CN112266735B - Adhesive for disposable non-woven protective clothing adhesive tape and preparation method thereof - Google Patents
Adhesive for disposable non-woven protective clothing adhesive tape and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/21—Paper; Textile fabrics
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/04—Homopolymers or copolymers of ethene
- C09J123/08—Copolymers of ethene
- C09J123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C09J123/0853—Vinylacetate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2423/00—Presence of polyolefin
- C09J2423/04—Presence of homo or copolymers of ethene
- C09J2423/046—Presence of homo or copolymers of ethene in the substrate
Abstract
The invention relates to the technical field of adhesion, in particular to an adhesive for a disposable non-woven protective clothing adhesive tape and a preparation method thereof. The adhesive is prepared by melting and extruding the materials in a mode of adding ethylene-vinyl acetate copolymer and tackifying resin step by step. Through adding glass fiber in this application can improve the cohesiveness of hot melt adhesive, also can improve the ability that the hot melt adhesive keeps high cohesiveness under high humidity environment simultaneously.
Description
Technical Field
The invention relates to the technical field of hot melt adhesives, in particular to an adhesive for a disposable non-woven protective clothing adhesive tape, and a preparation method of the adhesive for the disposable non-woven protective clothing adhesive tape.
Background
A medical protective garment is a protective garment used to protect medical personnel when entering an infected area or performing medical first aid. In an infectious disease area or a medical first-aid process, substances such as bacteria, viruses, harmful ultrafine dust and the like can float in the air, and a zipper structure on the protective clothing has a large gap, so that the protective clothing cannot play a protective role. Therefore, in actual use, the zipper on the protective clothing needs to be attached by using the adhesive tape, so that the protection capability of the protective clothing is enhanced.
Chinese patent with application publication No. CN103773293A and application publication date of 2014, 5, 7 discloses a styrene thermoplastic elastomer-based hot melt pressure sensitive adhesive capable of being coated at low temperature, which is characterized in that a linear or star-shaped SIS or SBS thermoplastic elastomer provides sufficient physical crosslinking point and cohesive strength for a system through a long styrene block, and the glass transition temperature and the processing temperature of the system are adjusted through the length and the proportion of a short styrene block.
As the adhesive tape falls off once the protective clothing is used, workers wearing the protective clothing are directly exposed to dangerous environments. Therefore, a stronger adhesive strength is required for the hot melt adhesive used on the protective clothing tape, compared to the pressure-sensitive adhesive in the prior art described above. In addition, the environmental humidity is generally high during the use of protective clothing, so the adhesive tape used on the protective clothing also needs to have the capability of keeping strong bonding strength under the high humidity environment.
Disclosure of Invention
Aiming at the defects in the prior art, the first invention aims to provide the adhesive for the disposable non-woven protective clothing adhesive tape, which has strong bonding strength and can keep strong bonding capability in a high-humidity environment.
The second invention aims to provide a preparation method of the adhesive for the adhesive tape of the disposable non-woven protective clothing, which can reduce the loss of raw materials in the preparation process and improve the production efficiency and the quality of the produced adhesive for the adhesive tape.
The first invention purpose of the invention is realized by the following technical scheme: the adhesive for the adhesive tape of the disposable non-woven protective clothing comprises the following components in parts by mass:
17-19 parts of a styrene thermoplastic elastomer;
0.6-1.3 parts of an antioxidant;
8-10 parts of a softener;
20-35 parts of tackifying resin;
1.1-2.6 parts of glass fiber;
adding ethylene-vinyl acetate copolymer to 100 portions.
In the technical scheme, the glass fiber has better mechanical strength and stronger surface energy, the surface of the glass fiber is mainly of a silicate structure, holes are easy to appear, and the glass fiber has better coupling property. The glass fiber material has good hydrophobicity, and when the hot melt adhesive absorbs water, the water is not easy to agglomerate in the hot melt adhesive to form a large water mass under the separation effect of the glass fiber, so that the hot melt adhesive is favorably kept to have good cohesive force under the condition of high humidity. In addition, the glass fiber can play the role of anchoring the adhesive layer in the length direction of the glass fiber, so that the adhesive layer is not easy to crack, and the durability and the bonding capability of the hot melt adhesive are further improved.
The ethylene-vinyl acetate copolymer has strong polarity, good miscibility and strong ageing resistance, has strong main body bonding capability as the hot melt adhesive, has low minimum film forming temperature, is easy to form a film and block moisture, and further improves the waterproof performance of the hot melt adhesive. The styrene thermoplastic elastomer has better dissolvability and stronger cohesive force. Therefore, the adhesive system formed by the combined action of the ethylene-vinyl acetate copolymer and the styrene thermoplastic elastomer is uniformly mixed, the interior of the adhesive system is not easy to crack, and the integral strength of the hot melt adhesive is improved. And the two do not need practical aromatic solvents in the melting process, so the harm to human bodies is small, and the requirements of green and environmental protection are met. The tackifying resin can improve the viscosity of the rubber material, so that the combination of the hot melt adhesive and the surface of the adhesive tape and the combination of the hot melt adhesive and the surface of the protective clothing are tighter. The softening agent helps to improve the overall fluidity of the hot melt adhesive, and is convenient for processing, transporting and storing the hot melt adhesive.
