Silicate fiber surface treatment agent and treatment method thereof

Abstract

The invention provides a silicate fiber surface treatment agent and a treatment method thereof. The silicate fiber surface treatment agent comprises an activating agent, a pH regulator and water according to the mass percentage of (1-20): (0.1-2): (79.9-98.9), the activating agent comprises a catechol structure, and the catechol structure reacts with silicon hydroxyl on the surface of the silicate fiber to generate a complex; the pH value of the silicate fiber surface treating agent is 6-10; the silicate fiber surface treatment agent is heated to 40-80 DEG C, silicate fibers are placed in the silicate fiber surface treatment agent in a standing mode, the weight of the silicate fibers accounts for 1-10% of the total weight of the silicate fiber surface treatment agent, the silicate fibers are taken out after the temperature is kept constant for 10-30 min, and the silicate fibers are cleaned with water. Compared with the prior art, the treating agent is green and environment-friendly, mild in reaction condition, free of corrosion to equipment, capable of activating the fiber surface without obviously damaging the mechanical property of the fiber, and capable of increasing the interface bonding strength of the silicate fiber and a polymer material; in addition, the raw material components of the impregnating compound are easy to obtain, the cost is low, the preparation method is simple and convenient, and large-scale production is easy.

Description

Technical Field

[0001] The invention relates to the technical field of fiber surface treatment, and in particular to a silicate fiber surface treatment agent and a treatment method thereof. Background Art

[0002] Silicate fiber is a high-performance inorganic non-metallic material, mainly composed of chemical elements such as silicon, oxygen, aluminum, iron, and calcium, with good high temperature resistance, corrosion resistance, and electrical insulation properties, including basalt fiber, glass fiber, and ceramic fiber. Among them, basalt fiber and glass fiber not only have high mechanical strength, but also have excellent comprehensive properties. Therefore, they are often used as reinforcements for polymer-based composite materials and are used in aerospace, vehicle hulls, wind turbine blades, construction and transportation, and other fields.

[0003] However, silicate fiber is an inorganic material with poor compatibility with commonly used organic polymers. In addition, the surface of silicate fiber is chemically inert, so it is difficult to form effective chemical bonds at the interface between the fiber and the polymer, which seriously affects the composite effect of silicate fiber and polymer materials and limits its application in the field of high-performance composite materials. Therefore, it is necessary to modify the surface of silicate fiber.

[0004] At present, the most commonly used modification technology is sizing modification, that is, coating a sizing coating composed of film-forming agent, coupling agent, lubricant and antistatic agent on the fiber surface, which has become an indispensable step in the production process of silicate fiber. However, the coating of sizing agent mainly increases the physical interaction at the interface, and the chemical interaction is difficult to be greatly improved. Therefore, the fiber surface needs to be treated to increase the content of active groups.

[0005] Existing research uses strong acid or strong alkali solutions to treat the surface of silicate fibers. Although this can change the surface chemical composition and increase the surface roughness at the same time, it will also destroy the mechanical strength of the fiber itself and cause environmental pollution.

[0006] Therefore, it is necessary to develop a new type of fiber surface treatment agent that has the characteristics of surface modification, no obvious damage to the strength of the fiber itself, and environmental friendliness. Summary of the invention

[0007] The present invention aims to solve the problem that silicate fiber as an inorganic material has poor composite performance with organic polymer materials, and provides a silicate fiber surface treatment agent and a treatment method thereof. The treatment agent has simple ingredients, a simple preparation method, is environmentally friendly, will not significantly affect the strength of the fiber itself, can increase the surface activity of the fiber, and improve the interface performance of silicate fiber and polymer materials.

[0008] The present invention provides a silicate fiber surface treatment agent, comprising an activator, a pH regulator and water in a mass percentage of 1-20:0.1-2:79.9-98.9;

[0009] The activator includes a catechol structure, which reacts with the silanol groups on the surface of the silicate fiber to form a complex;

[0010] The activator is:

[0011]

[0012] The pH value of the silicate fiber surface treatment agent is 6-10.

