CN112680149A - Hot melt adhesive and preparation method and application thereof - Google Patents
Hot melt adhesive and preparation method and application thereof Download PDFInfo
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- CN112680149A CN112680149A CN202011515362.6A CN202011515362A CN112680149A CN 112680149 A CN112680149 A CN 112680149A CN 202011515362 A CN202011515362 A CN 202011515362A CN 112680149 A CN112680149 A CN 112680149A
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- 239000004831 Hot glue Substances 0.000 title claims abstract description 133
- 238000002360 preparation method Methods 0.000 title claims abstract description 41
- 229920001971 elastomer Polymers 0.000 claims abstract description 82
- 239000000806 elastomer Substances 0.000 claims abstract description 71
- 239000002245 particle Substances 0.000 claims abstract description 58
- 239000011347 resin Substances 0.000 claims abstract description 50
- 229920005989 resin Polymers 0.000 claims abstract description 50
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- 239000003963 antioxidant agent Substances 0.000 claims abstract description 19
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 19
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- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000002844 melting Methods 0.000 claims description 32
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- 239000000155 melt Substances 0.000 claims description 26
- 230000001681 protective effect Effects 0.000 claims description 17
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- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 8
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 8
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 8
- 239000005062 Polybutadiene Substances 0.000 claims description 5
- 229920002857 polybutadiene Polymers 0.000 claims description 5
- 229920000459 Nitrile rubber Polymers 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 3
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 2
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 2
- 239000012945 sealing adhesive Substances 0.000 abstract description 22
- 230000032683 aging Effects 0.000 abstract description 6
- 230000001954 sterilising effect Effects 0.000 abstract description 6
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 6
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 19
- 238000012360 testing method Methods 0.000 description 13
- 239000005060 rubber Substances 0.000 description 11
- 239000012943 hotmelt Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000004744 fabric Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000576 coating method Methods 0.000 description 5
- 239000003292 glue Substances 0.000 description 5
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- 239000002313 adhesive film Substances 0.000 description 2
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a hot melt adhesive, and relates to the technical field of hot melt adhesives. The hot melt adhesive comprises the following components in parts by weight: 70-90 parts of TPR hot melt adhesive particles, 10-25 parts of EVA hot melt adhesive, 0-0.4 part of antioxidant and 0.1-5 parts of naphthenic oil; the preparation method of the TPR hot melt adhesive particle comprises the following steps: (1) after a certain weight part of tackifying resin is completely melted, adding an elastomer, and uniformly mixing to obtain a mixture; (2) and (2) adding the rest tackifying resin and auxiliary elastomer into the mixture prepared in the step (1), stirring for 3-5h, and granulating to obtain the TPR hot melt adhesive particles. The hot melt adhesive provided by the invention has no pungent smell, and the materials and the preparation process are both environment-friendly and pollution-free. In addition, the invention also provides application of the hot melt adhesive in the heat-sealing adhesive tape, and the prepared heat-sealing adhesive tape can resist sterilization of ethylene oxide and 60-degree damp-heat aging, and can be used at low temperature and quickly.
Description
Technical Field
The invention relates to the technical field of hot melt adhesives, in particular to a hot melt adhesive and a preparation method and application thereof.
Background
(1) The protective clothing adhesive tape in the market is generally formed by combining a base material/a base film/base cloth with a hot melt adhesive, and when the protective clothing adhesive tape is used, the protective clothing adhesive tape can be sealed only by heating to more than 300 ℃ by using an air heater at the speed of 8-15 meters per minute and performing pressure heat sealing; can not be used quickly and at low temperature. (2) The common heat-sealing adhesive tape for protective clothing in the market is basically produced by coating through a solvent method, and the production process mainly comprises the steps of dissolving a plurality of raw materials (rubber SIS or EVA, tackifying resin, wax and the like) or hot melt adhesive blocks into glue water by using a toluene solvent, coating the glue water on release paper in a scraping manner, heating and drying the glue water to form an adhesive film, and compounding the adhesive film. Therefore, the production process needs to discharge harmful and toxic solvents, and has higher harm to the ecological environment, operators, surrounding residents and the like; meanwhile, chemical solvent sol is needed to be added, and then the film is coated and dried to volatilize the solvent, so that the production cost is higher and the productivity is low.
