CN114231202A

CN114231202A - Sponge adhesive tape and preparation method thereof

Info

Publication number: CN114231202A
Application number: CN202111601337.4A
Authority: CN
Inventors: 秦伟军; 王爱平
Original assignee: Changzhou Fengjin Plastic Technology Co ltd
Current assignee: Changzhou Fengjin Plastic Technology Co ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-03-25
Anticipated expiration: 2041-12-24
Also published as: CN114231202B

Abstract

The application relates to the field of adhesive tapes, and particularly discloses a sponge adhesive tape and a preparation method thereof. The sponge adhesive tape comprises a release paper layer, a bonding layer, a foam layer and a waterproof layer which are sequentially arranged, wherein the foam layer is made of foam materials, and the foam materials comprise the following substances in parts by weight: 50-60 parts of EVA (ethylene-vinyl acetate), 10-20 parts of rubber, 3-5 parts of foaming agent and 0.3-1 part of cross-linking agent, wherein the waterproof layer comprises a waterproof agent which comprises the following substances in parts by weight: 20-30 parts of EVA emulsion and 5-10 parts of nano silicon dioxide; the preparation method comprises the steps of S1, preparing a foam layer; s2, preparing adhesive tapes. The sponge adhesive tape can be used in the fields of automobile decoration, shock resistance and the like, and has the advantages of better waterproof performance and bonding performance.

Description

Sponge adhesive tape and preparation method thereof

Technical Field

The application relates to the field of adhesive tapes, in particular to a sponge adhesive tape and a preparation method thereof.

Background

The sponge adhesive tape is made up by using EVA foam as base material, coating solvent (or hot-melt type) pressure-sensitive adhesive on one side or two sides of said base material and mounting the easily-stripped isolating paper. The sponge adhesive tape has better viscosity and better effect on bonding rough surface articles and fixing light and small materials, so the sponge adhesive tape can be widely applied to the fields of automobile decoration, shock resistance, heat insulation, article suspension, insulation and heat preservation of electrical refrigeration engineering and the like for fixation and bonding.

Sponge sticky tape is when using, during steam in the air and external water are easier to permeate the sponge sticky tape, because the porous structure of sponge sticky tape, make sponge sticky tape's hydroscopicity higher, the intensity of the sponge sticky tape of adsorbed water reduces, and then sponge sticky tape's cohesive strength is not good, in order to improve sponge sticky tape's waterproof nature, it has waterproof coating to adopt to coat outside sponge sticky tape usually, through with separation such as steam outside waterproof layer, improve sponge sticky tape's water-proof effects, improve sponge sticky tape's bonding effect.

In view of the above related art, the inventor believes that the waterproof coating is simply coated on the sponge tape, and due to the porous structure of the sponge tape, the coating effect of the waterproof coating on the sponge tape is poor, that is, water vapor can still permeate into the sponge tape, so that the sponge tape has the defect of poor waterproof property, and further the cohesiveness of the sponge tape is poor.

Disclosure of Invention

In order to improve the defect that the waterproof performance of the sponge adhesive tape is poor, the application provides the sponge adhesive tape and the preparation method thereof.

In a first aspect, the application provides a sponge adhesive tape, which adopts the following technical scheme:

the sponge adhesive tape comprises a release paper layer, a bonding layer, a foam layer and a waterproof layer which are sequentially arranged, wherein the foam layer is made of foam materials, and the foam materials comprise the following substances in parts by weight: 50-60 parts of EVA (ethylene-vinyl acetate), 10-20 parts of rubber, 3-5 parts of foaming agent and 0.3-1 part of cross-linking agent, wherein the waterproof layer is prepared by coating waterproof agents, and the waterproof agents comprise the following substances in parts by weight: 20-30 parts of EVA emulsion and 5-10 parts of nano silicon dioxide.

