CN116180451A - A kind of continuous silicon carbide fiber sizing agent and its application - Google Patents

Abstract

The invention discloses a continuous silicon carbide fiber sizing agent and application thereof, wherein the continuous silicon carbide fiber sizing agent comprises the following components in parts by mass: 80-100 parts of water, 5-20 parts of waterborne polyurethane modified epoxy resin, 0.3-3 parts of acrylate modified polyurethane, 0.2-2 parts of emulsifier and 0.2-2 parts of softener. According to the continuous carbon fiber sizing agent provided by the invention, the waterborne polyurethane modified epoxy resin and the acrylic ester modified polyurethane are combined, and in the process of sizing the continuous carbon fiber, the waterborne polyurethane modified epoxy resin and the acrylic ester modified polyurethane undergo a crosslinking reaction during drying, and due to the existence of crosslinking points among fibers, fiber filaments and hairballs can be attached, so that the bonding force among the fibers is improved, and monofilament fibers are prevented from being separated from fiber bundles, so that the hairballs and the hairballs are reduced, and the bundling property and the wear resistance are improved.

Description

A kind of continuous silicon carbide fiber sizing agent and its application

technical field

The invention relates to a silicon carbide fiber sizing agent, in particular to a continuous silicon carbide fiber sizing agent and its application.

Background technique

The silicon carbide fiber prepared by the precursor method has the characteristics of high strength and high modulus, high temperature resistance, oxidation resistance, and low density. It has great application potential in the aerospace field and is a key material for improving the operating temperature and thrust-to-weight ratio of aeroengines. However, in the process of processing one-dimensional silicon carbide fibers into two-dimensional or multi-dimensional silicon carbide fiber-reinforced composite materials, the fibers need to be braided. Since silicon carbide fiber is a brittle material with low elongation at break and low elasticity, and as the length of the fiber increases, the strength of the fiber bundle will decrease. Single filament breakage is prone to occur, resulting in a large number of hairs or even breakage in the fiber bundle, which reduces the performance of the silicon carbide fiber braid, which not only affects the weaving efficiency of the silicon carbide fiber, but also seriously reduces the silicon carbide fabric. product quality.

In order to improve the weaving of silicon carbide fibers, it is necessary to sizing the fibers. Huang Xiangxian et al. (CN109853268A) used PVA (polyvinyl alcohol) as the main slurry to prepare a sizing agent with good film-forming properties and strong cohesiveness, which can tightly bond the fiber bundles together, and the clustering property is very good , the fiber wool is greatly reduced, and the wear resistance is increased, but there are problems of increased fiber stiffness and poor flexibility. People such as Zhang Xinyuan (CN111704478B) propose a kind of sizing method that is used for high-strength and high-modulus silicon carbide fiber, and this method is formulated into sizing agent with deionized water, epoxy resin type size and hydrophilic softening agent, epoxy The resin and hydrophilic softener ensure the suppleness of the fiber after sizing, and avoid the situation that the fiber is too stiff and brittle during weaving, but it will be lacking in clustering, and no emulsifier is added to the system, resulting There are problems in the long-term storage and use stability of the sizing agent. People such as Zong Sheng (CN110172829A) use water-based polyurethane as the main slurry to prepare a sizing agent, which can effectively improve the softness of the size film on the surface of silicon carbide fiber bundles, and improve the bundleability, wear resistance and strong elongation of the fibers. Toxic organic substances such as amines and amines are used as additives, which pose a certain threat to personal safety.

Contents of the invention

In view of the above problems, the first object of the present invention is to provide a continuous carbonized fiber sizing agent. The raw materials of the sizing agent of the present invention are all environment-friendly substances, are non-toxic, and are convenient for industrialized mass production and use.

The second object of the present invention is to provide an application of continuous carbonized fiber sizing agent. After the continuous carbonized fiber sizing agent is used for sizing the continuous carbonized fibers, the sized fibers not only have good bundling properties and wear resistance, but also have very good flexibility, which can effectively solve the problem of easy hair and breakage during the weaving process. The problem.

