阅读说明：本技术 一种玻璃纤维浸润剂及其制备方法和应用 (Glass fiber impregnating compound and preparation method and application thereof ) 是由 章建忠 黄建 樊家澍 费振宇 张志坚 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种玻璃纤维浸润剂,该浸润剂包含有效组分和水,有效组分的质量占浸润剂总质量的5～10％；所述有效组分包括硅烷偶联剂、成膜剂A、成膜剂B、润滑剂、抗水解剂和抗氧化剂,且有效组分中各组分的质量占有效组分总质量的百分比表示如下：硅烷偶联剂1～10％,成膜剂A 50～90％,成膜剂B 8～45％,润滑剂0.5～5％,抗水解剂0.1～1％,抗氧化剂0.1～1％；其中,硅烷偶联剂为氨基硅烷偶联剂,成膜剂A为聚丙烯乳液,成膜剂B为聚乙烯乳液。采用该浸润剂生产的玻璃纤维产品适用于增强聚丙烯复合材料,使得聚丙烯制品具有优异的干态机械性能、良好的耐水解性能和耐老化性能,满足市场及应用需求。(The invention discloses a glass fiber impregnating compound, which comprises effective components and water, wherein the mass of the effective components accounts for 5-10% of the total mass of the impregnating compound; the effective components comprise a silane coupling agent, a film forming agent A, a film forming agent B, a lubricating agent, an anti-hydrolysis agent and an antioxidant, and the mass percentage of each component in the effective components in the total mass of the effective components is as follows: 1-10% of a silane coupling agent, 50-90% of a film forming agent A, 8-45% of a film forming agent B, 0.5-5% of a lubricant, 0.1-1% of an anti-hydrolysis agent and 0.1-1% of an antioxidant; wherein, the silane coupling agent is amino silane coupling agent, the film forming agent A is polypropylene emulsion, and the film forming agent B is polyethylene emulsion. The glass fiber product produced by the impregnating compound is suitable for reinforced polypropylene composite materials, so that a polypropylene product has excellent dry mechanical property, good hydrolysis resistance and aging resistance, and meets the market and application requirements.)

1. The glass fiber impregnating compound is characterized by comprising effective components and water, wherein the mass of the effective components accounts for 5-10% of the total mass of the impregnating compound; the effective components comprise a silane coupling agent, a film forming agent A, a film forming agent B, a lubricating agent, an anti-hydrolysis agent and an antioxidant, and the mass percentage of each component in the effective components in the total mass of the effective components is as follows:

wherein, the silane coupling agent is an aminosilane coupling agent; the film forming agent A is polypropylene emulsion; the film forming agent B is polyethylene emulsion.

2. The glass fiber sizing agent according to claim 1, wherein the mass percentage of each component in the effective components to the total mass of the effective components is as follows:

wherein the silane coupling agent is an aminosilane coupling agent; the film forming agent A is a high-molecular copolymerized polypropylene emulsion; the film forming agent B is modified polyethylene wax emulsion.

3. The glass fiber sizing agent according to claim 1, wherein the polypropylene emulsion has an average particle diameter of 5 to 15 μm; the polypropylene emulsion is prepared from polypropylene with the relative molecular mass of 20000-100000; the average particle diameter of the polyethylene emulsion is 0.1-1.5 microns; the polyethylene emulsion is prepared from polyethylene with the relative molecular mass of 1000-20000.

4. The glass fiber sizing agent according to claim 1, wherein said lubricant is a hydrocarbon lubricant; the hydrolysis resistant agent is phosphate hydrolysis resistant agent; the antioxidant is inorganic salt antioxidant.

5. The glass fiber sizing agent according to claim 1, wherein said lubricant is one or more of polyethylene, chlorinated hydrocarbon and fluorinated hydrocarbon.

6. The glass fiber sizing agent according to claim 1, wherein said hydrolysis-resistant agent is one or both of 1-ethyl-carbodiimide phosphate and 1-ethyl-3-carbodiimide phosphate.

7. The glass fiber sizing agent according to claim 1, wherein said antioxidant is one or more of sodium hypophosphite, calcium hypophosphite, magnesium hypophosphite and iron hypophosphite.

