resin base material, and the thermal oxidation aging resistance of the CFRT reinforced material is further improved. In addition, in order to make the impregnating compound more stable and improve the impregnating uniformity, more preferably, in the maleic anhydride modified polypropylene emulsion, the particle size of emulsion particles is 0.1-4.0 μm, the melting point Tm of a polymer is 140-160 ℃, and the weight-average molecular weight is 1-3 ten thousand; further preferably, the film forming agent A is a polypropylene wax emulsion of model TX 170B.

In a preferred embodiment, the film forming agent B is a modified polyether polyurethane emulsion. In general polyurethane emulsion, the urethane group is easy to decompose to generate amine, especially the aromatic amine is oxidized to generate quinone chromophore, so that yellow silk and hard strips appear on the end face of a glass fiber yarn group, and the product quality is influenced. The modified polyether polyurethane emulsion has aliphatic urethane bond more stable than aromatic urethane bond of common polyurethane emulsion, and even decomposing into aliphatic amine, the emulsion is not easy to discolor like aromatic amine. In a word, the modified polyether polyurethane emulsion is preferably adopted in the invention, which is not only beneficial to improving the bonding performance of the glass fiber, but also beneficial to smooth subsequent processing. Preferably, the film forming agent B is a modified polyether polyurethane emulsion of the type VONDIC 1970 NE.

The dispersant used in the present invention is preferably a water-soluble organic polymer emulsion compound, and the dispersant is selected from modified silicone emulsions in consideration of the use characteristics of the glass fiber sizing agent and the requirements for high surface quality of CFRT reinforcing materials, particularly sheets. The dispersant is often used in combination with a silane coupling agent, and has lubricating and wetting effects. As a non-coupling agent silane, the modified polysiloxane emulsion can greatly reduce the dispersion viscosity of the film forming agent. Due to good wetting and dispersing properties, under a certain viscosity requirement, the modified polysiloxane emulsion can be used in an aqueous phase system to greatly improve the dispersibility of the glass fiber surface treating agent, so that on one hand, the surface gloss of a processing material can be correspondingly improved, on the other hand, the bonding strength of the effective components of the impregnating compound and the glass fibers can be improved, the surface compactness of a glass fiber product is better, and the thermal oxidation aging resistance of the CFRT reinforced material, especially a sheet material, can be further improved. More preferably, the dispersant is a modified silicone emulsion of type HANSA SP 1050. The dispersant accounts for 2-12% of the weight of the impregnating compound except water, preferably 4-10%, more preferably 5-8%, and most preferably 6-7%.

The silicone oil is selected as a lubricant, and accounts for 5-10%, more preferably 7-9% and even more preferably 8-9% of the weight of the impregnating compound except water. Silicone oil lubricants include, but are not limited to Dow Corning PMX-200 and/or Kekeka stanxtex G7607.

The impregnating compound adopts polypropylene emulsion and polyether emulsion, which are easy to cause the problem of oxidative yellowing in the baking process, and yarns for the CFRT process require good color stability of yarns so as to avoid the problem of quality caused by appearance influence due to uneven yellow spots or yellow stripes in sheet parts, so that the problem is improved by adopting an antioxidant in the impregnating compound. In a preferred embodiment, the antioxidant is a hindered phenolic antioxidant. The hindered phenol antioxidant is more matched with the polypropylene emulsion and the polyether emulsion, and can better prevent the glass fiber yarn from oxidative yellowing in the baking process. Meanwhile, the hindered phenol antioxidant has good chain termination performance, and effectively slows down the autoxidation speed of the high polymer material, so that the stability of the impregnating compound can be improved to a certain extent, and the improvement effect is more obvious particularly in the aspect of thermal oxidation aging. In order to improve the stability of the sizing agent and the compatibility among the components, the antioxidant is preferably a hindered phenol emulsion antioxidant, and more preferably an antioxidant of type H10. The antioxidant in the invention accounts for 3-8% of the impregnating compound except water, preferably 4-8%, more preferably 5-7%, and most preferably 5-6%.

