CN112986132A - Method for testing adhesion fastness of hot melt adhesive - Google Patents
Method for testing adhesion fastness of hot melt adhesive Download PDFInfo
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- CN112986132A CN112986132A CN202110162776.3A CN202110162776A CN112986132A CN 112986132 A CN112986132 A CN 112986132A CN 202110162776 A CN202110162776 A CN 202110162776A CN 112986132 A CN112986132 A CN 112986132A
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- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The embodiment of the invention discloses a method for testing the adhesion fastness of a hot melt adhesive, which comprises the following steps: obtaining a hot melt adhesive material; placing the hot melt adhesive material on a first mold; simultaneously placing the first mold and a second mold, on which the hot melt adhesive material is not placed, into an oven, the first mold and the second mold being heated by the oven; when the hot-melt adhesive material is heated to a molten state, bonding the second mold and the first mold through the hot-melt adhesive material to obtain a third mold, then moving the third mold out of the oven, and standing at normal temperature for a preset time; and carrying out tensile test on the third die until the third die is separated, recording the tensile strength when the first die and the second die are completely separated, processing the tensile strength data of a plurality of groups of parallel samples, and calculating the average tensile strength by using a formula. The testing method for the adhesion fastness of the hot melt adhesive is realized through the steps, and compared with the existing testing method for the melt viscosity, the testing method has the advantages of wide application range, simplicity and convenience in testing operation and high testing efficiency.
Description
Technical Field
The invention relates to the technical field of hot melt adhesive adhesion fastness testing, in particular to a method for testing the adhesion fastness of a hot melt adhesive.
Background
The hot melt adhesive is a plastic adhesive, the physical state of which changes along with the change of temperature within a certain temperature range, and the chemical property of which is unchanged, is nontoxic and tasteless, and belongs to an environment-friendly chemical product. The product is solid, so the product is convenient to package, transport and store, and has no solvent, pollution or toxicity; and the production process is simple, the added value is high, the bonding strength is high, the speed is high, and the like, so that the adhesive is favored.
The sealing technology of the hot melt adhesive is characterized in that the hot melt adhesive sealing technology is high in efficiency, convenient and environment-friendly, replaces the traditional packing modes such as bundling type packing, adhesive tape packing and the like in a large area at present, and is widely applied to the fields of mechanical packing, furniture manufacturing, wireless binding, electronic components, daily necessities bonding and the like.
The EVA hot melt adhesive is prepared by melting and mixing EVA resin (ethylene-vinyl acetate copolymer), tackifying resin, additives and other compounding agents, has the advantages of good processing flowability, excellent chemical resistance, thermal stability, quick bonding, wide application range, no toxicity, no pollution, low price, convenient use and the like, and quickly becomes one of the most widely applied and most used hot melt adhesives.
The melt viscosity of the hot melt adhesive is liquid after the hot melt adhesive is heated and melted, and the viscosity of the liquid during flowing is used for representing resistance factors related to the liquid property, namely the melt viscosity represents the viscosity of the hot melt adhesive. In HG/T3660 "determination of melt viscosity of hot melt adhesive", the determination of melt viscosity of hot melt adhesive at 180 ℃ is specified, and the test principle is that a certain amount of hot melt adhesive is heated under a given condition, when the temperature of hot melt adhesive reaches the test temperature, a proper viscometer rotor and rotation speed are selected, the viscometer is started, and the viscosity value is recorded.
However, the hot melt adhesives supplied by different suppliers have the disadvantages of different melt viscosities and large deviation of bonding strength in the production process, which results in that all parts of the article to be bonded have insufficient bonding force and are cracked, thereby affecting the quality of finished products, such as: the bonding between the independent section of thick bamboo of non-woven fabrics parcel, because the difference of different bonding position atress circumstances and area of contact between each other are different, also has different requirements to the bonding strength of colloid during the bonding, so the colloid volume of different positions retention when the hot melt adhesive adopts the machine spraying is different, and the bonding strength can have the difference, if the bonding strength of colloid can not reach essential requirement, then leads to independent section of thick bamboo bonding insecure, influences follow-up finished product preparation. Therefore, the melt viscosity value of the hot melt adhesive needs to be known in advance to select the proper hot melt adhesive. However, the melt viscosity index needs to be inspected by a third-party inspection mechanism, the inspection time is long, and the cost is increased for each batch of inspection.
Therefore, it is urgently needed to invent a method for testing the adhesion fastness of the hot melt adhesive, which is simple and convenient to operate and high in testing efficiency, and manages and controls the adhesion fastness of the hot melt adhesive.
