CN110940609A - Method for measuring gum content of gum-dipped cloth - Google Patents
Method for measuring gum content of gum-dipped cloth Download PDFInfo
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- CN110940609A CN110940609A CN201911062964.8A CN201911062964A CN110940609A CN 110940609 A CN110940609 A CN 110940609A CN 201911062964 A CN201911062964 A CN 201911062964A CN 110940609 A CN110940609 A CN 110940609A
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- 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
Abstract
The invention discloses a method for measuring the gum content in gum dipping cloth, which comprises the following steps: (1) taking at least three samples I and II from the resin-impregnated carbon cloth or high silica cloth and the resin-non-impregnated carbon cloth or high silica cloth in weft directions; the number, the size and the position of the sample II are the same as those of the sample I; (2) calculating the volatile content of each sample I; (3) measuring the gel content of each sample I; (4) obtaining the volatile content of the dipped fabricⅤAnd gel contentR。The method has the advantages of simple operation method, convenient and quick detection process, low cost and high detection result accuracy.
Description
Technical Field
The invention belongs to the technical field of non-metallic material detection, and particularly relates to a method for measuring the gum content of gum-dipped cloth.
Background
The resin-based ablation heat-proof material mainly adopts carbon/phenolic aldehyde and high silica/phenolic resin composite materials, and the material forming material is impregnated cloth which is prepared by taking phenolic resin as matrix resin and carbon fiber cloth or high silica cloth as a reinforcing material. 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 technological parameters of the volatile component and the gel content of the gum dipping cloth of the tail pipe forming material of a certain series of products are determined to be 4.00-8.00% and 35.00-42.00% on the basis of repeated tests. Through nondestructive testing and performance testing, the product percent of pass reaches about 95%. Compared with the product qualification rate in the initial stage of development, the product qualification rate is improved by about half, and the mass production cost is saved.
In the background technology, the domestic method for measuring the gum content of the gum dipping cloth is to burn the gum dipping cloth which is completely volatilized in a muffle furnace at 600 +/-10 ℃ for 10min, cool the gum dipping cloth to room temperature for weighing, calculate the gum content, and find out in a plurality of detection tests that the error of the gum content detected by the method is large, and the gum content measurement result is larger than the actual result because a part of hydrocarbon in the original gum dipping cloth can be burned at the high temperature of 600 ℃. In order to overcome the defects, accurately master the gum content in the dipped fabric and strengthen the quality control of the dipped fabric, a method for measuring the gum content in the dipped fabric is researched.
Disclosure of Invention
In order to solve the technical problems, the invention provides the method for measuring the gum content in the dipped cloth, which is simple and convenient to operate and accurate in measurement result.
The technical scheme adopted by the invention is as follows: a method for measuring the gel content in the dipped fabric comprises the following steps:
(1) preparation of the samples
A) Sequentially taking samples I from the head end to the tail end of the resin-impregnated carbon cloth and the high silica cloth in a weft direction, wherein the samples I are at least three samples and have the same size; the obtained sample I is sequentially marked as sample II, i is 1,2, … …, n, and counted from the head end, wherein n is the total number of the sample I;
B) taking a sample II from the un-impregnated resin carbon cloth and the high silica cloth in a weft direction, wherein the number, the size and the position of the sample II are respectively the same as those of the sample I; the obtained sample ii was sequentially designated as sample ii i, i ═ 1,2, … …, n, and counted from the head end;
(2) the volatile content V of each sample I was calculatedi
Weighing the mass of the sample Ii, putting the sample Ii into a crucible which is constant in weight in an electrothermal drying oven, drying the sample Ii in the electrothermal drying oven for 5min, moving the sample Ii into a dryer to cool the sample to room temperature, and weighing the mass of the dried sample Ii;
the volatile content V was calculated according to the following formulai：
In the formula:
m1ithe mass of the dried sample II is gram;
mimass of the sample II before baking, wherein the unit is gram;
(3) determination of the gel content of each sample I
Putting the sample II i into a crucible which is constant in weight in an electrothermal drying oven, drying the sample II i in the electrothermal drying oven for 5min, moving the sample II i into a dryer to cool to room temperature, and weighing the mass of the dried sample II i;
the gel content R of each sample I was calculated by the following formulai
In the formula:
m1imass of the dried sample II, in grams;
m2imass of the dried sample II i in grams;
(4) the volatile content V and the gum content R of the gum dipping cloth are obtained
The volatile content of the dipped fabric is calculated according to the following formula
The gum content of the gum-dipped cloth was calculated according to the following formula
In the method for measuring the gel content in the impregnated cloth, in the step (1), three samples I are taken from the two latitudinal ends and the middle part of the impregnated carbon cloth and the high silica cloth respectively, and the size of each sample I is 8cm multiplied by 8 cm.
