CN106323857B - Device and method for measuring water resistance of glass fiber - Google Patents
Device and method for measuring water resistance of glass fiber Download PDFInfo
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- CN106323857B CN106323857B CN201610856859.1A CN201610856859A CN106323857B CN 106323857 B CN106323857 B CN 106323857B CN 201610856859 A CN201610856859 A CN 201610856859A CN 106323857 B CN106323857 B CN 106323857B
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Abstract
The application discloses a device and a method for measuring water resistance of glass fibers. The device for measuring the water resistance of the glass fiber comprises a first peristaltic pump, a first water conveying pipe, a first heater, a first container, a second water conveying pipe, a second peristaltic pump, a third water conveying pipe, a second heater, a second container, a fourth water conveying pipe and a third peristaltic pump; the method for measuring the water resistance of the glass fiber comprises the steps of placing a glass fiber sample in boiling water, controlling the sample amount, the volume of boiling water and the boiling water replacement rate, eliminating the influence of alkali corrosion, ensuring that the action of water on the glass fiber is always hydrolysis reaction, and finally evaluating the water resistance of the glass fiber by measuring the mass loss rate or the tensile breaking strength retention rate of monofilaments. The measuring method has the advantages of short testing time, simple operation, good repeatability and the like.
Description
Technical Field
The application relates to a device and a method for measuring water resistance of glass fibers, and belongs to the field of detection.
Background
The environment in which the glass fibers are used is unavoidable with water or vapor, and thus the water resistance of the glass fibers is an important factor to be considered. Reasonable evaluation of the change of the glass fiber in the water environment is helpful for guiding the use and development of glass fiber products. The measurement of the water resistance of glass fibers has not been reported at present. Commonly used glass or glass bottles, such as flat glass and infusion bottles, are tested for water resistance by GB/T6584-1997 methods for testing and classifying particles of glass at 98 ℃, wherein a certain sample is treated by heating in fixed amount of water for a certain time, and the alkali precipitation amount is tested. However, glass fibers are not suitable for this method because the specific surface area of the glass is far smaller than that of glass fibers, and the ion, especially alkali ion, precipitation amount when the glass fibers are contacted with water is far smaller than that of glass fibers, and if the glass fibers are measured by the method of glass water resistance, the water environment becomes alkaline due to the progress of hydrolysis reaction, further alkali corrosion occurs, and the measurement result cannot be simply defined as water resistance. Therefore, it is necessary to establish a suitable assay for evaluating the water resistance of different glass fibers.
Disclosure of Invention
Aiming at the problems that the corrosion of water to glass fiber is slow relative to acid and alkali, the normal temperature test is long in time consumption, and the water environment is easy to change due to the exchange of cations in the glass fiber and hydrogen ions in the water, and the water resistance of the glass fiber cannot be accurately reflected by a single water boiling test, the application provides the device and the method for measuring the water resistance of the glass fiber, which are high in accuracy and simple to operate.
In order to solve the technical problems, the technical scheme adopted by the application is as follows:
the device for measuring the water resistance of the glass fiber comprises a first peristaltic pump, a first water conveying pipe, a first heater, a first container, a second water conveying pipe, a second peristaltic pump, a third water conveying pipe, a second heater, a second container, a fourth water conveying pipe and a third peristaltic pump; the first container is arranged on the first heater; the second container is arranged on the second heater; the first peristaltic pump, the second peristaltic pump and the third peristaltic pump are respectively provided with a water outlet and a water inlet; one end of the first water pipe is communicated with a water outlet on the first peristaltic pump, and the other end of the first water pipe extends into the first container; one end of the second water pipe extends into the first container, and the other end of the second water pipe is communicated with a water inlet of the second peristaltic pump; one end of the third water pipe is communicated with the water outlet of the second peristaltic pump, and the other end of the third water pipe extends into the second container; one end of the fourth water pipe extends into the second container, and the other end of the fourth water pipe is communicated with the water outlet of the third peristaltic pump.
In order to reduce the cost and facilitate the operation, the first container is a flask, and the second container is a beaker.