Disclosure of Invention
The invention aims to provide a method for testing the adhesion fastness of a hot melt adhesive, so that the operation of testing the adhesion fastness of the hot melt adhesive is simple and convenient, and the testing efficiency is improved.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for testing the adhesion fastness of a hot melt adhesive comprises the following steps:
obtaining a hot melt adhesive material;
placing the hot melt adhesive material on a first mold;
simultaneously placing the first mold and a second mold, on which the hot melt adhesive material is not placed, into an oven, the first mold and the second mold being heated by the oven;
when the hot-melt adhesive material is heated to a molten state, bonding the second mold and the first mold through the hot-melt adhesive material to obtain a third mold, then moving the third mold out of the oven, and standing at normal temperature for a preset time;
carrying out a tensile test on the third mold until the third mold is separated, and recording the tensile strength F when the first mold and the second mold are completely separatedi。
Further, the hot melt adhesive material is 0.7-0.9 g.
Further, the first die and the second die are both square steel dies, and the contact surfaces of the first die and the second die are both 5 x 5 cm.
Further, the baking temperature of the oven is 148-152 ℃.
Further, the heating time of the oven is 15-25 min.
Further, the tensile test specifically comprises:
using a wood universal testing machine to carry out a tensile test at a tensile speed of 40-60mm/min until the third die is completely moldedAt the time of detachment, the tensile strength F is recordedi。
Further, a plurality of groups of third molds are obtained, and the tensile test is carried out to obtain a plurality of groups of tensile strengths FiThe numerical value of (c).
Further, the method also comprises the following steps: and calculating a plurality of sets of said tensile strengths FiAverage value of (a).
Further, said calculating said plurality of sets of said tensile strengths FiThe average value of (a) is specifically:
obtaining N corresponding tensile strengths F based on N groups of bonded third moldsiN is a positive integer greater than or equal to 5; after removing a maximum and a minimum, N-2 of said tensile strengths F remainiSequentially reported as tensile strength No. 1F 1 to tensile strength No. N-2FN-2Calculating said tensile strength FiThe method of averaging of (1) comprises:
setting the tensile strength FiIs F, calculated using the following formula:
the invention has the beneficial effects that: the embodiment of the invention provides a method for testing the adhesion fastness of a hot melt adhesive, which comprises the steps of obtaining a hot melt adhesive material; placing the hot melt adhesive material on a first mold; simultaneously placing the first mold and a second mold, on which the hot melt adhesive material is not placed, into an oven, the first mold and the second mold being heated by the oven; when the hot-melt adhesive material is heated to a molten state, bonding the second mold and the first mold through the hot-melt adhesive material to obtain a third mold, then moving the third mold out of the oven, and standing at normal temperature for a preset time; and carrying out a tensile test on the third mold until the third mold is separated, and calculating the tensile strength when the first mold and the second mold are completely separated. Compared with the method for testing the melt viscosity specified in the existing national standard HG/T3660, the method for testing the hot melt adhesive fastness has the following advantages because the reaction conditions are adjusted and the testing instrument is replaced:
the testing method has wide application range, and is particularly suitable for EVA hot melt adhesives, PA hot melt adhesives, pressure-sensitive hot melt adhesives and the like.
Secondly, the technical scheme of the testing method is simple in steps, simple and convenient to operate, low in requirements on instruments used for testing, low in testing dosage of the hot melt adhesive, low in melting temperature, more suitable for actual production and use temperatures, low in testing cost and more suitable for industrial application.
And thirdly, compared with the viscosity and the fluidity of the hot melt adhesive, the melt viscosity obtained by the national standard test shows that the tensile strength of the tightly bonded die is obtained by the test method through the tensile test, and the operation can simulate and reappear the actual use scene of the hot melt adhesive, for example: the strength of the adhesive fabric, the composite layer, the non-woven fabric and the like is intuitively reflected.
