Method for evaluating strength of glass fiber cotton based on hydraulic shearing method

Abstract

The invention discloses a method for evaluating the strength of glass fiber cotton based on a hydraulic shearing method, which comprises the following steps: step 1, pretreating raw materials; step 2, hydraulic shearing treatment; 3, fiber forming treatment; 4, retention rate calculation: measuring the mass of fibers intercepted on the filter screen, and calculating the retention rate according to a formula, the retention rate R = (m1 / m0) * 100%; and step 5, strength judgment. According to the method, destructive detection such as tensile test in the prior art is replaced by a quantitative standard hydraulic shearing method and retention rate quality measurement, complex working conditions such as fluid impact and chemical corrosion are simulated through eddy current rotation, the standard of quality grade is quantified, the hydraulic shearing environment in the actual working condition is simulated through the method, and the working efficiency is improved. The strength of the glass fiber is reflected through the fiber retention rate, and compared with traditional purchased equipment and manual detection, the detection cost is reduced by 95%.

Description

Technical Field

[0001] This invention relates to the field of mechanical property characterization technology for inorganic non-metallic materials, and in particular to a method for testing the shear strength of glass fiber wool that combines fluid boundary layer shear theory with a statistical model of fiber mass retention rate. This method is applicable to quality testing in fields such as mineral wool products and high-temperature insulation materials. Background Technology

[0002] The core value of glass fiber lies in its high strength, high modulus, corrosion resistance, and insulation properties. It is commonly used for structural reinforcement of automotive parts, ship hulls, and blades, as well as for fire and corrosion protection in building materials. Quality defects in glass fiber can lead to serious consequences such as structural failure, fire risk, and electrical accidents.

[0003] In existing technologies, traditional methods for testing the quality of glass fibers mainly rely on observing fiber morphology using scanning electron microscopy or using specialized fiber analysis instruments, such as the FQA fiber quality analyzer, but these methods have the following drawbacks:

[0004] 1. The purchase of testing equipment is expensive, with the price of a single unit exceeding 500,000 yuan;

[0005] 2. Requires professional technicians to operate and has a long testing cycle (approximately 2-3 hours per test);

[0006] 3. Fiber quality analyzers cannot directly provide data characterizing the strength of glass fibers; they can only infer fiber properties based on morphology, size, and other factors. Summary of the Invention

[0007] The purpose of this invention is to provide a method for evaluating the strength of glass fiber wool based on the hydraulic shear method, which has the advantages of low cost and quick and convenient testing.

[0008] The above-mentioned technical objective of this invention is achieved through the following technical solution: a method for evaluating the strength of glass fiber wool based on the hydraulic shear method, comprising the following steps,

[0009] Step 1: Raw material pretreatment: Take a glass fiber wool sample and disperse it in a liquid to form a suspension;

[0010] Step 2, Hydraulic Shearing Treatment: Place the suspension into a mixer and start the mixer to perform the shearing treatment. The specific speed and mixing time can be set according to different fibers. Preferably, hydraulic shearing is performed at a speed of 1000-30000 rpm for 1-10 minutes.

[0011] Step 3, Fiber forming process: The suspension after hydraulic shearing in step 2 is vacuum filtered through a filter screen;

[0012] Step 4: Calculation of retention rate: Determine the mass of fiber trapped on the filter screen and calculate the retention rate according to the formula: Retention rate R = (m1 / m0) * 100%, (m0 is the initial mass of the glass fiber cotton sample in Step 1, and m1 is the mass trapped after filtration in Step 3).

[0013] Step 5, Strength Determination: The shear strength of glass fiber raw materials is evaluated by comparing retention rates. Under the same conditions, the higher the retention rate of the fiber, the higher its shear strength.

[0014] Establish a retention rate-strength correspondence database to classify the strength of glass fiber cotton into grades, thereby assessing the quality and aging degree of glass fiber raw materials.

[0015] Preferably, in step one, the glass fiber cotton sample is 5-15g, and the liquid in step one is water with a volume of 1000ml-2000ml.

[0016] By adopting the above technical solution and using water as the experimental fluid medium, the overall experimental cost is reduced, while the experimental risk is also reduced.

[0017] Preferably, the glass fibers in the glass fiber wool have a diameter of 0.2 μm to 5 μm and a length of 1 mm to 15 mm.

[0018] By adopting the above technical solution, this method is applicable to the glass fiber size of glass fiber wool in most industrial products.

[0019] Preferably, the glass fiber wool sample in step one can be replaced with asbestos and ceramic wool of the same shape and size.

[0020] By adopting the above technical solution, it is applicable to the evaluation of various structurally similar fiber materials.