By adopting the technical scheme, as the foaming agent and the cross-linking agent are used together, the EVA and the rubber can be cross-linked, and then the foam material forms a uniform closed cell structure under the catalysis of the foaming agent. The foaming is carried out simultaneously in the cross-linking process of the foam material, the combination performance of all components in the foam material is improved under the cross-linking of the cross-linking agent, the strength of the foam material is improved, and then the foam holes generated by the foaming agent are not easy to combine or break; simultaneously, at the in-process of cross-linking, increase the dispersion effect of foamer in the cotton material of bubble, and then stably form even and fine and close obturator structure, improve the support intensity and the leakproofness on the cotton layer of bubble, reduce the possibility that steam gets into the cotton of bubble through the hole of the cotton intercommunication of bubble, improve the water-proof effects of sponge sticky tape.

Secondly, the nano silicon dioxide and the EVA emulsion are used as waterproof agents, after the waterproof agents are coated on the foam layer, the combination performance between the waterproof layer and the foam layer is better through the compatibility between the EVA emulsion and the EVA, meanwhile, the nano silicon dioxide can form a rough surface structure on the surface of the waterproof layer, namely a lotus-like surface structure, and the surface hydrophobicity of the waterproof layer is effectively improved.

In addition, after the waterproof agent is coated outside the foam layer, the nano silicon dioxide in the waterproof agent can be partially filled in the open pore part outside the foam layer, so that on one hand, the combination effect between the waterproof layer and the foam layer is further enhanced; on the other hand, further block the possibility that steam got into the cotton layer of bubble, stably improved the water-proof effects of sponge sticky tape, strengthened the bonding effect of sponge sticky tape.

Preferably, the foam material further comprises thermal expansion microcapsules, wherein the thermal expansion microcapsules are modified thermal expansion microcapsules modified by a modifier, and the modifier comprises hydrotalcite.

By adopting the technical scheme, the thermal expansion microcapsules are added into the foam material, on one hand, the thermal expansion microcapsules can be used as an auxiliary foaming agent, and in the heating foaming process, the shells of the thermal expansion microcapsules are heated to expand to prop open the foam material, so as to assist the formation of foam holes and support the foam holes, so that the compactness of the pores in the foam layer is increased, and the possibility of the breakage and merging of the foam holes can be reduced; on the other hand, after the foam layer is formed, the thermal expansion microcapsules can be shrunk again, foam holes can be filled all the time, and water vapor is blocked to a certain extent.

Secondly, hydrotalcite is adopted to modify the thermal expansion microcapsules, so that the thermal expansion of the thermal expansion microcapsules is inhibited to a certain extent, the size of the foam holes is reduced, the regularity of the foam holes is improved, the possibility of foam merging and breaking is reduced, the compactness of the holes in the foam layer is further enhanced, the possibility of water vapor permeating into the foam layer is reduced, the supporting strength of the foam layer is enhanced, and the waterproofness and the cohesiveness of the sponge tape are improved.

Preferably, the modifier further comprises polymethylhydrosiloxane and silane coupling agent, and the mass ratio of the hydrotalcite to the polymethylhydrosiloxane to the silane coupling agent is 1:1-2: 4-6.

By adopting the technical scheme, as the hydrotalcite has a layered structure, other components in the modifier are easier to load on the hydrotalcite, the polymethylhydrosiloxane generates a hybridization reaction on the surface of the hydrotalcite, hydroxide ions on the surface of the hydrotalcite are consumed, and alkyl groups are added to form a rough surface structure, and after the hydrotalcite is coated with the silane coupling agent, the surface of the modifier forms a secondary rough structure similar to the surface of lotus leaves, so that the surface energy of the hydrotalcite is reduced, the hydrophobic property of the thermal expansion microcapsule is improved, water vapor is further blocked, and the waterproof property of the foam layer is improved.

Meanwhile, the hydrotalcite keeps a two-dimensional layered structure all the time, so that the thermal expansion microcapsules can be stably crosslinked with the foam material to stably form a compact foam structure, and water vapor is prevented from entering the foam layer.

