阅读说明：本技术 一种利用恒温水浴处理失效胶的方法 (Method for treating failure glue by using constant-temperature water bath ) 是由 曹阳 许天委 张晓琳 丁兆建 吴小霞 于 2019-11-08 设计创作，主要内容包括：本发明公开了一种利用恒温水浴处理失效胶的方法,包括以下步骤,使胶棒的粘性失效：将一只质量为m<Sub>s</Sub>标记为1号的胶棒暴露在空气中,将另一只胶棒放在鼓风电热恒温干燥箱中,烘烤失效,此胶棒标记为2号；将已失效的2号胶棒置于纱布上放置在数显恒温水浴锅上,用一个大烧杯将胶块罩住,调节水浴锅的温度,设定不同时间,分别取出胶块,查看其粘性恢复的效果；进行粘接性能的测定；将恢复粘性的胶块在20～40℃的环境温度下贮存一定的时间,再检验其使用效果。本发明的有益效果为：在恒温水浴锅上80℃的水温蒸30min,粘性恢复效果较好,用简单易行的方式恢复胶棒的粘性,减少产品的废弃率,这对节约资源,减小环境污染具有一定的意义。(The invention discloses a method for treating failure glue by using a constant-temperature water bath, which comprises the following steps of: one mass is m s Exposing the glue stick marked as No. 1 in the air, placing the other glue stick in a blast electric heating constant temperature drying oven, and baking to lose efficacy, wherein the glue stick is marked as No. 2; placing the failed No. 2 glue stick on gauze, placing on a digital display constant-temperature water bath kettle, covering the glue block with a big beaker, adjusting the temperature of the water bath kettle, setting different time, respectively taking out the glue block, and checking the viscosity recovery effect; measuring the bonding performance; and storing the adhesive blocks with recovered viscosity at the ambient temperature of 20-40 ℃ for a certain time, and then inspecting the using effect of the adhesive blocks. The invention has the beneficial effects that: the method has the advantages that the method can be used for steaming the glue stick for 30min at the temperature of 80 ℃ in a constant-temperature water bath kettle, the viscosity recovery effect is good, the viscosity of the glue stick is recovered in a simple and easy mode, the rejection rate of the product is reduced, and the method has certain significance for saving resources and reducing environmental pollution.)

1. A method for treating failure glue by using a constant-temperature water bath is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

(1) rendering the adhesive of the glue stick ineffective: one mass is m_sThe glue stick labeled No. 1 was exposed to air and the mass remaining was measured every 2 days and recorded as m_n(n is 2, 4, 6.) and the mass is recorded as m after the glue stick completely fails_tCalculating the mass residual rate and mass loss change rate of the glue stick,

placing the other glue stick in a blast electric heating constant temperature drying oven, setting the temperature at 80 ℃, baking for 40min, and then failing, wherein the glue stick is marked as No. 2, and the glue stick without any treatment is marked as No. 3;

(2) restoring the viscosity of the glue stick: cutting a failed No. 2 glue stick into small pieces, placing on a gauze, placing the gauze and the failed glue stick on a digital display constant temperature water bath kettle, covering the glue stick with a big beaker to prevent the dissipation of steam, adjusting the temperature of the water bath kettle to 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃ and setting time to 10min, 20min, 30min, 40min and 50min, respectively taking out the glue sticks, and checking the effect of viscosity recovery;

(3) test method for tack recovery:

a) measurement of adhesive Property peeling test: the method comprises the following steps of (1) horizontally placing kraft paper and newsprint, drawing squares on the kraft paper and the newsprint, coating a glue block used for a stickiness recovery test in a region where the squares are drawn, then bonding the coated paper with paper of the same material and the same size, pressing with fingers, after 8min, pressing one end without the coated glue with a left hand, stripping at 180 degrees, calculating the damaged area of the material with the squares, wherein the larger the damaged area is, the better the stickiness recovery is;

b) and (3) measuring the viscosity retention time after the viscosity is recovered, namely storing the viscosity-recovered rubber block for a certain time at the ambient temperature of 20-40 ℃, and then testing the using effect of the rubber block.

Technical Field

The invention relates to the technical field of solid glue, in particular to a method for treating ineffective glue by utilizing a constant-temperature water bath.

Background

In recent years, the development of adhesives is relatively extensive, such as nano adhesives, high temperature resistant adhesives, ultralow temperature adhesives, conductive adhesives, magnetic conductive adhesives, sealing adhesives, photosensitive adhesives and the like. Solid glue also belongs to one of the adhesives. Nowadays, solid glue is widely used, and is used in offices, students for doing homework and other places. Most of the major components of solid gums used in our daily lives are polyvinyl alcohol. Polyvinyl alcohol (PVA) has good adhesion to porous, hydrophilic surfaces such as wood, paper, textiles, and leather surfaces, and is used in large quantities to produce products such as adhesives, coatings, emulsifiers, textiles, paper processing agents, and plastic films.