In a preferred embodiment, the glass fiber sizing agent has a solid content of 5 to 12% by weight. The preparation method has the advantages that the viscosity of the impregnating compound is more suitable, and the stability and controllability of the impregnating process are improved.

The preparation method of the impregnating compound comprises the following steps: hydrolyzing a coupling agent in deionized water in advance to obtain a hydrolysate; dispersing a dispersing agent in deionized water to form a dispersion liquid; mixing the film forming agent A and the film forming agent B, diluting with deionized water and stirring to obtain a film forming agent mixed solution; mixing the film forming agent mixed solution with the dispersion solution, mixing with the hydrolysate, and adding the lubricant, wherein the lubricant can be diluted by deionized water in advance. And diluting the antioxidant with deionized water, adding the diluted antioxidant into the mixed solution, finally complementing the deionized water, and fully stirring to obtain the impregnating compound.

In a specific embodiment, the preparation method of the impregnating compound comprises the following steps: adding a coupling agent which is hydrolyzed by deionized water at room temperature of 20-30 times for 30-50 minutes in advance into a container; adding a dispersing agent into deionized water at 50-60 ℃, uniformly stirring, adding a mixture of a film forming agent A emulsion and a film forming agent B emulsion which are respectively diluted by deionized water at 2 times of room temperature, continuously uniformly stirring, and adding into the prepared coupling agent solution; and then adding a lubricant which is diluted and dissolved by 10-20 times of room temperature deionized water, finally adding an antioxidant which is diluted by 60-70 ℃ deionized water, supplementing the weight of the impregnating compound to a set value by using the room temperature deionized water, and fully stirring for 20-40 minutes to obtain the impregnating compound.

According to another aspect of the present invention, there is also provided a glass fiber product, which includes glass fibers and a coating layer coated with a sizing agent and compounded on the surfaces of the glass fibers after curing, wherein the sizing agent is the glass fiber sizing agent. After the glass fiber is coated by the impregnating compound, the impregnating compound is used for producing continuous fiber reinforced thermoplastic plastics, particularly CFRT process reinforced PP, and the problem of thermal oxidation aging can be obviously improved. The glass fiber yarn coated with the impregnating compound has the advantages of less hairiness and good process smoothness in the using process, and the mechanical strength of the produced glass fiber roving can meet the production requirement of continuous fiber reinforced thermoplastic plastics.

In a preferred embodiment, the combustible content (i.e. the amount of the sizing agent coated on the glass fiber and cured in the glass fiber mass, namely the content of the coating layer) of the glass fiber produced by coating according to the invention is generally controlled to be 0.5-0.8%, the combustible content is not too high, otherwise, the adhesion between glass fiber bundles is increased, the binding property with matrix resin at the later stage is not facilitated, a compact continuous structure cannot be formed in sheet processing, and therefore, the thermal-oxidative aging resistance is affected, and if the content is too low, the integrity of the glass fiber cannot be effectively protected, the wear resistance is affected, and the content of effective components is too low, and the thermal-oxidative aging resistance is also not facilitated.

According to another aspect of the present invention, there is further provided a continuous fiber-reinforced thermoplastic, wherein the continuous fiber-reinforced thermoplastic is formed by compounding the glass fiber prepreg with a thermoplastic substrate. Preferably, the thermoplastic substrate is polypropylene. The glass fiber roving treated by the impregnating compound has the advantages that the glass fiber reinforced PP material produced by the CFRT process has stronger applicability, excellent product performance and outstanding thermo-oxidative aging resistance, and meets the market and application requirements. The specific compounding method may be a conventional process in the CFRT field, which is not described herein.

The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the invention as claimed.