[0013] The silicate fiber surface treatment agent described in the present invention is preferably used as an activator any one of the following: catechol, pyrogallol, gallic acid, 3,4-dihydroxybenzoic acid, methyl gallate, titanium iron reagent, dopamine hydrochloride, levodopa, tea polyphenols and their derivatives.

[0014] In the silicate fiber surface treatment agent described in the present invention, as a preferred embodiment, the pH regulator is any one of the following: sodium hydroxide, potassium hydroxide, ammonia water, calcium hydroxide, sodium carbonate, sodium bicarbonate, calcium oxide, ethanolamine and triethylamine.

[0015] In the silicate fiber surface treatment agent described in the present invention, as a preferred embodiment, the silicate fiber is any one of the following: basalt fiber, glass fiber and ceramic fiber.

[0016] In the silicate fiber surface treatment agent of the present invention, as a preferred embodiment, the mass percentage of the activator in the silicate fiber surface treatment agent is preferably 8 to 20.

[0017] The present invention provides a method for treating a silicate fiber surface treatment agent, comprising the following steps:

[0018] S1, add 1 to 20 parts by weight of an activator into a container, then add water to make the total weight of the container 95 to 98.5, and stir until the activator is completely dissolved to obtain an activator solution;

[0019] S2, adding 0.1-2 parts by weight of a pH adjuster to the activator solution to adjust the pH value to 6-10, and adding a surplus of water to make the total parts by weight in the container 100, to obtain a silicate fiber surface treatment agent;

[0020] S3. Heat the silicate fiber surface treatment agent to 40-80° C., place the silicate fiber in the silicate fiber surface treatment agent, wherein the weight of the silicate fiber accounts for 1-10% of the total weight of the silicate fiber surface treatment agent. After keeping the temperature constant for 10-30 minutes, take out the silicate fiber, clean the silicate fiber with water to obtain surface-activated silicate fiber, and a method for treating the silicate fiber with a silicate fiber surface treatment agent is completed.

[0021] The treatment method of a silicate fiber surface treatment agent described in the present invention is, as a preferred embodiment, in step S2, the pH value is adjusted to 7-8.

[0022] The method for treating a silicate fiber surface treatment agent of the present invention is preferably such that in step S3, the silicate fiber surface treatment agent is heated to 60-80°C.

[0023] The treatment method of the silicate fiber surface treatment agent of the present invention is, as a preferred mode, a method for testing the dynamic contact angle of the surface-activated silicate fiber: cutting a cardboard into a rectangular paper strip of 30 mm×10 mm, pasting the monofilament of the surface-activated silicate fiber to be tested on one side of the rectangular paper strip, cutting off the excess length of the fiber, and making one end of the surface-activated silicate fiber protrude 10 mm from the rectangular paper strip; using a dynamic contact angle meter at 0.1 mm·s ～1 The surface-activated silicate fiber was vertically inserted into the water surface at a speed of 4 mm to a depth of 5 mm. Five data points were measured per second to obtain the fiber wetting force F. The dynamic contact angle θ of the surface-activated silicate fiber was calculated according to the formula F=lγcosθ, where l is the cross-sectional circumference of the surface-activated silicate fiber and γ is the surface tension of water.

[0024] The present invention discloses a treatment method for a silicate fiber surface treatment agent. As a preferred method, the method for measuring the monofilament strength of the surface-activated silicate fiber is as follows: first, the surface-activated silicate fiber monofilament is fixed flatly on a paper frame with glue, and a hollow part with a size of 20 mm×10 mm is provided in the middle of the paper frame; after the glue is cured, the upper and lower sides of the paper frame are respectively clamped in the upper and lower clamps of a tension and compression dynamometer, and then the left and right sides of the paper frame are cut off; the tension and compression dynamometer is started, and a 10N sensor is used, and the stretching rate is 1 mm·min ～1 , until the surface-activated silicate fiber is destroyed, the tensile force when the surface-activated silicate fiber is broken is recorded to obtain the single fiber strength of the surface-activated silicate fiber.