The invention in a preferred example may be further configured to: the length of the glass fiber is not more than 0.2 mm.
In the technical scheme, the glass fibers with shorter length are adopted, so that the glass fibers are favorably arranged in the adhesive layer in a disordered manner, the rigidity of the adhesive layer is reduced, the softness of the adhesive layer is improved, the glass fibers are favorably and closely attached to the adhered non-woven fabric, and the adhesive force of the adhesive layer is improved; on the other hand, shorter glass fiber can form similar reticular structure to keep apart adsorbed a small amount of moisture in the glue film more effectively, restrain the hydrone and remove in the glue film, and then make the glue film adsorb too much moisture in being difficult for the glue film under the high humidity condition, lead to moisture to reunite and make the glue film lose the adhesion stress, therefore can further improve the waterproof performance of this hot melt adhesive.
The present invention in a preferred example may be further configured to: and also comprises 0.5-1 part of a fluorescence shielding agent.
The fluorescent shielding agent is also called as a fluorescent eliminating agent and can be used for eliminating fluorescence generated by unclosed terminal groups of high polymer materials in the hot melt adhesive in the production process of the hot melt adhesive. After absorbing external ultraviolet radiation or thermal radiation, part of macromolecules in the hot melt adhesive make electrons absorb energy and transit to a high-energy level, so that the molecules are in a high-energy level excited state, and then the electrons can release the energy in the form of fluorescence in the process of returning to the original track. In the process, when electrons in the high-molecular material are in a high-energy-level excited state, the reaction activity is good, a series of side reactions are easy to generate, and then high molecules such as ethylene-vinyl acetate copolymer, tackifying resin and the like are damaged, so that the overall bonding capability of the hot melt adhesive is reduced.
The energy level difference between the highest occupied molecular orbit and the lowest vacant orbit of the fluorescence eliminator is similar to that of the high molecular substance in the hot melt adhesive, so that the high molecular substance in an excited state in the hot melt adhesive is easily and quickly subjected to energy exchange with the basic state molecules in the fluorescence eliminator in the excited state, the retention time of the high molecules in the hot melt adhesive in the excited state is shortened, the effect of protecting the high molecular components in the hot melt adhesive is achieved, and the service life and the storage life of the hot melt adhesive are prolonged.
The present invention in a preferred example may be further configured to: the antioxidant consists of a free radical quencher, a peroxide quencher, a superoxide anion quencher and an ultraviolet absorbent.
In the technical scheme, as the tackifying resin has more double bond structures in molecules, and alpha-hydrogen of the double bond structures is easily oxidized in the air to form free radicals, so that high molecules are broken, the free radicals generated in the system can be eliminated by adding the free radical quenching agent, and the weather resistance of the hot melt adhesive is improved. The ultraviolet absorbent can absorb external ultraviolet rays, so that the ultraviolet rays absorbed by the ethylene-vinyl acetate copolymer, the styrene thermoplastic elastomer and the tackifying resin in the hot melt adhesive are reduced, and the effect of protecting the high molecular substances is achieved. In the ethylene-vinyl acetate copolymer, the styrene thermoplastic elastomer and the tackifying resin, double bonds such as ester groups, vinyl groups and the like can absorb oxygen in the air to form peroxide and superoxide anions, so that the generation of the two active oxygen substances can be reduced after the peroxide quencher and the superoxide anion quencher are added, and the high molecular substances are further protected from being easily cracked or cracked. The service life and the storage life of the hot melt adhesive can be greatly prolonged under the combined action of the four antioxidants.
The present invention in a preferred example may be further configured to: the softening agent is microcrystalline wax; the petroleum resin is hydrogenated C5 petroleum resin.
The microcrystalline wax mainly contains 31-70 carbon saturated alkane, has good viscosity and ductility, and can effectively prevent the high molecular substances from being separated out when being blended with the ethylene-vinyl acetate copolymer, the styrene thermoplastic elastomer and the tackifying resin, so that the whole structure of the hot melt adhesive is uniform and stable. Compared with paraffin, the microcrystalline wax has smaller particles, better ductility and melting property, better glossiness and lighter color, and is more suitable for the production process of the hot melt adhesive. In the hydrogenated C5 petroleum resin, double bonds in the petroleum resin are reduced, so that single chains of the hydrogenated C5 petroleum resin have better flexibility and oxidation resistance, and are favorable for improving the fluidity, aging resistance and viscosity of the hot melt adhesive.