Preferably, the waterproof agent further comprises chopped polypropylene fibers and trimethoxy silane, and the mass ratio of the EVA emulsion to the nano-silica to the chopped polypropylene fibers to the trimethoxy silane is 20-30:5-10:3-5: 6-8.

By adopting the technical scheme, the polypropylene fiber is added into the waterproof agent, and the polypropylene fiber can form a tangled structure, so that the components in the waterproof agent are stably pulled, and the bonding effect between the waterproof layer and the foam layer is enhanced. The trimethoxy silane can be used for carrying out surface modification on the nano silicon dioxide, so that the hydrophobic property of the surface of the nano silicon dioxide is increased, and meanwhile, due to the good bonding property between the trimethoxy silane and the EVA, on one hand, the bonding effect between the components in the waterproof agent can be further enhanced, namely, the waterproof agent can be stabilized on the surface of the foam layer to form a waterproof layer, cracks are not easy to appear in the waterproof layer, and the waterproof effect is stably achieved; on the other hand, the combination effect between waterproof layer and the foam layer is strengthened, and the waterproof effect of the sponge adhesive tape is improved in a synergistic manner.

Preferably, the preparation of the nano-silica comprises the following steps: respectively weighing the following substances in parts by weight: 0.5-1.5 parts of hexadecyl trimethyl ammonium bromide, 1-1.5 parts of urea, 3-6 parts of ethyl orthosilicate, 4-8 parts of n-amyl alcohol, 100 parts of cyclohexane and 100 parts of hexadecyl trimethyl ammonium bromide, urea and water are stirred and mixed to prepare a mixed solution, the ethyl orthosilicate, the n-amyl alcohol and the cyclohexane are added into the mixed solution, the mixed solution is stirred and mixed, the mixed solution is condensed and refluxed, precipitates are centrifugally reserved, and the nano silicon dioxide is prepared by washing and drying.

By adopting the technical scheme, the nano silicon dioxide is prepared by adopting a sol-gel method and heat treatment, so that the microstructure of the nano silicon dioxide is in a flower shape, and compared with spherical nano silicon dioxide, the roughness of the surface of the waterproof agent is further increased, and the waterproof effect of the waterproof layer is improved.

Preferably, the nano-silica is subjected to dispersion treatment by a dispersant, and the dispersant comprises any one of polyether sulfone, pentaerythritol stearate and quaternary ammonium salt.

By adopting the technical scheme, firstly, polyether sulfone is adopted to modify the nano silicon dioxide, so that on one hand, the wettability of the surface of the nano silicon dioxide is improved, and the dispersion effect of the nano silicon dioxide in the waterproof agent is enhanced; on the other hand, the polyether sulfone can promote the waterproof agent to form a waterproof layer on the surface of the foam layer, so that the film forming effect of the waterproof agent is improved, and the foam layer is stably protected.

And secondly, pentaerythritol stearate can form a coating layer on the surface of the nano silicon dioxide, so that the lubricity of the nano silicon dioxide is increased, the possibility of self-agglomeration of the nano silicon dioxide is reduced, the dispersion effect of the nano silicon dioxide in the waterproof agent is improved, and further, after the waterproof agent is coated on the foam layer, the roughness of the surface of the foam layer can be uniformly improved by the nano silicon dioxide, and the waterproof effect of the foam layer is stably improved.

In addition, the quaternary ammonium salt is adopted to modify the nano silicon dioxide, so that the surface activity of the nano silicon dioxide is improved, namely the hydrophilicity of the nano silicon dioxide is enhanced, the dispersing effect of the nano silicon dioxide in the waterproof agent is better, and the waterproof agent can stably form a rough waterproof structure on the surface of the foam layer.

Preferably, the foaming agent comprises a foaming agent DDL, a foaming agent AC and a foaming agent H, and the mass ratio of the foaming agent DDL to the foaming agent AC to the foaming agent H is 5-15:80-90: 1-5.