[0025] The components and weight percentages of the silicate fiber surface treatment agent of the present invention are as follows:

[0026] 1.1-20% activator: one or more of the following combinations: catechol, pyrogallol, gallic acid, 3,4-dihydroxybenzoic acid, methyl gallate, titanium iron reagent, dopamine hydrochloride, levodopa, tea polyphenols and their derivatives. The catechol structure in the activator can react with the silanol on the surface of silicate fiber to form a complex, thereby increasing the silanol content on the fiber surface. The reaction process is shown in the attached Figure 1 .

[0027] 2.0.1-2% pH adjuster: a combination of one or more of the following: sodium hydroxide, potassium hydroxide, ammonia water, calcium hydroxide, sodium carbonate, sodium bicarbonate, calcium oxide, ethanolamine, triethylamine, which is used to adjust the pH of the solution to neutral or alkaline so that the activation reaction can occur easily.

[0028] 3. The balance is water.

[0029] (II) Preparation and processing methods

[0030] Add 1-20% by weight of an activator to a container, add water to a near total amount, stir thoroughly until the activator is completely dissolved, add a pH adjuster, adjust the pH of the system to 6-10, preferably 7-8, and add the remaining amount of water to obtain a surface treatment agent. Heat the surface treatment agent to 40-80°C, preferably 60-80°C, place silicate fibers in the surface treatment agent, the fiber weight accounts for 1-10% of the total weight of the surface treatment agent, keep the temperature constant for 10-30 minutes, take out, and clean with water to obtain surface-activated silicate fibers.

[0031] (III) Characterization methods

[0032] 1. Use the dynamic contact angle test to characterize the fiber surface activation effect. The dynamic contact angle reflects the wettability of the fiber surface. The smaller the dynamic contact angle, the higher the surface silanol content. The specific method is as follows:

[0033] The Wilhelmy balance method was used to measure the dynamic contact angle between silicate fibers and water. Figure 2 As shown in the figure, the cardboard is cut into 30mm×10mm rectangular strips, a fiber monofilament is randomly selected and pasted on one side of the strip, and the excess fiber is cut off to ensure that the length of the fiber beyond the strip is about 10mm. The speed of the fiber inserting into the water surface is set to 0.1mm·s ～1 , the insertion depth is 4mm, and 5 data points are measured per second. The fiber wetting force F is obtained, and the dynamic contact angle is calculated according to the formula F=lγcosθ, where l is the cross-sectional perimeter of the surface-activated silicate fiber, γ is the surface tension of water, and θ is the dynamic contact angle.

[0034] 2. As attached Figure 3As shown, first use 502 glue to fix the silicate fiber monofilament flatly on the paper frame, and there is a hollow part of 20mm×10mm in the middle of the paper frame. After the glue is cured, clamp the upper and lower sides of the paper frame in the upper and lower clamps of the tension and compression dynamometer, and then cut the left and right sides of the paper frame. Start the dynamometer, use a 10N sensor, and the stretching rate is 1mm·min ～1 , until the fiber is damaged, the tensile force when the single fiber is broken is recorded and statistical analysis is performed.

[0035] The present invention has the following advantages:

[0036] The present invention provides a novel silicate fiber surface treatment agent and a preparation method thereof. Compared with the prior art, the treatment agent is green and environmentally friendly, has mild reaction conditions, does not corrode equipment, can activate the fiber surface without significantly damaging the mechanical properties of the fiber itself, and increases the interface bonding strength between the silicate fiber and the polymer material; in addition, the raw material components of the sizing agent are easily available, the cost is low, the preparation method is simple, and it is easy to scale up. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The present invention is a flow chart of a treatment method of a silicate fiber surface treatment agent;

[0038] Figure 2 A schematic diagram of the surface activation process of a silicate fiber surface treatment agent and a treatment method thereof;

[0039] Figure 3 A schematic diagram of a method for measuring the dynamic contact angle of a silicate fiber surface treatment agent and a treatment method thereof;

[0040] Figure 4 The present invention is a schematic diagram of a method for measuring the single fiber strength of a silicate fiber surface treatment agent and a treatment method thereof. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] Example 1

[0043] like Figures 1 to 4 As shown, a method for preparing and using a silicate fiber surface treatment agent, in this embodiment, 8g of activator is taken, water is added to 98g, and the activator is fully stirred to completely dissolve the activator, the pH of the solution is adjusted to 7, and the remaining amount of water is added to a total weight of 100g to obtain a surface treatment agent.