The second invention purpose of the invention is realized by the following technical scheme: a preparation method of the adhesive for the adhesive tape of the disposable non-woven protective clothing comprises the following steps:
the method comprises the following steps:
s1: preparing materials, namely weighing ethylene-vinyl acetate copolymer, styrene thermoplastic elastomer, glass fiber, antioxidant, softener, tackifying resin and fluorescent shielding agent in parts by weight;
s2: mixing all the softening agents and 42-60% by mass of tackifying resin, heating to 145-150 ℃, and melting and uniformly mixing the materials to obtain a first mixed phase;
s3: mixing a styrene thermoplastic elastomer with glass fibers, and adding the mixture into the first mixed phase to obtain a second mixed phase;
s4: adding the rest tackifying resin, all the fluorescent shielding agent and the antioxidant into the second mixed phase, adding an ethylene-vinyl acetate copolymer accounting for 50-67% of the total mass, heating to 140-150 ℃, melting and uniformly mixing to obtain a third mixed phase;
s5: adding an ethylene-vinyl acetate copolymer into the third mixed phase, uniformly mixing, heating to 160-170 ℃, introducing nitrogen, and keeping for 3-10 min to obtain a crosslinked mixed phase;
s6: vacuumizing the crosslinked mixed phase to-0.1 MPa, keeping for 10-20 min, and continuing to react until a homogeneous phase is formed;
s7: discharging after the product is stable;
s8: filtering, cooling and packaging.
In the technical scheme, the ethylene-vinyl acetate copolymer is added into the third mixed phase, then nitrogen is introduced and the third mixed phase is heated to 160-170 ℃, in the process, under the protection of nitrogen, a plurality of macromolecules in the system are not easily oxidized and deteriorated, and the improvement of the prepared hot melt adhesive is facilitated. And then, the antioxidant and the fluorescence shielding agent are added after the temperature is reduced, and the antioxidant and the fluorescence shielding agent are not easy to lose in the processing process in the production process.
In addition, in the process, as the tackifying resin and the acetic acid-vinyl acetate copolymer are added into the system twice, the uniform morphological structure of the hot melt adhesive in the whole processing process can be ensured, and the quality of the hot melt adhesive obtained by processing can be improved. In addition, in step S6, the evacuation helps to reduce the oxidation degree of the system, enhances the mixing effect, and further improves the strength of the hot melt adhesive.
The present invention in a preferred example may be further configured to: in step S6, the reaction system is vacuumized and subjected to ultrasonic waves for 25-30 min.
In the technical scheme, defoaming is assisted by vacuum and ultrasound together, so that residual air in the system is discharged quickly, oxygen in the air is inhibited from further oxidizing other materials in the system, and the content of bubbles in the produced hot melt adhesive is reduced, thereby being beneficial to improving the quality of the produced hot melt adhesive. In addition, the ultrasonic wave assistance is also beneficial to the full crosslinking of the macromolecules in the system, so that the obtained glue line has better stability and water resistance.
The invention in a preferred example may be further configured to: in step S7, the discharging temperature is 125-135 ℃, and the discharging port is pressurized to 0.05-0.1 MPaMPa during discharging.
In the technical scheme, the stable temperature and pressure are kept in the discharging process, so that the continuity of discharging of the hot melt adhesive is facilitated, and the production efficiency is improved. Meanwhile, the highest pressure is set to be below 0.1MPa, which is beneficial to further improving the performance of the obtained hot melt adhesive under the condition of keeping stable discharging.
In summary, the invention includes at least one of the following beneficial technical effects:
1. in the invention, the components of the hot melt adhesive comprise glass fiber, ethylene-vinyl acetate copolymer and styrene thermoplastic elastomer, and the strength and the moisture resistance of the hot melt adhesive are improved through the positioning effect of the glass fiber.
2. The invention provides a preparation method of the adhesive for the adhesive tape of the disposable non-woven protective clothing, the hot melt adhesive is prepared through multi-step reaction, the loss of materials such as an antioxidant, a fluorescent shielding agent and the like can be reduced in the process, the system is relatively uniform in the preparation process, and the quality of the prepared hot melt adhesive can be improved.
Detailed Description
The present invention will be described in further detail below.
In the following embodiments, parts refer to parts by mass, and each part of a material refers to 100g of the material.
Example 1: the adhesive for the disposable non-woven protective clothing adhesive tape comprises the following components:
17 parts of styrene thermoplastic elastomer;
1.3 parts of an antioxidant;
8 parts of a softener;
32 parts of tackifying resin;
1.8 parts of glass fiber;
0.5 part of a fluorescence shielding agent;
and 39.4 parts of ethylene-vinyl acetate.