In the method for measuring the gel content in the dipped fabric, the temperature in the electrothermal drying box is 180 +/-2 ℃ when the sample I is dried in the step (2); the mass of sample I before and after baking was measured to the nearest 0.0001 g.
In the method for measuring the gel content in the gum dipping cloth, the temperature in the electric heating drying oven is 180 +/-2 ℃ when the sample II is dried in the step (4), and the mass of the dried sample II is measured to be accurate to 0.0001 g.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the mass of the sample I which is subjected to the volatilization time-sharing drying after being impregnated with the resin carbon cloth and the high silica cloth to subtract the mass of the sample II which is subjected to the volatilization time-sharing drying after being impregnated with the resin carbon cloth and the high silica cloth and then divides the mass of the sample I which is subjected to the volatilization time-sharing drying after being impregnated with the resin carbon cloth and the high silica cloth into the mass of the sample II which is subjected to the volatilization time-sharing drying after being impregnated with the resin carbon cloth and the high silica cloth to be taken as the gel content.
Detailed Description
The invention is further described with reference to specific examples.
Example 1
The method for measuring the gel content of the resin-impregnated carbon cloth and the high silica cloth comprises the following steps:
(1) preparation of the samples
A) A piece of sample I with the size of 8cm multiplied by 8cm is taken from the weft direction of the resin-impregnated carbon cloth and the high silica cloth according to the left end, the middle part and the right end respectively, and is marked as a sample II, wherein I is 1,2 and 3, and the counting is started from the left end.
B) A sample II with the size of 8cm multiplied by 8cm is taken from the left end, the middle part and the right end of the non-resin-impregnated carbon cloth and the high silica cloth in a weft direction, and is marked as a sample II i, wherein i is 1,2 and 3, and the counting is started from the left end.
(2) The volatile content V of each sample I was calculatedi
Weighing the mass of the sample I1 to be accurate to 0.0001g, which is 0.9270g, putting the sample I1 into a crucible which is subjected to constant weight in an electrothermal drying oven at 180 +/-2 ℃, drying the sample I1 in the electrothermal drying oven at 180 +/-2 ℃ for 5min, transferring the sample I into a drier to be cooled to room temperature, and weighing the mass of the dried sample I1 to be accurate to 0.0001g, which is 0.8709 g.
According to the formula
The volatile content V of sample I1 was calculated1：
In the formula:
m1ithe mass of the dried sample II is gram;
mimass of the sample II before baking, wherein the unit is gram;
m11mass of sample I1 after baking in grams (g);
m1the mass of sample I1 before baking, in grams (g).
The volatile content V of each of the samples I2 and I3 was calculated in accordance with the above procedure2、Ⅴ3:
The mass of the sample I2 and the sample I3 before baking is 0.9115g and 0.9440g respectively; the baked masses of the sample I2 and the sample I3 are 0.8398g and 0.8772g respectively; according to ViThe calculation formula can obtain that the volatile contents of the sample I2 and the sample I3 are respectively as follows: v. v2＝7.87％，Ⅴ3＝7.08％。
(3) Determination of the gel content of each sample I
Putting the sample II 1 into a crucible which is constant in weight in an electrothermal drying oven at 180 +/-2 ℃, drying the sample II 1 in the electrothermal drying oven at 180 +/-2 ℃ for 5min, transferring the sample II into a drier, cooling the sample II to room temperature, and weighing the sample II to obtain 0.5281g of mass.
