CN110567864B - Method for representing corrosion resistance of glass fiber - Google Patents
Method for representing corrosion resistance of glass fiber Download PDFInfo
- Publication number
- CN110567864B CN110567864B CN201910795134.XA CN201910795134A CN110567864B CN 110567864 B CN110567864 B CN 110567864B CN 201910795134 A CN201910795134 A CN 201910795134A CN 110567864 B CN110567864 B CN 110567864B
- Authority
- CN
- China
- Prior art keywords
- glass fiber
- sample
- corrosion resistance
- temperature
- acid solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Ecology (AREA)
- Environmental Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Environmental & Geological Engineering (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Glass Compositions (AREA)
Abstract
The invention discloses a method for representing the corrosion resistance of glass fiber, which comprises the following steps: 1S: taking a glass fiber sample, and removing the impregnating compound for later use; 2S: weighing a glass fiber sample to be used, placing the glass fiber sample into a container, adding a corrosive solution, and reacting for a certain time; 3S: adding an acid solution into the beaker, stirring, filtering by using filter paper, and repeatedly washing the sample until the pH value of a washing solution is 6.8-7.2; 4S: and (3) transferring the sample and the filter paper into a vessel, drying and ashing at high temperature, cooling to room temperature, weighing, and calculating the weight loss due to corrosion. The method can more accurately judge the corrosion resistance of the glass fiber, and is convenient for research personnel to screen and discuss the glass formula; according to the method, the corroded glass fiber is cleaned by acid liquor cleaning, filter paper filtering and ashing, so that the quality of a corroded sample can be accurately weighed, the reliability of test data is high, the method is objective and accurate, the repeatability is good, and the operation is simple.
Description
Technical Field
The invention relates to a corrosion resistance test method, in particular to a method for representing the corrosion resistance of glass fiber.
Background
The service life of the glass fiber product is restricted by the service environment, and the corrosion resistance of the glass fiber product is an important basis for determining and evaluating the service life of the glass fiber composite material; in addition, the development of glass fiber formulations was also designed based on the principles related to corrosion resistance. Therefore, the evaluation of the corrosion resistance of the glass fiber and the determination of the corrosion resistance of the glass fiber composite material are of great significance.
At present, the existing glass fiber corrosion resistance test mainly adopts a test method of soaking, distilled water washing, drying and cooling, and the method has defects and limitations. For example, some chemical media react with glass fibers to form colloidal substances, and the simple washing of a sample with distilled water alone causes problems such as incomplete washing of the sample, and the like, resulting in poor reproducibility and accuracy of the test method.
Disclosure of Invention
The present invention is directed to solving the problems described above. The invention aims to provide a method for representing the corrosion resistance of glass fiber, which can more accurately judge the corrosion resistance of the glass fiber and is convenient for research personnel to screen and discuss a glass formula; according to the method, the corroded glass fiber is cleaned by acid liquor cleaning, filter paper filtering and ashing, so that the quality of a corroded sample can be accurately weighed, the reliability of test data is high, the method is objective and accurate, the repeatability is good, and the operation is simple.
According to one aspect of the present invention, there is provided a method of characterizing the corrosion resistance of glass fibers, comprising the steps of:
1S: taking a glass fiber sample, and removing the impregnating compound for later use;
2S: weighing a glass fiber sample to be used, placing the glass fiber sample into a container, adding a corrosive solution, and reacting for a certain time;
3S: adding an acid solution into the beaker, stirring, filtering by using filter paper, and repeatedly washing the sample until the pH value of a washing solution is 6.8-7.2;
4S: and (3) transferring the sample and the filter paper into a vessel, drying and ashing at high temperature, cooling to room temperature, weighing, and calculating the weight loss due to corrosion.
Wherein, in the step 4S, the high-temperature ashing temperature is 500 ℃ to 800 ℃.
Wherein, in the step 4S, the drying temperature is 60-190 ℃.
Wherein the volume ratio of the corrosion solution to the acid solution is (18-22) to (2.5-3.5).