The first container of the present application is intended to provide a continuous supply of boiling water to the second container.
In order to facilitate the introduction of water in the first container, one end of the first water delivery pipe is communicated with the water outlet on the first peristaltic pump, and the other end of the first water delivery pipe stretches into the first container and is positioned at the top position in the first container.
In order to facilitate the extraction of water in the first container and the introduction of water in the second container, one end of the second water pipe extends into the inner bottom of the first container, and the other end of the second water pipe is communicated with the water inlet of the second peristaltic pump; one end of the third water pipe is communicated with the water outlet of the second peristaltic pump, and the other end of the third water pipe extends into the bottom of the second container.
In order to reduce cost and facilitate operation, the first heater and the second heater are adjustable electric furnaces.
The use of the device for measuring the water resistance of the glass fiber comprises the following steps:
a. before the experiment, firstly, building up each component of the device, preparing enough experimental water, communicating with a water inlet of a first peristaltic pump, heating water in a flask to be boiled, placing a first water pipe (used for water inflow) in the flask into a bottle mouth, and inserting a second water pipe (used for water outflow) into the boiling water;
b. inserting a second water delivery pipe (for water outlet) of the flask to the bottom of the reaction beaker as much as possible, and enabling a fourth water delivery pipe (for water outlet) of the reaction beaker to be as close to the upper liquid level as possible;
c. all the adjustable electric furnaces are opened to high temperature to keep water in a boiling state, the flow of the peristaltic pump is adjusted, the water inlet and outlet are ensured to be consistent, and the pH value of the water in the beaker is kept to be less than or equal to 7.0.
The device thoroughly solves the problem that the environmental change caused by hydrolysis and alkali corrosion are easy to occur when the water resistance of the glass fiber is tested, so that the test result cannot react with the water resistance. In addition, the device is simple and convenient and has strong operability.
The method for measuring the water resistance of the glass fiber by using the measuring device for the water resistance of the glass fiber comprises the following steps of:
(1) Adding water into the first container and the second container respectively, boiling, and continuously heating by the first heater and the second heater respectively to keep the water in the first container and the second container slightly boiling;
(2) Removing the impregnating compound from the glass fiber;
(3) Placing the glass fibers obtained in the step (2) into boiling water in a second container, stirring to uniformly disperse the glass fibers, reacting for 6 hours plus or minus 10 minutes, and adjusting the water flow speeds of a first peristaltic pump, a second peristaltic pump and a third peristaltic pump in the reaction process to ensure that the pH value in the second container is less than or equal to 7.0;
(4) Cooling the material obtained in the step (3) to room temperature;
(5) And (3) carrying out suction filtration, washing, drying and cooling on the material obtained in the step (4) to room temperature by using a sintering filter, weighing to calculate the mass loss rate or the mass loss quantity per unit surface area, and/or measuring the tensile breaking strength of the monofilament to calculate the retention rate of the tensile breaking strength of the monofilament.
In the measurement, the glass fiber in the step (2) is cut into small sections in advance. In the reaction in the step (3), the water in the second container is kept in a boiling or micro-boiling state. In step (4), the cooling is preferably effected rapidly with ice water. In the step (5), the sintered filter needs to be washed for 2-7 times by hot water (water with the temperature of more than or equal to 50 ℃). The tensile breaking strength measurement of the filaments in the step (5) is carried out according to the method specified in GB/T31290. The micro-boiling of the application may also be boiling.
In the step (1), the water in the first container and the second container is heated to be boiled in advance, so that the conditions of the glass fiber and the water are unified, and the glass fiber is fully dispersed and is ensured to be fully contacted with the water.
The method adopts the first peristaltic pump, the second peristaltic pump, the third peristaltic pump, the first heater and the second heater to ensure that water is in a boiling flowing state, and the pH value of water in the second container is kept to be not more than 7.0.
In order to further improve the feasibility of the measurement, the method for removing the impregnating compound in the step (2) comprises the steps of firstly soaking with acetone and then washing with absolute ethyl alcohol; the mass ratio of the glass fiber in the step (3) to the boiling water in the second container is 1: (250-350).