By adopting the technical scheme, the foaming agent DDL, the foaming agent AC and the foaming agent H are adopted and used for foaming the foam material, the foaming agent DDL can be decomposed at a low temperature for foaming, the foam material is pre-foamed, a pre-reaming effect is achieved, in the temperature rising process, the foaming agent AC promotes the foam material to be stably foamed, and the uniform and compact foam holes are formed due to the good dispersion effect of the foaming agent AC in the foam material. Under the promotion of the foaming agent H, the decomposition rate of the foaming agent AC is improved, and the foaming effect is improved. Simultaneously, because the synergism between foamer and the cross-linking agent, the cell that the prefoaming produced is fixed by crosslinked network, and then the tiny bubble of follow-up production, on the one hand, big bubble can the tiny bubble form certain grade of land and join in marriage the effect, improves the elasticity on bubble cotton layer, and on the other hand, can form comparatively smooth bubble cotton layer surface, reduces the possibility that water adheres to bubble cotton layer.

Preferably, the rubber comprises at least one of butyl rubber, ethylene propylene diene monomer rubber and polyurethane.

By adopting the technical scheme, the butyl rubber and the EVA are matched with each other firstly, and the butyl rubber has higher density, and is added into the EVA in a small amount to adjust the overall density of the foam cotton material, so that the crosslinking density of the foam cotton material is improved under the induction crosslinking of the crosslinking agent, a compact and regular closed cell structure can be formed under the foaming of the foaming agent, and the waterproof effect of the foam cotton material is improved.

Secondly, ethylene propylene diene monomer rubber and EVA are matched with each other, and a blend with mutually compatible amorphous regions is formed in a molten state, so that the forming effect of closed pores in the foam is improved.

Meanwhile, the polyurethane and the EVA are matched with each other, so that the elasticity of the EVA is increased, the viscoelasticity among all components of the foam cotton material is improved, and the elasticity and the sealing performance of the foam cotton layer are stably improved.

In addition, the butyl rubber, the ethylene propylene diene monomer, the polyurethane and the EVA are matched, so that the compatibility between the EVA and the rubber and the crosslinking effect in the foam material are improved, an even and compact foam structure is formed, and the water blocking effect of the foam layer is stably improved.

In a second aspect, the application provides a preparation method of a sponge adhesive tape, which adopts the following technical scheme:

a preparation method of a sponge adhesive tape comprises the following steps: s1, preparing a foam layer: mixing the foam materials, plasticating, thinly passing to obtain rubber compound, remilling out a sheet, foaming at the foaming temperature of 120-200 ℃ to obtain a foam layer; s2, preparing an adhesive tape: soaking the foam layer in a waterproof agent, standing to obtain the foam layer coated with a waterproof layer, namely a primary product, coating a bonding layer on one side of the primary product and covering a release paper layer to obtain the foam adhesive tape.

Through adopting above-mentioned technical scheme, with the cotton layer flooding of bubble in waterproofing agent for the cotton outer even cladding of bubble has the waterproof layer, and isolated steam gets into the cotton layer of bubble, improves the water-proof effects on the cotton layer of bubble, and gives the cotton layer of bubble comparatively crude surface structure, strengthens the combination effect between the cotton layer of bubble and the tie coat. Meanwhile, at a proper foaming temperature, the foaming effect and the decomposition speed of the foaming agent are proper, and a stable closed-cell structure is formed, so that the sponge adhesive tape obtains excellent waterproof and bonding effects.

In summary, the present application has the following beneficial effects:

1. because the foaming agent and the crosslinking agent are used together, the foaming agent and the crosslinking agent can promote the crosslinking between the EVA and the rubber, thereby improving the crosslinking density between foam cotton materials, limiting the size of foam pores, being beneficial to forming a compact and uniform closed pore structure and improving the waterproof performance of a foam cotton layer; meanwhile, the nano silicon dioxide and the EVA emulsion are used as the waterproof agent, so that the compatibility of EVA is utilized, the bonding performance between the waterproof layer and the foam layer is enhanced, and a rough surface structure can be formed on the surface of the foam material, so that the sponge adhesive tape has a better waterproof effect and a better bonding effect.