[0021] Preferably, sulfuric acid is added to the liquid to adjust the pH value of the liquid in step one to 1-4.

[0022] By employing the above technical solution, in an acidic environment (pH < 4), the silica (SiO2) groups on the surface of the glass fiber undergo a protonation reaction to form positively charged silanol groups (Si-OH2). + This increased surface positive charge density generates strong electrostatic repulsion between fibers, effectively preventing fiber aggregation. Experiments show that when the pH value drops to 2, the Zeta potential of the fiber dispersion system can reach over +25mV, which is much higher than the critical aggregation potential (usually ±15mV), thus maintaining a stable dispersion state and improving the overall dispersion effect.

[0023] Preferably, the mesh size of the filter screen in step three is 100-500 mesh.

[0024] By adopting the above technical solution, different filter mesh sizes can be selected according to different glass fiber sizes.

[0025] Preferably, the filter screen has a mesh size of 150 and is made of polyester mesh.

[0026] By adopting the above technical solutions, the versatility is enhanced, and the strength and durability are combined to ensure the reliability of vacuum filtration.

[0027] Preferably, the retained fibers after vacuum filtration in step three are dried.

[0028] By adopting the above technical solution, the influence of residual moisture after filtration on the measurement results of m1 mass is avoided, and the accuracy of retention rate R is improved.

[0029] Preferably, the strength in the method includes the comprehensive damage resistance under dynamic wet conditions, encompassing shear strength, aging resistance, and water absorption resistance.

[0030] By adopting the above technical solution, this method detects the overall performance, not the performance of a single dimension, which is also a result that cannot be detected by the appearance of the glass fiber alone.

[0031] As a preferred option, the step five described n≥1.

[0032] By adopting the above technical solution, depending on the accuracy of R, it is convenient to classify the quality more accurately, for example, classifying it into tens, hundreds, or thousands digits as needed.

[0033] In summary, this method replaces destructive testing methods such as tensile testing in existing technologies by using a quantitative standard hydraulic shear method and a quality measurement of fiber retention rate. It also simulates complex working conditions such as fluid impact and chemical corrosion through eddy current rotation, thus quantifying the standard of quality grade. By simulating the hydraulic shear environment in actual working conditions through the above methods, the strength of glass fiber is reflected by the fiber retention rate. Compared with the traditional method of purchasing equipment and manual testing, the testing cost is reduced by 95%. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the detection process in an embodiment;

[0035] Figure 2 This is an image of the sample from step one of the embodiments;

[0036] Figure 3 This is an image of the vacuum filtration process in step four of the embodiment; Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings.

[0038] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0039] To ensure reproducibility of performance, the stirrer model disclosed is Qihe KS-767Ⅱ. The glass fiber sample was prepared before processing as follows: Figure 2 As shown, the glass fiber sample after hydraulic shearing is as follows: Figure 3 As shown, the same glass fiber wool sample can be replaced with asbestos and ceramic wool of the same shape and size; as Figure 1 The diagram shows the overall process flow, applied to Examples 1-35, which is a method for evaluating the strength of glass fiber wool based on the hydraulic shear method, including the following steps:

[0040] Step 1: Raw material pretreatment: Take 10±0.1g of glass fiber cotton sample and disperse it in 1000ml-2000ml of liquid (water) to form a suspension. Sulfuric acid can be added to the liquid to adjust the pH value of the liquid in Step 1 to 2.5±0.1.

[0041] Step 2, Hydraulic shearing treatment: Place the suspension in a stirrer and perform hydraulic shearing at a speed of 1500-30000 rpm for 3-10 minutes.

[0042] Step 3, Fiber forming process: The suspension after hydraulic shearing in step 2 is vacuum filtered through a filter screen. The retained fibers after vacuum filtration can be dried.

[0043] Step 4: Calculation of retention rate: Determine the mass of fiber trapped on the filter screen and calculate the retention rate according to the formula: Retention rate R = (m1 / m0) * 100%, (m0 is the initial mass of the glass fiber cotton sample in Step 1, and m1 is the mass trapped after filtration in Step 3).

[0044] Step 5: Strength Determination: Establish a retention rate-strength correspondence database to classify the strength of glass fiber cotton into grades, in order to evaluate the quality and aging degree of glass fiber raw materials.

[0045] The method incorporates strengths including shear strength, aging resistance, and water absorption resistance, representing a comprehensive resistance to damage under dynamic wet conditions; simultaneously, step five... n≥1.

[0046] In Examples 1 to 35, the glass fiber cotton has a diameter of 0.2 μm to 5 μm and a length of 1 mm to 15 mm. In step one, the addition of sulfuric acid to the liquid is not a necessary condition; the sulfuric acid serves to adjust the pH value of the liquid in step one to 2.5 ± 0.1.