The acetone may be other organic solvents having a higher polarity.
In order to further improve the accuracy of the measurement, the step (5) is performed in a constant temperature drying oven at 105+/-2 ℃, dried to constant weight, and then transferred into a dryer to be cooled to room temperature.
When the retention rate of the tensile breaking strength of the monofilaments is calculated, the glass fibers are required to be removed of the impregnating compound in the step (2), and then two tests are carried outMeasuring the tensile breaking strength F of the monofilament after sequentially carrying out the steps (3) - (5) on one sample 2 Another sample directly measures the tensile breaking strength F of a monofilament 1 The retention of tensile strength delta of the monofilament is
In order to further improve the accuracy of the measurement, the method for measuring the water resistance of the glass fiber comprises the following steps of:
(1) Adding water into the first container and the second container respectively, boiling, and continuously heating by the first heater and the second heater respectively to keep the water in the first container and the second container slightly boiling;
(2) Cutting continuous fibers into long sections with the length of 250mm, removing impregnating compound, cutting small sections with the length of 100mm plus or minus 0.5mm, drying to constant weight, and taking two samples, namely a sample A and a sample B, from the obtained fibers;
(3) Weighing the mass of the B samples to be m (g), placing the B samples into boiling water in a second container, stirring to uniformly disperse glass fibers, reacting for 6 hours plus or minus 10 minutes, and adjusting the water flow speeds of a first peristaltic pump, a second peristaltic pump and a third peristaltic pump in the reaction process to ensure that the pH value in the second container is less than or equal to 7.0, wherein one end of a third water pipe is communicated with a water outlet of the second peristaltic pump, and the other end of the third water pipe extends into the inner bottom of the second container; one end of the fourth water pipe extends into the second container below the liquid level and is as close to the liquid level as possible (2-8 mm below the liquid level), and the other end of the fourth water pipe is communicated with the water outlet of the third peristaltic pump;
(4) Cooling the material obtained in the step (3) to room temperature;
(5) Filtering the material obtained in the step (4) by a constant weight sintered filter, and washing the fiber for 3-4 times by hot water, wherein the mass of the constant weight sintered filter is m 1 (g)；
(6) Drying the sintered filter with the sample obtained in the step (5) to constant weight in a constant temperature drying oven at 105+/-2 ℃, transferring into a dryer to cool to room temperature, weighing and recording as m 2 (g) Mass loss rate ω for mass loss or unit mass loss amount ω A Represents the mass loss per unit surface area omega A The glass fiber density ρ (g/m) is measured in advance 3 ) Diameter d (μm) and length L (mm):
(7) The maximum tensile load of the filaments of the A-type sample and the B-type sample subjected to the steps (3) to (6) was measured according to the specification of GB/T31290 and was recorded as the filament tensile breaking strength, and the filament tensile breaking strength of the A-type sample was F 1 The filament tensile breaking strength of the B samples subjected to the steps (3) - (6) is F 2 Not less than 20 data were measured for each sample, and then the average was taken, so that the tensile strength retention of filament, δ, was:
a length of 250mm, about 20g,
the method for removing the impregnating compound in the step (1) comprises the following steps: placing the fiber in an organic solvent containing acetone or other soluble impregnating compound, sealing and soaking for at least 24 hours, and then washing with absolute ethyl alcohol for 3-4 times.
In order to improve the accuracy of the measurement, more than 2 parts of the sample A and the sample B can be taken respectively, and the sample A does not need hydrolysis reaction, namely, the tensile breaking strength of the monofilaments is directly measured after the sample is taken in the step (2).
And (3) the pH value in the step (3) can be sampled and tracked at the water outlet of the third peristaltic pump at regular time, and if the pH value is bigger, the water flow speed of the peristaltic pump can be accelerated to retest.
The unit of the mass is g.
The technology not mentioned in the present application refers to the prior art.