8. A method for preparing a glass fiber sizing agent according to any one of claims 1 to 7, comprising the steps of:

1S: adding a silane coupling agent hydrolyzed in advance into a clean container;

2S: adding a film forming agent A and a film forming agent B which are respectively diluted by water into the container in the step 1S;

3S: and (4) adding the lubricant, the anti-hydrolysis agent and the antioxidant which are respectively diluted and dissolved by water into the container in the step 2S, complementing the balance of water and uniformly stirring to obtain the impregnating compound.

9. A glass fiber product produced by coating the glass fiber impregnating agent defined in any one of claims 1 to 7.

10. Use of a glass fiber product according to claim 9 in the field of glass fiber reinforced polypropylene composites.

Technical Field

The invention relates to the technical field of glass fiber production and manufacturing, in particular to a glass fiber impregnating compound and a preparation method and application thereof, and particularly relates to a glass fiber chopped strand impregnating compound suitable for reinforced polypropylene.

Background

Polypropylene (PP) is thermoplastic synthetic resin with excellent performance, is colorless semitransparent thermoplastic light general plastic, and has the advantages of small specific gravity, easy processing, aging resistance, heat resistance, good electrical insulation, high mechanical property, good wear-resistant processing performance and the like. With the development of polypropylene modification and processing technology, polypropylene is increasingly developed towards engineering direction, and is widely developed and applied in a plurality of fields such as automobiles, electronic appliances, buildings, packaging, food processing and the like. The glass chopped strands are used as the best partner of the reinforced thermoplastic composite material, so that the composite material can be endowed with excellent comprehensive performance, the glass fiber reinforced polypropylene composite material has the advantages of low density, low price, recycling and the like, and the modified composite material has the advantages of higher mechanical property, hardness, load deformation temperature, better dimensional stability and the like, so that the requirements of different special fields are met. However, with the deep development of the material industry, in the process of continuously expanding the application field of the glass fiber reinforced polypropylene composite material, the limitation of the material characteristics is more and more obvious under the severe environments of high temperature, high pressure and high humidity, and the most typical problem is that the hydrolysis resistance and the aging resistance of the glass fiber reinforced polypropylene composite material are relatively to be further improved, particularly under the conditions of high temperature and high humidity, the hydrolysis chain scission reaction is easy to occur, so that the material degradation is caused, the mechanical property is obviously reduced, and the service life of the material is greatly reduced. This greatly limits the use of polypropylene composites in high heat and humidity conditions, such as automotive engine peripheries, valve components for various pump bodies, transfer ducts, air conditioning vanes, and the like.

Therefore, the development of a glass fiber sizing agent for reinforcing polypropylene is very important for further developing the application field of the glass fiber reinforced polypropylene composite material by improving the hydrolysis resistance and the aging resistance of the glass fiber reinforced polypropylene composite material.

Disclosure of Invention

The invention aims to provide a glass fiber impregnating compound, in particular to a glass fiber chopped strand impregnating compound for reinforcing polypropylene, and a preparation method and application thereof, which can improve the hydrolysis resistance and the aging resistance of a material and meet the requirements of production and use on the premise of ensuring the mechanical property of a composite material.

In the present invention, the total mass of the effective components and the mass of each component in the effective components are expressed in terms of solid mass, and if the components are in the form of emulsion or solution, the content thereof is expressed in terms of solid mass (i.e., mass of the remaining part after drying).

According to one aspect of the invention, the glass fiber impregnating compound comprises effective components and water, wherein the mass of the effective components accounts for 5-10% of the total mass of the impregnating compound; the effective components comprise a silane coupling agent, a film forming agent A, a film forming agent B, a lubricating agent, an anti-hydrolysis agent and an antioxidant, and the mass percentage of each component in the effective components in the total mass of the effective components is as follows:

wherein, the silane coupling agent is amino silane coupling agent, the film forming agent A is polypropylene emulsion, and the film forming agent B is polyethylene emulsion.

Further, the mass percentage of each component in the effective components in the total mass of the effective components is expressed as follows:

wherein the film forming agent A is a high-molecular copolymerized polypropylene emulsion; the film forming agent B is modified polyethylene wax emulsion.

Further, the average particle diameter of the polypropylene emulsion is 5-15 micrometers.

Further, the polypropylene emulsion is prepared from polypropylene with the relative molecular mass of 20000-100000.

Further, the average particle diameter of the polyethylene emulsion is 0.1-1.5 microns.