Disclosure of Invention
Based on the above, the invention aims to overcome the defects of the prior art and provide the tasteless and environment-friendly hot melt adhesive.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the hot melt adhesive comprises the following components in parts by weight: 70-90 parts of TPR hot melt adhesive particles, 10-25 parts of EVA hot melt adhesive, 0-0.4 part of antioxidant and 0.1-5 parts of naphthenic oil;
the preparation method of the TPR hot melt adhesive particle comprises the following steps: (1) after a certain weight part of tackifying resin is completely melted, adding an elastomer, and uniformly mixing to obtain a mixture; (2) and (2) adding the rest tackifying resin and auxiliary elastomer into the mixture prepared in the step (1), stirring for 3-5h, and granulating to obtain the TPR hot melt adhesive particles.
The hot melt adhesive with good bonding strength, low-temperature quick use and good water permeability resistance is obtained by creatively mixing the TPR hot melt adhesive particles and the EVA hot melt adhesive. According to the preparation method of the TPR hot melt adhesive particle, tackifying resin is added in batches, and two aspects are mainly considered: (1) the front adding part is mainly used for melting the SIS/SBS elastomer, so that the SIS elastomer with high molecular weight is cracked and broken into a product with low molecular weight, the product does not burn and discolor, and the product is broken into a product with required melt viscosity, thereby meeting the requirements of the invention; (2) the latter addition part plays a role in tackifying and adjusting the melt viscosity, bonding strength and fluidity of the adhesive. Meanwhile, the invention provides an auxiliary elastomer, aiming at improving the bonding strength and cold resistance of the hot melt adhesive.
Preferably, in the step (1) of the preparation method of the TPR hot melt adhesive particle, the tackifying resin is rosin resin or petroleum resin, the elastomer is SIS elastomer or SBS elastomer, and the melting temperature is 140-160 ℃.
Preferably, in the preparation method of the TPR hot melt adhesive particle, the mass of the tackifying resin added in the step (1) accounts for 30-60% of the total mass of the tackifying resin.
Preferably, in the preparation method of the TPR hot melt adhesive particle, the weight ratio of the tackifying resin, the elastomer and the auxiliary elastomer is as follows: tackifying resin: elastomer: auxiliary elastomer 50-75: 20-35: 5-15.
Through research, the following results are found: the more the addition amount of the SIS or SBS elastomer is, the more difficult the cracking and chain breaking of elastomer molecular chains into small molecules in the manufacturing process of the hot melt adhesive, and the larger the melt viscosity of the hot melt adhesive is, the higher the melting point is, the more adverse the use of the later heat-sealing adhesive tape is; on the contrary, the preparation of the hot melt adhesive and the use of the heat-sealing adhesive tape are more facilitated, but the addition amount of the SIS or SBS elastomer is too small, and the colloid of the hot melt adhesive has no strength; and an auxiliary elastomer with low glass transition temperature is added in the manufacturing process of the hot melt adhesive, so that the bonding strength and the cold resistance of the hot melt adhesive are improved.
Preferably, the hot melt adhesive comprises the following components in parts by weight: 80 parts of TPR hot melt adhesive particles, 20 parts of EVA hot melt adhesive, 0.2 part of antioxidant and 3 parts of naphthenic oil.