[0044] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0045] In this embodiment, the surfactant is pyrogallol, the pH adjuster is a sodium hydroxide solution with a mass concentration of 5wt%, the surface treatment agent is heated to 80°C, the silicate fiber is basalt fiber, the silicate fiber weighs 10g, and the silicate fiber is left standing for 30min.

[0046] Example 2

[0047] like Figures 1 to 4 As shown, a method for preparing and using a silicate fiber surface treatment agent, in this embodiment, 8g of activator is taken, water is added to 98g, and the activator is fully stirred to completely dissolve the activator, the pH of the solution is adjusted to 7, and the remaining amount of water is added to a total weight of 100g to obtain a surface treatment agent.

[0048] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0049] In this embodiment, the surfactant selected is methyl gallate, the pH adjuster selected is sodium hydroxide solution with a mass concentration of 5wt%, the surface treatment agent is heated to 80°C, the silicate fiber is basalt fiber, the silicate fiber weighs 10g, and the silicate fiber is left standing for 30min.

[0050] Example 3

[0051] like Figures 1 to 4 As shown, a method for preparing and using a silicate fiber surface treatment agent, in this embodiment, 8g of activator is taken, water is added to 98g, and the activator is fully stirred to completely dissolve the activator, the pH of the solution is adjusted to 7, and the remaining amount of water is added to a total weight of 100g to obtain a surface treatment agent.

[0052] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0053] In this embodiment, the surfactant selected is levodopa, the pH adjuster selected is a sodium hydroxide solution with a mass concentration of 5wt%, the surface treatment agent is heated to 80°C, the silicate fiber is basalt fiber, the silicate fiber weighs 10g, and the silicate fiber is left standing for 30min.

[0054] Example 4

[0055] like Figures 1 to 4As shown, a method for preparing and using a silicate fiber surface treatment agent, in this embodiment, 8g of activator is taken, water is added to 98g, and the activator is fully stirred to completely dissolve the activator, the pH of the solution is adjusted to 7, and the remaining amount of water is added to a total weight of 100g to obtain a surface treatment agent.

[0056] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0057] In this embodiment, the surfactant is tea polyphenols, the pH adjuster is 5wt% sodium hydroxide solution, the surface treatment agent is heated to 80°C, the silicate fiber is basalt fiber, the silicate fiber weighs 10g, and the silicate fiber is left standing for 30min.

[0058] Example 5

[0059] like Figures 1 to 4 As shown, a method for preparing and using a silicate fiber surface treatment agent, in this embodiment, 8g of activator is taken, water is added to 98g, and the activator is fully stirred to completely dissolve the activator, the pH of the solution is adjusted to 7, and the remaining amount of water is added to a total weight of 100g to obtain a surface treatment agent.

[0060] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0061] In this embodiment, the surfactant is catechol, the pH adjuster is a sodium hydroxide solution with a mass concentration of 5wt%, the surface treatment agent is heated to 80°C, the silicate fiber is basalt fiber, the silicate fiber weighs 10g, and the silicate fiber is left standing for 30min.

[0062] Example 6

[0063] like Figures 1 to 4 As shown, a method for preparing and using a silicate fiber surface treatment agent, in this embodiment, 8g of activator is taken, water is added to 98g, and the activator is fully stirred to completely dissolve the activator, the pH of the solution is adjusted to 7, and the remaining amount of water is added to a total weight of 100g to obtain a surface treatment agent.

[0064] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0065] In this embodiment, the surfactant is catechol, the pH adjuster is a sodium hydroxide solution with a mass concentration of 5wt%, the surface treatment agent is heated to 60°C, the silicate fiber is basalt fiber, the silicate fiber weighs 10g, and the silicate fiber is left standing for 30min.

[0066] Example 7

[0067] like Figures 1 to 4 As shown, a method for preparing and using a silicate fiber surface treatment agent, in this embodiment, 8g of activator is taken, water is added to 98g, and the activator is fully stirred to completely dissolve the activator, the pH of the solution is adjusted to 8, and the remaining amount of water is added to a total weight of 100g to obtain a surface treatment agent.