Further, the polyethylene emulsion is prepared from polyethylene with the relative molecular mass of 1000-20000.

Further, the lubricant is a hydrocarbon lubricant.

Further, the lubricant is one or more of polyethylene, chlorohydrocarbon and fluorocarbon.

Further, the anti-hydrolysis agent is a phosphate type anti-hydrolysis agent.

Further, the anti-hydrolysis agent is one or two of 1-ethyl-carbodiimide phosphate and 1-ethyl-3-carbodiimide phosphate.

Further, the antioxidant is an inorganic salt antioxidant.

Further, the antioxidant is one or more of sodium hypophosphite, calcium hypophosphite, magnesium hypophosphite and iron hypophosphite.

Further, the mass percentage of each component in the effective components in the total mass of the effective components is expressed as follows:

furthermore, the mass percentage of each component in the effective components in the total mass of the effective components is expressed as follows:

further, the pH value of the impregnating compound is 7-12.

Furthermore, the pH value of the impregnating compound is 10-11.

The silane coupling agent is selected from aminosilane coupling agents, so that the damage condition of glass fibers in the wire drawing process can be reduced, the matching property between the glass fibers and polypropylene matrix resin can be better, the bonding force of the two interfaces is strong, and the selection of the silane coupling agent is one of the key points of the invention for enhancing the strength of the polypropylene material by the glass fibers. Preferably, the silane coupling agent is one or two of a bisamino silane coupling agent and a polyamino silane coupling agent; more preferably, the silane coupling agent is a silane coupling agent product having a product designation A-1120 or AX-105. Meanwhile, the dosage of the silane coupling agent needs to be controlled in a proper range, and if the dosage of the silane coupling agent is too much, the color of the product is yellow, the product is hardened and embrittled, and unnecessary waste is caused; if the amount is too small, the mechanical properties of the product cannot meet the design requirements. Therefore, the amount of the silane coupling agent in the present invention is 1.0 to 10.0% by mass, preferably 1.5 to 8.0% by mass, more preferably 2.0 to 6.5% by mass, and still more preferably 3.0 to 5.0% by mass of the total mass of the effective components.

The film-forming agent is used as the main component of the sizing agent, plays a role in protecting the fiber and plays a decisive role in the mechanical strength of the final product of the glass fiber, therefore, the selection of the film-forming agent is also one of the key points of the invention. The film forming agent adopts the combination of a film forming agent A and a film forming agent B, wherein the film forming agent A is polypropylene emulsion, and the film forming agent B is polyethylene emulsion; the dosage of the polypropylene emulsion is larger than that of the polyethylene emulsion, and if the dosage of the polypropylene emulsion is smaller than that of the polyethylene emulsion, the clustering performance deviation of the product can be caused, the service performance of the product is influenced, and the mechanical performance of the product is influenced. The invention adopts different types of emulsions to be matched and used, and gives consideration to the convergence and the hardness of the glass fiber, wherein the polypropylene emulsion is used as a main film-forming agent to protect the glass fiber, so that the glass fiber has good use performance; the polyethylene emulsion is used as an auxiliary film-forming agent, so that the product has good dispersibility and smoothness; the two film forming agents and the polypropylene resin have good compatibility, so that the product has good mechanical properties. Meanwhile, the mass (solid content) of the film forming agent A accounts for 50.0-90.0% of the total mass of the effective components, preferably 55.0-82.0%, more preferably 59.0-75.0%, and even more preferably 62.0-70.0%. The mass (solid content) of the film forming agent B accounts for 8.0-45.0% of the total mass of the effective components, preferably 14.0-42.0%, more preferably 20.0-36.0%, and even more preferably 24.0-31.0%. The film forming agent A polypropylene emulsion and the film forming agent B polyethylene emulsion can be prepared by self according to the prior art or can be prepared by using commercial products.

Preferably, the average particle diameter of the polypropylene emulsion is 5-15 microns; the polypropylene emulsion is prepared from polypropylene with the relative molecular mass of 20000-100000; more preferably, the relative molecular mass of the polypropylene is 60000-80000. Preferably, the average particle diameter of the polyethylene emulsion is 0.1-1.5 microns; the polyethylene emulsion is prepared from polyethylene with the relative molecular mass of 1000-20000; more preferably, the polyethylene has a relative molecular mass of 8000 to 12000.

