CN110044761B - Method for detecting gluing performance of regenerated fiber membrane - Google Patents
Method for detecting gluing performance of regenerated fiber membrane Download PDFInfo
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- CN110044761B CN110044761B CN201910271654.0A CN201910271654A CN110044761B CN 110044761 B CN110044761 B CN 110044761B CN 201910271654 A CN201910271654 A CN 201910271654A CN 110044761 B CN110044761 B CN 110044761B
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- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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Abstract
The invention relates to the technical field of regenerated fiber membranes, in particular to a method for detecting the gluing performance of a regenerated fiber membrane, which comprises the following steps of (1) selecting a regenerated fiber membrane to be detected, wherein the known water content ratio of the regenerated fiber membrane is M and the known softener content ratio of the regenerated fiber membrane is N as a sample; (2) weighing a sample for detecting the regenerated fiber membrane, putting the sample into an aluminum box, and weighing the mass G1 of the aluminum box and the sample, wherein the mass of the aluminum box is G4; (3) baking the sample (4) by using an oven, drying the aluminum box taken out of the oven and cooling to normal temperature; (5) weighing the mass G2 of the cooled aluminum box; (6) calculating the weight loss rate of the regenerated fiber membrane; (7) and (3) judging: according to the weight loss reference value, judging whether glycerin doping exists in the production process of the regenerated cellulose membrane by comparing the ratio N of the softening agent with the weight loss ratio value.
Description
Technical Field
The invention relates to the technical field of regenerated fiber membranes, in particular to a method for detecting the gluing performance of a regenerated fiber membrane.
Background
The regenerated cellulose membrane is an environment-friendly and degradable novel environment-friendly material, can be used for printing and has good composite performance, so that the regenerated cellulose membrane is widely applied to relevant industries such as printing, adhesive tapes and food packaging.
With the continuous expansion of the application field of the regenerated cellulose membrane products, the market has more and more concrete requirements on various indexes of the regenerated cellulose membrane. Wherein, for producing the special regenerated cellulose film for the adhesive tape, the adhesive tape manufacturer needs to perform sizing treatment on the regenerated cellulose film after purchasing the regenerated cellulose film, and then the regenerated cellulose film is made into the adhesive tape paper. However, in the prior art, whether the regenerated cellulose membrane is suitable for the sizing material to be attached before sizing cannot be judged, and the regenerated cellulose membrane cannot be degummed only after the sizing material is placed for a certain time, so that the factory efficiency of the product is influenced.
According to research, the main reason for degumming the adhesive tape in large batch is that glycerin is used in the softener, and the condition that glycerin is mixed in to cause degumming in large batch also occurs in the early stage, so that the gluing performance of the regenerated fiber film is poor, and a plurality of downstream customers are lost. However, since the commonly used softeners are diethylene glycol and triethylene glycol, and glycerin has the same atoms as diethylene glycol and triethylene glycol, it is impossible to detect whether or not glycerin is used in the regenerated fiber film by the conventional detection means.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide a detection method capable of judging the gluing performance of a regenerated fiber membrane, and the method has the advantages of accurate detection, easy operation and quick detection.
In order to realize the purpose, the following technical scheme is provided:
provides a method for detecting the gluing performance of a regenerated fiber membrane, which comprises the following steps,
(1) taking materials: selecting a regenerated fiber membrane to be detected as a sample, wherein the known water proportion of the fiber membrane to be detected is M and the known softener proportion of the fiber membrane to be detected is N;
(2) weighing: weighing 1.0-2.0G of the regenerated fiber membrane sample to be detected, putting the sample into an aluminum box, covering the aluminum box, weighing the mass of the aluminum box and the sample, recording the mass as G1, and recording the mass of the aluminum box as G4;
(3) baking: heating the aluminum box to 140-160 ℃ by using an oven, then placing the aluminum box with the sample into the oven, baking for 30-40 min, and taking out the aluminum box;
(4) and (3) cooling: putting the aluminum box taken out of the oven into a dryer, and cooling the aluminum box in the dryer for 30-40 min until the temperature of the aluminum box is reduced to normal temperature, so as to reduce the interference of moisture;
(5) weighing: taking out the cooled aluminum box, weighing the mass of the cooled aluminum box, and recording the mass as G2;
(6) and (3) calculating: the weight loss rate of the regenerated fiber membrane is calculated according to the following formula,
wherein M is the proportion of water;
g1 is the mass of the aluminum box and the sample before baking;
g2 is the mass of the aluminum box and the sample after baking;
(7) and (3) judging: according to the following reference values: a) when the weight loss ratio is almost 0, the softener is pure glycerol; b) when the weight loss rate is almost 25%, the softener is pure diethylene glycol; c) when the weight loss rate is almost 50%, the softener is pure triethylene glycol, and then whether glycerin doping exists in the production process of the regenerated cellulose membrane is judged by comparing the ratio N of the softener with the weight loss rate value.
