CN112284961A - Method for measuring gel content in gum dipping cloth - Google Patents
Method for measuring gel content in gum dipping cloth Download PDFInfo
- Publication number
- CN112284961A CN112284961A CN202011283063.4A CN202011283063A CN112284961A CN 112284961 A CN112284961 A CN 112284961A CN 202011283063 A CN202011283063 A CN 202011283063A CN 112284961 A CN112284961 A CN 112284961A
- Authority
- CN
- China
- Prior art keywords
- beaker
- balance
- cooler
- gel content
- weighing
- 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.)
- Pending
Links
- 239000004744 fabric Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007598 dipping method Methods 0.000 title description 2
- 238000005303 weighing Methods 0.000 claims abstract description 10
- 238000001704 evaporation Methods 0.000 claims abstract description 8
- 230000008020 evaporation Effects 0.000 claims abstract description 8
- 239000000446 fuel Substances 0.000 claims abstract description 4
- 239000002689 soil Substances 0.000 claims abstract description 4
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 27
- 238000000605 extraction Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000000084 colloidal system Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000004904 shortening Methods 0.000 claims description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a method for measuring the gel content in a dipped fabric, (1) placing a beaker in a cooler near a balance; (2) weighing the weights of the weighing beaker and each experimental beaker to 0.1mg, and recording; (3) the test sample is filtered, 0.5mL of test sample of 50mL of soil is weighed by a graduated cylinder and poured into each weighed beaker (except for a balance beaker, one beaker is used for each fuel to be tested), the beakers containing the test sample and the balance beakers are placed into an evaporation bath, the time of the first beaker and the last beaker is as short as possible, when the test sample is evaporated by using air, stainless forceps or pliers are used, and a conical adapter is placed.
Description
Technical Field
The invention relates to the technical field of impregnated cloth, in particular to a method for measuring the gel content in the impregnated cloth.
Background
The impregnated cloth is made by impregnating cotton cloth or glass cloth with a solution of phenolic resin or with molten phenolic resin. The main applications are as follows: the pipe is made by a winding method and is used for conveying petroleum, water, coal gas and the like; is made of cotton cloth, and is preferably used in weak acid and weak base; made of glass cloth and can be used in concentrated solution of acid and salt; the protective layer of various components is made by a bonding method to increase the chemical stability; the low pressure forming process can produce large product with complicated shape and high mechanical performance.
The gel content is an important quality control index of the dipped fabric, the gel content is represented by the mass fraction of the resin content, the gel content has great influence on the mechanical property of the product, and other properties of the product such as moisture absorption, electrical property and chemical corrosion resistance also depend on the type and the content of the resin. Therefore, the control of the gel content is very important when the product is formed. The existing detection and test method has large error of the detected gel content, and the gel content measurement result is larger than the actual result because a part of hydrocarbons in the original impregnated cloth can be burned at the high temperature of 600 ℃.
Disclosure of Invention
In view of the above problems, the present invention provides a method for measuring the gel content in a treated fabric, which solves the problems mentioned in the background art. The method comprises the following specific steps:
in order to achieve the purpose, the invention adopts the following technical scheme: a method for measuring the gel content in the dipped fabric comprises the following steps:
(1) placing the beaker in a cooler near the balance;
(2) weighing the weights of the weighing beaker and each experimental beaker to 0.1mg, and recording;
(3) filtering the sample, weighing 0.5mL of sample with 50mL of soil by using a graduated cylinder, pouring the sample into each weighed beaker (except for a balance beaker, one beaker is used for each fuel to be measured), putting the beaker containing the sample and the balance beaker into an evaporation bath, and shortening the time of putting the first beaker and the last beaker as much as possible;
(4) after heating, the conical adapter is removed by stainless steel tweezers or pliers, the beakers are transferred from the bath to the cooler, the cooler is placed near the balance for 2 hours to weigh each beaker, and the mass of each beaker is recorded;
(5) if the content of the unwashed colloid is not less than 0.5mg/100mL, 25mL of n-heptane is added into each beaker containing the residue, the mixture is stopped for 10min by lightly rotating for 30s, and the tared beakers are treated in the same way;
(6) carefully pour off the n-heptane, preventing any loss of solids and residue;
(7) re-extracting with a second part of n-heptane according to steps 5 and 6, and if the extraction is colored, performing a third extraction, wherein the extraction cannot be performed for more than 3 times;
(8) placing the beaker (including a tared beaker) into an evaporation bath maintained at 160-165 deg.C, drying the beaker for 5min + -0.5 min without placing a conical adapter;
(9) at the end of drying, the beaker was removed from the bath with stainless steel tweezers or forceps, placed in a cooler, allowed to cool for 2h near the balance, weighed for each beaker, and its mass recorded.
Preferably, the cooling time in step (1) is at least 2 h.