2. In this application, preferably adopt in the cotton material of bubble add the thermal expansion microcapsule, as the reaming material in advance, and then when heating, because thermal expansion microcapsule shell is heated the thermal expansion, carry out physical foaming, form stable cell, because the thermal expansion microcapsule supports the cell all the time, reduce the cell and bubble, broken bubble the possibility, and adopt hydrotalcite to modify the thermal expansion microcapsule, restrict the thermal expansion effect of thermal expansion microcapsule, make the cellular material form compact and even cell, consequently, the cotton layer of bubble has obtained better water-proof effects.

3. The method of this application is through in the cotton layer flooding of bubble in waterproofing agent for the cotton outer stable cladding of bubble has the waterproof layer, and isolated steam gets into the cotton layer of bubble, improves the water-proof effects on the cotton layer of bubble, and gives the cotton layer of bubble comparatively crude surface structure, improves the combination effect between the cotton layer of bubble and the tie coat. Therefore, the sponge adhesive tape obtains excellent bonding effect.

Detailed Description

The present application will be described in further detail with reference to examples.

In the embodiment of the present application, the selected apparatuses are as follows, but not limited thereto:

medicine preparation: EVA with the trade name of 260 of the Itanium plastic material company Limited in Dongguan city, an EVA emulsion 707 of Shandong Polymer chemistry company Limited, a release paper layer of RZBG100 of Shanghai Rusino industry Limited, a bonding layer of pressure-sensitive adhesive with the trade name of SA-227 of Anhui chemical industry Limited in Anhui, and a crosslinking agent of DCP of Jinan engineering chemical company Limited in Jinan.

Preparation example

Examples of preparation of modifier

Preparation examples 1 to 4

Hydrotalcite, polymethylhydrosiloxane and a silane coupling agent are respectively weighed, the specific mass is shown in table 1, and the hydrotalcite, the polymethylhydrosiloxane and the silane coupling agent are stirred and mixed to prepare 1-4 of the modifying agent, wherein the silane coupling agent is a silane coupling agent kh 550.

TABLE 1 preparation examples 1-4 modifier compositions

Preparation examples 5 to 8

1kg of thermal expansion microcapsules and 5kg of modifier 1-4 are taken and stirred and mixed to prepare the modified thermal expansion microcapsules 1-4.

Preparation of nanosilicon dioxide

Preparation examples 9 to 11

Cetyl trimethylammonium bromide, urea, ethyl orthosilicate, n-pentanol, and cyclohexane were weighed separately, the specific masses of which are shown in table 2. Placing hexadecyl trimethyl ammonium bromide, urea and water in a magnetic stirrer, stirring and mixing for 20min to prepare a mixed solution, adding tetraethoxysilane, n-amyl alcohol and cyclohexane into the mixed solution, stirring and mixing, condensing and refluxing for 4h at 120 ℃, centrifuging to retain precipitates, repeatedly centrifuging for 3 times, washing water and ethanol for 3 times respectively, and drying at 65 ℃ to prepare the nano silicon dioxide 1-3.

TABLE 2 PREPARATION EXAMPLES 9-11 NANOSILICA COMPOSITIONS

Preparation example 12

5kg of polyether sulfone and 1kg of nano-silica 2 are stirred and mixed, filtered, the solid is retained and dried to prepare the dispersed silica 1.

Preparation example 13

5kg of pentaerythritol stearate and 1kg of nano-silica 2 are stirred and mixed, filtered, the solid is retained and dried to prepare the dispersed silica 2.

Preparation example 14

5kg of quaternary ammonium salt and 1kg of nano silicon dioxide 2 are stirred and mixed, filtered, the solid is retained and dried to prepare the dispersed silicon dioxide 3.

Preparation of Water repellent

Preparation examples 15 to 18

The EVA emulsion, the nano-silica 1, the chopped polypropylene fiber and the trimethoxy silane are respectively weighed, the specific mass is shown in Table 3, and the waterproof agents 1-4 are prepared by stirring and mixing.