The solid glue stick is a thing that is often used in our daily life, and convenient to carry and use are sanitary, and the wide application bonds various types of paper, and very practical office supplies, and market prospect is very wide. The solid glue stick uses PVA as raw materials mostly, in unsealing the back use, especially when having bad habit, when untimely lid of gluing stick was covered to the back after the usefulness, the solid glue stick is dried up the sclerosis very easily, paints the resistance increase, loses adhesive property, therefore can not continue to use, causes the waste of product and the pollution to the environment. At present, domestic researches on novel solid glue sticks are more, such as environmental protection, better adhesion, water resistance and long time for maintaining adhesion. But there has been little investigation into how to recover the tack of a failed solid glue stick. The method adopts a simple and easy way to recover the viscosity of the glue stick and reduce the abandonment rate of the product, which has certain significance for saving resources and reducing environmental pollution.

Disclosure of Invention

The invention aims to overcome the technical defects and provides a method for treating the failure glue by using a constant-temperature water bath.

In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a method for treating failure glue by using a constant-temperature water bath comprises the following steps,

(1) rendering the adhesive of the glue stick ineffective: one mass is m_sThe glue stick labeled No. 1 was exposed to air and the mass remaining was measured every 2 days and recorded as m_n(n is 2, 4, 6.) and the mass is recorded as m after the glue stick completely fails_tCalculating the mass residual rate and mass loss change rate of the glue stick,

placing the other glue stick in a blast electric heating constant temperature drying oven, setting the temperature at 80 ℃, baking for 40min, and then failing, wherein the glue stick is marked as No. 2, and the glue stick without any treatment is marked as No. 3;

(2) restoring the viscosity of the glue stick: cutting a failed No. 2 glue stick into small pieces, placing on a gauze, placing the gauze and the failed glue stick on a digital display constant temperature water bath kettle, covering the glue stick with a big beaker to prevent the dissipation of steam, adjusting the temperature of the water bath kettle to 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃ and setting time to 10min, 20min, 30min, 40min and 50min, respectively taking out the glue sticks, and checking the effect of viscosity recovery;

(3) test method for tack recovery:

a) measurement of adhesive Property peeling test: the method comprises the following steps of (1) horizontally placing kraft paper and newsprint, drawing squares on the kraft paper and the newsprint, coating a glue block used for a stickiness recovery test in a region where the squares are drawn, then bonding the coated paper with paper of the same material and the same size, pressing with fingers, after 8min, pressing one end without the coated glue with a left hand, stripping at 180 degrees, calculating the damaged area of the material with the squares, wherein the larger the damaged area is, the better the stickiness recovery is;

b) and (3) measuring the viscosity retention time after the viscosity is recovered, namely storing the viscosity-recovered rubber block for a certain time at the ambient temperature of 20-40 ℃, and then testing the using effect of the rubber block.

The invention has the beneficial effects that: the method has the advantages that the method can be used for steaming the glue stick for 30min at the temperature of 80 ℃ in a constant-temperature water bath kettle, the viscosity recovery effect is good, the viscosity of the glue stick is recovered in a simple and easy mode, the rejection rate of the product is reduced, and the method has certain significance for saving resources and reducing environmental pollution.

Drawings

FIG. 1 shows the mass remaining rate and the mass loss rate of change of No. 1 glue stick exposed to air.

FIG. 2 is a chart comparing the infrared spectra of No. 1 glue stick and No. 3 glue stick.

FIG. 3 is a chart showing IR contrast spectra of bake-out and no treatment of the gum bars.

FIG. 4 is a graph showing the effect of viscosity recovery of a mass treated with a constant temperature water bath.

FIG. 5 is a comparison graph of infrared spectra of the recovered glue and normal glue treated with a constant temperature water bath.

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.

