CN112485097A - Sample preparation method for factory inspection of elastic adhesive - Google Patents
Sample preparation method for factory inspection of elastic adhesive Download PDFInfo
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- CN112485097A CN112485097A CN202011293802.8A CN202011293802A CN112485097A CN 112485097 A CN112485097 A CN 112485097A CN 202011293802 A CN202011293802 A CN 202011293802A CN 112485097 A CN112485097 A CN 112485097A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a sample preparation method for factory inspection of an elastic adhesive, which comprises the following steps: extruding an adhesive sample at one end of a rectangular mould groove, and filling the adhesive in the whole mould groove by using a metal scraper along the same direction; pushing out the redundant adhesive along one end of the mold by using a glass rod to form an adhesive layer with a horizontal surface; curing the prepared mould at room temperature for a certain time, and directly demoulding; after demolding, the film was cut into test specimens with a cutter of a predetermined type. The sample preparation method is simple and convenient to operate, low in sample preparation cost and high in efficiency, the surface of the film prepared by the method is flat, the defects such as bubbles and flash are few, different test sample strips can be prepared by matching with different cut-off knives, and meanwhile, the defect positions can be selectively avoided, so that the quality of the sample strips is greatly improved, a good premise is provided for adhesive performance detection, the accuracy of detection data is improved, batch detection is realized, and the detection efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of elastic adhesives, in particular to a sample preparation method for factory inspection of elastic adhesives.
Background
The elastic adhesive has high elasticity and strong bonding force, has excellent allowable strain and allowable stress, is widely used for bonding products such as glass, metal, composite materials and the like, and is commonly applied to bonding, sealing and waterproofing of products such as front windows, head covers, side windows, floors, skins, seats and the like in the field of rail transit; among them, the elastic adhesives such as polyurethane, modified silane, etc. are most widely applied, and the excellent properties provided by them are as follows: 1) high elasticity; 2) low creep and resistance to relaxation; 3) high strength; 4) resisting damp-heat aging; 5) excellent ultraviolet resistance; 6) excellent thixotropic ability; 7) fatigue strength for long life cycles.
Before the elastic adhesive for the rail transit field enters a factory, the adhesive bonding capacity of the adhesive is usually detected by a shear test, but the shear test result is greatly influenced by a sample base material and the surface treatment of the base material, the number of samples is large, the preparation process is complex, and the whole process is low in efficiency. The tensile test can reflect the adhesive performance of the product more, the test result has few influencing factors, and the method is an effective method for replacing the shear test, but the existing sample preparation process of the test has the following limitations:
1) at present, a dumbbell-shaped mold curing film forming method is mostly adopted for sample preparation, the mold can only prepare one sample each time, and at least 5 samples are needed for testing, so that the sample preparation method needs a large number of molds;
2) the dumbbell-shaped die is small in size and inconvenient to operate and clean.
3) The dumbbell type die is small in size, the sample preparation film has air holes inevitably, the test result is influenced, the prepared film cannot be used, and the sample preparation qualified rate is low;
4) when the dumbbell-shaped die is used, the phenomenon of flash easily exists when the film is demoulded, the flash part needs to be trimmed, the cuts around the film are not consistent, and the test result is inaccurate.
5) Besides the sample preparation method of the dumbbell type die by curing and film forming, the sample preparation method of the dumbbell type die by extrusion film forming also exists, and the sample preparation method has the advantages of small contact area of the liquid adhesive and air and long curing time period.
The analysis shows that the conventional sample preparation method for the tensile test has the defects that the test efficiency is greatly influenced by factors such as a large number of required molds, low sample preparation qualification rate, long curing period and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the technical defects and provide a sample preparation method for factory inspection of the elastic adhesive.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a sampling method for factory inspection of elastic adhesives comprises the following steps:
(1) extruding an adhesive sample at one end of a rectangular mould groove, and filling the adhesive in the whole mould groove by using a metal scraper along the same direction;
(2) pushing out the redundant adhesive along one end of the mold by using a glass rod to form an adhesive layer with a horizontal surface;
(3) curing the prepared mould at room temperature for a certain time, and directly demoulding;
(4) after demolding, the film was cut into test specimens with a cutter of a predetermined type.
Preferably, the amount of the adhesive sample in the step 1) is 200 g.
Preferably, the material of the mold used in the step 1) is a high-gloss PTFE material.
Preferably, the outer edge of the die used in step 1) is 250mm x 200mm, the inner groove is 220mm x 160mm, the designed groove depth is 2mm (2mm is the thickness 2mm + -0.2 mm required by the standard rubber product test), and the edge of the groove is chamfered at 45 degrees.
Preferably, the glass rod in step 2) has a diameter of 10mm and a length of 400 mm.
Preferably, the curing temperature in step 3) is (25 +/-2) DEG C, and the time is as follows: 24h-48 h.
Preferably, the cutter in the step 4) is generally dumbbell-shaped, and can be customized to a special shape according to requirements.
The invention has the beneficial effects that: the sample preparation method is simple and convenient to operate, low in sample preparation cost and high in efficiency, the surface of the film prepared by the method is flat, the defects such as bubbles and flash are few, different test sample strips can be prepared by matching with different cut-off knives, and meanwhile, the defect positions can be selectively avoided, so that the quality of the sample strips is greatly improved, a good premise is provided for adhesive performance detection, the accuracy of detection data is improved, batch detection is realized, and the detection efficiency is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a sample preparation process of a rectangular mold by using an adhesive.