TABLE 3 preparative examples 15-18 nanosilica compositions

Preparation examples 19 to 23

The difference from preparation 17 is that: 2-3 parts of nano silicon dioxide and 1-3 parts of dispersed silicon dioxide are adopted to replace the nano silicon dioxide 1 to prepare 5-9 parts of a waterproof agent.

Preparation example of blowing agent

Preparation examples 24 to 26

Foaming agent DDL, foaming agent AC and foaming agent H are respectively weighed and stirred to be mixed to prepare foaming agents 1-3, and the specific mass is shown in Table 4.

TABLE 4 preparation examples 24-26 blowing agent silicon compositions

Examples of rubber preparation

Preparation examples 27 to 30

Butyl rubber, ethylene propylene diene monomer rubber and polyurethane are respectively weighed and stirred and mixed to obtain rubber 1-4, and the specific mass is shown in Table 5.

TABLE 5 preparation examples 27 to 30 rubber compositions

Examples

Examples 1 to 3

On the one hand, this application provides a sponge sticky tape, including the release paper layer that sets up in order, tie coat, bubble cotton layer and waterproof layer, bubble cotton layer includes the cotton material of bubble, and the cotton material of bubble includes following material, EVA, rubber 1, foamer 1 and cross-linking agent, and specific quality sees table 6. The waterproof layer is prepared by coating a waterproof agent 1.

On the other hand, the application provides a preparation method of the sponge adhesive tape, which comprises the steps of taking a foam material, stirring and mixing the foam material, adding the mixture into a mixing roll, plasticating and thinly passing the mixture at 40-45 ℃ to prepare a mixed rubber, remixing the mixed rubber into sheets, foaming the sheets in a foaming box at the foaming temperature of 120 ℃ to prepare a foam layer; soaking the foam layer in the waterproof agent 1 for 2min, taking out, standing, and drying to obtain a waterproof layer-coated foam layer, i.e. a primary product, coating an adhesive layer on one side of the primary product and coating a release paper layer to obtain the sponge adhesive tape 1-3.

Table 6 examples 1-3 nanosilica compositions

Examples 4 to 5

The difference from example 2 is that: foaming temperatures of 160 ℃ and 200 ℃ respectively, and preparing the sponge adhesive tape 4-5.

Examples 6 to 10

The difference from example 2 is that: 1.5kg of thermal expansion microcapsules or 1.5kg of modified thermal expansion microcapsules 1-4 are respectively added into the foam material to prepare the sponge adhesive tape 6-10.

Examples 11 to 18

The difference from example 2 is that: sponge tapes 11 to 18 were produced using water repellents 2 to 9 in place of the water repellent 1 of example 2.

Examples 19 to 21

The difference from example 2 is that: sponge tapes 19 to 21 were produced using rubbers 2 to 4 in place of rubber 1 in example 2.

Examples 22 to 23

The difference from example 2 is that: sponge tapes 22 to 23 were produced using foaming agents 2 to 3 in place of foaming agent 1 in example 2.

Comparative example

Comparative example 1

The difference from example 2 is that: the sponge tape 24 was prepared without dipping the foam layer in a waterproofing agent.

Comparative example 2

The difference from example 2 is that: the sponge tape 25 was prepared without adding a crosslinking agent.

Comparative example 3

The difference from example 2 is that: the sponge tape 26 is prepared by using only nano silica aerogel as a waterproofing agent.

Performance test

(1) And (3) testing the waterproof performance: the waterproof performance of the sponge tape is detected by adopting an industry standard IPX short-time soaking test and an IPX soaking tester, and the waterproof grades are IPX1, IPX2, IPX3, IPX4, IPX5, IPX6 and IPX 7.

(2) And (3) detecting the tensile strength and the elongation at break: testing the mechanical property of the foam layer according to GB/T6344-2008 determination of tensile strength and elongation at break of the soft foam polymer material;

(3) and (3) detecting the peeling strength: the peel strength of the sponge tape was determined according to the national standard GB/T2792-2014 test method for peel strength of adhesive tapes.