A method for treating failure glue by using a constant-temperature water bath comprises the following steps,

(1) rendering the adhesive of the glue stick ineffective: one mass is m_sThe glue stick labeled No. 1 was exposed to air and the mass remaining was measured every 2 days and recorded as m_n(n is 2, 4, 6.) and the mass is recorded as m after the glue stick completely fails_tCalculating the mass residual rate and mass loss change rate of the glue stick,

placing the other glue stick in a blast electric heating constant temperature drying oven, setting the temperature at 80 ℃, baking for 40min, and then failing, wherein the glue stick is marked as No. 2, and the glue stick without any treatment is marked as No. 3;

(2) restoring the viscosity of the glue stick: cutting a failed No. 2 glue stick into small pieces, placing on a gauze, placing the gauze and the failed glue stick on a digital display constant temperature water bath kettle, covering the glue stick with a big beaker to prevent the dissipation of steam, adjusting the temperature of the water bath kettle to 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃ and setting time to 10min, 20min, 30min, 40min and 50min, respectively taking out the glue sticks, and checking the effect of viscosity recovery;

(3) test method for tack recovery:

a) measurement of adhesive Property peeling test: the method comprises the following steps of (1) horizontally placing kraft paper and newsprint, drawing squares on the kraft paper and the newsprint, coating a glue block used for a stickiness recovery test in a region where the squares are drawn, then bonding the coated paper with paper of the same material and the same size, pressing with fingers, after 8min, pressing one end without the coated glue with a left hand, stripping at 180 degrees, calculating the damaged area of the material with the squares, wherein the larger the damaged area is, the better the stickiness recovery is;

b) and (3) measuring the viscosity retention time after the viscosity is recovered, namely storing the viscosity-recovered rubber block for a certain time at the ambient temperature of 20-40 ℃, and then testing the using effect of the rubber block.

Analysis and characterization of results

(1) The performance and characterization of the glue stick exposed to air:

the mass remaining rate and the mass loss change rate of the glue stick with the lid opened (No. 1 glue stick) are shown in FIG. 1. As can be seen from fig. 1, if the glue stick used in daily life forgets to cover the cap, the mass of the glue stick will be reduced by 35.47% in about 20 days, and the glue stick will become shriveled and lose its viscosity. It can be seen from the mass loss rate curve that the mass loss rate is maximum in the first two days and then gradually decreases, probably because the moisture on the outer surface firstly loses viscosity, the outer surface is compact and elastic, and the rate of migration and diffusion of the internal moisture to the outside is hindered, so the mass loss rate decreases.

The ir spectra of glue stick No. 1 (exposed to air) versus glue stick No. 3 (glue stick without any treatment) are shown in fig. 2. According to the comparison map, the infrared spectrum of the glue stick exposed in the air does not generate a new characteristic peak, which indicates that no new substance is generated to cause the glue stick to fail, so that the failure of the glue stick can be seen as physical failure. The contrast map shows that the contrast map is 3000-3500 cm^-1There is an absorption band, which is the characteristic vibrational frequency of-OH. But at 3317cm^-1The signal peak of the solid gum exposed to air is reduced, because moisture is lost in air. In order to prove the conclusion, a new glue stick is taken and placed in a blast electric heating constant temperature drying oven, after the glue stick is baked for 40min at 80 ℃, the glue stick is invalid (namely the glue stick No. 2), the infrared spectrum of the glue stick is compared with the spectrum of the glue stick No. 3 (the glue stick without any treatment) as shown in figure 3, and therefore, the glue stick which is invalid after being baked does not have a new characteristic peak, the glue stick is proved to be invalid and is proved to be invalid physically invalid, and the conclusion is correct. The glue sticks dry out, resulting in failure due to loss of moisture.

(2) Analysis of results of constant temperature Water bath treatment

The adhesive blocks are respectively treated by steaming and boiling at 50-100 deg.C in a constant temperature water bath for 10-50min, and the adhesive recovery effect of the adhesive blocks is shown in FIG. 4. In fig. 4, "-" indicates no tackiness; "+" indicates that the destruction rate is 0-25% in the peeling test; "+ +" indicates a destruction rate of 25% to 50%; "+ + + +" indicates a failure rate of 50% to 75%; "+ ++" indicates a destruction rate of 75% to 100%. As can be seen from FIG. 4, the tack was recovered by steaming the spent solid glue stick on a water bath at 80 ℃ for 20min, but the tack retention time was very short. Below 80 c, the water vapor is not sufficient to allow the failed glue block to absorb moisture and thus fail to recover tack. Above 80 deg.C, the block melts gradually to recover part of viscosity, but the effect is much worse than 80 deg.C. The infrared contrast spectra of the double effect glue and the normal glue are shown in figure 5. As can be seen from FIG. 5, after the failed glue block is steamed in a constant temperature water bath to recover the viscosity, no new characteristic peak appears in the infrared spectrum, and the-OH peak at 3326cm-1 is similar to that of the normal glue. It can be seen that the solid gum has recovered its effect due to the water returning to the interior of the gum.

(3) Durability of the acid-treated double effect adhesive: the test shows that the retention time of the adhesive performance of the multi-effect adhesive treated by the water bath is about 1 min.

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 conclusion, 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.