In order to achieve the above object, the present invention adopts the following technical solutions:

A continuous carbonized fiber sizing agent according to the present invention has the following ingredients in parts by mass: 80-100 parts of water, 5-20 parts of water-based polyurethane modified epoxy resin, 0.3-3 parts of acrylate modified polyurethane, emulsifier 0.2 to 2 parts, softener 0.2 to 2 parts.

The continuous carbonized fiber sizing agent provided by the present invention uses water-based polyurethane modified epoxy resin and acrylate-modified polyurethane for joint use. The inventors found that if the water-based polyurethane modified epoxy resin is used alone, the fiber after sizing is very supple , but the clustering is not good, and there are more fiber hairs, and the continuous carbonized fiber sizing agent obtained when the acrylate-modified polyurethane is introduced is in the process of sizing the continuous carbonized fiber. When drying, the water-based polyurethane modified epoxy resin and acrylic acid Ester-modified polyurethane undergoes a cross-linking reaction. Due to the existence of cross-linking points between fibers, the fiber wool and hair balls can be attached, which improves the bonding force between fibers and inhibits the detachment of monofilament fibers from fiber tows. , thereby reducing the amount of hair balls and hairs, thereby improving the bundling and wear resistance.

In the process of experimental exploration, the inventor tried a large number of formulas. Even for modified polyurethane, in addition to acrylate modified polyurethane, the inventor also tried organosilicon modified polyurethane, organic fluorine modified polyurethane, etc., and the result was that only acrylate When the modified polyurethane and water-based polyurethane modified epoxy resin are matched with each other, the clustering and abrasion resistance are optimal, and the acrylate modified polyurethane also has the characteristics of strong hydrophilicity and good stability, which makes the continuous carbonized fiber sizing agent more uniform and stable.

Of course, the amount of acrylate-modified polyurethane needs to be effectively controlled. If too much acrylate-modified polyurethane is added, the fibers after sizing will be too stiff and have poor flexibility, which is not conducive to weaving. Poor, it is easy to produce fuzz when weaving.

In a preferred solution, the continuous carbonized fiber sizing agent has the following components in parts by mass: 80-100 parts of water, 5-15 parts of water-based polyurethane modified epoxy resin, 0.7-1 part of acrylate-modified polyurethane, 0.3-0.6 parts of emulsifier, 0.6-1.2 parts of softener.

Further preferably, the continuous carbonized fiber sizing agent has the following composition in parts by mass: 80-90 parts of water, 10-15 parts of water-based polyurethane modified epoxy resin, 0.7-0.8 parts of acrylate-modified polyurethane, 0.6 parts of emulsifier, 0.8 to 1.2 parts of softener.

Preferably, the water is deionized water.

In a preferred scheme, the waterborne polyurethane modified epoxy resin is a waterborne polyurethane modified bisphenol A type epoxy resin.

The preferred solution, the preparation process of the water-based polyurethane modified epoxy resin is: stirring and mixing the water-based polyurethane, bisphenol A epoxy resin, and dibutyltin diacetate according to the mass ratio of 70-85:15-30:0.01-0.05 Evenly, then raise the temperature to 75-100°C and keep it warm for 2-5 hours, then cool to obtain the water-based polyurethane modified epoxy resin.

Further preferably, the preparation process of the water-based polyurethane is as follows: stir and mix polyethylene glycol (PEG), diisocyanate, and diglycolic acid according to the mass ratio of 50-70:30-40:5-10, and heat up to 60-60. Insulate at 80°C for 2 to 5 hours, and obtain water-based polyurethane after cooling.