[0068] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0069] In this embodiment, the surfactant is catechol, the pH adjuster is a sodium hydroxide solution with a mass concentration of 5wt%, the surface treatment agent is heated to 80°C, the silicate fiber is basalt fiber, the silicate fiber weighs 10g, and the silicate fiber is left standing for 30min.

[0070] Example 8

[0071] like Figures 1 to 4 As shown, a method for preparing and using a silicate fiber surface treatment agent, in this embodiment, 12g of activator is taken, water is added to 95g, and the activator is fully stirred to completely dissolve the activator, the pH of the solution is adjusted to 7, and the remaining amount of water is added to a total weight of 100g to obtain a surface treatment agent.

[0072] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0073] In this embodiment, the surfactant is catechol, the pH adjuster is a sodium hydroxide solution with a mass concentration of 5wt%, the surface treatment agent is heated to 80°C, the silicate fiber is basalt fiber, the silicate fiber weighs 10g, and the silicate fiber is left standing for 30min.

[0074] Example 9

[0075] like Figures 1 to 4 As shown, a method for preparing and using a silicate fiber surface treatment agent, in this embodiment, 16g of activator is taken, water is added to 95g, and the activator is fully stirred to completely dissolve the activator, the pH of the solution is adjusted to 7, and the remaining amount of water is added to a total weight of 100g to obtain a surface treatment agent.

[0076] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0077] In this embodiment, the surfactant is catechol, the pH adjuster is a sodium hydroxide solution with a mass concentration of 5wt%, the surface treatment agent is heated to 80°C, the silicate fiber is basalt fiber, the silicate fiber weighs 10g, and the silicate fiber is left standing for 30min.

[0078] Example 10

[0079] like Figures 1 to 4 As shown, a method for preparing and using a silicate fiber surface treatment agent, in this embodiment, 12g of activator is taken, water is added to 95g, and the activator is fully stirred to completely dissolve the activator, the pH of the solution is adjusted to 7, and the remaining amount of water is added to a total weight of 100g to obtain a surface treatment agent.

[0080] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0081] In this embodiment, the surfactant is catechol, the pH adjuster is a sodium hydroxide solution with a mass concentration of 5wt%, the surface treatment agent is heated to 80°C, the silicate fiber is basalt fiber, the silicate fiber weighs 10g, and the silicate fiber is left standing for 20min.

[0082] Comparative Example 1

[0083] Take a certain amount of surfactant and prepare 100 g of a solution with the same concentration as in Example 10, stir thoroughly to obtain a surface treatment agent. The surfactant is concentrated sulfuric acid, and the pH value of the surface treatment agent is 1.

[0084] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0085] The surface treatment agent is heated to 80° C., basalt fiber is selected as the silicate fiber, the weight of the silicate fiber is 10 g, and the standing time of the silicate fiber is 20 min.

[0086] Comparative Example 2

[0087] A certain amount of surfactant was taken to prepare 100 g of a solution with the same concentration as in Example 10, and the solution was stirred thoroughly to obtain a surface treatment agent. The surfactant was sodium hydroxide, and the pH value of the surface treatment agent was 14.

[0088] The surface treatment agent is heated, and the silicate fiber is placed in it for a certain period of time, then taken out and cleaned with water to obtain the surface activated silicate fiber.

[0089] The surface treatment agent is heated to 80° C., basalt fiber is selected as the silicate fiber, the weight of the silicate fiber is 10 g, and the standing time of the silicate fiber is 20 min.

[0090] Table 1 Surface activation effect

[0091]

[0092] As shown in Table 1, the dynamic contact angle of the untreated fiber surface is 82.20°, indicating that its hydrophilicity is average; after activation treatment, the dynamic contact angles of the fiber surface show a decrease of 20° to 40°.

[0093] Table 2 Single filament strength of activated fibers

[0094]

[0095]

[0096] It can be seen from Table 2 that the single fiber strength of Examples 7, 8, and 10 is better than that of Comparative Examples 1 and 2.