The device and the method for measuring the water resistance of the glass fiber fill the blank of measuring the water resistance of the glass fiber, and have the advantages of short testing time, simplicity in operation, good repeatability and the like; according to the application, the peristaltic pump and the heater are adopted to ensure that water is in a boiling flowing state, and the pH value of the glass fiber and the water is kept not more than 7.0 when the glass fiber and the water act, so that the glass fiber and the water act as hydrolysis reaction all the time, and the test result is accurately represented as water resistance; further, the glass fiber is cut into small sections in advance, so that testing errors caused by scattering of the glass fiber in the weighing process can be effectively prevented; the application has low cost and strong realizability.
Brief description of the drawings
FIG. 1 is a schematic view of the structure of a device for measuring the water resistance of a glass fiber according to the present application.
In the figure, a first peristaltic pump 1, a first water conveying pipe 2, a first adjustable electric furnace 3, a flask 4, a second water conveying pipe 5, a second peristaltic pump 6, a third water conveying pipe 7, a second adjustable electric furnace 8, a beaker 9, a fourth water conveying pipe 10, a third peristaltic pump 11, glass fibers 12, and water inflow 13 and water outflow 14.
Detailed Description
For a better understanding of the present application, the following examples are further illustrated, but are not limited to the following examples.
As shown in FIG. 1, the measuring device for the water resistance of the glass fiber used in each embodiment comprises a first peristaltic pump, a first water pipe, a first adjustable electric furnace, a flask, a second water pipe, a second peristaltic pump, a third water pipe, a second adjustable electric furnace, a beaker, a fourth water pipe and a third peristaltic pump; placing the flask on a first adjustable electric furnace; placing the beaker on a second adjustable electric furnace; the first peristaltic pump, the second peristaltic pump and the third peristaltic pump are respectively provided with a water outlet and a water inlet; one end of the first water pipe is communicated with a water outlet on the first peristaltic pump, and the other end of the first water pipe extends into the flask and is positioned at an inlet position in the flask; one end of the second water pipe extends into the bottom of the flask, and the other end of the second water pipe is communicated with a water inlet of the second peristaltic pump; one end of the third water pipe is communicated with the water outlet of the second peristaltic pump, and the other end of the third water pipe extends into the bottom of the beaker; one end of the fourth water pipe extends into the beaker, and the other end of the fourth water pipe is communicated with the water outlet of the third peristaltic pump.
The method for measuring the water resistance of the glass fiber by using the measuring device for the water resistance of the glass fiber comprises the following steps of:
(1) Adding water into the flask and the beaker respectively, boiling, and continuously heating by using a first adjustable electric furnace and a second adjustable electric furnace respectively to keep the water in the flask and the beaker slightly boiling;
(2) Cutting continuous fibers into long sections of 250mm, about 20g, placing the long sections in 700mL of acetone, sealing and soaking for 26 hours, washing the long sections with absolute ethyl alcohol for 4 times, cutting small sections with the length of 100mm, drying the small sections to constant weight, and taking two samples, namely a sample and a sample B from the obtained fibers;
(3) Weighing the mass of the B samples to be m (g), placing the B samples into boiling water (600 mL, pH 6-7) in a beaker, stirring to uniformly disperse glass fibers, reacting for 6 hours, and adjusting the water flow speeds of a first peristaltic pump, a second peristaltic pump and a third peristaltic pump in the reaction process to ensure that the pH value in the beaker is less than or equal to 7.0, wherein one end of a third water pipe is communicated with a water outlet of the second peristaltic pump, and the other end of the third water pipe extends into the bottom in the beaker; one end of the fourth water pipe extends into the liquid level in the beaker and is close to the liquid level as much as possible (5 mm below the liquid level), and the other end of the fourth water pipe is communicated with the water outlet of the third peristaltic pump;