In the step (1), the thickness of the regenerated fiber membrane sample to be detected is 27-32 μm, and the thinner sample is beneficial to improving the heating weight loss efficiency.
In the step (2), the aluminum box is firstly placed in a dryer for drying, then the aluminum box is placed at normal temperature, then the aluminum box is placed on an electronic scale, and after the reading of the electronic scale is stable, a sample is placed in the aluminum box, so that the constant weight of the aluminum box can be ensured, and the detection error can be reduced.
In the step (3), the temperature of the oven is raised to 140-160 ℃, the temperature is kept for 1min, and then the aluminum box with the sample is placed into the oven, so that the baking temperature is stable, and the detection error is reduced.
Wherein, the regenerated fiber membranes to be detected are selected and divided into three groups, the weight loss rate of the three groups of samples is detected according to the steps (1) - (7), and three groups of detection tests are carried out in parallel, so that the detection accuracy can be improved.
And (3) operating the steps (1) to (7) in an environment with room temperature of 25-30 ℃ and indoor humidity of 10-20%, so that influence factors of the environment on detection are reduced.
The aluminum box is 10-15 g in mass, and errors caused by the mass of the aluminum box are reduced.
Wherein the readings of G1 and G2 are accurate to five decimal places.
The invention has the beneficial effects that:
(1) since diethylene glycol and triethylene glycol used as softeners are liable to lose weight at high temperatures, and glycerin is not liable to lose weight, according to reference values: the weight loss rate of the regenerated cellulose film with the softener being pure diethylene glycol is 50%, the weight loss rate of the regenerated cellulose film with the softener being pure triethylene glycol is 25%, the weight loss rate of the regenerated cellulose film with the softener being pure glycerol is almost 0%, whether the softener used by the regenerated cellulose film of the adhesive tape is doped with glycerol can be detected by detecting and comparing the ratio of the softener to the weight loss rate, the mass loss caused by degumming after the glue application of the regenerated cellulose film due to the doping of the glycerol is avoided, and the method has the advantage of accurate detection.
(2) The detection method does not need to spend longer time to observe whether the regenerated fibers are degummed after sizing, can judge whether the regenerated fibers have the problem of degummed within shorter time, and improves the detection efficiency of the regenerated fibers.
(3) The detection method is easy to operate and can be applied to large-scale production.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1.
The method for detecting the gluing performance of the regenerated fiber membrane comprises the following steps,
(1) taking materials: selecting a regenerated fiber membrane to be detected as a sample, wherein the known water ratio of the fiber membrane to be detected is M and the known softener ratio is N;
(2) weighing: weighing 1.0G of the regenerated fiber membrane sample to be detected, putting the sample into an aluminum box, covering the aluminum box, weighing the mass of the aluminum box and the sample, and recording the mass as G1 and the mass of the aluminum box as G4;
(3) baking: heating the aluminum box to 140 ℃ by using an oven, then placing the aluminum box with the sample into the oven, baking for 30min, and taking out the aluminum box;
(4) and (3) cooling: putting the aluminum box taken out of the oven into a dryer, and cooling the aluminum box in the dryer for 30min until the temperature of the aluminum box is reduced to normal temperature;
(5) weighing: taking out the cooled aluminum box, weighing the mass of the cooled aluminum box, and recording the mass as G2;
(6) and (3) calculating: the weight loss rate of the regenerated fiber membrane is calculated according to the following formula,
wherein M is the proportion of water;
g1 is the mass of the aluminum box and the sample before baking;
g2 is the mass of the aluminum box and the sample after baking;
(7) and (3) judging: according to the following reference values: a) when the weight loss ratio is almost 0, the softener is pure glycerol; b) when the weight loss rate is almost 25%, the softener is pure diethylene glycol; c) when the weight loss rate is almost 50%, the softener is pure triethylene glycol, and then whether glycerin is doped in the production process of the regenerated cellulose film special for the adhesive tape is judged by comparing the ratio N of the softener with the weight loss rate.
In this embodiment, in the step (1), the thickness of the regenerated fiber membrane sample to be detected is 27 μm.
In this embodiment, in the step (2), the aluminum box is first placed in a dryer for drying, then the aluminum box is placed at normal temperature, then the aluminum box is placed on an electronic scale, and after the reading of the electronic scale is stable, the sample is placed in the aluminum box.