The water-based polyurethane modified epoxy resin provided by the present invention has good water solubility, does not need to use organic solvents, and can exist stably as the main component of the sizing agent without delamination. In the process of polyurethane, hydrophilic groups are added, which can be better dissolved in water and are stable, avoiding the poor water solubility of unmodified polyurethane, which is difficult to dissolve when added to the sizing agent, resulting in uneven sizing agent.

In a preferred scheme, the emulsifier is alkylphenol polyoxyethylene ether (TX-10) or octylphenol polyoxyethylene ether (OP-10). The emulsifier adopted in the invention has high chemical stability, is easily soluble in water, has excellent emulsifying ability, and has the effect of removing static electricity.

In a preferred scheme, the softening agent is polyether amino block modified silicone oil.

In the actual operation process, the type of polyether amino block modified silicone oil that can be selected is NE 810 or NE820. The inventors found that polyether amino block modified silicone oil, as the fourth generation softener, has both amino modified Silicone oil has very excellent softening effect, and the introduced polyether segment greatly improves its hydrophilicity, which has the effect of self-emulsification without demulsification.

In a preferred scheme, the preparation process of the continuous carbonized fiber sizing agent is as follows: mixing and stirring water, water-based polyurethane-modified epoxy resin, acrylate-modified polyurethane, emulsifier, and softener according to the designed ratio to obtain the product.

The present invention also provides an application of a continuous carbonized fiber sizing agent. The continuous carbonized fiber sizing agent is used for sizing carbonized fibers. sizing agent, and then dry the silicon carbide fiber wrapped with sizing agent at 150-250°C to obtain sizing silicon carbide fiber.

In the application process of the present invention, after the silicon carbide fiber wrapped with the sizing agent is obtained, the silicon carbide fiber wrapped with the sizing agent is dried at 150-250°C. During this process, the water evaporates, and the remaining water-based polyurethane modified ring Oxygen resin and acrylate-modified polyurethane naturally become a layer of film attached to the fiber. Under the specific temperature of the present invention, water-based polyurethane-modified epoxy resin and acrylate-modified polyurethane will undergo cross-linking reaction, and the molecular weight Growing up makes the film better able to bond the loose fibers together and improve the bundle and wear resistance of the fibers after sizing.

In the present invention, the drying temperature needs to be effectively controlled. If the drying temperature is too high, the sizing agent will volatilize excessively, and even a cracking reaction will occur. If the drying temperature is too low, the drying at the normal sizing speed cannot be guaranteed. Fibers that cause curling end up sticking together.

Further preferably, the sizing process is to pass the silicon carbide fiber around the guide roller, and then pass through the sizing tank containing the continuous carbon fiber sizing agent, so that the silicon carbide fiber is soaked in the continuous carbon fiber sizing agent to obtain the wrapped sizing agent The silicon carbide fiber wrapped with sizing agent continues to pass through the press roller, and then passes through the oven to dry at 150-250°C, and then is collected by the wire-receiving machine at a speed of 1-3m/min to obtain Sizing silicon carbide fibers.

In the actual operation process, first clean the guide rollers, sizing tanks, and pressing rollers to ensure that the surface is smooth and free of debris to prevent damage to fibers, then open the oven, heat up to 150-250°C and keep warm.

Further preferably, it is dried at 160-220°C.

More preferably, it is dried at 200-220°C.

Principles and advantages

1. A continuous silicon carbide fiber sizing agent provided by the present invention can effectively solve the problem of high-strength and high-modulus silicon carbide fiber weaving difficulties. The use of the sizing agent realizes a layer of adhesive film coated on the surface of the silicon carbide fiber, making up for Cracks and defects on the silicon carbide fiber, while bonding the loose silicon carbide fiber bundles together, greatly reduces the fuzz and improves its bundle strength and wear resistance.

2. A continuous silicon carbide fiber sizing agent provided by the present invention is a sizing agent compounded by water-based polyurethane modified epoxy resin and modified polyurethane, which can take into account the two points of flexibility and clustering, and obtain carbonized fibers with excellent weaving performance. Silicon fiber.

