Epoxy adhesive and preparation method thereof

Abstract

The invention relates to the technical field of adhesives, and provides an epoxy adhesive and a preparation method thereof. The epoxy adhesive is matched with a liquid adhesive to form a filler of a solid component C, so as to further improve the adhesion effect of the liquid adhesive. In a storage state, components A, B and C are independent of each other. When used, the components A, B and C are integrated with each other, so that the operation is simpler and more practical. The epoxy adhesive comprises components A, B and C. Component C is modified cellulose, and the modified cellulose comprises a cellulose skeleton and a modified group. The cellulose skeleton is a linear polymer compound formed by connecting glucose molecules through β-1,4-glycosidic bonds. The modified group is a methyl and carboxymethyl group introduced through an etherification reaction. Component A is a mixture of epoxy resin, a toughening agent, a diluent, white carbon black and a coupling agent. Component B is a mixture of epoxy resin, an aromatic polyamine, an aliphatic polyamine, a polyether amine, a polyamide, a polythiol, a accelerator, a coupling agent and white carbon black.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and in particular to an epoxy adhesive and a preparation method thereof. Background Art

[0002] As is known to all, epoxy adhesive is a curing system prepared by polyurethane prepolymer modified epoxy resin (component A) and homemade curing agent (component B) in a ratio of 10:1 to 1:1 (weight ratio), which is resistant to high temperature, has good toughness and high reaction activity. In order to further improve the bonding properties of epoxy adhesive and facilitate the preparation of epoxy adhesive, we propose an epoxy adhesive and a preparation method thereof.

[0003] After searching, the invention patent with Chinese patent announcement number CN111019580A discloses an epoxy resin adhesive and its preparation method and application. It is roughly described as follows: the epoxy resin adhesive includes component A and component B. The raw materials for preparing component A include the following components: epoxy resin, toughening agent, diluent, white carbon black and coupling agent. The raw materials for preparing component B include the following components: epoxy resin, aromatic polyamine, aliphatic polyamine, polyether amine, polyamide, polythiol, accelerator, coupling agent and white carbon black. When using, the epoxy resin, toughening agent and diluent in component A are mixed together to form a mortar. , white carbon black, a coupling agent, optionally a thermal conductive powder and optionally a flame retardant are mixed to obtain component A; part of the epoxy resin and the aromatic polyamine in component B are mixed and reacted to obtain a modified curing agent C; the remaining epoxy resin, aliphatic polyamine, polyether amine and polyamide in component B are mixed and reacted to obtain a modified curing agent D; the modified curing agent C obtained in step 2) is mixed with the modified curing agent D obtained in step 3) to obtain a modified curing agent; the polythiol in component B, optionally a thermal conductive powder, a accelerator, a coupling agent, white carbon black and the modified curing agent obtained in step 4) are mixed to obtain component B.

[0004] Although the above-mentioned prior art solution forms an epoxy resin adhesive and forms a preparation method with the epoxy resin adhesive, the main body of the adhesive is liquid, and the corresponding bonding form formed when used is filling and solidifying relative to the object to be bonded. Therefore, the structural strength needs to be further improved and the practicality needs to be further enhanced. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the present invention provides an epoxy adhesive and a preparation method thereof, wherein a matching liquid adhesive forms a filler for a solid component C, further improving the adhesion effect of the liquid adhesive, and components A, B and C are independent of each other in the storage state, and when in use, the operation of fusing components A, B and C with each other is relatively simple and more practical.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an epoxy adhesive, comprising component A and component B, and also comprising component C, wherein component C is modified cellulose, wherein the modified cellulose comprises a cellulose skeleton and a modified group, wherein the cellulose skeleton is a linear polymer compound formed by glucose molecules connected by β-1,4-glycosidic bonds, wherein the modified group is a methyl and carboxymethyl group introduced by an etherification reaction, wherein component A is a mixture of an epoxy resin, a toughening agent, a diluent, white carbon black and a coupling agent, and wherein component B is a mixture of an epoxy resin, an aromatic polyamine, an aliphatic polyamine, a polyether amine, a polyamide, a polythiol, a accelerator, a coupling agent and white carbon black.