According to the formula
Calculation of the gel content R of sample I11：
In the formula:
m2imass of the dried sample II i in grams;
m21the mass of sample II 1 after baking, in grams (g).
The respective gel contents R of the samples I2 and I3 were calculated according to the above procedure2、R3：
The weight of the baked samples II 2 and II 3 was 0.5281g and 0.5281g, respectively, according to the formula
Calculated gel contents R of samples II 2 and II 32＝37.12％、R3＝39.80％。
(4) Taking the arithmetic average of the volatile contents of the three samples I as the final result of the volatile contents of the resin-impregnated carbon cloth and the high-silica cloth, and obtaining the volatile contents of the resin-impregnated carbon cloth and the high-silica cloth as follows: 7.00 percent.
And taking the arithmetic average of the gel contents of the three samples I as the final result of the gel contents of the resin impregnated carbon cloth and the high silica cloth, and accurately obtaining the gel contents of the resin impregnated carbon cloth and the high silica cloth 2 bits after decimal point: 38.76 percent.
Claims (4)
1. A method for measuring the gel content in the dipped fabric comprises the following steps:
(1) preparation of the samples
A) Sequentially taking samples I from the head end to the tail end of the resin-impregnated carbon cloth and the high silica cloth in a weft direction, wherein the samples I are at least three samples and have the same size; the obtained sample I is sequentially marked as sample II, i is 1,2, … …, n, and counted from the head end, wherein n is the total number of the sample I;
B) taking a sample II from the un-impregnated resin carbon cloth and the high silica cloth in a weft direction, wherein the number, the size and the position of the sample II are respectively the same as those of the sample I; the obtained sample ii was sequentially designated as sample ii i, i ═ 1,2, … …, n, and counted from the head end;
(2) the volatile content V of each sample I was calculatedi
Weighing the mass of the sample Ii, putting the sample Ii into a crucible which is constant in weight in an electrothermal drying oven, drying the sample Ii in the electrothermal drying oven for 5min, moving the sample Ii into a dryer to cool the sample to room temperature, and weighing the mass of the dried sample Ii;
calculating the content of volatile components in the dipped fabric:
the volatile content V was calculated according to the following formulai：
In the formula:
m1ithe mass of the dried sample II is gram;
mimass of the sample II before baking, wherein the unit is gram;
(3) determination of the gel content of each sample I
Putting the sample II i into a crucible which is constant in weight in an electrothermal drying oven, drying the sample II i in the electrothermal drying oven for 5min, moving the sample II i into a dryer to cool to room temperature, and weighing the mass of the dried sample II i;
the gel content R of each sample I was calculated by the following formulai
In the formula:
m1imass of the dried sample II, in grams;
m2imass of the dried sample II i in grams;
(4) the volatile content V and the gum content R of the gum dipping cloth are obtained
Calculating the volatile content V of the dipped fabric according to the following formula:
the gum content R of the dipped fabric is calculated according to the following formula:
2. the method for determining the gel content in the dipped fabric according to claim 1, wherein in the step (1), three samples I are taken from the impregnated carbon fabric and the high silica fabric, wherein the three samples I are respectively taken from the latitudinal ends and the middle part of the impregnated carbon fabric, and the size of each sample I is 8cm x 8 cm.
3. The method for determining the gel content in the treated fabric according to claim 1, wherein the temperature in the electrothermal drying oven is 180 ℃ ± 2 ℃ when the sample I is baked in the step (2); the mass of sample I before and after baking was measured to the nearest 0.0001 g.
4. The method for determining the gel content in the treated fabric according to claim 1, wherein the temperature in the electrothermal drying oven is 180 ℃ ± 2 ℃ when the sample II is dried in the step (4), and the mass of the dried sample II is measured to be 0.0001 g.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111455723A (en) * | 2020-04-08 | 2020-07-28 | 长春珑鑫新材料有限公司 | Method for accurately controlling product density in production process of aramid paper honeycomb |
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| CN111455723A (en) * | 2020-04-08 | 2020-07-28 | 长春珑鑫新材料有限公司 | Method for accurately controlling product density in production process of aramid paper honeycomb |
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Application publication date: 20200331 |