3. The continuous carbonized fiber sizing agent provided by the present invention avoids the problem that the fiber is stiff after sizing the PVA (polyvinyl alcohol) sizing agent, so that the fiber will not be brittle due to bending; while solving simple epoxy resin sizing After agent sizing, the fiber bundles are poorly bundled, which reduces the wool in the weaving process and greatly improves the weaving quality.

4. The continuous carbonized fiber sizing agent provided by the present invention does not use organic reagents as solvents, is environmentally friendly and green, and the sizing agent is uniform and stable, and can be stored for a long time without deterioration or delamination. The fiber is well protected, and the raw material is cheap, easy to obtain, the process equipment is simple, and it can be applied in large-scale industry.

Description of drawings

Fig. 1 is a flow chart of the sizing process for silicon carbide fibers in the present invention.

In the figure, 1. silicon carbide fiber, 2. guide roller, 3. sizing tank, 4. pressure roller, 5. oven, 6. silicon carbide fiber after sizing, 7. wire take-up machine.

Detailed ways

In order to better demonstrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1

(1) Preparation of sizing agent

First, stir and mix polyethylene glycol (PEG), diisocyanate, and diglycolic acid according to the ratio of mass ratio 50:40:6, then heat up to 70°C for 3 hours, and obtain water-based polyurethane after cooling, then water-based polyurethane, Bisphenol A epoxy resin and dibutyltin diacetate (catalyst) were stirred and mixed evenly at a mass ratio of 70:30:0.02, then heated to 80°C for 5 hours, and cooled to obtain a water-based polyurethane modified epoxy resin.

Deionized water, water-based polyurethane modified epoxy resin, acrylate modified polyurethane, octylphenol polyoxyethylene ether (OP-10), polyether amino block modified silicone oil (NE 810) according to the mass ratio of 100:5 : 1:0.3:0.6 Mix and stir evenly to make continuous carbonized fiber sizing agent for later use.

(2) Preparation before sizing

Clean the guide roller 2, the sizing tank 3, and the pressure roller 4 to ensure that the surface is smooth and free of debris to prevent damage to the fibers, then open the oven 5, heat up to 160°C and keep warm.

(3) Sizing

The silicon carbide fiber 1 bypasses the guide roller 2, passes through the sizing tank 3, the pressure roller 4 and the oven 5 in sequence, and finally reaches the wire collector 7, and then pours the sizing agent into the sizing tank 3 to fully infiltrate the silicon carbide fiber 1 , and finally the filaments were collected at a speed of 3 m/min to obtain sized silicon carbide fibers 6 .

Example 2

(1) Preparation of sizing agent

Stir and mix polyethylene glycol (PEG), diisocyanate, and diglycolic acid according to the mass ratio of 60:30:10, then raise the temperature to 80°C for 2 hours, and obtain water-based polyurethane after cooling, then mix bisphenol water-based polyurethane, Type A epoxy resin and dibutyltin diacetate (catalyst) were stirred and mixed evenly at a mass ratio of 75:25:0.03, then heated to 100°C for 2 hours, and cooled to obtain a water-based polyurethane modified epoxy resin.

Deionized water, water-based polyurethane modified epoxy resin, acrylate modified polyurethane, alkylphenol polyoxyethylene ether (TX-10), polyether amino block modified silicone oil (NE 810) according to the mass ratio of 90:10 : 0.8: 0.6: 0.8 Mix and stir evenly, make a sizing agent for later use.

(2) Preparation before sizing

Clean the guide roller 2, the sizing tank 3, and the pressure roller 4 to ensure that the surface is smooth and free of debris to prevent damage to the fibers, then open the oven 5, heat up to 200°C and keep warm.