Preferably, the TPR hot melt rubber particle has a melt mass flow rate of 5-30g/10 min (90 ℃, 2.16Kg), a melting point of 70-120 ℃, and a melt viscosity of 4000-20000 mpa.s; the EVA hot melt adhesive has a VA content of 13-35% and a melting point of 80-120 ℃; the antioxidant is at least one of antioxidant 168, antioxidant 1010 and antioxidant 225; the naphthenic oil is at least one of K6H, K10H, KNH4006 and KNH 4010; the auxiliary elastomer is at least one of styrene butadiene rubber, butadiene rubber and nitrile butadiene rubber.
The smaller the melt viscosity is, the higher the flow speed is, the better the permeability of the heat-seal adhesive tape to the protective clothing fabric is, the easier the bonding is, the more easily the water seepage resistance is realized, and the lower the required use temperature is; on the contrary, the larger the melt viscosity is, the smaller the flow rate is, the larger the body strength of the glue is, the larger the strength of the heat-sealing adhesive tape is, the higher the tensile resistance is, the poor permeability to the fabric is, and the adhesion is not facilitated. The TPR hot melt adhesive particle prepared by the method has the best effect on the flow rate, the viscosity and the melting point.
Further preferably, the TPR hot melt adhesive particle has a melt mass flow rate of 15-25g/10 min (90 ℃, 2.16Kg), a melting point of 80-90 ℃, and a melt viscosity of 8000-14000 mpa.s; the EVA hot melt adhesive has a VA content of 19-35% and a melting point of 90-110 ℃.
Preferably, the EVA hot melt adhesive is at least one of VA19150, VA28150, VA33400, EVA680, EVA720 and EVA 750; among them, VA19150, VA28150 and VA33400 are purchased from LG chemical, and eva680, eva720 and eva750 are purchased from Tosoh corporation of Japan.
Preferably, the preparation method of the hot melt adhesive comprises the following steps: mixing the TPR hot melt adhesive particles, the EVA hot melt adhesive, the antioxidant and the naphthenic oil, adding the mixture into a double-screw extruder, and melting, plasticizing and extruding the mixture by the double-screw extruder to obtain the hot melt adhesive.
The hot melt adhesive prepared by adopting the preparation process of the double-screw extruder is free from adding a solvent in the preparation process, and the production is public and environment-friendly.
In addition, the invention also provides application of the hot melt adhesive in a heat-sealing adhesive tape.
Furthermore, the invention also provides application of the heat-sealing adhesive tape in protective clothing.
Compared with the prior art, the invention has the beneficial effects that: (1) the hot melt adhesive provided by the invention has no pungent smell, is environment-friendly, and reduces the pollution to the environment; (2) the hot melt adhesive provided by the invention is applied to the heat-sealing adhesive tape, and the prepared heat-sealing adhesive tape can resist sterilization of ethylene oxide and 60-degree damp-heat aging, and can be used at low temperature and quickly.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
According to an embodiment of the application, the hot melt adhesive disclosed by the embodiment of the invention comprises the following components in parts by weight: 70 parts of TPR hot melt adhesive particles, 10 parts of EVA hot melt adhesive (VA19150), 0.4 part of antioxidant and 0.1 part of naphthenic oil; after the components are weighed according to the components, the preparation method of the hot melt adhesive comprises the following steps: mixing the TPR hot melt adhesive particles, the EVA hot melt adhesive, the antioxidant and the naphthenic oil, adding the mixture into a double-screw extruder, and melting, plasticizing and extruding the mixture by the double-screw extruder to obtain the hot melt adhesive.
The preparation method of the TPR hot melt adhesive particle comprises the following steps: (1) after 30% of rosin resin or petroleum resin is completely melted, the melting temperature is 140 ℃, adding the SIS elastomer, and uniformly mixing to obtain a mixture; (2) adding the rest of the rosin resin and the auxiliary elastomer styrene butadiene rubber into the mixture prepared in the step (1), stirring for 3 hours, and granulating to obtain TPR hot melt rubber particles; wherein the weight ratio of the tackifying resin to the elastomer to the auxiliary elastomer is as follows: tackifying resin: elastomer: auxiliary elastomer 65: 20: 15. the melt mass flow rate of the prepared TPR hot melt rubber particles is 30g/10 min (90 ℃, 2.16Kg), the melting point is 70 ℃, and the melt viscosity is 4000 mpa.s.