In this embodiment, the temperature of the oven is raised to 140 ℃, and after the temperature is maintained for 1min, the aluminum box with the sample is placed into the oven.
In the embodiment, the regenerated fiber membranes to be detected are selected and divided into three groups, and the weight loss rates of the three groups of samples are detected according to the steps (1) - (7).
In this example, the steps (1) to (7) were performed under an environment of room temperature of 25 ℃ and room humidity of 10%.
In this example, the mass of the aluminum case was 10 g.
In this embodiment, the readings of G1 and G2 are accurate to the fifth decimal place.
Example 2.
The method for detecting the gluing performance of the regenerated fiber membrane comprises the following steps,
(1) taking materials: selecting a regenerated fiber membrane to be detected as a sample, wherein the known water ratio of the fiber membrane to be detected is M and the known softener ratio is N;
(2) weighing: weighing 2.0G of the regenerated fiber membrane sample to be detected, putting the sample into an aluminum box, covering the aluminum box, weighing the mass of the aluminum box and the sample, and recording the mass as G1 and the mass of the aluminum box as G4;
(3) baking: heating the aluminum box to 160 ℃ by using an oven, then placing the aluminum box with the sample into the oven, baking for 40min, and taking out the aluminum box;
(4) and (3) cooling: putting the aluminum box taken out of the oven into a dryer, and then cooling the aluminum box in the dryer for 40min until the temperature of the aluminum box is reduced to normal temperature;
(5) weighing: taking out the cooled aluminum box, weighing the mass of the cooled aluminum box, and recording the mass as G2;
(6) and (3) calculating: the weight loss rate of the regenerated fiber membrane is calculated according to the following formula,
wherein M is the proportion of water;
g1 is the mass of the aluminum box and the sample before baking;
g2 is the mass of the aluminum box and the sample after baking;
(7) and (3) judging: according to the following reference values: a) when the weight loss ratio is almost 0, the softener is pure glycerol; b) when the weight loss rate is almost 25%, the softener is pure diethylene glycol; c) when the weight loss rate is almost 50%, the softener is pure triethylene glycol, and then whether glycerin is doped in the production process of the regenerated cellulose film special for the adhesive tape is judged by comparing the ratio N of the softener with the weight loss rate.
In this embodiment, in the step (1), the thickness of the regenerated fiber membrane sample to be detected is 32 μm.
In this embodiment, in the step (2), the aluminum box is first placed in a dryer for drying, then the aluminum box is placed at normal temperature, then the aluminum box is placed on an electronic scale, and after the reading of the electronic scale is stable, the sample is placed in the aluminum box.
In this embodiment, the temperature of the oven is raised to 160 ℃, and after the temperature is maintained for 1min, the aluminum box with the sample is placed into the oven.
In the embodiment, the regenerated fiber membranes to be detected are selected and divided into three groups, and the weight loss rates of the three groups of samples are detected according to the steps (1) - (7).
In this example, the steps (1) to (7) were performed under an environment of room temperature of 30 ℃ and room humidity of 20%.
In this example, the mass of the aluminum case was 15 g.
In this embodiment, the readings of G1 and G2 are accurate to the fifth decimal place.
Example 3.
The method for detecting the gluing performance of the regenerated fiber membrane comprises the following steps,
(1) taking materials: selecting a regenerated fiber membrane to be detected as a sample, wherein the known water ratio of the fiber membrane to be detected is M and the known softener ratio is N;
(2) weighing: weighing 1.5G of the regenerated fiber membrane sample to be detected, putting the sample into an aluminum box, covering the aluminum box, weighing the mass of the aluminum box and the sample, and recording the mass as G1 and the mass of the aluminum box as G4;
(3) baking: heating the aluminum box to 150 ℃ by using an oven, then placing the aluminum box with the sample into the oven, baking for 35min, and taking out the aluminum box;
(4) and (3) cooling: putting the aluminum box taken out of the oven into a dryer, and cooling the aluminum box in the dryer for 35min until the temperature of the aluminum box is reduced to normal temperature;
(5) weighing: taking out the cooled aluminum box, weighing the mass of the cooled aluminum box, and recording the mass as G2;
(6) and (3) calculating: the weight loss rate of the regenerated fiber membrane is calculated according to the following formula,
wherein M is the proportion of water;
g1 is the mass of the aluminum box and the sample before baking;
g2 is the mass of the aluminum box and the sample after baking;
(7) and (3) judging: according to the following reference values: a) when the weight loss ratio is almost 0, the softener is pure glycerol; b) when the weight loss rate is almost 25%, the softener is pure diethylene glycol; c) when the weight loss rate is almost 50%, the softener is pure triethylene glycol, and then whether glycerin is doped in the production process of the regenerated cellulose film special for the adhesive tape is judged by comparing the ratio N of the softener with the weight loss rate.