(3) Sizing

The silicon carbide fiber 1 bypasses the guide roller 2, passes through the sizing tank 3, the pressure roller 4 and the oven 5 in sequence, and finally reaches the wire collector 7, and then pours the sizing agent into the sizing tank 3 to fully infiltrate the silicon carbide fiber 1 , and finally the filaments were collected at a speed of 2 m/min to obtain sized silicon carbide fibers 6 .

Example 3

(1) Preparation of sizing agent

Stir and mix polyethylene glycol (PEG), diisocyanate and diglycolic acid evenly according to the ratio of mass ratio 65:36:7, then raise the temperature to 75°C and keep it warm for 5 hours, and obtain water-based polyurethane after cooling, then mix water-based polyurethane, bisphenol Type A epoxy resin and dibutyltin diacetate (catalyst) were stirred and mixed evenly at a mass ratio of 80:15:0.05, then heated to 90°C for 4 hours, and cooled to obtain a waterborne polyurethane modified epoxy resin.

Deionized water, water-based epoxy resin, acrylate-modified polyurethane, alkylphenol polyoxyethylene ether (TX-10), polyether amino block modified silicone oil (NE 820) according to the mass ratio of 80:15:0.7: 0.6:1.2 Mix and stir evenly, make sizing agent for later use.

(2) Preparation before sizing

Clean the guide roller 2, the sizing tank 3, and the pressure roller 4 to ensure that the surface is smooth and free of debris to prevent damage to the fibers, then open the oven 5, heat up to 220°C and keep warm.

(3) Sizing

The silicon carbide fiber 1 bypasses the guide roller 2, passes through the sizing tank 3, the pressure roller 4 and the oven 5 in sequence, and finally reaches the wire collector 7, and then pours the sizing agent into the sizing tank 3 to fully infiltrate the silicon carbide fiber 1 , and finally the filaments were collected at a speed of 1 m/min to obtain sized silicon carbide fibers 6 .

Comparative example 1

(1) Preparation of sizing agent

Mix deionized water, polyvinyl alcohol (PVA), alkylphenol polyoxyethylene ether (TX-10), polyether amino block modified silicone oil (NE 820) according to the mass ratio of 80:2:0.6:1.2 and stir evenly , made into a sizing agent for later use.

(2) Preparation before sizing

Clean the guide roller 2, the sizing tank 3, and the pressure roller 4 to ensure that the surface is smooth and free of debris to prevent damage to the fibers, then open the oven 5, heat up to 250°C and keep warm.

(3) Sizing

The silicon carbide fiber 1 bypasses the guide roller 2, passes through the sizing tank 3, the pressure roller 4 and the oven 5 in sequence, and finally reaches the wire collector 7, and then pours the sizing agent into the sizing tank 3 to fully infiltrate the silicon carbide fiber 1 , and finally the filaments were collected at a speed of 1 m/min to obtain sized silicon carbide fibers 6 .

It is found that although the fiber bundles after sizing are very good in bundling, they are very stiff, have weak wear resistance, and may break during weaving.

Comparative example 2

(1) Preparation of sizing agent

First, stir and mix polyethylene glycol (PEG), diisocyanate, and diglycolic acid according to the mass ratio of 65:36:7, then raise the temperature to 75°C and keep it warm for 5 hours, and obtain water-based polyurethane after cooling, and then add bisphenol A Type epoxy resin, water-based polyurethane, and dibutyltin diacetate (catalyst) were stirred and mixed evenly at a mass ratio of 80:15:0.05, then heated to 90°C for 4 hours, and cooled to obtain a water-based polyurethane modified epoxy resin.

Mix and stir deionized water, water-based polyurethane modified epoxy resin, alkylphenol polyoxyethylene ether (TX-10), polyether amino block modified silicone oil (NE 820) according to the mass ratio of 80:15:0.6:1.2 Evenly, make a sizing agent for later use.

(2) Preparation before sizing

Clean the guide roller 2, the sizing tank 3, and the pressure roller 4 to ensure that the surface is smooth and free of debris to prevent damage to the fibers, then open the oven 5, heat up to 220°C and keep warm.