[0047] The mesh size of the filter screen is 100-500 mesh, selected according to the type and fineness of the fiber. In Examples 1 to 10, a 100-mesh polyester screen was used, the stirring time was 3 minutes, the speed was 10,000 rpm, and the stirring concentration was 1%. In Examples 11 to 20, a 150-mesh polyester filter screen was used, the stirring time was 5 minutes, the speed was 30,000 rpm, and the stirring concentration was 1%. In Examples 21 to 35, a 100-mesh polyester filter screen was used, the stirring time was 4 minutes, the speed was 10,000 rpm, and the stirring concentration was 1%.

[0048] Examples 1 to 5 used glass fiber cotton samples of the same specifications from Manufacturer A, with a diameter of 0.2 μm and a length of 1 mm. Examples 6 to 10 used glass fiber cotton samples of the same specifications from Manufacturer B. The retention rate and grade (n=2) are as follows, used to demonstrate the testing and rating of samples from the same batch from different manufacturers:

[0049]

[0050] Examples 11 to 20 used glass fiber wool samples of the same specification with a diameter of 2μm and a length of 10mm, and the storage time was 1 month. Examples 6 to 10 used glass fiber wool samples of the same specification from the same manufacturer and the storage time was 15 months. These were used to evaluate the effect of storage time on the strength grade of the same specification. The retention rate and grade (n=2) are as follows:

[0051]

[0052] Examples 21 to 35 used glass fiber wool samples of the same specification with a diameter of 5μm and a length of 15mm. Examples 6 to 10 used glass fiber wool samples of the same specification from the same manufacturer. These were used to evaluate the differences in strength grades between different batches from the same supplier. The retention rate and grade (n=2) are as follows:

[0053]

[0054]

Claims

1. A method for evaluating the strength of glass fiber wool based on the hydraulic shear method, characterized in that: Includes the following steps, Step 1: Raw material pretreatment: Take a glass fiber cotton sample and disperse it in a liquid to form a suspension; Step 2, Hydraulic shearing treatment: Place the suspension into the agitator and turn on the agitator to perform shearing treatment. The specific speed and agitation time can be set according to different fibers. Step 3, Fiber forming process: The suspension after hydraulic shearing in step 2 is vacuum filtered through a filter screen; Step 4: Calculation of retention rate: Determine the mass of fiber trapped on the filter screen and calculate the retention rate according to the formula: Retention rate R = (m1 / m0) * 100%, (m0 is the initial mass of the glass fiber cotton sample in Step 1, and m1 is the mass trapped after filtration in Step 3). Step 5, Strength Determination: The shear strength of glass fiber raw materials is evaluated by comparing retention rates. Under the same conditions, the higher the retention rate of the fiber, the higher its shear strength.

2. The method for evaluating the strength of glass fiber wool based on the hydraulic shear method according to claim 1, characterized in that: In step one, the glass fiber cotton sample is 5-15g, and the liquid in step one is water with a volume of 1000ml-2000ml.

3. The method for evaluating the strength of glass fiber wool based on the hydraulic shear method according to claim 1, characterized in that: The glass fiber in the glass fiber wool has a diameter of 0.2μm to 5μm and a length of 1mm to 15mm.

4. The method for evaluating the strength of glass fiber wool based on the hydraulic shear method according to claim 1, characterized in that: The stirring speed is 1000-30000 rpm, and the stirring time is 1-10 minutes.

5. The method for evaluating the strength of glass fiber wool based on the hydraulic shear method according to claim 2, characterized in that: Sulfuric acid is added to the water to adjust the pH value of the liquid in step one to 1-4.

6. The method for evaluating the strength of glass fiber wool based on the hydraulic shear method according to claim 1, characterized in that: The mesh size of the filter screen mentioned in step three is 100-500 mesh.

7. The method for evaluating the strength of glass fiber wool based on the hydraulic shear method according to claim 6, characterized in that: The filter screen has a mesh size of 150 and is made of polyester mesh.

8. The method for evaluating the strength of glass fiber wool based on the hydraulic shear method according to claim 1, characterized in that: The retained fibers after vacuum filtration in step three are then dried.

9. The method for evaluating the strength of glass fiber wool based on the hydraulic shear method according to claim 1, characterized in that: The strength in the method includes shear strength, aging resistance, and the overall damage resistance under dynamic wet conditions.

10. The method for evaluating the strength of glass fiber wool based on the hydraulic shear method according to claim 9, characterized in that: The steps described in step five n≥1.

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