Fumed silica hardened solid glue stick and preparation method thereof

Abstract

The invention relates to a fumed silica hardened solid glue stick and a preparation method thereof, and the fumed silica hardened solid glue stick comprises the following raw materials by weight: 40-70 parts of deionized water; 10 to 25 parts of an adhesive; 0.1 to 1 part of fumed silica; 1 to 10 parts of propylene glycol; 1 to 10 parts of glycerol; 1-10 parts of fatty acid; and 1-5 parts of sodium hydroxide and 0.1-1 part of a preservative. According to the invention, fumed silica is used as a filling material, and through a physical and chemical interweaving effect formed by hydroxyl groups on the surface of the fumed silica and a matrix, the intermolecular acting force of the adhesive is enhanced, so that the hardness of the colloid is effectively improved, the tear resistance of the colloid is also improved, and the problem that the glue stick is easy to break in the use process is solved. The fumed silica and the stearate interact with each other, so that the hardness of the colloid is not easily influenced by the addition amount of a stearate shaping agent, the fumed silica and the stearate are dispersed more uniformly under the action of the dispersing agent, material gaps are fully filled with nanoscale particles, and the colloid hardening effect is more prominent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid glue, in particular to a fumed silica reinforced solid glue stick and a preparation method thereof. BACKGROUND

[0002] Solid glue is a common product in solid adhesives. Solid glue is mainly used for bonding paper and paper products, and is suitable for office workers, accountants, teachers, students and related groups. Its main features are: raw materials are easy to obtain, process is simple, shelf life is long, volume is small, use is convenient, and bonding is firm.

[0003] The solid glue stick products on the market mainly include PVP, PVA and ACR solid glue. PVP solid glue is widely welcomed by the market due to its excellent bonding performance. This type of solid glue is mostly prepared by adding a certain amount of excipient, humectant, preservative and the like to polyvinylpyrrolidone as the main adhesive. The ACR and PVA solid glue made of acrylic resin and polyvinyl alcohol on the market has excellent bonding performance and relatively low price, and is deeply welcomed by the market. However, the above-mentioned solid glue is easily affected by the performance of raw materials, and the addition of plasticizing agent in the production process needs to be strictly controlled, otherwise the glue will be softened and the residue will be affected during use.

[0004] At present, the solid glue using PVP, PVA and ACR base material generally solidifies the glue from liquid to solid by adding stearate plasticizing agent. However, the stearate plasticizing agent has the disadvantage that the addition amount is difficult to control. Too little or too much addition amount cannot effectively solidify the glue. Only by adding an appropriate amount of stearate plasticizing agent can the hardness of the glue be barely met, and the hardness of the glue cannot be further increased, which seriously limits the development of the hardness of the solid glue. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide a fumed silica reinforced solid glue stick capable of effectively improving the hardness, which is not dependent on the control of the use amount of stearate plasticizing agent.

[0006] The second technical problem to be solved by the present application is to provide a preparation method of the above-mentioned fumed silica reinforced solid glue stick.

[0007] The technical solution adopted by the present application to solve at least one of the above technical problems is as follows:

[0008] A fumed silica reinforced solid glue stick, according to the weight components, the raw materials used include the following components:

[0009] Deionized water 40-70 parts;

[0010] Adhesive 10-25 parts;

[0011] Fumed silica 0.1-1 part;

[0012] Propylene glycol 1-10 parts;

[0013] Glycerin 1-10 parts;

[0014] Fatty acid 1-10 parts;

[0015] Sodium hydroxide 1-5 parts

[0016] Preservative 0.1-1 part.

[0017] The present application creatively uses fumed silica as filler, and the physical and chemical interlacing effect is formed between the surface hydroxyl group and the matrix, the intermolecular force of the adhesive is enhanced, so that the hardness of the glue is effectively improved, the tear resistance of the glue is also improved, the problem of easy breaking during use of the glue stick is solved, and the glue stick is more durable.

[0018] The raw material of the fumed silica reinforced solid glue stick also includes 0.1-0.5 parts of dispersant, which is used to interweave the stearate formed by the fumed silica, the fatty acid and the sodium hydroxide and fill the gap of the glue. The present application uses the dispersant in a proper proportion to uniformly disperse the fumed silica in the glue to achieve the purpose of reinforcing the performance of the glue.

[0019] Preferably, the dispersant is dispersant ST-83. The dispersant is beneficial to further improve the compatibility of the components in the glue, so that the hardness of the glue is improved and remains stable.

[0020] Preferably, the dispersant is used to improve the surface activity of the fumed silica molecules, so that the fumed silica and the adhesive jointly act to improve the light-emitting time of the solid glue stick. Further preferably, the adhesive is 15-20 parts. The present application creatively explores that adding the fumed silica in the adhesive in a specific proportion can significantly improve the light-emitting time.

[0021] Preferably, the fumed silica is hydrophilic fumed silica, and the addition amount is 0.4-0.6 parts. The fumed silica of the present application needs to meet the invariability under alkaline conditions. The hydrophilic fumed silica can be better mixed in the glue and uniformly mixed with the adhesive, so that the fumed silica and the stearate are compatible with each other to fill the gap of the glue, and the hardness of the glue is further improved.

[0022] Preferably, the adhesive is selected from polyvinylpyrrolidone, acrylic resin and polyvinyl alcohol.

[0023] A fumed silica reinforced solid glue stick, comprising the following steps:

[0024] (1) Prepare raw materials according to the formula of the above-mentioned fumed silica reinforced solid glue stick;

[0025] (2) At room temperature, add deionized water, glycerol, adhesive, and propylene glycol into the reaction kettle, stir uniformly to obtain a mixed solution, and heat to 82-87℃; the stirring speed is 300-350 rpm / min, and the stirring time is 1-2 hours;

[0026] (3) While stirring, add fumed silica and dispersant, and stir for 30-60 min to make them fully mixed;

[0027] (4) While stirring, add fatty acid, and after stirring for 1-2 hours, mix uniformly, control the temperature at 82-87℃, and add the prepared 20-25% volume concentration sodium hydroxide aqueous solution to adjust the pH value of the system to 9-11;

[0028] (5) While stirring, add preservative, mix uniformly after constant temperature stirring for 30-60 min, and keep the temperature at 82-87℃, and stand for 3-4 hours to defoam;

[0029] (6) The defoamed solution in step (5) is filled to prepare a fumed silica reinforced solid glue stick.

[0030] Compared with the prior art, the advantages of the present application are that: the fumed silica is added to the traditional adhesives polyvinylpyrrolidone, polyvinyl alcohol, and acrylic resin as a filler, the physical and chemical interlacing effect is formed between the surface hydroxyl group and the matrix, the intermolecular force of the adhesive is enhanced, the hardness of the glue is effectively improved, the coating is smoother, the tear resistance of the glue is also improved, the problem of easy breaking during use is solved, and the glue stick is more durable; in addition, the fumed silica and the stearate interact with each other, the hardness of the glue is not easily affected by the amount of stearate plasticizer, the production convenience is improved, under the action of the dispersant, the fumed silica and the stearate are more uniformly dispersed, the nanoscale particles can fully fill the material voids, and the hardening effect of the glue is more prominent; compared with the traditional white solid glue stick, the solid glue of the present application has excellent coating smoothness, tear resistance, high hardness, high adhesive strength, long open time, safety and environmental protection, and excellent moisturizing effect. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below in combination with examples.

[0032] The fumed silica of the present embodiment is purchased from Shanghai Tuoyue New Material Technology Co., Ltd., the dispersant ST-83 is purchased from Zhenjiang Lianfeng Environmental Protection Chemical Co., Ltd., the fatty acid is purchased from Guangzhou Qilin Chemical Co., Ltd., and the preservative is purchased from Shenzhen Muxin Chemical Co., Ltd.

[0033] Example 1

[0034] The gas phase silica reinforced solid glue stick in this example was prepared from the following raw materials in the following proportions by weight:

[0035] Binder 20%; propylene glycol 4%; glycerol 5%; fatty acid 4%; sodium hydroxide 0.9%; gas phase silica 0.5%; preservative 0.125%, dispersant ST-83 0.3%, and the balance deionized water, the total of the above components being 100%.

[0036] The binder in this example was polyvinylpyrrolidone.

[0037] The gas phase silica reinforced solid glue stick was prepared as follows:

[0038] Deionized water, glycerol, binder, and propylene glycol were added to a reaction vessel and stirred to mix uniformly. The temperature was then raised to about 85°C while stirring at a rate of 300 rpm / min for 2 hours.

[0039] Gas phase silica and dispersant were added while stirring, and the mixture was stirred for 60 min to dissolve completely. Fatty acid was added while stirring, and the mixture was stirred for 2 hours until uniform. The temperature was controlled at 85°C, and an aqueous sodium hydroxide solution was added to adjust the pH of the system to 9-11. Preservative was added while stirring, and the mixture was stirred for 60 min at constant temperature. The mixture was stirred for 4 hours at constant temperature of about 85°C while allowing to stand to remove bubbles.

[0040] After complete defoaming, the gas phase silica reinforced solid glue stick was filled and prepared.

[0041] Example 2

[0042] The difference from Example 1 was that the binder was polyvinyl alcohol.

[0043] Example 3

[0044] The difference from Examples 1 and 2 was that the binder was acrylic resin.

[0045] Comparative Example 1

[0046] The gas phase silica reinforced solid glue stick in this example was prepared from the following raw materials in the following proportions by weight:

[0047] Binder 20%; propylene glycol 4%; glycerol 5%; fatty acid 4%; sodium hydroxide 0.9%; preservative 0.125%, dispersant ST-83 0.3%, and the balance deionized water, the total of the above components being 100%.

[0048] The binder in this example was polyvinylpyrrolidone.

[0049] The method for preparing the fumed silica reinforced solid glue stick is as follows:

[0050] Deionized water, glycerol, adhesive, and propylene glycol are added into a reactor at room temperature, and stirred to mix uniformly. After being dispersed, the temperature is raised to about 85°C, the stirring speed is 300 rpm / min, and the stirring time is 2 hours.

[0051] The dispersant is added while stirring, and stirred for 60 min to completely dissolve. The fatty acid is added while stirring, and stirred for 2 hours to mix uniformly. After the temperature is controlled at 85°C, the sodium hydroxide aqueous solution is added to adjust the pH value of the system to 9-11. The preservative is added while stirring, and stirred for 60 min to mix uniformly at constant temperature. The temperature is controlled at about 85°C, and the system is left to stand for 4 hours to remove bubbles.

[0052] After complete defoaming, the fumed silica reinforced solid glue stick is prepared by filling.

[0053] Comparative Example 2:

[0054] The fumed silica reinforced solid glue stick in the present comparative example is prepared from the following raw materials in the weight proportions:

[0055] Adhesive 20%; propylene glycol 4%; glycerol 5%; fatty acid 4%; sodium hydroxide 0.9%; fumed silica 0.5%; preservative 0.125%, and the rest is deionized water. The total of the above components is 100%.

[0056] The adhesive in the present comparative example is polyvinylpyrrolidone.

[0057] The method for preparing the fumed silica reinforced solid glue stick is as follows:

[0058] Deionized water, glycerol, adhesive, and propylene glycol are added into a reactor at room temperature, and stirred to mix uniformly. After being dispersed, the temperature is raised to about 85°C, the stirring speed is 300 rpm / min, and the stirring time is 2 hours.

[0059] The fumed silica is added while stirring, and stirred for 60 min to completely dissolve. The fatty acid is added while stirring, and stirred for 2 hours to mix uniformly. After the temperature is controlled at 85°C, the sodium hydroxide aqueous solution is added to adjust the pH value of the system to 9-11. The preservative is added while stirring, and stirred for 60 min to mix uniformly at constant temperature. The temperature is controlled at about 85°C, and the system is left to stand for 4 hours to remove bubbles.

[0060] After complete defoaming, the fumed silica reinforced solid glue stick is prepared by filling.

[0061] Comparative Example 3:

[0062] The solid glue stick in the present comparative example is prepared from the following raw materials in parts by weight:

[0063] Adhesive 20%; propylene glycol 4%; glycerol 5%; fatty acid 4%; sodium hydroxide 0.9%; preservative 0.125%, and the rest is deionized water, the total of the above components is 100%.

[0064] The adhesive in the present comparative example is polyvinylpyrrolidone.

[0065] The preparation method of the above solid glue stick is as follows:

[0066] At room temperature, deionized water, glycerol, adhesive, and propylene glycol are added into a reaction kettle and stirred to mix uniformly. After stirring and dispersing, the temperature is raised to about 85°C, the stirring speed is 300 rpm / min, and the stirring time is 2 hours;

[0067] Fatty acid is added while stirring, and after stirring and mixing uniformly for 2 hours, the temperature is controlled at 85°C. Sodium hydroxide solution is then added to adjust the pH value of the system to 9-11. Preservative is added while stirring, and after constant temperature stirring for 60 min, the mixture is mixed uniformly at constant temperature of about 85°C, and left to stand for 4 hours to remove bubbles.

[0068] After complete defoaming, filling is performed to obtain a fumed silica hardened solid glue stick.

[0069] Comparative Example 4:

[0070] The solid glue stick in the present comparative example is prepared from the following raw materials in parts by weight:

[0071] Adhesive 20%; propylene glycol 4%; glycerol 5%; fatty acid 9%; sodium hydroxide 2%; preservative 0.125%, and the rest is deionized water, the total of the above components is 100%.

[0072] The adhesive in the present comparative example is polyvinylpyrrolidone.

[0073] The preparation method of the above solid glue stick is as follows:

[0074] At room temperature, deionized water, glycerol, adhesive, and propylene glycol are added into a reaction kettle and stirred to mix uniformly. After stirring and dispersing, the temperature is raised to about 85°C, the stirring speed is 300 rpm / min, and the stirring time is 2 hours;

[0075] Fatty acid is added while stirring, and after stirring and mixing uniformly for 2 hours, the temperature is controlled at 85°C. Sodium hydroxide solution is then added to adjust the pH value of the system to 9-11. Preservative is added while stirring, and after constant temperature stirring for 60 min, the mixture is mixed uniformly at constant temperature of about 85°C, and left to stand for 4 hours to remove bubbles.

[0076] After complete defoaming, filling is performed to obtain a fumed silica hardened solid glue stick.

[0077] The fumed silica reinforced solid adhesive sticks prepared in Example 1 and Comparative Examples 1-4 were subjected to performance testing. The testing items and methods were strictly in accordance with GB / 21027-2020:

[0078] A. 100% of the material was torn, and the adhesive did not come off;

[0079] B. About 75% of the material was torn, and the adhesive did not come off;

[0080] C. About 50% of the material was torn, and the adhesive did not come off;

[0081] D. Adhesion, but not tearing of the material, and the adhesive came off;

[0082] The test results are as follows:

[0083]

[0084]

[0085] As can be seen from the above table, the addition of 0.5% fumed silica and a small amount of dispersant can produce a solid adhesive stick with a smooth surface, high hardness, strong tear resistance, good adhesion, and good cold resistance;

[0086] In Comparative Example 1, no fumed silica was added, only a dispersant was added, and there was no significant effect on the adhesion of the adhesive stick. Without the filling of fumed silica, the hardness of the adhesive was not improved, and the freeze resistance was weak.

[0087] In Comparative Example 2, only fumed silica was added without dispersant, which had a great effect on the dispersion of fumed silica. The fumed silica could not be completely and uniformly dispersed in the interstitial space of the adhesive molecules, resulting in a slight decrease in the hardness of the adhesive and a partial decrease in the freeze resistance.

[0088] In Comparative Example 3, only stearic acid was added as a plasticizer, and the performance of the adhesive stick prepared was barely up to the requirements. However, the hardness of the adhesive was easily affected by pH and the amount of plasticizer added. At the same time, because the plasticizer could not fully fill the interstitial space of the adhesive, the hardness of the adhesive stick was low, and there was a phenomenon of falling off after application. The tear resistance was low, and it was easy to break. At the same time, the freeze resistance decreased significantly. The addition of an excessive amount of luminous material would decrease the hardness of the adhesive and weaken the light transmittance, thereby affecting the luminous effect and performance.

[0089] In Comparative Example 4, an excessive amount of stearic acid plasticizer was added, which resulted in a decrease in the hardness of the adhesive stick instead of an increase. The adhesive stick was softened, and the hardness was too low to affect the adhesion performance.

Claims

1. A fumed silica hardened solid glue stick, characterized by: According to weight components, the raw materials used include the following components 40-70 parts of deionized water; 10-25 parts of adhesive; 0.1-1 part of fumed silica; 1-10 parts of propylene glycol; 1-10 parts of glycerin; 1-10 parts fatty acids; 1-5 parts sodium hydroxide Preservative 0.1-1 part.

2. The fumed silica hardened solid glue stick according to claim 1, characterized in that: The invention also includes 0.1-0.5 parts of a dispersant, which is used to interweave the fumed silica and the stearate formed by fatty acid and sodium hydroxide and then fill the gaps in the colloid.

3. The fumed silica hardened solid glue stick according to claim 2, characterized in that: The dispersant is dispersant ST-83.

4. The fumed silica hardened solid glue stick according to claim 2, characterized in that: The dispersant is used to enhance the surface activity of the fumed silica molecules so that they can work together with the adhesive to enhance the luminescence time of the solid glue stick.

5. The fumed silica hardened solid glue stick according to claim 4, characterized in that: The adhesive is 15-20 parts.

6. The fumed silica hardened solid glue stick according to any one of claims 1 to 5, characterized in that: The fumed silica is hydrophilic fumed silica, and the addition amount is 0.4-0.6 parts.

7. The fumed silica hardened solid glue stick according to any one of claims 1 to 5, characterized in that: The adhesive is selected from polyvinyl pyrrolidone, acrylic resin and polyvinyl alcohol.

8. A fumed silica hardened solid glue stick, characterized in that The following steps are involved: (1) preparing raw materials according to the formula of the fumed silica hardened solid glue stick according to any one of claims 1 to 7; (2) Add deionized water, glycerin, adhesive, and propylene glycol to a reaction kettle at room temperature, stir evenly to obtain a mixed solution, and heat to 82-87° C.; stir at a speed of 300-350 rpm / min for 1-2 hours; (3) Add fumed silica and dispersant while stirring, and stir for 30-60 minutes to completely mix; (4) Add fatty acid while stirring, and after stirring for 1-2 hours, mix well. Control the temperature at 82-87°C, add a prepared sodium hydroxide aqueous solution with a volume concentration of 20-25%, and adjust the pH value of the system to 9-11; (5) Add preservatives while stirring, stir at a constant temperature for 30-60 minutes to mix evenly, then keep the temperature at 82-87°C and let it stand for 3-4 hours to defoam; (6) The degassed solution in the above step (5) is bottled to obtain a silica-hardened solid glue stick.

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