Compared with the prior art, the testing method has the advantages of wide application range, simplicity and convenience in operation, low testing cost, suitability for industrial application and the like, and can achieve the technical effect of testing the adhesion fastness of the hot melt adhesive in a short time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating steps of a method for testing adhesion fastness of a hot melt adhesive according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method for testing the adhesion fastness of a hot melt adhesive, so that the operation of testing the adhesion fastness of the hot melt adhesive is simple and convenient, and the testing efficiency is improved.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below 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.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Referring to fig. 1, as shown in fig. 1, a flowchart of steps of a method for testing adhesion fastness of a hot melt adhesive provided by an embodiment of the present invention specifically includes the following main steps:
step 101: obtaining a hot melt adhesive material;
step 102: placing the hot melt adhesive material on a first mold;
step 103: simultaneously placing the first mold and a second mold, on which the hot melt adhesive material is not placed, into an oven, the first mold and the second mold being heated by the oven;
step 104: when the hot-melt adhesive material is heated to a molten state, bonding the second mold and the first mold through the hot-melt adhesive material to obtain a third mold, then moving the third mold out of the oven, and standing at normal temperature for a preset time;
step 105: carrying out a tensile test on the third mold until the third mold is separated, and recording the tensile strength F when the first mold and the second mold are completely separatedi。
Example one
Specifically, the first die and the second die are square steel dies, the contact surface of the first die and the second die is 5 × 5cm, 0.7g of hot melt adhesive material is weighed, 0.7g of hot melt adhesive material is placed on the first die, the first die and the second die are placed into an oven, the baking temperature of the oven is set to be 148 ℃, the heating time of the oven is set to be 15min, the second die is adhered to the first die after the hot melt adhesive material is heated until the hot melt adhesive material is in a hot melt state, the two dies are tightly adhered to form a third die, then the third die is moved out of the oven, and the third die is placed at normal temperature for more than 4 hours; and (3) performing a tensile test at a tensile speed of 40mm/min by using a wood universal tester until the tensile strength Fi is completely separated, so as to obtain the tensile strength Fi.
And (4) repeating the steps 101 to 104 to sample 5 groups of hot melt adhesive materials to obtain 5 groups of bonded molds, performing tensile test on the 5 groups of bonded molds to obtain 5 groups of tensile strength values, and calculating the average value of the 5 groups of tensile strengths. The average value of the 5 groups of tensile strengths is calculated as follows:
the values of the 5 groups of tensile strength are arranged in ascending order, N is 5, and the values are respectively marked as F1、F2、F3、 F4、F5In order to reduce the error, 1 maximum value and 1 minimum value are removed during calculation, the middle 3 groups of data are taken, and the average tensile strength F is calculated by using the following formula:
example two
Specifically, the first mold and the second mold are square steel molds, the contact surface of the first mold and the second mold is 5 × 5cm, 0.9g of hot melt adhesive material is weighed, 0.9g of hot melt adhesive material is placed on the first mold, the first mold and the second mold are placed into an oven, the baking temperature of the oven is set to 152 ℃, the heating time of the oven is set to 25min, the second mold is adhered to the first mold after the hot melt adhesive material is heated until the hot melt adhesive material is in a hot melt state, the two molds are tightly adhered to form a third mold, and then the third mold is moved out of the oven and is placed at normal temperature for more than 4 hours; and (3) performing a tensile test at a tensile speed of 60mm/min by using a wood universal tester until the tensile strength Fi is completely separated, so as to obtain the tensile strength Fi.
And (4) repeating the steps 101 to 104 to sample 5 groups of hot melt adhesive materials to obtain 5 groups of bonded molds, performing tensile test on the 5 groups of bonded molds to obtain 5 groups of tensile strength values, and calculating the average value of the 5 groups of tensile strengths. The average value of the 5 groups of tensile strengths is calculated as follows:
the values of the 5 groups of tensile strength are arranged in ascending order, N is 5, and the values are respectively marked as F1、F2、F3、 F4、F5In order to reduce the error, 1 maximum value and 1 minimum value are removed during calculation, the middle 3 groups of data are taken, and the average tensile strength F is calculated by using the following formula:
in summary, the embodiment of the present invention provides a method for testing adhesion fastness of a hot melt adhesive, including the following steps: obtaining a hot melt adhesive material; placing the hot melt adhesive material on a first mold; simultaneously placing the first mold and a second mold, on which the hot melt adhesive material is not placed, into an oven, the first mold and the second mold being heated by the oven; when the hot-melt adhesive material is heated to a molten state, bonding the second mold and the first mold through the hot-melt adhesive material to obtain a third mold, then moving the third mold out of the oven, and standing at normal temperature for a preset time; and carrying out tensile test on the third die until the third die is separated, recording the tensile strength when the first die and the second die are completely separated, processing the tensile strength data of a plurality of groups of parallel samples, and calculating the average tensile strength by using a formula. The method for testing the adhesion fastness of the hot melt adhesive is realized through the steps, compared with the existing method for testing the melt viscosity, the method for testing the adhesion fastness of the hot melt adhesive has the advantages of wide application range, simplicity and convenience in operation, low testing cost, suitability for industrial application and the like, and can achieve the technical effect of testing the adhesion fastness of the hot melt adhesive in a short time.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; 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 (9)
1. The method for testing the adhesion fastness of the hot melt adhesive is characterized by comprising the following steps of:
obtaining a hot melt adhesive material;
placing the hot melt adhesive material on a first mold;
simultaneously placing the first mold and a second mold, on which the hot melt adhesive material is not placed, into an oven, the first mold and the second mold being heated by the oven;
when the hot-melt adhesive material is heated to a molten state, bonding the second mold and the first mold through the hot-melt adhesive material to obtain a third mold, then moving the third mold out of the oven, and standing at normal temperature for a preset time;
carrying out a tensile test on the third mold until the third mold is separated, and recording the tensile strength F when the first mold and the second mold are completely separatedi。
2. The method for testing the adhesion fastness of the hot melt adhesive according to claim 1, wherein the hot melt adhesive material is 0.7-0.9 g.