The invention has the following beneficial effects: the temperature in the whole process of the method for measuring the gel content in the dipped cloth is far lower than the high temperature of 600 ℃, the beaker is placed into an evaporation bath maintained at 160-165 ℃ and is not directly contacted with the high temperature, so that part of hydrocarbons in the original dipped cloth are prevented from being burnt, the result of measuring the gel content is prevented from being larger than the actual result, and in addition, in the step 7, the steps 5 and 6 are required to be extracted again, so that the error of the experimental result is avoided.
Detailed Description
The following examples may assist those skilled in the art in a more complete understanding of the present invention, but are not intended to limit the invention in any way.
A method for measuring the gel content in the dipped fabric comprises the following steps:
(1) placing the beaker in a cooler near a balance, and cooling for at least 2 h;
(2) weighing the weights of the weighing beaker and each experimental beaker to 0.1mg, and recording;
(3) the sample is filtered, 0.5mL of 50mL of soil is weighed by a graduated cylinder and poured into each weighed beaker (except for a tared beaker, one beaker for each fuel to be measured), the beakers containing the samples and the tared beakers are placed into an evaporation bath, the time for placing the first beaker and the last beaker is as short as possible.
(4) After heating, the conical adapter is removed by stainless steel tweezers or pliers, the beakers are transferred from the bath to the cooler, the cooler is placed near the balance for 2 hours to weigh each beaker, and the mass of each beaker is recorded;
(5) if the content of the unwashed colloid is not less than 0.5mg/100mL, 25mL of n-heptane is added into each beaker containing the residue, the mixture is stopped for 10min by lightly rotating for 30s, and the tared beakers are treated in the same way;
(6) carefully pour off the n-heptane, preventing any loss of solids and residue;
(7) re-extracting with a second part of n-heptane according to steps 5 and 6, and if the extraction is colored, performing a third extraction, wherein the extraction cannot be performed for more than 3 times;
(8) placing the beaker (including a tared beaker) into an evaporation bath maintained at 160-165 deg.C, drying the beaker for 5min + -0.5 min without placing a conical adapter;
(9) at the end of drying, the beaker was removed from the bath with stainless steel tweezers or forceps, placed in a cooler, allowed to cool for 2h near the balance, weighed for each beaker, and its mass recorded.
In conclusion, the calculation of the gum content in the dipped fabric S ═ 2000(C-D + X-Z)
C, recording the mass of the beaker and the residue in the step 9, wherein the unit is g;
d, recording the mass of the empty beaker in the step 2, wherein the unit is g;
x is the mass of the tared beaker in the step 2, and the unit is g;
z-mass of the tared beaker plus residue recorded in step 9 in g.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (2)
1. A method for measuring the gel content in the dipped fabric comprises the following steps:
(1) placing the beaker in a cooler near the balance;
(2) weighing the weights of the weighing beaker and each experimental beaker to 0.1mg, and recording;
(3) filtering the sample, weighing 0.5mL of sample with 50mL of soil by using a graduated cylinder, pouring the sample into each weighed beaker (except for a balance beaker, one beaker is used for each fuel to be measured), putting the beaker containing the sample and the balance beaker into an evaporation bath, and shortening the time of putting the first beaker and the last beaker as much as possible;
(4) after heating, the conical adapter is removed by stainless steel tweezers or pliers, the beakers are transferred from the bath to the cooler, the cooler is placed near the balance for 2 hours to weigh each beaker, and the mass of each beaker is recorded;
(5) if the content of the unwashed colloid is not less than 0.5mg/100mL, 25mL of n-heptane is added into each beaker containing the residue, the mixture is stopped for 10min by lightly rotating for 30s, and the tared beakers are treated in the same way;
(6) carefully pour off the n-heptane, preventing any loss of solids and residue;
(7) re-extracting with a second part of n-heptane according to steps 5 and 6, and if the extraction is colored, performing a third extraction, wherein the extraction cannot be performed for more than 3 times;
(8) placing the beaker (including a tared beaker) into an evaporation bath maintained at 160-165 deg.C, drying the beaker for 5min + -0.5 min without placing a conical adapter;
(9) at the end of drying, the beaker was removed from the bath with stainless steel tweezers or forceps, placed in a cooler, allowed to cool for 2h near the balance, weighed for each beaker, and its mass recorded.
2. The method for determining the gel content in the treated fabric according to claim 1, wherein: the cooling time in the step (1) is at least 2 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011283063.4A CN112284961A (en) | 2020-11-17 | 2020-11-17 | Method for measuring gel content in gum dipping cloth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011283063.4A CN112284961A (en) | 2020-11-17 | 2020-11-17 | Method for measuring gel content in gum dipping cloth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112284961A true CN112284961A (en) | 2021-01-29 |
Family
ID=74399030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011283063.4A Pending CN112284961A (en) | 2020-11-17 | 2020-11-17 | Method for measuring gel content in gum dipping cloth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112284961A (en) |
-
2020
- 2020-11-17 CN CN202011283063.4A patent/CN112284961A/en active Pending
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210129 |