[0009] Preferably, the etherification reaction principle of the modified cellulose is:

[0010] Cellulose + NaOH → alkali cellulose

[0011] Alkali cellulose + ClCH2COOH → modified cellulose + NaCl

[0012] The reaction conditions are 50° C.-70° C., the reaction environment is a mixed solvent of an organic solvent and water, and the reaction time is generally several hours to more than ten hours.

[0013] An epoxy adhesive carrier box comprises a container structure, wherein the container structure comprises a storage shell, wherein the storage shell is provided with a storage cavity A, a storage cavity B and an open bin, wherein the storage shell is provided with two tank material tubes, wherein the two tank material tubes are respectively connected with the storage cavity A and the storage cavity B, wherein both tank material tubes are made of materials that can be sealed by heat melt, wherein the storage cavity A and the storage cavity B are respectively used for storing component A and component B, wherein a connecting port is provided between the storage cavity A and the storage cavity B in the storage shell, wherein a separation film is provided at the connecting port, wherein modified cellulose is provided in the open bin, wherein the modified cellulose is a strip-shaped fixed structure, wherein a hot melt sealing cover is provided at the opening of the open bin, wherein a brittle weakened section is provided on the storage shell, wherein an auxiliary push structure matching the modified cellulose is provided on the storage shell.

[0014] Furthermore, the auxiliary push structure includes an extrusion push strip, a guide sleeve is arranged outside the extrusion push strip, the guide sleeve is fixedly connected to the storage shell, a break area matching the extrusion push strip is arranged on the storage shell, the extrusion push strip is equipped with a counter-push assembly, and the counter-push assembly is connected to the storage shell.

[0015] Furthermore, the push assembly includes two push plates and two linkage plates, and the two linkage plates are respectively connected to the two push plates, the two push plates and the storage shell, and the two linkage plates and the extrusion push strips through softened connecting strips.

[0016] Furthermore, the extrusion push strip is provided with a notched tooth ring, the breach zone is provided with a sealing layer, and the notched tooth ring is used for extrusion cutting of the sealing layer.

[0017] Furthermore, a closed thin connecting strip is connected between the extrusion push strip and the guide sleeve.

[0018] Furthermore, the storage shell is made of a transparent material as a whole.

[0019] A method for preparing an epoxy adhesive comprises the following steps:

[0020] S1. First, component A is prepared by weighing and mixing epoxy resin, toughening agent, diluent, white carbon black and coupling agent, component B is prepared by weighing and mixing epoxy resin, aromatic polyamine, aliphatic polyamine, polyetheramine, polyamide, polythiol, accelerator, coupling agent and white carbon black, and component C is prepared by manufacturing modified limiter through etherification reaction principle, thereby forming component A, component B and component C are prepared separately;

[0021] S2. After preparation, component A and component B are in liquid state, and composition C is in a strip-shaped solid structure. Component A and component B are respectively filled into storage cavity A and storage cavity B through two tank material tubes. After filling, hot-melt seals are formed on the two tank material tubes, so that component A and component B cannot be discharged after entering storage cavity A and storage cavity B respectively. Component A and component B are in an unsaturated state relative to the filling state of storage cavity A and storage cavity B respectively. Finally, composition C is inserted into the open bin, and the opening of the open bin is sealed by heating the hot-melt sealing cover;

[0022] S3. When in use, firstly, the storage chamber B is squeezed relative to the storage chamber A, so that the pressure of the storage chamber B is increased to increase the pressure of the internal space, so that the component B in the storage chamber B has a tendency to move into the storage chamber A through the connecting port, and the storage chamber B is squeezed continuously until the separation film at the connecting port is broken, so that the storage chamber B and the storage chamber A are connected to each other, and then the storage chamber B and the storage chamber A are squeezed alternately and repeatedly, so that the components A and B are mixed with each other;