Wherein the volume ratio of the etching solution to the acid solution is 20: 3.
In the step 1S, the specific operation of removing the wetting agent is as follows: burning the glass fiber sample at 500-800 deg.c for 20 min.
In the step 3S, the acid solution is a hydrochloric acid solution, a nitric acid solution or an acetic acid solution.
Wherein, in the step 3S, the acid solution is a 1:1 hydrochloric acid solution.
In the step 4S, the calculation formula of the corrosion weight loss mass percentage is as follows:
A＝(G0+G1-G2)/G0×100
wherein: a-weight loss ratio,%; g0The weight g of the glass fiber sample after the impregnating compound is removed in the step 1S; g1Is the weight of the vessel, g; g2The total weight of the cooled glass fiber sample and the vessel after ashing in step 4S, g.
Wherein, the vessel needs to be burned for 1 to 3 hours at the temperature of 600 to 850 ℃, then is placed into a drier for cooling, and the operation is repeated until the weight is constant.
The method for representing the corrosion resistance of the glass fiber comprises the steps of firstly taking a glass fiber sample, burning the glass fiber sample for more than or equal to 20min at the temperature of 500-800 ℃ to remove a sizing agent, putting the glass fiber sample into a dryer, and cooling to room temperature for standby application, wherein the burning temperature is preferably 550-750 ℃; the glass fiber samples are preferably cut from the same bundle of yarns to ensure that the samples have the same physical and chemical properties and are consistent in length. The burning time is too short, and the impregnating compound of the glass fiber sample cannot be completely removed; the long burning time can cause embrittlement of the glass fiber during long-time burning, and the glass fiber is easy to break in a corrosion test, so that the specific surface area is increased, and the accuracy of the test is influenced; therefore, the burning time is preferably 20 to 120min, and more preferably 30 to 60 min.
Weighing a glass fiber sample to be used, placing the glass fiber sample into a container, and adding a corrosive solution; then placing the container in a constant temperature laboratory, adjusting the temperature to 25 ℃, standing and corroding for 6-8 d;
adding an acid solution into the container to make the corrosion solution acidic (pH less than 5), stirring, filtering with filter paper, and repeatedly washing the sample until the pH value of the washing solution is 6.8-7.2. Wherein the acid solution is hydrochloric acid solution or nitric acid solution, acetic acid solution; preferably, the acid solution is a 1:1 hydrochloric acid solution. Because the glass fiber can generate substances such as calcium hydroxide, magnesium hydroxide and the like during alkali corrosion and seawater corrosion, and the substances can be adsorbed on the surface of the glass fiber, the hydroxide attached to the surface of the glass fiber is washed away by adopting an acid solution, preferably, the hydrochloric acid solution in a ratio of 1:1 is selected, so that the danger is low, and the test result is more accurate and stable.
In the present application, the volume ratio of the etching solution to the acid solution is (18-22): (2.5-3.5), and preferably, the volume ratio of the etching solution to the acid solution is 20: 3.
Burning the utensil at 600-850 deg.c for 1-3 hr, cooling in a drier, repeating the operation to constant weight and recording the weight. And (3) transferring the washed sample and filter paper into a vessel, drying, ashing at high temperature to constant weight, cooling to room temperature, weighing, and calculating the weight loss due to corrosion. Wherein the drying temperature is 60-190 ℃, and the high-temperature ashing temperature is 500-800 ℃; the ashing temperature is selected to ensure that the structural property of the glass is unchanged and the filter paper is completely ashed, so that the accuracy of experimental data is ensured. Preferably, the drying temperature is 90-120 ℃, and the high-temperature ashing temperature is 600-750 ℃. The ash content generated after the quantitative filter paper ashing is not more than 0.0009%, and the accuracy of experimental data can be ensured by adopting the quantitative filter paper ashing method, so that the test is simpler and quicker, and the data is reliable.