In this embodiment, in the step (1), the thickness of the regenerated fiber membrane sample to be detected is 30 μm.
In this embodiment, in the step (2), the aluminum box is first placed in a dryer for drying, then the aluminum box is placed at normal temperature, then the aluminum box is placed on an electronic scale, and after the reading of the electronic scale is stable, the sample is placed in the aluminum box.
In this embodiment, the temperature of the oven is raised to 150 ℃, and after the temperature is maintained for 1min, the aluminum box with the sample is placed into the oven.
In the embodiment, the regenerated fiber membranes to be detected are selected and divided into three groups, and the weight loss rates of the three groups of samples are detected according to the steps (1) - (7).
In this example, the steps (1) to (7) were performed under an environment of 28 ℃ at room temperature and 15% at room humidity.
In this example, the mass of the aluminum case was 12 g.
In this embodiment, the readings of G1 and G2 are accurate to the fifth decimal place.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A method for detecting the gluing performance of a regenerated fiber membrane is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) taking materials: selecting a regenerated fiber membrane to be detected as a sample, wherein the proportion of the known water of the regenerated fiber membrane to be detected is M and the proportion of the known softener is N;
(2) weighing: weighing 1.0-2.0G of the regenerated fiber membrane sample to be detected, putting the sample into an aluminum box, covering the aluminum box, weighing the mass of the aluminum box and the sample, recording the mass as G1, and recording the mass of the aluminum box as G4;
(3) baking: heating the oven to 140-160 ℃ by using the oven, then putting the aluminum box with the sample into the oven, baking for 30-40 min, and taking out the aluminum box;
(4) and (3) cooling: putting the aluminum box taken out of the oven into a dryer, and cooling the aluminum box in the dryer for 30-40 min until the temperature of the aluminum box is reduced to normal temperature;
(5) weighing: taking out the cooled aluminum box, weighing the mass of the cooled aluminum box, and recording the mass as G2;
(6) and (3) calculating: the weight loss rate of the regenerated fiber membrane is calculated according to the following formula,
wherein M is the proportion of water;
g1 is the mass of the aluminum box and the sample before baking;
g2 is the mass of the aluminum box and the sample after baking;
(7) and (3) judging: according to the following reference values: a) when the weight loss ratio is almost 0, the softener is pure glycerol; b) when the weight loss rate is almost 25%, the softener is pure diethylene glycol; c) when the weight loss rate is almost 50%, the softener is pure triethylene glycol, and then whether glycerin doping exists in the production process of the tape-dedicated regenerated cellulose film is judged by comparing the ratio of the softener N to the weight loss rate.
2. The method for detecting the gluing performance of the regenerated fiber membrane as claimed in claim 1, wherein the method comprises the following steps: in the step (1), the thickness of the regenerated fiber membrane sample to be detected is 27-32 μm.
3. The method for detecting the gluing performance of the regenerated fiber membrane as claimed in claim 1, wherein the method comprises the following steps: in the step (2), the aluminum box is firstly placed in a dryer for drying treatment, then the aluminum box is cooled to normal temperature, then the aluminum box is placed on an electronic scale, and after the reading of the electronic scale is stable, the sample is placed in the aluminum box.
4. The method for detecting the gluing performance of the regenerated fiber membrane as claimed in claim 1, wherein the method comprises the following steps: in the step (3), the temperature of the oven is raised to 140-160 ℃, the temperature is kept for 1min, and then the aluminum box with the sample is placed into the oven.
5. The method for detecting the gluing performance of the regenerated fiber membrane as claimed in claim 1, wherein the method comprises the following steps: selecting the regenerated fiber membranes to be detected, dividing the regenerated fiber membranes into three groups, and detecting the weight loss rate of the three groups of samples according to the steps (1) - (7) respectively.
6. The method for detecting the gluing performance of the regenerated fiber membrane as claimed in claim 1, wherein the method comprises the following steps: and (7) operating the steps (1) to (7) in an environment with room temperature of 25-30 ℃ and room humidity of 10-20%.
7. The method for detecting the gluing performance of the regenerated fiber membrane as claimed in claim 1, wherein the method comprises the following steps: the mass of the aluminum box is 10-15 g.
8. The method for detecting the gluing performance of the regenerated fiber membrane as claimed in claim 1, wherein the method comprises the following steps: the readings of G1 and G2 were accurate to five decimal places.
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