Raw materials:

the impregnating compound used in the implementation of the invention comprises the following specific components:

the coupling agent is vinyl silane coupling agent, product number A-171, manufacturer: a map of the United states; alternatively, Dow Corning Z-6300;

the film forming agent A is PP wax emulsion (namely maleic anhydride modified polypropylene emulsion), and the manufacturer: jushi group, Inc., brand TX 170B; the grafting rate of maleic anhydride is 2-3%, the particle size of emulsion particles is 0.1-4.0 mu m, the melting point Tm of a polymer is 140-160 ℃, and the molecular weight is 1-3 ten thousand;

the film forming agent B is modified polyether polyurethane emulsion, and the manufacturer comprises: DIC in Japan, under the trademark VONDIC 1970 NE;

the dispersant is modified polysiloxane emulsion, and the manufacturer is German CHT, and the brand is HANSAPS 1050;

the lubricant is silicone oil emulsion, and the manufacturer: US Dow Corning, brand PMX-200; alternatively, kekai stanxtex G7607;

the antioxidant uses hindered phenol emulsion compound, the product trade mark is H10, and the manufacturer: BRUGGOLEN, germany.

The components of the impregnating compound used in the comparative example were as follows:

a coupling agent (mezzanine a1100, an aminosilane-based coupling agent);

film former A (Miketen 91735, PP wax modified emulsion, weight average molecular weight approximately 7 ten thousand);

film-forming agent B (Corsichu PU403, polyurethane emulsion, non-polyether pure polyurethane emulsion);

dispersant (korean musty PEG200, PEG-based lubricant);

antioxidants (sodium hypophosphite);

lubricant (Kekei 6760L, amide lubricant).

The preparation method of the impregnating compound comprises the following steps:

adding a coupling agent which is hydrolyzed by deionized water at room temperature of 20-30 times for 30-50 minutes in advance into a clean container; adding a dispersing agent into deionized water at 50-60 ℃, uniformly stirring, then adding a mixture of a film forming agent A emulsion and a film forming agent B emulsion which are respectively diluted by deionized water at 2 times of room temperature, uniformly stirring, and then adding into the prepared coupling agent solution; and then adding a lubricant diluted and dissolved by 10-20 times of room temperature deionized water, finally adding an antioxidant diluted by 60-70 ℃ deionized water, supplementing the weight of the impregnating compound to a set value by using the room temperature deionized water, and fully stirring for 20-40 minutes for later use.

Example (b):

preparing an impregnating compound according to the components in the table 1, then infiltrating and curing glass fibers with corresponding linear density in the table to produce 1200tex direct yarns, observing the strand state (an eye-feeling method, only need to be dispersed by hand) of the yarns, and testing the hairiness amount (simulating an outward-retreating process and testing glass fiber hairiness). Then, the soaked and cured fibers are made into CFRT-PP sheets, and the apparent states of the sheets are observed (mainly, the dispersion state of the monofilaments, whether the soaking is complete, whether white stripes, yellow spots and the like exist or not are observed).

The numerical values of the components of the impregnating compound are the weight percentage of the effective content of each functional component in the impregnating compound except water.

TABLE 1

Comparative example:

in order to further embody the beneficial effects of the invention, the impregnating compound with the currently common formula and different formula combinations is adopted as a comparative example, which is specifically shown in table 2.

TABLE 2

And (3) application performance testing:

test result of thermo-oxidative aging resistance

Under the CFRT reinforced PP process condition and the glass fiber weight content of 60%, the material is formed by pultrusion and mould pressing through a thermoplastic mould method process, the material is placed for 1000 hours under the condition of 150 ℃, the retention rate of tensile property is actually measured, and the following results are obtained through evaluation:

TABLE 3

As can be seen from the above table, by selecting the types and controlling the contents of the components of the sizing agent, the invention can obtain a desirable sizing agent formula, wherein the glass fiber prepared in example 4 has the best performance in resisting thermal oxidation aging. In comparative examples 1-6, the thermal-oxidative aging resistance is obviously low (the retention rate of thermal-oxidative aging is less than 70%), and the design requirements are not met.

In conclusion, the glass fiber reinforced PP material prepared from the glass fiber roving treated by the impregnating compound through the CFRT process has the advantages of stronger applicability, high mechanical property and good thermo-oxidative aging resistance, can meet the requirements of most CFRT process systems, and is more suitable for being used in the fields with high weather resistance requirements, such as the traffic transportation field and the like.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.