TABLE 7 Performance test of examples 1-23 and comparative examples 1-3

Referring to the comparison of the performance tests of table 7, it can be found that:

(1) by combining examples 1-3, examples 4-5, and comparative examples 1-2, it can be found that: the waterproof effect, the mechanical strength and the peel strength of the sponge tapes prepared in the examples 1 to 5 are improved, which shows that the foaming system and the crosslinking system are used together, so that on one hand, a stable crosslinking system is formed, and the mechanical property of the sponge tapes is enhanced; on the other hand, the size of the foam hole formed by the foaming agent is small, a compact and uniform closed hole structure is formed, and the waterproof effect and the mechanical strength of the sponge adhesive tape are synergistically improved. In addition, the foaming effect and the decomposition speed of the foaming agent are appropriate due to the appropriate temperature, the size and the distribution effect of the foam holes are improved, and the waterproof effect of the sponge adhesive tape is improved. As can be seen from Table 7, the foam layer of example 2 has a suitable ratio of the components and the foam layer of example 4 has a suitable foaming temperature.

(2) A comparison of example 6, and examples 7-10 and example 2, shows that: the waterproof effect, the mechanical strength and the peel strength of the sponge tapes prepared in examples 6 to 10 are all improved, which indicates that the application adopts the thermal expansion microcapsules added into the foam material to play a role in pre-reaming, support the foam holes and reduce the possibility of breaking or merging the foam holes. The modifier is adopted to modify the thermal expansion microcapsules, so that the surface energy of the thermal expansion microcapsules is reduced, the dispersion effect of the thermal expansion microcapsules among foam materials is improved, the uniformity of the distribution of foam holes in a foam layer is improved, and the waterproof performance of the sponge adhesive tape is improved. As can be seen from table 7, the sponge tape obtained in example 9 was the highest in water-proof effect and peel strength, indicating that the amount of the heat-sealed capsule added and the components in the modifier are suitable at this time.

(3) A comparison of examples 11 to 13, examples 14 to 15 and comparative example 3 shows that: the waterproof effect, the mechanical strength and the peel strength of the sponge tapes prepared in examples 11 to 18 are all improved, which indicates that the compatibility and the adhesion between the waterproof agent and the foam layer are improved by using nano-silica, EVA emulsion, polypropylene fiber and trimethoxy silane as the waterproof agent, and the roughness of the surface of the foam layer is improved by the flower-like structure of the nano-silica, so that a stable hydrophobic structure is formed, and the waterproof effect of the waterproof layer is stably enhanced. As can be seen from Table 7, the sponge tapes obtained in examples 12 and 14 have the highest water-proof effect and peel strength, which indicates that the ratio of the components in the water-proofing agent in example 12 is suitable, and the ratio of the nano-silica in example 14 is suitable.

(4) A comparison with examples 16 to 18 shows that: the waterproof effect, the mechanical strength and the peel strength of the sponge tapes prepared in examples 16 to 18 are all improved, which shows that the dispersing agent is adopted to disperse the nano-silica, so that the dispersing effect of the nano-silica in the waterproof agent is enhanced, the distribution effect of the surface roughness of the waterproof layer is improved, and the waterproof effect of the waterproof layer is improved.

(5) A comparison of examples 19 to 21 with example 2 shows that: in the embodiments 19 to 21, the waterproof effect and the peel strength of the sponge tape are improved, and the mechanical properties are significantly improved, which indicates that the compatibility and the crosslinking effect between the rubber and the EVA are improved by adopting the mutual cooperation of the butyl rubber, the ethylene propylene diene monomer and the polyurethane, so that an even and stable foam structure is formed in the foam layer, and the waterproof effect of the foam layer is improved. As can be seen from Table 7, the sponge tape obtained in example 21 exhibited the highest water-blocking effect and peel strength, indicating that the rubber composition used in example 21 was suitable for each component.