Preferably, the film forming agent A used in the invention adopts high-molecular copolymer polypropylene emulsion, and the mechanical property, especially the impact resistance, of the glass fiber product can be improved by adopting the high-molecular copolymer polypropylene emulsion. The film forming agent B adopts modified polyethylene wax emulsion which has good compatibility with the high-molecular copolymerized polypropylene emulsion, and simultaneously, the glass fiber product has good lubricity and softness.

The lubricant is mainly used in the invention to enhance the drawing and post-treatment of the glass fiber in the production process and the lubricating effect in the use process. Preferably, the lubricant is a water-soluble hydrocarbon lubricant; more preferably, the lubricant is one or more of low molecular weight polyethylene, chlorinated hydrocarbon and fluorinated hydrocarbon. The water-soluble hydrocarbon lubricant is used, and the hydrocarbon lubricant and the film forming agent have good compatibility, so that the product has better lubricating property. Meanwhile, the using amount of the lubricant is controlled, if the using amount of the lubricant is too much, the bundling property of the glass fiber yarns is influenced, and the mechanical property of the final glass fiber reinforced polypropylene composite material is influenced; if the amount of the glass fiber is too small, the lubricating effect of the glass fiber is poor, the smoothness of the product in the using process is affected, and the hairiness problem is caused. The mass of the lubricant accounts for 0.5-5.0% of the total mass of the effective components, preferably 0.8-4.0%, more preferably 1.5-3.0%, and further preferably 1.8-2.4%.

The hydrolysis resistant agent can delay the degradation of high molecular weight substances and can effectively keep the substances to have high molecular weight, thereby keeping the mechanical property of the material from being rapidly reduced. Preferably, the hydrolysis resistant agent is phosphate hydrolysis resistant agent; more preferably, the anti-hydrolysis agent is one or two of 1-ethyl-carbodiimide phosphate and 1-ethyl-3-carbodiimide phosphate. The phosphate hydrolysis resistant agent can keep the impregnating compound system stable and reduce the hydrolysis reaction speed of the polypropylene. The dosage of the anti-hydrolysis agent must be controlled within a certain range, and the use performance of the glass fiber product and the mechanical performance of the glass fiber product are influenced by excessive dosage; if the dosage is too small, the hydrolysis resistance of the product can not meet the design requirement. Therefore, the mass of the anti-hydrolysis agent accounts for 0.1-1.0%, preferably 0.2-0.9%, more preferably 0.4-0.8%, and even more preferably 0.5-0.7% of the total mass of the effective components.

The antioxidant is mainly used for delaying and inhibiting the oxidation process of the polypropylene product, preventing the polypropylene product from aging and prolonging the service life of the polypropylene product. Preferably, the antioxidant is an inorganic salt antioxidant; more preferably, the antioxidant is one or more of sodium hypophosphite, calcium hypophosphite, magnesium hypophosphite and iron hypophosphite. The inorganic salt antioxidant can prevent or delay chain scission of polypropylene molecular chains, so that the product has excellent ageing resistance. The antioxidant accounts for 0.1-1.0% of the total mass of the effective components, preferably 0.2-0.8%, more preferably 0.3-0.6%, and even more preferably 0.4-0.5%.

According to a second aspect of the present invention, there is provided a method for preparing the glass fiber sizing agent, specifically comprising the following steps:

1S: adding a silane coupling agent hydrolyzed in advance into a clean container;

2S: adding a film forming agent A and a film forming agent B which are respectively diluted by water into the container in the step 1S;

3S: and (4) adding the lubricant, the anti-hydrolysis agent and the antioxidant which are respectively diluted and dissolved by water into the container in the step 2S, complementing the balance of water and uniformly stirring to obtain the impregnating compound.

Further, in the step 1S, room-temperature water which accounts for 20-50 times of the mass of the silane coupling agent is adopted as the silane coupling agent, and hydrolysis is carried out for 15-45 minutes.

Further, in the step 2S, the film forming agent A and the film forming agent B are respectively diluted by room-temperature water which accounts for 2-10 times of the mass of each film forming agent A and film forming agent B.

Further, in the step 3S, the lubricant, the anti-hydrolysis agent and the antioxidant are respectively diluted by room-temperature water which accounts for 5-20 times of the mass of the lubricant, the anti-hydrolysis agent and the antioxidant.