Substituting the measured data into a calculation formula of weight loss by corrosion mass percent:
A＝(G0+G1-G2)/G0×100
wherein: a-weight loss ratio,%; g0-weight of the glass fiber sample after removal of the size, g; g1-weight of vessel after constant weight, g; g2-total weight of glass fiber sample and vessel after ashing cooling, g. In the experiment, at least 5 parallel samples are prepared at one time, and the average value is obtained after obviously abnormal data are removed.
The temperature and time settings related in the method for representing the corrosion resistance of the glass fiber are obtained through a large number of theoretical researches and experimental practices, the method is a whole set of method for the corrosion of the liquid medium, the experimental steps are few, the instrument is simple, and the experiment is convenient and fast. At least 5 parallel samples are taken in one experiment, and the average value is taken after obviously abnormal data are removed. Compared with the existing experimental method, the experimental data obtained by the method is more accurate and reliable.
Other characteristic features and advantages of the invention will become apparent from the following description of embodiments, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention, in which like reference numerals are used to designate like elements, and the drawings in the following description are some, but not all embodiments of the invention, and will enable one of ordinary skill in the art to make and use the invention.
FIG. 1 shows a schematic representation of the steps of a method of characterizing the corrosion resistance of glass fibers in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The method for representing the corrosion resistance of the glass fiber specifically comprises the following steps:
1S: taking a glass fiber sample, burning for more than or equal to 20min at the temperature of 500-800 ℃ to remove the impregnating compound for later use;
2S: weighing a glass fiber sample to be used, placing the glass fiber sample in a beaker, adding a corrosive solution, and standing for 6-8 days;
3S: adding an acid solution into the beaker, stirring, filtering by using filter paper, and repeatedly washing the sample until the pH value of a washing solution is more than 6.8; wherein the acid solution is hydrochloric acid solution or nitric acid solution, acetic acid solution, preferably, the acid solution is 1:1 hydrochloric acid solution.
Wherein, the volume ratio of the etching solution to the acid solution is (18-22) to (2.5-3.5), preferably, the volume ratio of the etching solution to the acid solution is 20: 3.
4S: burning the utensil at 600-850 deg.c for 1-3 hr, cooling in a drier and repeating the operation to constant weight. And (3) transferring the washed sample and filter paper into a vessel, drying, ashing at high temperature, cooling to room temperature, weighing, and calculating the weight loss due to corrosion.
Wherein the drying temperature is 60-190 ℃, and the high-temperature ashing temperature is 500-800 ℃; preferably, the drying temperature is 90-120 ℃, and the high-temperature ashing temperature is 600-750 ℃.
The calculation formula of the corrosion weight loss mass percent of the glass fiber sample is as follows:
A＝(G0+G1-G2)/G0×100
wherein: a-weight loss ratio,%; g0The weight g of the glass fiber sample after the impregnating compound is removed in the step 1S; g1The weight of the vessel after constant weight, g; g2The total weight of the cooled glass fiber sample and the vessel after ashing in step 4S, g.
Specific examples of methods of characterizing the corrosion resistance properties of glass fibers of the present invention are shown below.
Examples
The seawater corrosion resistance of the glass fiber samples of the two different formulations a and b were compared.
1. Experimental apparatus equipment and reagents:
the instrument equipment comprises: a ceramic evaporating dish, stainless steel crucible tongs, tweezers, scissors, a plastic beaker, a measuring cylinder, a glass rod, a washing bottle, a conical flask, a funnel, an electronic balance with one-ten-thousandth precision, an electric heating blast drying box, a muffle furnace and quantitative filter paper;
reagent: distilled water, 1:1 hydrochloric acid, and artificially preparing seawater.
2. Experiment preparation work:
(1) cutting the glass fiber products of the formulas a and b into a length of 30mm, cleaning the surface, putting the glass fiber products into a muffle furnace, burning the glass fiber products for 30min at 650 ℃, taking the glass fiber products out, putting the glass fiber products into a dryer, and cooling the glass fiber products to room temperature for later use;
(2) selecting a ceramic evaporation vessel with smooth inner wall and edge and diameter of 60mm, and carrying out air-firing at 650 ℃ for 2h for later use; preparing 10 250ml plastic beakers, cleaning, and drying in a constant-temperature drying oven for later use.