3. The method for testing the adhesion fastness of the hot melt adhesive according to claim 1, wherein the first die and the second die are both square steel dies, and the contact surfaces of the first die and the second die are both 5 x 5 cm.
4. The method for testing the adhesion fastness of the hot melt adhesive as claimed in claim 1, wherein the baking temperature of the oven is 148-152 ℃.
5. The method for testing the adhesion fastness of the hot melt adhesive according to claim 1, wherein the heating time of the oven is 15-25 min.
6. The method for testing the adhesion fastness of the hot melt adhesive according to claim 1, wherein the tensile test specifically comprises:
using a wood universal testing machine to carry out a tensile test at a tensile speed of 40-60mm/min until the third die is completely separated, and recording the tensile strength Fi。
7. The method for testing the adhesion fastness of the hot melt adhesive according to claim 1, wherein a plurality of groups of the third molds are obtained, and the tensile test is performed to obtain a plurality of groups of tensile strengths FiThe numerical value of (c).
8. The method for testing the adhesion fastness of the hot melt adhesive according to claim 7, is characterized by further comprising the following steps: and calculating a plurality of sets of said tensile strengths FiAverage value of (a).
9. The method for testing the adhesion fastness of a hot melt adhesive according to claim 8, wherein the plurality of groups of the tensile strengths F are calculatediThe average value of (a) is specifically:
obtaining N corresponding tensile strengths F based on N groups of bonded third moldsiN is a positive integer greater than or equal to 5; after removing a maximum and a minimum, N-2 of said tensile strengths F remainiSequentially reported as tensile strength No. 1F 1 to tensile strength No. N-2FN-2Calculating said tensile strength FiThe method of averaging of (1) comprises:
setting the tensile strength FiIs F, calculated using the following formula:
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Citations (7)
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| JPS5866837A (en) * | 1981-10-17 | 1983-04-21 | Mazda Motor Corp | Measuring method for adhesive strengh of film layer |
| JPH0427842A (en) * | 1990-05-23 | 1992-01-30 | Kanebo Nsc Ltd | Adhesive strength tester for hot melt adhesive |
| CN101466530A (en) * | 2006-05-26 | 2009-06-24 | 史蒂芬·扬 | A device for improving the consistency of an internal bond strength test on glued bio-based panel products |
| CN202196007U (en) * | 2011-08-16 | 2012-04-18 | 江苏泰尔新材料科技有限公司 | Peel strength testing device |
| CN104483264A (en) * | 2014-12-18 | 2015-04-01 | 上海天洋热熔粘接材料股份有限公司 | Novel evaluation method for bonding property of hot melt adhesive |
| CN107643246A (en) * | 2016-07-21 | 2018-01-30 | 新丰杰力电工材料有限公司 | A kind of detection method of heat sensitive adhesive tape adhesive force |
| CN111693560A (en) * | 2020-06-11 | 2020-09-22 | 西安交通大学 | Selection method of hot melt adhesive for crosslinked polyethylene cable smooth aluminum composite sheath |
-
2021
- 2021-02-05 CN CN202110162776.3A patent/CN112986132A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5866837A (en) * | 1981-10-17 | 1983-04-21 | Mazda Motor Corp | Measuring method for adhesive strengh of film layer |
| JPH0427842A (en) * | 1990-05-23 | 1992-01-30 | Kanebo Nsc Ltd | Adhesive strength tester for hot melt adhesive |
| CN101466530A (en) * | 2006-05-26 | 2009-06-24 | 史蒂芬·扬 | A device for improving the consistency of an internal bond strength test on glued bio-based panel products |
| CN202196007U (en) * | 2011-08-16 | 2012-04-18 | 江苏泰尔新材料科技有限公司 | Peel strength testing device |
| CN104483264A (en) * | 2014-12-18 | 2015-04-01 | 上海天洋热熔粘接材料股份有限公司 | Novel evaluation method for bonding property of hot melt adhesive |
| CN107643246A (en) * | 2016-07-21 | 2018-01-30 | 新丰杰力电工材料有限公司 | A kind of detection method of heat sensitive adhesive tape adhesive force |
| CN111693560A (en) * | 2020-06-11 | 2020-09-22 | 西安交通大学 | Selection method of hot melt adhesive for crosslinked polyethylene cable smooth aluminum composite sheath |
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