According to a third aspect of the present invention, there is provided a glass fiber product produced by coating the glass fiber sizing agent.

According to a fourth aspect of the present invention there is provided the use of the aforesaid glass fibre product in the field of reinforced polypropylene composites.

The advantageous effects of selecting the above ranges of the content of each component of the glass fiber sizing agent of the present application will be further described below by way of preferred examples.

Preferred example 1

The glass fiber impregnating compound comprises effective components and water, wherein the mass of the effective components accounts for 5-10% of the total mass of the impregnating compound; the effective components comprise a silane coupling agent, a film forming agent A, a film forming agent B, a lubricating agent, an anti-hydrolysis agent and an antioxidant, and the mass percentage of each component in the effective components in the total mass of the effective components is as follows:

wherein, the silane coupling agent is an aminosilane coupling agent; the film forming agent A is polypropylene emulsion; the film forming agent B is polyethylene emulsion.

Preferred example two

The glass fiber impregnating compound comprises effective components and water, wherein the mass of the effective components accounts for 5-10% of the total mass of the impregnating compound; the effective components comprise a silane coupling agent, a film forming agent A, a film forming agent B, a lubricating agent, an anti-hydrolysis agent and an antioxidant, and the mass percentage of each component in the effective components in the total mass of the effective components is as follows:

wherein, the silane coupling agent is an aminosilane coupling agent; the film forming agent A is a high-molecular copolymerized polypropylene emulsion; the film forming agent B is modified polyethylene wax emulsion.

Preferred example three

The glass fiber impregnating compound comprises effective components and water, wherein the mass of the effective components accounts for 5-10% of the total mass of the impregnating compound; the effective components comprise a silane coupling agent, a film forming agent A, a film forming agent B, a lubricating agent, an anti-hydrolysis agent and an antioxidant, and the mass percentage of each component in the effective components in the total mass of the effective components is as follows:

wherein, the silane coupling agent is an aminosilane coupling agent; the film forming agent A is polypropylene emulsion; the film forming agent B is polyethylene emulsion; the lubricant is a hydrocarbon lubricant; the anti-hydrolysis agent is phosphate anti-hydrolysis agent; the antioxidant is inorganic salt antioxidant.

Preferred example four

The glass fiber impregnating compound comprises effective components and water, wherein the mass of the effective components accounts for 5-10% of the total mass of the impregnating compound; the effective components comprise a silane coupling agent, a film forming agent A, a film forming agent B, a lubricating agent, an anti-hydrolysis agent and an antioxidant, and the mass percentage of each component in the effective components in the total mass of the effective components is as follows:

wherein, the silane coupling agent is an aminosilane coupling agent; the film forming agent A is a high-molecular copolymerized polypropylene emulsion; the film forming agent B is modified polyethylene wax emulsion; the lubricant is a hydrocarbon lubricant; the anti-hydrolysis agent is phosphate anti-hydrolysis agent; the antioxidant is inorganic salt antioxidant.

Preferred example five

The glass fiber impregnating compound comprises effective components and water, wherein the mass of the effective components accounts for 5-10% of the total mass of the impregnating compound; the effective components comprise a silane coupling agent, a film forming agent A, a film forming agent B, a lubricating agent, an anti-hydrolysis agent and an antioxidant, and the mass percentage of each component in the effective components in the total mass of the effective components is as follows:

wherein, the silane coupling agent is an aminosilane coupling agent; the film forming agent A is polypropylene emulsion; the film forming agent B is polyethylene emulsion; the lubricant is one or more of polyethylene, chlorohydrocarbon and fluorocarbon; the hydrolysis resisting agent is one or two of 1-ethyl-carbodiimide phosphate and 1-ethyl-3-carbodiimide phosphate; the antioxidant is one or more of sodium hypophosphite, calcium hypophosphite, magnesium hypophosphite and iron hypophosphite.

Preferred example six

The glass fiber impregnating compound comprises effective components and water, wherein the mass of the effective components accounts for 5-10% of the total mass of the impregnating compound; the effective components comprise a silane coupling agent, a film forming agent A, a film forming agent B, a lubricating agent, an anti-hydrolysis agent and an antioxidant, and the mass percentage of each component in the effective components in the total mass of the effective components is as follows:

wherein, the silane coupling agent is an aminosilane coupling agent; the film forming agent A is a high-molecular copolymerized polypropylene emulsion; the film forming agent B is modified polyethylene wax emulsion; the lubricant is one or more of polyethylene, chlorohydrocarbon and fluorocarbon; the hydrolysis resisting agent is one or two of 1-ethyl-carbodiimide phosphate and 1-ethyl-3-carbodiimide phosphate; the antioxidant is one or more of sodium hypophosphite, calcium hypophosphite, magnesium hypophosphite and iron hypophosphite.