Example 2
According to an embodiment of the application, the hot melt adhesive disclosed by the embodiment of the invention comprises the following components in parts by weight: 80 parts of TPR hot melt adhesive particles, 20 parts of EVA hot melt adhesive (EVA750), 0.2 part of antioxidant and 3 parts of naphthenic oil; after the components are weighed according to the components, the preparation method of the hot melt adhesive comprises the following steps: mixing the TPR hot melt adhesive particles, the EVA hot melt adhesive, the antioxidant and the naphthenic oil, adding the mixture into a double-screw extruder, and melting, plasticizing and extruding the mixture by the double-screw extruder to obtain the hot melt adhesive.
The preparation method of the TPR hot melt adhesive particle comprises the following steps: (1) after 50% of rosin resin or petroleum resin is completely melted, the melting temperature is 160 ℃, SBS elastomer is added, and the mixture is uniformly mixed to obtain a mixture; (2) adding the rest rosin resin and the auxiliary elastomer butadiene rubber into the mixture prepared in the step (1), stirring for 5 hours, and granulating to obtain TPR hot melt rubber particles; wherein the weight ratio of the tackifying resin to the elastomer to the auxiliary elastomer is as follows: tackifying resin: elastomer: auxiliary elastomer 60: 30: 10. the melt mass flow rate of the prepared TPR hot melt rubber particles is 15g/10 min (90 ℃, 2.16Kg), the melting point is 100 ℃, and the melt viscosity is 10000 mpa.s.
Example 3
According to an embodiment of the application, the hot melt adhesive disclosed by the embodiment of the invention comprises the following components in parts by weight: 90 parts of TPR hot melt adhesive particles, 25 parts of EVA hot melt adhesive (VA28150), 0.4 part of antioxidant and 5 parts of naphthenic oil; after the components are weighed according to the components, the preparation method of the hot melt adhesive comprises the following steps: mixing the TPR hot melt adhesive particles, the EVA hot melt adhesive, the antioxidant and the naphthenic oil, adding the mixture into a double-screw extruder, and melting, plasticizing and extruding the mixture by the double-screw extruder to obtain the hot melt adhesive.
The preparation method of the TPR hot melt adhesive particle comprises the following steps: (1) completely melting 60% of petroleum resin or the petroleum resin at 160 ℃, adding the SIS elastomer, and uniformly mixing to obtain a mixture; (2) adding the rest petroleum resin and auxiliary elastomer (mixture of butadiene rubber and nitrile rubber) into the mixture prepared in the step (1), stirring for 4 hours, and granulating to obtain the TPR hot melt adhesive particles; wherein the weight ratio of the tackifying resin to the elastomer to the auxiliary elastomer is as follows: tackifying resin: elastomer: auxiliary elastomer 50: 35: 15. the melt mass flow rate of the prepared TPR hot melt rubber particles is 5g/10 min (90 ℃, 2.16Kg), the melting point is 120 ℃, and the melt viscosity is 20000 mpa.s.
Example 4
According to an embodiment of the application, the hot melt adhesive disclosed by the embodiment of the invention comprises the following components in parts by weight: 80 parts of TPR hot melt adhesive particles, 20 parts of EVA hot melt adhesive (EVA720), 0 part of antioxidant and 0.1 part of naphthenic oil; after the components are weighed according to the components, the preparation method of the hot melt adhesive comprises the following steps: mixing the TPR hot melt adhesive particles, the EVA hot melt adhesive and the naphthenic oil, adding the mixture into a double-screw extruder, and melting, plasticizing and extruding the mixture by the double-screw extruder to obtain the hot melt adhesive.