(4) Cooling the material obtained in the step (3) to room temperature;
(5) Filtering the material obtained in the step (4) by a constant weight sintered filter, and washing the fiber for 4 times by hot water at 60 ℃, wherein the constant weight sintered filter has the mass of m 1 (g)；
(6) Drying the sintered filter with the sample obtained in the step (5) to constant weight in a constant temperature drying oven at 105+/-2 ℃, transferring into a dryer to cool to room temperature, weighing and recording as m 2 (g) Mass loss rate ω or mass loss per unit surface area ω A Represents the mass loss per unit surface area omega A The glass fiber density ρ (g/m) is measured in advance 3 ) Diameter d (μm) and length L (mm):
(7) The maximum tensile load of the filaments of the A-type sample and the B-type sample subjected to the steps (3) to (6) was measured according to the specification of GB/T31290 and was recorded as the filament tensile breaking strength, and the filament tensile breaking strength of the A-type sample was F 1 And (3) measuring not less than 20 data of each sample by using the tensile breaking strength F2 of the monofilaments of the B samples subjected to the steps (3) - (6), and taking the average value, wherein the tensile breaking strength retention delta of the monofilaments is as follows:
example 1
Measurement of Water resistance of Medium alkali glass fiber (CC 13-4800) produced by Feilong glass fiber composite Co., ltd. In Mashan, density of 2.54g/m 3 The diameter is 15 μm; two parallel samples were taken for the B samples, the mass being m= 1.9283g and m' = 2.3293g, respectively; the sintered filters with constant weights in the step (5) are respectively m 1 ＝94.7317g，m 1 ' = 90.3650g; the mass sum of the sintered filter and the sample dried to constant weight in the step (6) is m respectively 2 ＝96.6537g，m 2 ' = 92.6863g; the flow rate of water inlet and outlet of the first peristaltic pump, the second peristaltic pump and the third peristaltic pump is 40mL/min;
the mass loss rates of two parallel samples taken from the sample B are respectively as follows:
the mass loss per unit surface area is:
(2) The tensile breaking strength data of the monofilaments were measured as follows:
the pH value of the water in the reaction process is monitored to be 6.30-6.40.
Example 2
Determination of the Water resistance of alkali-free glass fiber the alkali-free glass fiber (E150-2400) used was produced by Shanghai Kogyo Co., ltd and had a density of 2.6g/m 3 A diameter of 23.9 μm; two parallel samples were taken for the B samples, the mass being m= 2.3242g and m' = 2.0041g, respectively; the sintered filters with constant weights in the step (5) are respectively m 1 ＝93.9554g，m 1 ' = 93.2446g; the mass sum of the sintered filter and the sample dried to constant weight in the step (6) is m respectively 2 ＝96.2693g，m 2 ' = 95.2400g; the flow rate of water inlet and outlet of the first peristaltic pump, the second peristaltic pump and the third peristaltic pump is 30mL/min;
the mass loss rate of two parallel samples taken from the sample B is as follows:
the mass loss per unit surface area is:
(2) The tensile breaking strength data of the monofilaments were measured as follows:
the pH value of the water in the reaction process is monitored to be 6.60-6.70.
Example 3
Determination of the Water resistance of alkali-resistant glass fiber the alkali-resistant glass fiber (ARC 13-2400) used was produced by Huaying glass fiber plant in Pei county and had a density of 2.8g/m 3 Diameter of 13.2 μm; two parallel samples were taken for the B samples, the mass being m= 2.0254g and m' = 2.0013g, respectively; the sintered filters with constant weights in the step (5) are respectively m 1 ＝94.7236g，m 1 ' = 93.9583g; the mass sum of the sintered filter and the sample dried to constant weight in the step (6) is m respectively 2 ＝96.7254g，m 2 ' = 95.9565g; the flow rate of water inlet and outlet of the first peristaltic pump, the second peristaltic pump and the third peristaltic pump is 30mL/min;
the mass loss rate of two parallel samples taken from the sample B is as follows:
the mass loss per unit surface area is:
(2) The tensile breaking strength data of the monofilaments were measured as follows:
the pH value of the water in the reaction process is monitored to be 6.40-6.50.