FIG. 2 is a schematic diagram of a dumbbell mold adhesive sample preparation finished product.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
With reference to the attached drawings, a factory inspection sample preparation method of an elastic adhesive takes a polyurethane adhesive as an example, and comprises the following steps:
(1) extruding 200g of a polyurethane structural adhesive sample at one end of a PTFE mold groove with the outer edge dimension of 250mm x 200mm, the inner groove dimension of 220mm x 160mm x 2mm and the groove edge chamfer angle of 45 degrees, and filling the whole PTFE mold groove with the polyurethane structural adhesive along the same direction by using a metal scraper;
(2) pushing out the redundant polyurethane structural adhesive along one end of the PTFE mold by using a glass rod with the diameter of 10mm and the length of 400mm to form a polyurethane structural adhesive layer with a horizontal surface;
(3) curing the prepared PTFE mold at room temperature for 36h, and directly demolding;
(4) cutting the polyurethane structural adhesive sheet into test sample strips by using a dumbbell cutter after demolding;
according to the invention, the PTFE material is adopted to manufacture the mold, the lower the surface roughness of the material is, the better the material is, the material is not bonded with the adhesive, no release agent or release paper is required to be added in the sample preparation process, and the curing and mechanical properties of the adhesive are not influenced. The method can form the polyurethane structural adhesive sheet with the thickness of 220mm by 160mm by 2mm in one step, the thickness of 2mm meets the test thickness requirement of standard rubber, and meanwhile, the method is favorable for full contact of the adhesive with air and water vapor and easy full curing. In addition, the edges of the grooves are chamfered at 45 degrees, and the design is favorable for exhausting gas and demoulding the rubber sheet in the sample preparation process. The formed film can be directly cut into samples by a cutter, and 8-10 samples at most can be cut, thereby completely meeting the requirement of 5 experimental sample strips. Meanwhile, the film can be cut into different types of tensile sample strips and sample strips of different test items according to different test requirements. The film prepared by the method can selectively avoid the defect positions of air holes, flash, uneven thickness and the like when cutting samples, the sample preparation qualification rate is up to 95 percent, and the TDS technical requirements of the adhesive are completely met.
The method only needs one person to prepare the sample, does not need other auxiliary equipment and tools, does not need complex cleaning operation after the sample preparation is finished, and the mold and the glass rod can be reused after demolding. The sample preparation time is shortened to 10min from the original 8h, and the working efficiency is greatly improved.
The present invention and the embodiments thereof have been described above, but the description is not limited to the embodiments, but only one of the embodiments of the present invention, and the actual embodiments are not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A sampling method for factory inspection of elastic adhesives is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) extruding an adhesive sample at one end of a rectangular mould groove, and filling the adhesive in the whole mould groove by using a metal scraper along the same direction;
(2) pushing out the redundant adhesive along one end of the mold by using a glass rod to form an adhesive layer with a horizontal surface;
(3) curing the prepared mould at room temperature for a certain time, and directly demoulding;
(4) after demolding, the film was cut into test specimens with a cutter of a predetermined type.
2. The method for preparing a sample for factory inspection of the elastic adhesive according to claim 1, wherein the method comprises the following steps: the sample amount of the adhesive in the step 1) is 200 g.
3. The method for preparing a sample for factory inspection of the elastic adhesive according to claim 1, wherein the method comprises the following steps: the material of the mould used in the step 1) is a high-glossiness PTFE material.
4. The method for preparing a sample for factory inspection of the elastic adhesive according to claim 1, wherein the method comprises the following steps: the size of the outer edge of the die used in the step 1) is 250mm x 200mm, the size of the inner groove is 220mm x 160mm, the depth of the designed groove is 2mm, and the edge of the groove is chamfered by 45 degrees.
5. The method for preparing a sample for factory inspection of the elastic adhesive according to claim 1, wherein the method comprises the following steps: the diameter of the glass rod in the step 2) is 10mm, and the length is 400 mm.
6. The method for preparing a sample for factory inspection of the elastic adhesive according to claim 1, wherein the method comprises the following steps: in the step 3), the curing temperature condition is 25 +/-2 ℃, and the time condition is as follows: 24h-48 h.
7. The method for preparing a sample for factory inspection of the elastic adhesive according to claim 1, wherein the method comprises the following steps: the cutter in the step 4) is generally in a dumbbell shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011293802.8A CN112485097A (en) | 2020-11-18 | 2020-11-18 | Sample preparation method for factory inspection of elastic adhesive |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011293802.8A CN112485097A (en) | 2020-11-18 | 2020-11-18 | Sample preparation method for factory inspection of elastic adhesive |
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| CN112485097A true CN112485097A (en) | 2021-03-12 |
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| CN202011293802.8A Pending CN112485097A (en) | 2020-11-18 | 2020-11-18 | Sample preparation method for factory inspection of elastic adhesive |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018679A (en) * | 2021-10-19 | 2022-02-08 | 深圳市卓宝科技股份有限公司 | Sample preparation method for non-cured coiled material |
| CN114323870A (en) * | 2022-01-06 | 2022-04-12 | 中国建筑科学研究院有限公司 | Preparation method of high-viscosity adhesive colloid performance sample |
-
2020
- 2020-11-18 CN CN202011293802.8A patent/CN112485097A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018679A (en) * | 2021-10-19 | 2022-02-08 | 深圳市卓宝科技股份有限公司 | Sample preparation method for non-cured coiled material |
| CN114018679B (en) * | 2021-10-19 | 2024-03-26 | 深圳市卓宝科技股份有限公司 | Non-solidified coiled material sample preparation method |
| CN114323870A (en) * | 2022-01-06 | 2022-04-12 | 中国建筑科学研究院有限公司 | Preparation method of high-viscosity adhesive colloid performance sample |
| CN114323870B (en) * | 2022-01-06 | 2023-12-22 | 中国建筑科学研究院有限公司 | Preparation method of high-viscosity adhesive colloid performance sample |
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