[0023] S4, after component A and component B are mixed with each other, the relative position of the storage shell is adjusted relative to the bonding position of the object to be bonded, so that the brittle weakened section on the storage shell is aligned with the position to be bonded of the object. After the alignment is completed, the guide sleeve on the storage shell is used as a fulcrum, and the two ends of the storage shell are pushed in the opposite direction of the fulcrum to achieve the breaking of the storage shell. Due to the setting of the brittle weakened section on the storage shell, the brittle weakened section is the fracture position. After the fracture, the mixture of component A and component B will flow out, and the storage shell is continued to be bent until the opening bin is also broken, and the composition C is folded in half and enters the fracture of the storage shell;

[0024] S5. Component C is pushed out from the open bin by the auxiliary pushing structure to achieve the integration of component C into the mixture of component A and component B, and the mixture of component A and component B is continuously applied relative to the bonding position of the object so that the mixture of component A and component B covers and covers component C.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the present invention provides an epoxy adhesive and a preparation method thereof, which have the following beneficial effects:

[0027] 1. In the present invention, by adding component C, the solid component is supplemented to the liquid structure formed by the combination of component A and component B, thereby improving the structural strength of the liquid mixture of component A and component B after condensation and improving the bonding effect.

[0028] 2. In the present invention, through the design of the container structure, the matching components A, B and C form a corresponding storage structure, which is convenient for storing components A, B and C separately and makes the integration of components A, B and C during use simpler and more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the preparation process of the present invention;

[0030] Figure 2 It is a schematic diagram of the three-dimensional structure of the epoxy adhesive carrier box of the present invention;

[0031] Figure 3 It is a schematic diagram of a three-dimensional structure of a partial cross-section of an epoxy adhesive carrier box of the present invention;

[0032] Figure 4 For the present invention Figure 3 A schematic diagram of the local enlarged structure at point A in the middle;

[0033] Figure 5 It is a schematic diagram of the three-dimensional structure of the epoxy adhesive carrier box of the present invention when viewed from above;

[0034] Figure 6 It is a schematic diagram of the three-dimensional structure of the epoxy adhesive carrier box of the present invention after being folded in half.

[0035] In the figure: 1. storage shell; 2. storage cavity A; 3. storage cavity B; 4. opening bin; 5. tank material pipe; 6. connecting port; 7. separation film; 8. brittle weakened section; 9. hot melt sealing cover; 10. extrusion push strip; 11. guide sleeve; 12. rupture area; 13. push plate; 14. linkage plate; 15. softening connecting strip; 16. notched gear ring; 17. sealing layer; 18. sealing thin connecting strip. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example

[0038] See also Figure 1 -Attached Figure 6 , an epoxy adhesive, comprising component A and component B, and also comprising component C, wherein component C is modified cellulose, the modified cellulose comprises a cellulose skeleton and a modified group, the cellulose skeleton is a linear polymer compound formed by glucose molecules connected by β-1,4-glycosidic bonds, the modified group is a methyl and carboxymethyl group introduced by an etherification reaction, component A is a mixture of epoxy resin, a toughening agent, a diluent, white carbon black and a coupling agent, and component B is a mixture of epoxy resin, aromatic polyamine, aliphatic polyamine, polyether amine, polyamide, polythiol, a accelerator, a coupling agent and white carbon black.

[0039] The etherification reaction principle of modified cellulose is:

[0040] Cellulose + NaOH → alkali cellulose

[0041] Alkali cellulose + ClCH2COOH → modified cellulose + NaCl

[0042] The reaction conditions are 50℃-70℃, the reaction environment is a mixed solvent of organic solvent and water, and the reaction time is generally several hours to more than ten hours. By adding component C, the solid component is added to the liquid structure formed by the combination of component A and component B, which improves the structural strength of the liquid mixture of component A and component B after condensation and improves the bonding effect.