[0097] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A silicate fiber surface treatment agent, characterized in that: Including mass percentage of 1 to 20: 0.1-2: 79.9-98.9 activator, pH adjuster and water; The activator includes a catechol structure, and the catechol structure reacts with the silanol group on the surface of the silicate fiber to form a complex; The activator is: The pH value of the silicate fiber surface treatment agent is 6-10.

2. A silicate fiber surface treatment agent according to claim 1, characterized in that: The activator is any one of the following: catechol, pyrogallol, gallic acid, 3,4-dihydroxybenzoic acid, methyl gallate, titanium iron reagent, dopamine hydrochloride, levodopa, tea polyphenols and derivatives thereof.

3. A silicate fiber surface treatment agent according to claim 1, characterized in that: The pH regulator is any one of the following: sodium hydroxide, potassium hydroxide, ammonia water, calcium hydroxide, sodium carbonate, sodium bicarbonate, calcium oxide, ethanolamine and triethylamine.

4. The silicate fiber surface treatment agent according to claim 1, characterized in that: The silicate fiber is any one of the following: basalt fiber, glass fiber and ceramic fiber.

5. A method for treating silicate fiber with a surface treatment agent according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, adding 1 to 20 parts by weight of the activator into a container, and then adding water to make the total weight of the container 95 to 98.5, and stirring until the activator is completely dissolved to obtain an activator solution; S2, adding 0.1-2 parts by weight of a pH adjuster to the activator solution to adjust the pH value to 6-10, and adding a surplus of water to make the total parts by weight in the container 100, to obtain the silicate fiber surface treatment agent; S3. Heat the silicate fiber surface treatment agent to 40-80° C., place the silicate fiber in the silicate fiber surface treatment agent, wherein the weight of the silicate fiber accounts for 1-10% of the total weight of the silicate fiber surface treatment agent. After keeping the temperature constant for 10-30 minutes, take out the silicate fiber, clean the silicate fiber with water to obtain surface-activated silicate fiber, and a method for treating the silicate fiber with a silicate fiber surface treatment agent is completed.

6. The method for treating silicate fiber with a surface treatment agent according to claim 5, characterized in that: In step S2, the pH value is adjusted to 7-8.

7. The method for treating silicate fiber with a surface treatment agent according to claim 5, characterized in that: In step S3, the silicate fiber surface treatment agent is heated to 60-80°C.

8. The method for treating silicate fiber with a surface treatment agent according to claim 5, characterized in that: The dynamic contact angle test method of the surface activated silicate fiber is as follows: a cardboard is cut into a rectangular paper strip of 30 mm×10 mm, a monofilament of the surface activated silicate fiber to be tested is pasted on one side of the rectangular paper strip, and the excess length of the fiber is cut off so that one end of the surface activated silicate fiber protrudes 10 mm from the rectangular paper strip; a dynamic contact angle meter is used to measure the contact angle of the surface activated silicate fiber at a speed of 0.1 mm·s ～1 The surface-activated silicate fiber is vertically inserted into the water surface at a speed of 4 mm to a depth of 4 mm. Five data points are measured per second to obtain the fiber wetting force F. The dynamic contact angle θ of the surface-activated silicate fiber is calculated according to the formula F=lγcosθ, wherein l is the cross-sectional circumference of the surface-activated silicate fiber and γ is the surface tension of water.

9. The method for treating silicate fiber with a surface treatment agent according to claim 5, characterized in that: The method for measuring the monofilament strength of the surface-activated silicate fiber is as follows: first, the surface-activated silicate fiber monofilament is fixed flatly on a paper frame with glue, and a hollow part with a size of 20 mm×10 mm is provided in the middle of the paper frame; after the glue is cured, the upper and lower sides of the paper frame are clamped in the upper and lower clamps of the tension and compression dynamometer respectively, and then the left and right sides of the paper frame are cut off; the tension and compression dynamometer is started, a 10N sensor is used, and the stretching rate is 1mm·min ～1 , until the surface activated silicate fiber is destroyed, the tensile force when the surface activated silicate fiber is broken is recorded to obtain the single fiber strength of the surface activated silicate fiber.

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