The preparation method of the TPR hot melt adhesive particle comprises the following steps: (1) after 30% of rosin resin is completely melted, the melting temperature is 140 ℃, the SIS elastomer is added, and the mixture is uniformly mixed to obtain a mixture; (2) adding the rest rosin resin and the auxiliary elastomer butadiene rubber into the mixture prepared in the step (1), stirring for 3 hours, and granulating to obtain TPR hot melt rubber particles; wherein the weight ratio of the tackifying resin to the elastomer to the auxiliary elastomer is as follows: tackifying resin: elastomer: auxiliary elastomer 70: 25: 5. the melt mass flow rate of the prepared TPR hot melt rubber particles is 20g/10 min (90 ℃, 2.16Kg), the melting point is 90 ℃, and the melt viscosity is 8000 mpa.s.
Example 5
According to an embodiment of the application, the hot melt adhesive disclosed by the embodiment of the invention comprises the following components in parts by weight: 80 parts of TPR hot melt adhesive particles, 20 parts of EVA hot melt adhesive (EVA680), 0.2 part of antioxidant and 3 parts of naphthenic oil; after the components are weighed according to the components, the preparation method of the hot melt adhesive comprises the following steps: mixing the TPR hot melt adhesive particles, the EVA hot melt adhesive and the naphthenic oil, adding the mixture into a double-screw extruder, and melting, plasticizing and extruding the mixture by the double-screw extruder to obtain the hot melt adhesive.
The preparation method of the TPR hot melt adhesive particle comprises the following steps: (1) after 30% of petroleum resin is completely melted, the melting temperature is 140 ℃, adding the SIS elastomer, and uniformly mixing to obtain a mixture; (2) adding the rest petroleum resin and the auxiliary elastomer nitrile rubber into the mixture prepared in the step (1), stirring for 3 hours, and granulating to obtain TPR hot melt rubber particles; wherein the weight ratio of the tackifying resin to the elastomer to the auxiliary elastomer is as follows: tackifying resin: elastomer: auxiliary elastomer 65: 30: 8. the melt mass flow rate of the prepared TPR hot melt rubber particles was 10g/10 min (90 ℃, 2.16Kg), the melting point was 110 ℃ and the melt viscosity was 14000 mpa.s.
Meanwhile, the application sets comparative examples, and specific comparative examples 1 to 6 set as follows:
in the preparation method of the TPR hot melt adhesive particle in the comparative example 1, tackifying resin is added at one time, and the rest components, the parts by weight and the preparation method are completely the same as those in the example 2;
in the preparation method of the TPR hot melt adhesive particle described in comparative example 2, the weight ratio of the tackifying resin, the elastomer and the auxiliary elastomer is: tackifying resin: elastomer: auxiliary elastomer 50: 40: 10, the melt mass flow rate of the prepared TPR hot melt adhesive particles is 2g/10 min (90 ℃, 2.16Kg), the melting point is 130 ℃, the melt viscosity is 22000mpa.s, and the rest components, the parts by weight and the preparation method are completely the same as those of the example 2;
in the preparation method of the TPR hot melt adhesive particle described in comparative example 3, the weight ratio of the tackifying resin, the elastomer and the auxiliary elastomer is: tackifying resin: elastomer: auxiliary elastomer 80: 15: 5, the melt mass flow rate of the prepared TPR hot melt adhesive particles is 30g/10 min (90 ℃, 2.16Kg), the melting point is 70 ℃, the melt viscosity is 3500mpa.s, and the rest components, the parts by weight and the preparation method are completely the same as those in the example 2;
the VA content of the EVA hot melt adhesive in the comparative example 4 is 10%, and the rest components, the parts by weight and the preparation method are completely the same as those in the example 2;
the comparative example 5 does not contain EVA hot melt adhesive, and the rest components, the parts by weight and the preparation method are completely the same as the example 2;
comparative example 6 does not contain TPR hot melt adhesive particles, and the rest components, the parts by weight and the preparation method are completely the same as those of example 2;
the preparation method of the TPR hot melt adhesive particle described in comparative example 7 does not include an auxiliary elastomer, and the remaining components, parts by weight, and preparation method are completely the same as those of example 2.