The glass fiber can generate hydrolysis reaction after being contacted with water, polar groups on the surface of the glass fiber can combine with hydrogen in water molecules, and cations such as sodium, calcium and the like in the network structure of the glass fiber are also subjected to ion exchange with the hydrogen in the water molecules. The extent of the hydrolysis reaction can severely affect the physical and chemical properties of the glass fibers. Because the hydrolysis byproduct hydroxyl can seriously corrode the glass fiber, the accurate determination of the water resistance of the glass fiber depends on the stability of water in a determination environment. The larger the influence of hydrolysis on glass fiber, the larger the mass loss, and the smaller the retention rate of tensile breaking strength of the monofilament, and compared with the traditional water resistance test method for measuring the mass loss after the constant water boiling, the method provided by the application is more scientific and more accurate, and is as follows: the mass loss rate of the medium alkali glass fiber in the example is 0.33%, the tensile breaking strength retention rate of the monofilament is 86.06%, the mass loss rate of the traditional fixed and invariable water boiling is 1.01%, the tensile breaking strength retention rate of the monofilament is 78.30%, and the pH value of water is=10, so that the traditional method cannot avoid the influence of alkali corrosion, the deviation of the test result is larger, and the water resistance of the glass fiber cannot be accurately described. In a word, the device for measuring the water resistance of the glass fiber designed by the method can maintain a stable water phase environment, ensures that only hydrolysis reaction occurs when the glass fiber contacts water, and accurately shows the water resistance of the glass fiber by using the mass loss rate, the mass loss quantity of unit surface area and the tensile breaking strength retention rate of monofilaments.
Claims (10)
1. A measuring device for the water resistance of glass fiber is characterized in that: the peristaltic pump comprises a first peristaltic pump, a first water conveying pipe, a first heater, a first container, a second water conveying pipe, a second peristaltic pump, a third water conveying pipe, a second heater, a second container, a fourth water conveying pipe and a third peristaltic pump; the first container is arranged on the first heater; the second container is arranged on the second heater; the first peristaltic pump, the second peristaltic pump and the third peristaltic pump are respectively provided with a water outlet and a water inlet; one end of the first water pipe is communicated with a water outlet on the first peristaltic pump, and the other end of the first water pipe extends into the first container; one end of the second water pipe extends into the first container, and the other end of the second water pipe is communicated with a water inlet of the second peristaltic pump; one end of the third water pipe is communicated with the water outlet of the second peristaltic pump, and the other end of the third water pipe extends into the second container; one end of the fourth water pipe extends into the second container, and the other end of the fourth water pipe is communicated with the water outlet of the third peristaltic pump; in the reaction process, the water flow speeds of the first peristaltic pump, the second peristaltic pump and the third peristaltic pump are regulated to ensure that the pH value in the second container is less than or equal to 7.0.
2. The apparatus for measuring water resistance of glass fiber according to claim 1, wherein: the first container is a flask and the second container is a beaker.
3. The measurement device for water resistance of glass fiber according to claim 1 or 2, wherein: one end of the first water pipe is communicated with a water outlet on the first peristaltic pump, and the other end of the first water pipe extends into the first container and is positioned at the top position in the first container.
4. The measurement device for water resistance of glass fiber according to claim 1 or 2, wherein: one end of the second water pipe extends into the inner bottom of the first container, and the other end of the second water pipe is communicated with a water inlet of the second peristaltic pump; one end of the third water pipe is communicated with the water outlet of the second peristaltic pump, and the other end of the third water pipe extends into the bottom of the second container.
5. The measurement device for water resistance of glass fiber according to claim 1 or 2, wherein: the first heater and the second heater are adjustable electric furnaces.