(3) And (3) empty burning the muffle furnace for 2-3h at the temperature of over 600 ℃, and cleaning falling substances in the hearth after the empty burning.
3. The experimental conditions are as follows:
etching solution: artificially preparing seawater (the formula is shown in table 1);
and (3) corrosion conditions: corroding for 7d at normal temperature (25 ℃);
acid solution: 1:1 hydrochloric acid solution;
TABLE 1 main chemical composition of artificial seawater (% by weight)
| Composition (I) | NaCl | MgCl2 | Na2SO4 | CaCl2 | KCl | NaHCO3 | KBr | H3BO3 | SrCl2 | NaF | Others |
| Content (wt.) | 24.53 | 5.20 | 4.09 | 1.16 | 0.695 | 0.201 | 0.101 | 0.027 | 0.025 | 0.003 | Balance of |
4. And (3) experimental operation:
(1) accurately weighing 5.00g of the glass fiber sample to be used, respectively placing the glass fiber sample into a plastic beaker, and recording data.
(2) Adding 200ml of manually prepared seawater into each plastic beaker, slightly scattering the yarns by using a glass rod to completely immerse the yarns, and then sealing the yarns by using a preservative film; and (3) placing the beaker in a constant-temperature laboratory, adjusting the temperature of the laboratory to 25 ℃, and standing and corroding for 7 d.
(3) And weighing the mass of the prepared ceramic evaporation vessel, and recording data.
(4) Adding 30ml of hydrochloric acid solution (1:1) into each beaker respectively while stirring, and continuing stirring for 5 min; then filtering with quantitative filter paper, and repeatedly washing the sample with distilled water or deionized water at a temperature of more than or equal to 25 ℃ until the pH value of the washing liquid in the beaker is 6.8-7.2.
(5) Transferring the glass fiber sample in the beaker into an evaporation dish, washing the filter paper to be neutral, and transferring the filter paper into the evaporation dish; drying the evaporating dish in a constant-temperature drying oven at 105 ℃ for 2 h; and then putting the glass fiber sample into a muffle furnace for high-temperature ashing treatment, burning the glass fiber sample for 1h at 650 ℃, then transferring the glass fiber sample into a dryer for cooling to room temperature, weighing the mass of the evaporating dish and the mass of the glass fiber sample, and recording data.
Test example
The corrosion weight loss mass percentages of the glass fiber samples of the formula a and the formula b in the examples are calculated respectively and are shown in tables 2 and 3.
TABLE 2 a formula fiberglass sample seawater Corrosion 7d test data
From the data in table 2, the average weight loss ratio can be calculated to be 0.1333; standard deviation 0.0087; the range is 0.0280, and the obtained data is stable.
TABLE 3 b formula fiberglass sample seawater Corrosion 7d test data
From the data in table 3, the average weight loss rate can be calculated as 0.1237; standard deviation 0.0059; the range is 0.0160, and the obtained data is stable.
Comparative test example
The characterization results under different ashing temperatures are compared, wherein except the ashing temperature, other experimental parameters are the same as the experimental conditions in the embodiment. The results of the specific experimental comparison are shown in table 4.
Table 4 a, b recipes Using different ashing temperature comparison data
As can be seen from Table 4, the result of the experiment is not accurate enough when the ashing temperature is too high or too low, and stable and accurate experiment results can be obtained at 500-800 ℃.
In order to further embody the superiority of the method, the glass fiber samples of the two formulas a and b are corroded by artificial seawater for 7 days, the existing method (namely the method without using hydrochloric acid for cleaning and quantitatively ashing filter paper) and the method only using hydrochloric acid for cleaning or only using ashing filter paper are adopted for treatment, and the corrosion weight loss mass percentage is calculated and compared with the experimental data of the method. Specifically, the results are shown in Table 5.