Test example 1 Performance test
The hot melt adhesives prepared in the examples 1 to 5 and the comparative examples 1 to 7 of the invention are applied to a heat sealing adhesive tape for performance test.
The preparation process comprises the following steps: comprises the following steps: (1) thermally compounding the base cloth and the waterproof film layer to obtain a cloth base material; (2) coating a coating with the thickness of 0.05mm on the waterproof film layer of the cloth base material in the step 1) on the hot melt adhesive prepared in the examples 1-5 and the comparative examples 1-7 to obtain a heat-sealing adhesive tape for protective clothing; (3) the prepared heat-sealing adhesive tape is pressed on the protective clothing fabric with the PE film under the conditions of 240 ℃, 22 meters per minute and 0.08 air volume, and the performance is tested, and the results are shown in the following table 2:
and (4) testing standard: the test criteria are shown in table 1 below:
TABLE 1 Performance test standards
| Detecting items | Detection standard | Technical index |
| Breaking strength of adhesive tape | GB 19082 | ≥45N |
| Elongation at break of adhesive tape | GB 19082 | ≥15％ |
| Transverse rupture strength (straight seam position) | ASTM D1683 | ≥50N |
| Peel strength | Stripping protective garment coatings | |
| Water impermeability (Cross joint of pressure adhesive tapePosition) | GB 19082 | ≥1.67kpa |
| Sterilization mode (protective clothing with pressure adhesive tape) | GB 19082 | Ethylene oxide sterilization |
Table 2 examples 1-5 performance test results
TABLE 3 comparative examples 1-7 Performance test results
As can be seen from tables 2 and 3, the protective clothing tapes prepared by different preparation methods (feeding sequence), or without TPR hot melt adhesive or according to the mixture ratio and physical property ranges of the invention (such as comparative examples 1, 2, 3 and 6) have poor sterilization resistance, high use temperature, poor performance or sticky tape surface, and cannot be used in practice; the heat-sealing adhesive tape (such as comparative examples 4 and 5) which does not contain the EVA hot melt adhesive or contains low VA in the EVA hot melt adhesive has the performance which can meet the use requirement of protective clothing, but compared with the heat-sealing adhesive tape disclosed by the invention, the heat-sealing adhesive tape has relatively poor water impermeability, poor dryness, higher use temperature and lower adhesive pressing speed (more than or equal to 350 ℃ and 10-15 meters). Comparative example 7 contains no auxiliary elastomer, and the heat-seal adhesive tape obtained has properties meeting the use requirements of protective clothing, but has a certain difference in strength compared with the present invention. The heat-sealing adhesive tape disclosed by the invention does not need to be used at a high temperature, can be used for pressing adhesive at the temperature of between 220 and 300 ℃, is high in using speed and can reach the speed of 20-30 meters per minute, and the manufactured product has better resistance to sterilization of ethylene oxide and water impermeability.