6. A method for measuring the water resistance of a glass fiber by using the measuring apparatus for the water resistance of a glass fiber according to any one of claims 1 to 5, characterized in that: the method comprises the following steps of:
(1) Adding water into the first container and the second container respectively, boiling, and continuously heating by the first heater and the second heater respectively to keep the water in the first container and the second container slightly boiling;
(2) Removing the impregnating compound from the glass fiber;
(3) Placing the glass fibers obtained in the step (2) into boiling water in a second container, stirring to uniformly disperse the glass fibers, reacting for 6 hours plus or minus 10 minutes, and adjusting the water flow speeds of a first peristaltic pump, a second peristaltic pump and a third peristaltic pump in the reaction process to ensure that the pH value in the second container is less than or equal to 7.0;
(4) Cooling the material obtained in the step (3) to room temperature;
(5) And (3) carrying out suction filtration, washing, drying and cooling on the material obtained in the step (4) to room temperature by using a sintering filter, weighing to calculate the mass loss rate and/or the mass loss rate per unit surface area, and/or measuring the tensile breaking strength of the monofilaments to calculate the retention rate of the tensile breaking strength.
7. The method for measuring the water resistance of glass fibers according to claim 6, wherein: the method for removing the impregnating compound in the step (2) comprises the steps of firstly soaking with acetone and then washing with absolute ethyl alcohol; the mass ratio of the glass fiber in the step (3) to the boiling water in the second container is 1: (250-350).
8. The method for measuring the water resistance of glass fibers according to claim 6 or 7, wherein: and (3) drying in the step (5) to constant weight in a constant temperature drying oven at 105+/-2 ℃, and then transferring the dried product into a dryer to cool the product to room temperature.
9. The method for measuring the water resistance of glass fibers according to claim 6 or 7, wherein: when calculating the retention rate of the tensile breaking strength of the monofilaments, after the glass fiber is removed from the impregnating compound in the step (2), two samples are taken, and one sample is sequentially subjected to the steps (3) - (5) to determine the tensile breaking strength F of the monofilaments 2 Another sample directly measures the tensile breaking strength F of a monofilament 1 The retention of tensile strength delta of the monofilament is
10. The method for measuring the water resistance of glass fibers according to claim 6 or 7, wherein: the method comprises the following steps of:
(1) Adding water into the first container and the second container respectively, boiling, and continuously heating by the first heater and the second heater respectively to keep the water in the first container and the second container slightly boiling;
(2) Cutting continuous fibers into long sections with the length of 250mm, removing impregnating compound, cutting small sections with the length of 100mm plus or minus 0.5mm, drying to constant weight, and taking two samples, namely a sample A and a sample B, from the obtained fibers;
(3) Weighing the mass of the B samples to be m and g, placing the B samples in boiling water in a second container, stirring to uniformly disperse glass fibers, reacting for 6 hours plus or minus 10 minutes, and adjusting the water flow speeds of a first peristaltic pump, a second peristaltic pump and a third peristaltic pump in the reaction process to ensure that the pH value in the second container is less than or equal to 7.0, wherein one end of a third water pipe is communicated with a water outlet of the second peristaltic pump, and the other end of the third water pipe extends into the inner bottom of the second container; one end of the fourth water pipe extends into the second container by 2-8mm below the liquid level, and the other end of the fourth water pipe is communicated with the water outlet of the third peristaltic pump;
(4) Cooling the material obtained in the step (3) to room temperature;
(5) Filtering the material obtained in the step (4) by using a constant-weight sintered filterAt the same time, the fiber is washed 3 to 4 times by water with the temperature of more than or equal to 50 ℃, wherein the mass of the constant weight sintered filter is m 1 Unit g;
(6) Drying the sintered filter with the sample obtained in the step (5) to constant weight in a constant temperature drying oven at 105+/-2 ℃, transferring into a dryer to cool to room temperature, weighing and recording as m 2 Mass loss rate ω for mass loss per g or mass loss amount ω per unit mass A Represents the mass loss per unit surface area omega A The density ρ of the glass fiber in g/m is measured in advance 3 Diameter d, unit μm and length L, unit mm:
(7) The maximum tensile load of the filaments of the A-type sample and the B-type sample subjected to the steps (3) to (6) was measured according to the specification of GB/T31290 and was recorded as the filament tensile breaking strength, and the filament tensile breaking strength of the A-type sample was F 1 The filament tensile breaking strength of the B samples subjected to the steps (3) - (6) is F 2 Not less than 20 data were measured for each sample, and then the average was taken, so that the tensile strength retention of filament, δ, was:
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