(6) A comparison of examples 22 to 23 with example 2 shows that: the waterproof effect, the mechanical strength and the peel strength of the sponge tapes prepared in examples 22 to 23 are all improved, which indicates that the foam material is foamed by stages by using the foaming agent, so that the foam holes formed by the foaming agent in the foam are uniform and dense, and the waterproof effect of the foam layer is enhanced. As can be seen from Table 7, the sponge tape obtained in example 22 showed the highest water-blocking effect and peel strength, indicating that the foaming agent used in example 21 had a suitable ratio of the components.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The sponge adhesive tape is characterized by comprising a release paper layer, a bonding layer, a foam layer and a waterproof layer which are sequentially arranged, wherein the foam layer comprises a foam material, and the foam material comprises the following substances in parts by weight: 50-60 parts of EVA (ethylene-vinyl acetate), 10-20 parts of rubber, 3-5 parts of foaming agent and 0.3-1 part of cross-linking agent, wherein the waterproof layer is prepared by coating waterproof agents, and the waterproof agents comprise the following substances in parts by weight: 20-30 parts of EVA emulsion and 5-10 parts of nano silicon dioxide.

2. The sponge tape as claimed in claim 1, wherein: the foam material also comprises thermal expansion microcapsules, wherein the thermal expansion microcapsules are modified thermal expansion microcapsules modified by a modifier, and the modifier comprises hydrotalcite.

3. The sponge tape as claimed in claim 2, wherein: the modifier also comprises polymethylhydrosiloxane and a silane coupling agent, wherein the mass ratio of the hydrotalcite to the polymethylhydrosiloxane to the silane coupling agent is 1:1-2: 4-6.

4. The sponge tape as claimed in claim 1, wherein: the waterproof agent also comprises chopped polypropylene fibers and trimethoxy silane, and the mass ratio of the EVA emulsion to the nano-silica to the chopped polypropylene fibers to the trimethoxy silane is 20-30:5-10:3-5: 6-8.

5. The sponge tape as claimed in claim 4, wherein: the preparation of the nano silicon dioxide comprises the following steps: respectively weighing the following substances in parts by weight: 0.5-1.5 parts of hexadecyl trimethyl ammonium bromide, 1-1.5 parts of urea, 3-6 parts of ethyl orthosilicate, 4-8 parts of n-amyl alcohol, 100 parts of water and 100 parts of cyclohexane, stirring and mixing the hexadecyl trimethyl ammonium bromide, the urea and the water to prepare a mixed solution, adding the ethyl orthosilicate, the n-amyl alcohol and the cyclohexane into the mixed solution, stirring and mixing, condensing and refluxing, centrifuging to retain precipitates, washing and drying to prepare the nano silicon dioxide.

6. The sponge tape as claimed in claim 5, wherein: the nano silicon dioxide is subjected to dispersion treatment by a dispersing agent, and the dispersing agent comprises any one of polyether sulfone, pentaerythritol stearate and quaternary ammonium salt.

7. The sponge tape as claimed in claim 1, wherein: the foaming agent comprises a foaming agent DDL, a foaming agent AC and a foaming agent H, wherein the mass ratio of the foaming agent DDL to the foaming agent AC to the foaming agent H is 5-15:80-90: 1-5.

8. The sponge tape as claimed in claim 1, wherein: the rubber comprises at least one of butyl rubber, ethylene propylene diene monomer rubber and polyurethane.

9. A method of making a sponge tape as claimed in any one of claims 1 to 8 comprising the steps of:

s1, preparing a foam layer: mixing the foam materials, plasticating, thinly passing to obtain rubber compound, remilling out a sheet, foaming at the foaming temperature of 120-200 ℃ to obtain a foam layer;

s2, preparing an adhesive tape: soaking the foam layer in a waterproof agent, taking out, standing to obtain the foam layer coated with a waterproof layer, namely a primary product, coating a bonding layer on one side of the primary product and covering a release paper layer to obtain the foam adhesive tape.