Test example 2 humid heat aging test
And (4) testing standard: the test was carried out according to YY/T0681.1-2009 at 60 ℃ and 62% humidity, with the test standards as shown in Table 4;
and (3) testing results: the heat-seal tapes prepared in examples 1 to 5 and the heat-seal tapes of comparative examples 1 to 6 were applied to protective clothing and tested, and the test results are shown in table 5;
TABLE 4 Damp-Heat aging test standards
| Is excellent in | Good effect | In general | Difference (D) | |
| Scoring criteria | 4 weeks without glue failure | After 3 weeks, the gel is broken | After 1 week, the gel is broken | After 1 day, the gel is broken |
TABLE 5 Damp-Heat aging test results
As can be seen from tables 4 and 5, the hot melt adhesive prepared in the examples is applied to heat-sealing adhesive tapes and protective clothing, and has no adhesive-splitting phenomenon after 4 weeks of a damp-heat aging test, and still has good effect at 60 ℃ and 62% humidity, while the heat-sealing adhesive tapes of comparative examples 1, 2, 3, 6 and 4 have too much damp-heat resistant effect which is common or poor, the heat-sealing adhesive tape of comparative example 7 does not contain an auxiliary elastomer and the heat-sealing adhesive tape of comparative example 5 does not contain auxiliary EVA, and the adhesive-splitting phenomenon after 3 weeks of the obtained heat-sealing adhesive tape shows that the protective clothing adhesive tape prepared without the EVA hot melt adhesive, without the auxiliary elastomer or without the scheme and the physical property range of the invention has relatively poor damp-heat resistant.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The hot melt adhesive is characterized by comprising the following components in parts by weight: 70-90 parts of TPR hot melt adhesive particles, 10-25 parts of EVA hot melt adhesive, 0-0.4 part of antioxidant and 0.1-5 parts of naphthenic oil;
the preparation method of the TPR hot melt adhesive particle comprises the following steps: (1) after a certain weight part of tackifying resin is completely melted, adding an elastomer, and uniformly mixing to obtain a mixture; (2) and (2) adding the rest tackifying resin and auxiliary elastomer into the mixture prepared in the step (1), stirring for 3-5h, and granulating to obtain the TPR hot melt adhesive particles.
2. The hot melt adhesive according to claim 1, wherein in step (1) of the preparation method of the TPR hot melt adhesive particles, the tackifying resin is rosin resin or petroleum resin, the elastomer is SIS elastomer or SBS elastomer, and the melting temperature is 140 ℃ and 160 ℃.
3. The hot melt adhesive according to claim 1, wherein in the preparation method of the TPR hot melt adhesive particles, the mass of the tackifying resin added in the step (1) accounts for 30-60% of the total mass of the tackifying resin.
4. The hot melt adhesive according to claim 1, wherein in the preparation method of the TPR hot melt adhesive particles, the weight ratio of the tackifying resin to the elastomer to the auxiliary elastomer is as follows: tackifying resin: elastomer: auxiliary elastomer 50-75: 20-35: 5-15.
5. The hot melt adhesive according to any one of claims 1 to 4, comprising the following components in parts by weight: 80 parts of TPR hot melt adhesive particles, 20 parts of EVA hot melt adhesive, 0.2 part of antioxidant and 3 parts of naphthenic oil.
6. The hot melt adhesive according to claim 5, wherein the TPR hot melt adhesive particles have a melt mass flow rate of 5-30g/10 min, a melting point of 70-120 ℃, and a melt viscosity of 4000-;
the EVA hot melt adhesive has a VA content of 13-35% and a melting point of 80-120 ℃; the antioxidant is at least one of antioxidant 168, antioxidant 1010 and antioxidant 225; the naphthenic oil is at least one of K6H, K10H, KNH4006 and KNH 4010; the auxiliary elastomer is at least one of styrene butadiene rubber, butadiene rubber and nitrile butadiene rubber.
7. The hot melt adhesive of claim 6, wherein the TPR hot melt adhesive particles have a melt mass flow rate of 15-25g/10 min, a melting point of 80-90 ℃, and a melt viscosity of 8000-14000 mpa.s; the EVA hot melt adhesive has a VA content of 19-35% and a melting point of 90-110 ℃.
8. The method for preparing the hot melt adhesive according to any one of claims 1 to 7, comprising the following steps: mixing the TPR hot melt adhesive particles, the EVA hot melt adhesive, the antioxidant and the naphthenic oil, adding the mixture into a double-screw extruder, and melting, plasticizing and extruding the mixture by the double-screw extruder to obtain the hot melt adhesive.
9. Use of the hot melt adhesive according to any one of claims 1 to 7 in heat-seal adhesive tapes.
10. Use of the heat-seal tape of claim 9 in protective clothing.
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