[0043] It should be further explained that an epoxy adhesive carrier box includes a container structure, the container structure includes a storage shell 1, the storage shell 1 is provided with a storage cavity A2, a storage cavity B3 and an open bin 4, the storage shell 1 is provided with two tank material pipes 5, the two tank material pipes 5 are respectively connected to the storage cavity A2 and the storage cavity B3, the two tank material pipes 5 are both made of materials that can be hot-melt sealed, the storage cavity A2 and the storage cavity B3 are respectively used for storing component A and storing component B, and the storage shell 1 is located in the storage cavity A2 and the storage cavity B3. A connecting port 6 is provided between the storage cavities B3, a separating film 7 is provided at the connecting port 6, modified cellulose is provided in the opening bin 4, the modified cellulose is a strip-shaped fixed structure, a hot-melt sealing cover 9 is provided at the opening of the opening bin 4, a brittle weakened section 8 is provided on the storage shell 1, an auxiliary push structure matching the modified cellulose is provided on the storage shell 1, the auxiliary push structure includes an extrusion push strip 10, a guide sleeve 11 is provided outside the extrusion push strip 10, the guide sleeve 11 is fixedly connected to the storage shell 1, and a storage shell 1 is provided There is a rupture area 12 matching the extrusion push strip 10, the extrusion push strip 10 is equipped with a push assembly, the push assembly is connected to the storage shell 1, the push assembly includes two push plates 13 and two linkage plates 14, the two linkage plates 14 are respectively connected to the two push plates 13, the two push plates 13 and the storage shell 1, and the two linkage plates 14 and the extrusion push strip 10 through a softened connecting strip 15, the extrusion push strip 10 is provided with a cut tooth ring 16, the rupture area 12 is provided with a sealing layer 17, the cut tooth ring 16 and the extrusion cut for the sealing layer 17, a closed thin connecting strip 18 is connected between the extrusion push strip 10 and the guide sleeve 11, through the design of the container structure, the matching components A, B and C form corresponding storage structures, which is convenient for storing components A, B and C separately, and the operation of integrating components A, B and C during use is relatively simple and more practical, and the storage shell 1 is made of a transparent material as a whole, which is convenient for observing the interior of the storage shell 1.

[0044] In summary, the preparation and use method of the epoxy adhesive is as follows: when in use, first, component A is prepared by weighing and mixing epoxy resin, toughening agent, diluent, white carbon black and coupling agent, component B is prepared by weighing and mixing epoxy resin, aromatic polyamine, aliphatic polyamine, polyetheramine, polyamide, polythiol, accelerator, coupling agent and white carbon black, and modified limiter is manufactured by etherification reaction principle to prepare component C, so as to prepare component A, component B and component C separately. After component A and component B are prepared, The components A and B are respectively filled into the storage chamber A2 and the storage chamber B3 through two tank material tubes 5. After the filling is completed, the two tank material tubes 5 are formed into hot-melt seals, so that the components A and B respectively enter the storage chamber A2 and the storage chamber B3 and cannot be discharged. The filling states of the components A and B are respectively in an unsaturated state relative to the storage chamber A2 and the storage chamber B3. Finally, the composition C is inserted into the open chamber 4, and the opening of the open chamber 4 is sealed by heating the hot-melt sealing cover 9. When used, First, the storage chamber B3 is squeezed relative to the storage chamber A2, so that the storage chamber B3 is pressurized to increase the pressure of the internal space so that the component B in the storage chamber B3 has a tendency to move into the storage chamber A2 through the connecting port 6, and the storage chamber B3 is squeezed until the separation film 7 at the connecting port 6 is broken, so that the storage chamber B3 and the storage chamber A2 are connected to each other, and then the storage chamber B3 and the storage chamber A2 are squeezed alternately and repeatedly to make the components A and B mixed with each other. After the components A and B are mixed with each other, relative to the components that need to be bonded The relative position of the storage shell 1 is adjusted according to the bonding position of the object to be operated, so that the brittle weakened section 8 on the storage shell 1 is aligned with the position to be bonded of the object. After the alignment is completed, the guide sleeve 11 on the storage shell 1 is used as a fulcrum to push the two ends of the storage shell 1 in the opposite direction of the fulcrum to achieve the breaking of the storage shell 1. Due to the setting of the brittle weakened section 8 on the storage shell 1, the brittle weakened section 8 is the breaking position. After the breaking, the mixture of component A and component B will flow out. The storage shell 1 is continued to be bent until the opening bin 4 is also broken, and the composition C is folded in half and enters the fracture of the storage shell 1.