The combustible content (namely the proportion of the amount of the impregnating compound coated on the glass fiber in the mass of the glass fiber) of the glass fiber is generally controlled to be 0.2-4.0%, the specific value needs to be according to the performance of the raw materials, and from the performance index and experimental test results which need to be achieved by the product, the mechanical property, hydrolysis resistance and aging resistance of the product produced with the combustible content of 0.5-1.0% can meet the requirements.

Compared with the prior art, the glass fiber roving treated by the impregnating compound has the advantages that the polypropylene material reinforced by the glass fiber roving is high in applicability, smooth in extrusion and use, excellent in product performance, outstanding in hydrolysis resistance and aging resistance, and capable of meeting market and application requirements.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention, and it is obvious that the described embodiments are some but not all embodiments of the present invention. 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. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The impregnating compound used in the embodiment of the invention comprises the following components:

coupling agent: an aminosilane coupling agent;

lubricant: low molecular weight polyethylene;

film-forming agent A: a high molecular weight copolymerized polypropylene emulsion;

film-forming agent B: a modified polyethylene wax emulsion;

hydrolysis resistance agent: 1-ethyl-carbodiimide phosphate;

antioxidant: and (3) sodium hypophosphite.

It should be noted that the specific types and contents of the components selected above do not limit the scope of the present application.

Comparative example 1:

coupling agent: an aminosilane coupling agent;

lubricant: low molecular weight polyethylene;

film-forming agent A: a high molecular weight copolymerized polypropylene emulsion;

film-forming agent B: a modified polyethylene wax emulsion;

hydrolysis resistance agent: 1-ethyl-carbodiimide phosphate;

antioxidant: and (3) sodium hypophosphite.

Comparative example 2:

coupling agent: an epoxy silane coupling agent;

lubricant: a silicone oil lubricant;

film-forming agent A: a polypropylene emulsion;

film-forming agent B: an aqueous polyethylene wax emulsion;

hydrolysis resistance agent: 1-ethyl-carbodiimide phosphate;

antioxidant: and (3) sodium hypophosphite.

Table 1 shows the results of specific tests on chopped strand products produced by a certain glass fiber production process in specific formulation examples and comparative examples. The numerical values of all components in the effective components of the impregnating compound are all calculated by the percentage of the solid content of each component to the total solid mass of the effective components, and the solid content of the impregnating compound is calculated by the percentage of the solid mass of the effective components to the total mass of the impregnating compound.

TABLE 1

The appearance state of the product is divided into excellent, good, medium and poor, wherein excellent means that the product has uniform granularity, basically no loose silk and hairiness and good fluidity; good means that the product has uniform granularity, a small amount of loose silks, no hairiness and good product fluidity; the center shows that the uniformity of the granularity of the product is general, a small amount of loose silks and hairiness exist, and the flowability of the product is general; the difference indicates that the product has poor granularity uniformity, more loose silks and hairiness and poor product flowability.

As can be seen from the table 1, through the selection of the types and the content control of the components of the impregnating compound, a satisfactory impregnating compound formula can be obtained, compared with comparative examples 1 and 2, the performances of the glass fiber reinforced polypropylene material produced by coating the impregnating compound prepared in the embodiments 1 to 6 of the invention are superior to those of the comparative examples in the overall performance, and particularly in the aspect of hydrolysis resistance and aging resistance tests, the tensile retention rate of the material is far higher than that of the comparative examples; the polypropylene material reinforced by the glass fiber prepared in the embodiment 3 has the most prominent indexes of mechanical property, hydrolysis resistance, aging resistance and the like.

In conclusion, the glass fiber chopped strands treated by the impregnating compound have the advantages of strong applicability of reinforced polypropylene materials, smooth extrusion and use, excellent product performance, outstanding hydrolysis resistance and ageing resistance, and capability of meeting the market and application requirements.

Finally, it should be noted that: in this document, 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.

The above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.