Table 5 a, b formulations the data were compared using different methods
As can be seen from the data in tables 2, 3 and 5, the data obtained by the method for representing the corrosion resistance of the glass fiber is more stable. When the filter paper is not used for ashing after being cleaned by hydrochloric acid, a little corroded glass residue is remained on the filter paper, so that the experimental data has large fluctuation and the result is not accurate enough; when the filter paper is only used for ashing and is not cleaned by hydrochloric acid, hydroxides generated by corrosion can block the filter paper during filtering, so that the filtering speed is extremely slow or even the filter paper cannot be filtered, and the accuracy of experimental data can be influenced.
In conclusion, compared with the existing method, the method for representing the corrosion resistance of the glass fiber provided by the invention has the advantages that the colloid attached to the surface of the glass fiber is washed away by hydrochloric acid and the quantitative filter paper is ashed, so that the test is simpler and quicker, and the test data is more accurate and reliable.
The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A method of characterizing the corrosion resistance of glass fibers, comprising the steps of:
1S: taking a glass fiber sample, and removing the impregnating compound for later use;
2S: weighing a glass fiber sample to be used, placing the glass fiber sample into a container, adding a corrosive solution, and reacting for a certain time;
3S: adding an acid solution into the container, stirring, filtering by using filter paper, and repeatedly washing the sample until the pH value of a washing solution is 6.8-7.2; the acid solution is 1:1 hydrochloric acid solution;
4S: transferring the sample and the filter paper into a vessel, drying and ashing at high temperature, cooling to room temperature, weighing, and calculating the weight loss due to corrosion; the high-temperature ashing temperature is 550-800 ℃.
2. The method for characterizing the corrosion resistance of glass fibers according to claim 1, wherein in step 4S, the drying temperature is in the range of 60 ℃ to 190 ℃.
3. The method for characterizing the corrosion resistance of glass fibers of claim 1, wherein the volume ratio of the etching solution to the acid solution is (18-22): (2.5-3.5).
4. The method for characterizing the corrosion resistance of glass fibers according to claim 3, wherein the volume ratio of the etching solution to the acid solution is 20: 3.
5. The method for characterizing the corrosion resistance of glass fiber according to claim 1, wherein in the step 1S, the operation of removing the wetting agent is as follows: burning the glass fiber sample at 500-800 deg.c for 20 min.
6. The method for characterizing the corrosion resistance of glass fibers according to claim 1, wherein in step 4S, the calculated formula of the weight loss on corrosion in mass percent is:
A＝(G0+G1-G2)/G0×100
wherein: a-weight loss ratio,%; g0The weight g of the glass fiber sample after the impregnating compound is removed in the step 1S; g1Is the weight of the vessel, g; g2The total weight of the cooled glass fiber sample and the vessel after ashing in step 4S, g.
7. The method for characterizing the corrosion resistance of glass fiber according to claim 1 or 6, wherein the vessel is burned at a temperature of 600 ℃ to 850 ℃ for 1 to 3 hours, and then placed in a dryer for cooling, and the operation is repeated until the weight is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910795134.XA CN110567864B (en) | 2019-08-27 | 2019-08-27 | Method for representing corrosion resistance of glass fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910795134.XA CN110567864B (en) | 2019-08-27 | 2019-08-27 | Method for representing corrosion resistance of glass fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110567864A CN110567864A (en) | 2019-12-13 |
| CN110567864B true CN110567864B (en) | 2022-04-01 |
Family