[0045] Furthermore, component C is pushed out from the open bin 4 by the auxiliary pushing structure. Since a part of component A and component B flows out and is smeared on the bonding position of the object at the initial stage of the brittle weakened section 8 rupture, component C will be integrated into the mixture of component A and component B that has flowed out from the storage shell 1 after being pushed out. After component C is completely pushed out, the mixture of component A and component B continues to be smeared relative to the bonding position of the object, so that the mixture of component A and component B forms a coating and covering on component C, as shown in the attached Figure 6As shown in FIG. 1 , it is a schematic diagram of the storage shell 1 after being broken. Due to the linkage effect of the push plate 13, the linkage plate 14 and the softening connecting strip 15, the push plate 13, the linkage plate 14 and the softening connecting strip 15 will also enter the adjacent Figure 6 In the state shown, in this state, it is only necessary to press down the push plate 13, and the transmission of the linkage plate 14 can form the push of the extrusion push strip 10 relative to the guide sleeve 11. When the closed thin link 18 is pushed by the force to form an impact fracture, the relative position of the extrusion push strip 10 relative to the guide sleeve 11 can be pushed. The cut gear ring 16 contacts the closed layer 17 and forms a relative extrusion effect to achieve the cutting of the rupture area 12. After that, the extrusion push strip 10 can push the component C, thereby pushing out the component C. Obviously, the body structure of this product is a disposable product. Therefore, in order to reduce the production cost, it is a structure formed by integral injection molding and welding. In the actual promotion state, the storage chamber A2 and the storage chamber B will be set according to the specific usage. 3, and the size of component C is limited so that the epoxy adhesive is suitable for most actual situations. For larger bonding places, multiple epoxy adhesive carrier boxes can be selected for matching use according to actual needs. The position of the bonding place is comprehensively considered, and priority is given to adjusting the bonding position of the bonding material to be bonded upward, so that it is convenient for components A and B to form self-flow under the action of their own gravity. At the same time, the left and right ends of the storage shell 1 are designed to be extrudable and deformable. When the self-weight of components A and B cannot be used to form self-flow, the mixture of components A and B can be extruded by squeezing the storage shell 1, so as to be suitable for bonding operations of materials at various angles.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An epoxy adhesive carrier box, characterized in that: The container structure comprises a storage shell (1), wherein the storage shell (1) is provided with a storage cavity A (2), a storage cavity B (3) and an open bin (4), and the storage shell (1) is provided with two tank material pipes (5), wherein the two tank material pipes (5) are respectively connected to the storage cavity A (2) and the storage cavity B (3), and the two tank material pipes (5) are both made of a material that can be hot-melt sealed, and the storage cavity A (2) and the storage cavity B (3) are respectively used for storing component A and storing component B. The storage shell (1) is provided with a connecting port (6) between the storage chamber A (2) and the storage chamber B (3), and a separation film (7) is provided at the connecting port (6). The opening chamber (4) is provided with modified cellulose, and the modified cellulose is a strip-shaped fixed structure. A hot-melt sealing cover (9) is provided at the opening of the opening chamber (4). The storage shell (1) is provided with a brittle weakened section (8), and the storage shell (1) is provided with an auxiliary push structure matching the modified cellulose. The auxiliary push structure comprises an extrusion push strip (10), a guide sleeve (11) is arranged outside the extrusion push strip (10), the guide sleeve (11) is fixedly connected to the storage shell (1), a break area (12) matching the extrusion push strip (10) is arranged on the storage shell (1), the extrusion push strip (10) is equipped with a push assembly, the push assembly is connected to the storage shell (1), and the push assembly comprises two push plates (13) and two linkage plates (14). ), the two linkage plates (14) are respectively connected to the two push plates (13), the two push plates (13) are respectively connected to the storage shell (1), and the two linkage plates (14) are respectively connected to the extrusion push strip (10) via a softened connection strip (15); the extrusion push strip (10) is provided with a notched tooth ring (16), the breach area (12) is provided with a sealing layer (17), and the notched tooth ring (16) is used for extrusion breaching of the sealing layer (17).

2. The epoxy adhesive carrier box according to claim 1, characterized in that: A closed thin connecting strip (18) is connected between the extrusion push strip (10) and the guide sleeve (11).

3. The epoxy adhesive carrier box according to claim 2, characterized in that: The storage shell (1) is made of a transparent material as a whole.

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