(3) Sizing

The silicon carbide fiber 1 bypasses the guide roller 2, passes through the sizing tank 3, the pressure roller 4 and the oven 5 in sequence, and finally reaches the wire collector 7, and then pours the sizing agent into the sizing tank 3 to fully infiltrate the silicon carbide fiber 1 , and finally the filaments were collected at a speed of 1 m/min to obtain sized silicon carbide fibers 6 .

Comparative example 3

(1) Preparation of sizing agent

Stir and mix polyethylene glycol (PEG), diisocyanate and diglycolic acid evenly according to the ratio of mass ratio 65:36:7, then raise the temperature to 75°C and keep it warm for 5 hours, and obtain water-based polyurethane after cooling, then mix water-based polyurethane, bisphenol Type A epoxy resin and dibutyltin diacetate (catalyst) were stirred and mixed evenly at a mass ratio of 80:15:0.05, then heated to 90°C for 4 hours, and cooled to obtain a waterborne polyurethane modified epoxy resin.

Deionized water, water-based epoxy resin, acrylate-modified polyurethane, alkylphenol polyoxyethylene ether (TX-10), polyether amino block modified silicone oil (NE 820) according to the mass ratio of 80:15:5: 0.6:1.2 Mix and stir evenly, make sizing agent for later use.

(2) Preparation before sizing

Clean the guide roller 2, the sizing tank 3, and the pressure roller 4 to ensure that the surface is smooth and free of debris to prevent damage to the fibers, then open the oven 5, heat up to 220°C and keep warm.

(3) Sizing

The silicon carbide fiber 1 bypasses the guide roller 2, passes through the sizing tank 3, the pressure roller 4 and the oven 5 in sequence, and finally reaches the wire collector 7, and then pours the sizing agent into the sizing tank 3 to fully infiltrate the silicon carbide fiber 1 , and finally the filaments were collected at a speed of 1 m/min to obtain sized silicon carbide fibers 6 .

Performance comparison: according to the literature ("New Carbon Materials", 2006, 21(4): 337-341; title: temperature-resistant carbon fiber emulsion sizing agent) method to test the silicon carbide of Example 1-3 and Comparative Example 1-2 Abrasion resistance of fiber, fluff quantity index. The specific test method is to compare the bundling performance of silicon carbide fibers after sizing by hand feeling and visual inspection, and use the flexibility angle to characterize the flexibility of the fiber. The smaller the angle, the better the fiber flexibility. The test method for the flexibility angle is: take 30cm The long fiber bundles are placed on the rod-shaped object to let the fiber bundles hang down naturally. At this time, the angle formed by the fiber bundles on both sides of the rod-shaped object is the compliance angle. The performance evaluation results of the sized carbon fiber obtained are shown in Table 1 below.

Table 1

Abrasion resistance/time Filament weight/mg Bundle Compliance angle/° Example 1 145 3.6 excellent 35 Example 2 163 2.8 excellent 40 Example 3 187 1.9 excellent 50 Comparative example 1 109 1.5 excellent 120 Comparative example 2 97 7.3 generally 30 Comparative example 3 113 1.1 excellent 110

Comparative example 1 adopts polyvinyl alcohol (PVA) as the sizing agent of the main slurry. After sizing, the fiber bundles are too rigid, the wear resistance is weak, and the flexibility angle is required to be wide. Comparative example 2 only uses water-based polyurethane modified epoxy resin as the main material. The sizing agent for sizing has poor fiber bundles after sizing, and is prone to produce wool; while the sizing agent compounded by water-based polyurethane modified epoxy resin and modified polyurethane in the present invention can take into account the two points of flexibility and bundling , to obtain silicon carbide fibers with excellent weaving properties. In comparative example 3, too much acrylate-modified polyurethane was used, which made the fibers after sizing too stiff and had very poor flexibility, which was not conducive to the improvement of weaving performance.

Claims (10)

1. A continuous carbonized fiber sizing agent, characterized in that: in parts by mass, the composition is as follows: 80 to 100 parts of water, 5 to 20 parts of water-based polyurethane modified epoxy resin, 0.3 to 3 parts of acrylate modified polyurethane 0.2-2 parts of emulsifier, 0.2-2 parts of softener. 2. A continuous carbonized fiber sizing agent according to claim 1, characterized in that: the continuous carbonized fiber sizing agent has the following composition in parts by mass: 80 to 100 parts of water, water-based polyurethane modified ring 5-15 parts of oxygen resin, 0.7-1 part of acrylate-modified polyurethane, 0.3-0.6 parts of emulsifier, and 0.6-1.2 parts of softener. 3. A continuous carbonized fiber sizing agent according to claim 1, characterized in that: the continuous carbonized fiber sizing agent is composed of the following components in parts by mass: 80-90 parts of water, water-based polyurethane modified ring 10-15 parts of epoxy resin, 0.7-0.8 parts of acrylate-modified polyurethane, 0.6 parts of emulsifier, and 0.8-1.2 parts of softener. 4. A kind of continuous carbonized fiber sizing agent according to any one of claims 1-3, characterized in that: the water-based polyurethane modified epoxy resin is water-based polyurethane modified bisphenol A type epoxy resin; The preparation process of the water-based polyurethane modified epoxy resin is as follows: water-based polyurethane, bisphenol A epoxy resin, and dibutyltin diacetate are stirred and mixed evenly according to the mass ratio of 70-85:15-30:0.01-0.05, and then the temperature is raised Keep warm at 75-100°C for 2-5 hours, and cool to obtain water-based polyurethane modified epoxy resin. 5. A continuous carbonized fiber sizing agent according to claim 4, characterized in that: the preparation process of the water-based polyurethane is: polyethylene glycol, diisocyanate, and diglycolic acid are mixed according to the mass ratio of 50-70:30 ～40: 5～10 Stir and mix evenly, raise the temperature to 60～80°C and keep it warm for 2～5 hours, and obtain water-based polyurethane after cooling. 6. A continuous carbonized fiber sizing agent according to claim 1, characterized in that: said emulsifier is alkylphenol polyoxyethylene ether or octylphenol polyoxyethylene ether. 7. A continuous carbonized fiber sizing agent according to claim 1, characterized in that: the softening agent is polyether amino block modified silicone oil. 8. A kind of continuous carbonized fiber sizing agent according to claim 1, characterized in that: the preparation process of the continuous carbonized fiber sizing agent is as follows: according to the design ratio, water, water-based polyurethane modified epoxy resin, acrylate modified Mix and stir permanent polyurethane, emulsifier and softener evenly to get ready. 9. The application of a continuous carbonized fiber sizing agent according to any one of claims 1-8, characterized in that: the continuous carbonized fiber sizing agent is used for sizing carbonized fibers, and the sizing process is: carbonization The silicon fiber is soaked in the continuous carbon fiber sizing agent to obtain the silicon carbide fiber wrapped with the sizing agent, and then the silicon carbide fiber wrapped with the sizing agent is dried at 150-250°C to obtain the sized silicon carbide fiber. 10. The application of a continuous carbonized fiber sizing agent according to claim 9, characterized in that: the sizing process is that the silicon carbide fiber is bypassed by a guide roller, and then passed through a sizing tank containing a continuous carbonized fiber sizing agent In the process, the silicon carbide fiber is soaked in the continuous carbon fiber sizing agent to obtain the silicon carbide fiber wrapped with the sizing agent, and the silicon carbide fiber wrapped with the sizing agent continues to pass through the press roller, and then passes through the oven to dry at 150-250°C, Then the wire is collected by the wire-receiving machine at a speed of 1-3m/min, and the sized silicon carbide fiber is obtained.

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