ID=68776365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910795134.XA Active CN110567864B (en) | 2019-08-27 | 2019-08-27 | Method for representing corrosion resistance of glass fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110567864B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136870A (en) * | 2021-11-02 | 2022-03-04 | 泰山玻璃纤维邹城有限公司 | Continuous glass fiber weather resistance testing device and testing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539274A (en) * | 2012-01-11 | 2012-07-04 | 山东农业大学 | Fiber screen bag and method for rapidly determining coarse fiber |
| CN106680136A (en) * | 2016-12-15 | 2017-05-17 | 江苏省农业科学院 | Method for short-period rapid detection of degradability of plastic-based material |
| CN107200479A (en) * | 2017-07-20 | 2017-09-26 | 太仓市格雷得五金有限公司 | A kind of alkaline-resisting thermally resistant fiber glass and preparation method thereof |
| CN107860678A (en) * | 2017-10-31 | 2018-03-30 | 巨石集团九江有限公司 | A kind of method of testing of high-strength and high-modulus glass fibre acid resistance |
-
2019
- 2019-08-27 CN CN201910795134.XA patent/CN110567864B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539274A (en) * | 2012-01-11 | 2012-07-04 | 山东农业大学 | Fiber screen bag and method for rapidly determining coarse fiber |
| CN106680136A (en) * | 2016-12-15 | 2017-05-17 | 江苏省农业科学院 | Method for short-period rapid detection of degradability of plastic-based material |
| CN107200479A (en) * | 2017-07-20 | 2017-09-26 | 太仓市格雷得五金有限公司 | A kind of alkaline-resisting thermally resistant fiber glass and preparation method thereof |
| CN107860678A (en) * | 2017-10-31 | 2018-03-30 | 巨石集团九江有限公司 | A kind of method of testing of high-strength and high-modulus glass fibre acid resistance |
Non-Patent Citations (2)
| Title |
|---|
| 玻璃纤维碱侵蚀机理和耐碱性的探讨;葛敦世;《玻璃纤维》;20070226 * |
| 纤维玻璃耐碱性的研究;吴永坤等;《玻璃纤维》;20040830;第8页第4.2样品前处理-第4.3试样失重测定 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110567864A (en) | 2019-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110567864B (en) | Method for representing corrosion resistance of glass fiber | |
| CN108398320B (en) | Method for measuring tensile stress corrosion of wrought aluminum alloy | |
| CN106323857B (en) | Device and method for measuring water resistance of glass fiber | |
| CN109765139B (en) | Method for testing mixing uniformity of lithium battery positive electrode material | |
| CN104730201B (en) | Measurement method for content of hydrofluoric acid in titanium alloy pickling solution | |
| CN111289686A (en) | Method for measuring content of residual alkali in solution and application thereof | |
| CN102680307B (en) | Collecting method and determining method for free carbon in carton-containing tungsten alloy | |
| CN107860678A (en) | A kind of method of testing of high-strength and high-modulus glass fibre acid resistance | |
| CN114324830B (en) | Method for rapidly determining polymerization degree of refined cotton | |
| CN110618057A (en) | Method for detecting content of spandex and viscose in spandex and viscose blended fabric | |
| CN112284866A (en) | Corrosion detection method for grain size of molybdenum powder sintering material | |
| CN108593573A (en) | A method of measuring the lithium content and degree of substitution of carboxymethyl cellulose lithium | |
| Taylor et al. | Solubility Characteristics of Glasses Basically Different in Composition | |
| CN109898084A (en) | A kind of five be the caustic solution of rust-preventing aluminum alloy | |
| CN114216873A (en) | Method for measuring impurity content of polyacrylonitrile polymer liquid | |
| SU987523A1 (en) | Non-organic material checking resistance determination method | |
| CN112284961A (en) | Method for measuring gel content in gum dipping cloth | |
| JP3335748B2 (en) | LNG-fired boiler combustion exhaust gas condensate corrosion evaluation test method | |
| CN116818700A (en) | Method for detecting calcium carbonate in calcareous soil | |
| CN106631160B (en) | Preparation method of PVA/sodium silicate modified ceramic flame-retardant fiber | |
| CN109668876A (en) | The apparatus for quantitatively of industrial nitrocelluloses long-term chemical durability | |
| CN110987551A (en) | Preparation of glazing liquid and its effect test method | |
| Kolářová et al. | Interaction of historical lead glazes with corrosive media | |
| CN113848151A (en) | Method for detecting weight gain ratio of electroplated diamond | |
| CN116256396A (en) | Method for accurately measuring chloride ion content of rust layer on surface of bronze ware |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |