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Analysis and Thinking on the Influence of Different Resins on Adhesive Properties
HC Coatings Raw Materials Network News: Based on the research of epoxy resin, waterborne polyurethane and silicone resin, this paper will analyze the effect of adhesive on the performance of adhesives.
Lin Xiaobo (Henkel Adhesive Co., Ltd. 515065)
Key words: epoxy resin; waterborne polyurethane; silicone resin; adhesive; properties;
Adhesives connect between different materials through interfacial adhesion and cohesion
A natural or synthetic, organic or inorganic substance that is together. The basic component of the adhesive is a bond, and its main components are resins, rubbers, and polymer compounds. In this paper, different resins were used as research objects, and the effects on the properties of adhesives were analyzed by the difference between epoxy resin, waterborne polyurethane and silicone resin. The following is a brief analysis:
I. Study on the effect of epoxy resin on the properties of adhesives
The main component of the epoxy resin adhesive is epoxy resin. From the molecular point of view, the structure of the epoxy resin contains several epoxy rings, which are synthesized by the adhesive, and the self-crossing network structure and curing agent Fully function and change the performance of the adhesive. It is to be understood that the unsaturated group of the epoxy group, due to the electronegativity of the oxygen atom, and taking into account the action of the oxygen atom itself, has a higher electron cloud density and can accept the attack of the electrophilic group [1]. . A single epoxy resin has a low toughness and a weak impact resistance in a cured state, which is difficult to apply. The following is an analysis of the properties of epoxy resins for adhesives:
1. Epoxy resin is one of the main components of the adhesive. It has a great influence on the strength of the adhesive. The following is the analysis of the tensile strength by the tear strength test:
Under the condition that the amount of ingredients is the same, epoxy resin is taken as the research object alone, and the data can be analyzed. With the change of the amount of epoxy resin, the tensile strength is gradually weakened. It can be seen that the change in the amount of epoxy resin will affect the performance of the epoxy resin adhesive.
2. As the amount of epoxy resin changes, the epoxy unsaturation will also change and affect its interaction with the curing agent. The following is a brief analysis:
According to the data analysis, due to the increase in the amount of epoxy resin added, the time of bonding with the curing agent is relatively long, the degree of reaction is low, and the degree of adhesion is low.
3. During the experiment, the effect of the epoxy resin on the performance of the epoxy resin was studied by the change of temperature. As the temperature increases, the toughness and viscosity of the epoxy resin adhesive gradually decrease. At this time, the hydrogen bond between the epoxy resin molecules is broken, and the viscosity will decrease. When the temperature reaches 75 ° C or higher, the adhesive will be Invalid.
Second, the effect of waterborne polyurethane on the performance of adhesives
The waterborne polyurethane adhesive is an adhesive which introduces a hydrophilic group into a main chain or a side chain of a polyurethane molecule and uses water as a dispersing agent. In the actual process, the influence of the polyurethane on the adhesive can be known by the analysis of the polyurethane. The following is a brief analysis:
1. The waterborne polyurethane emulsion is evenly spread in a watch glass and dried at room temperature. The following is the analysis of the amount of polyurethane added and the drying time:
As the polyurethane content increases gradually, the interaction between the carboxyl group and the amino group will gradually increase, the emulsified particle size will gradually increase, and the dispersing ability will be relatively weakened. It can be observed by the laser particle size analyzer, and on the basis of increasing the polyurethane content. The precipitation time is gradually shortened, which proves that as the concentration of polyurethane increases, the effective particle size increases, the hydrophilicity decreases, the drying time is shortened, and the precipitation rate of the adhesive is accelerated, and the precipitation time is relatively shortened.
2. The urethane group of the waterborne polyurethane itself has a great influence on the properties of the polyurethane. Through the action of the carboxyl group and the amino group, the cross-linking force of the molecules will be enhanced, the degree of binding with water molecules will be weakened, and the molecular agglomeration ability will be It will strengthen, water-soluble emulsification will be weakened, and uniformity will be poor, so its adhesion will also be reduced.
3. From a molecular point of view, the interior of the polyurethane contains two or more urethane groups, the structural unit of which is -[-O-CONH-]n-, and by increasing the amount of waterborne polyurethane, we can The color change of the adhesive was observed. The following is a brief analysis:
According to the above data analysis, as the polyurethane content increases, the content of carbamate groups in the molecular chain increases, cross-linking with each other through unsaturated bonds, the interaction between each other is enhanced, the emulsifying ability is relatively weakened, and the emulsified particles are emulsified. When the refractive index is low, the transparency of the adhesive will gradually decrease, and the color change will gradually deepen.
Third, the effect of silicone resin on the performance of adhesives
The organic silicone adhesive can withstand high and low temperature, has good insulation performance, can be combined with the adhesive joint and improve the bonding strength. The following is the analysis of the influence of the silicone resin on the adhesive performance:
1. Through the thermogravimetric measurement, the influence of the silicone resin with different content at the set temperature on the heat resistance of the adhesive can be analyzed. The following is a brief analysis:
Through the above data analysis, its thermal weight loss rate will be reduced because of its many cross-linking points, high cross-linking density and high heat resistance. Therefore, controlling the proper amount of silicone can appropriately increase its heat resistance and enhance its stability.
2. By measuring the effect of different content of silicone resin on the adhesive, we can know that as the amount of silicone resin increases, the network structure inside the adhesive is more complicated, and the connection points between each other increase. The cross-linking force is also enhanced, so that the activity of the silicone resin is enhanced and the viscosity is correspondingly enhanced.
3. Determine the effect of the silicone resin on the conductivity of the adhesive by different amounts of silicone resin. The following is a brief analysis:
According to the above data analysis, on the basis of the same electromotive force, the current passing through it gradually decreases, almost zero, which proves that the conductivity is poor and the insulation performance is strong.
[2] Chen Ping, Liu Shengping, Wang Dezhong. Epoxy resin and its application [M]. Beijing: Chemical Industry Press. 2011: 42.
[3]Zhang Baohua, Ye Jundan, Chen Bin et al. Effect of curing temperature on the properties of epoxy resin cured products [J]. Plastics Industry. 2009, 37 (9): 64-66.
[4]CHEN Jianfu, LI Xiao, ZHANG Weiying, CAI Jinxiang.Study on Synthesis and Modification of Waterborne Polyurethane[J].化工科技.2009,17(1):56-59.
[5]Chen Jianrong, Tian Wenyu, Yang Minli. Overview of Preparation and Development of Waterborne Polyurethane Adhesives[J].Hebei Industrial Science & Technology.2010,27(1):66-68.
Lin Xiaobo (Henkel Adhesive Co., Ltd. 515065)
Key words: epoxy resin; waterborne polyurethane; silicone resin; adhesive; properties;
Adhesives connect between different materials through interfacial adhesion and cohesion
A natural or synthetic, organic or inorganic substance that is together. The basic component of the adhesive is a bond, and its main components are resins, rubbers, and polymer compounds. In this paper, different resins were used as research objects, and the effects on the properties of adhesives were analyzed by the difference between epoxy resin, waterborne polyurethane and silicone resin. The following is a brief analysis:
I. Study on the effect of epoxy resin on the properties of adhesives
The main component of the epoxy resin adhesive is epoxy resin. From the molecular point of view, the structure of the epoxy resin contains several epoxy rings, which are synthesized by the adhesive, and the self-crossing network structure and curing agent Fully function and change the performance of the adhesive. It is to be understood that the unsaturated group of the epoxy group, due to the electronegativity of the oxygen atom, and taking into account the action of the oxygen atom itself, has a higher electron cloud density and can accept the attack of the electrophilic group [1]. . A single epoxy resin has a low toughness and a weak impact resistance in a cured state, which is difficult to apply. The following is an analysis of the properties of epoxy resins for adhesives:
1. Epoxy resin is one of the main components of the adhesive. It has a great influence on the strength of the adhesive. The following is the analysis of the tensile strength by the tear strength test:
Under the condition that the amount of ingredients is the same, epoxy resin is taken as the research object alone, and the data can be analyzed. With the change of the amount of epoxy resin, the tensile strength is gradually weakened. It can be seen that the change in the amount of epoxy resin will affect the performance of the epoxy resin adhesive.
2. As the amount of epoxy resin changes, the epoxy unsaturation will also change and affect its interaction with the curing agent. The following is a brief analysis:
According to the data analysis, due to the increase in the amount of epoxy resin added, the time of bonding with the curing agent is relatively long, the degree of reaction is low, and the degree of adhesion is low.
3. During the experiment, the effect of the epoxy resin on the performance of the epoxy resin was studied by the change of temperature. As the temperature increases, the toughness and viscosity of the epoxy resin adhesive gradually decrease. At this time, the hydrogen bond between the epoxy resin molecules is broken, and the viscosity will decrease. When the temperature reaches 75 ° C or higher, the adhesive will be Invalid.
Second, the effect of waterborne polyurethane on the performance of adhesives
The waterborne polyurethane adhesive is an adhesive which introduces a hydrophilic group into a main chain or a side chain of a polyurethane molecule and uses water as a dispersing agent. In the actual process, the influence of the polyurethane on the adhesive can be known by the analysis of the polyurethane. The following is a brief analysis:
1. The waterborne polyurethane emulsion is evenly spread in a watch glass and dried at room temperature. The following is the analysis of the amount of polyurethane added and the drying time:
As the polyurethane content increases gradually, the interaction between the carboxyl group and the amino group will gradually increase, the emulsified particle size will gradually increase, and the dispersing ability will be relatively weakened. It can be observed by the laser particle size analyzer, and on the basis of increasing the polyurethane content. The precipitation time is gradually shortened, which proves that as the concentration of polyurethane increases, the effective particle size increases, the hydrophilicity decreases, the drying time is shortened, and the precipitation rate of the adhesive is accelerated, and the precipitation time is relatively shortened.
2. The urethane group of the waterborne polyurethane itself has a great influence on the properties of the polyurethane. Through the action of the carboxyl group and the amino group, the cross-linking force of the molecules will be enhanced, the degree of binding with water molecules will be weakened, and the molecular agglomeration ability will be It will strengthen, water-soluble emulsification will be weakened, and uniformity will be poor, so its adhesion will also be reduced.
3. From a molecular point of view, the interior of the polyurethane contains two or more urethane groups, the structural unit of which is -[-O-CONH-]n-, and by increasing the amount of waterborne polyurethane, we can The color change of the adhesive was observed. The following is a brief analysis:
According to the above data analysis, as the polyurethane content increases, the content of carbamate groups in the molecular chain increases, cross-linking with each other through unsaturated bonds, the interaction between each other is enhanced, the emulsifying ability is relatively weakened, and the emulsified particles are emulsified. When the refractive index is low, the transparency of the adhesive will gradually decrease, and the color change will gradually deepen.
Third, the effect of silicone resin on the performance of adhesives
The organic silicone adhesive can withstand high and low temperature, has good insulation performance, can be combined with the adhesive joint and improve the bonding strength. The following is the analysis of the influence of the silicone resin on the adhesive performance:
1. Through the thermogravimetric measurement, the influence of the silicone resin with different content at the set temperature on the heat resistance of the adhesive can be analyzed. The following is a brief analysis:
Through the above data analysis, its thermal weight loss rate will be reduced because of its many cross-linking points, high cross-linking density and high heat resistance. Therefore, controlling the proper amount of silicone can appropriately increase its heat resistance and enhance its stability.
2. By measuring the effect of different content of silicone resin on the adhesive, we can know that as the amount of silicone resin increases, the network structure inside the adhesive is more complicated, and the connection points between each other increase. The cross-linking force is also enhanced, so that the activity of the silicone resin is enhanced and the viscosity is correspondingly enhanced.
3. Determine the effect of the silicone resin on the conductivity of the adhesive by different amounts of silicone resin. The following is a brief analysis:
According to the above data analysis, on the basis of the same electromotive force, the current passing through it gradually decreases, almost zero, which proves that the conductivity is poor and the insulation performance is strong.
references:
[2] Chen Ping, Liu Shengping, Wang Dezhong. Epoxy resin and its application [M]. Beijing: Chemical Industry Press. 2011: 42.
[3]Zhang Baohua, Ye Jundan, Chen Bin et al. Effect of curing temperature on the properties of epoxy resin cured products [J]. Plastics Industry. 2009, 37 (9): 64-66.
[4]CHEN Jianfu, LI Xiao, ZHANG Weiying, CAI Jinxiang.Study on Synthesis and Modification of Waterborne Polyurethane[J].化工科技.2009,17(1):56-59.
[5]Chen Jianrong, Tian Wenyu, Yang Minli. Overview of Preparation and Development of Waterborne Polyurethane Adhesives[J].Hebei Industrial Science & Technology.2010,27(1):66-68.