The glass fiber is glass short fiber with the length range of 0.1-0.2 mm, and the antioxidant is composed of a free radical quencher, a peroxide quencher, a superoxide quencher and an ultraviolet absorbent in a mass ratio of 1:1.7:1.4: 3.9. Wherein the free radical quencher is RIANOX1010, the peroxide quencher is bis (3, 5-tertiary butyl-4-hydroxyphenyl) thioether, the superoxide anion quencher is benzoquinone, and the ultraviolet absorbent is titanium dioxide. The softener is microcrystalline wax, and the petroleum resin is hydrogenated C5 petroleum resin. The styrene thermoplastic elastomer is styrene-butadiene-styrene block copolymer.
The adhesive for the disposable non-woven protective clothing adhesive tape is prepared by the following steps:
s1: preparing materials, namely weighing the materials in parts by weight;
s2: weighing 50% of tackifying resin in the materials, mixing with all softening agents, mixing, heating to 145 ℃, melting the materials, and uniformly stirring to obtain a first mixed phase;
s3: mixing a styrene thermoplastic elastomer and glass fibers and adding the mixture into the first mixed phase to obtain a second mixed phase;
s4: mixing the rest tackifying resin, all the fluorescent shielding agent and the antioxidant, adding the mixture into a second mixed phase, adding an ethylene-vinyl acetate copolymer accounting for 50% of the total mass, heating to 140 ℃, and stirring and mixing uniformly to obtain a third mixed phase;
s5: adding the rest ethylene-vinyl acetate copolymer into the third mixed phase, uniformly mixing, heating to 160 ℃, introducing nitrogen, and keeping for 10min to obtain a cross-linked mixed phase;
s6: controlling the temperature of the crosslinking mixed phase, vacuumizing to-0.1 MPa, applying ultrasonic waves of 20kHz, and stirring for 25 min;
s7: stopping stirring, and discharging after the product is stable; the temperature of the discharge port is kept at 135 ℃, and the discharge port is pressurized to 0.1MPa during discharging;
s8: filtering, cooling and packaging.
Examples 2 to 6: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: the contents of the materials were different.
Comparative examples 1 to 3: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: the contents of the materials were different.
The material compositions in examples 1 to 6 and comparative examples 1 to 3 are specifically shown in Table 1.
Example 6: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive used in the embodiment 1 in that the length of the used glass fiber is 0.5-0.6 mm.
Example 7: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: the softener is liquid paraffin.
Example 8: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: the tackifying resin is C5 petroleum resin.
Example 9: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: the antioxidant comprises a free radical quencher, a peroxide quencher and a superoxide anion quencher in a mass ratio of 1:1.7: 1.4.
Example 10: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: the antioxidant comprises a free radical quencher, a peroxide quencher and an ultraviolet absorbent in a mass ratio of 1:1.7: 3.9.
Example 11: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: the antioxidant comprises a free radical quencher, a superoxide anion quencher and an ultraviolet absorbent in a mass ratio of 1:1.4: 3.9.
Example 12: the adhesive for the adhesive tape of the disposable non-woven protective clothing is different from the adhesive tape of the embodiment 1 in that: the antioxidant consists of a peroxide quencher, a superoxide anion quencher and an ultraviolet absorbent in a mass ratio of 1.7:1.4: 3.9.
Example 13: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: in step S2, the amount of tackifying resin added is 60% of the total amount, and in step S4, the amount of ethylene vinyl acetate copolymer added is 60% of the total amount.
Example 14: the adhesive for the adhesive tape of the disposable non-woven protective clothing is different from the adhesive tape of the embodiment 1 in that: in step S2, the amount of tackifying resin added was 42% of the total amount, and in step S4, the amount of ethylene vinyl acetate copolymer added was 67% of the total amount.
Example 15: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: in step S6, no ultrasonic wave is applied.
Example 16: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: in step S6, vacuum is not drawn.
Example 17: the adhesive for the adhesive tape of the disposable non-woven protective clothing is different from the adhesive tape of the embodiment 1 in that: in step S2, the heating temperature is 150 ℃, in step S4, the heating temperature is 150 ℃, in step S5, the heating temperature is 170 ℃, and the reaction time is 30 min.
Example 18: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: in step S7, the discharge temperature is 125 ℃, and the discharge port is pressurized to 0.05 MPa.
Example 19: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: step S6 is specifically as follows: the cross-linked mixed phase was allowed to react for a further 30min until a homogeneous phase was formed.
Example 20, a disposable non-woven protective clothing adhesive tape, differs from example 1 in that: in step S5, no nitrogen gas is introduced.
Comparative example 4: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive of the embodiment 1 in that: the processing is carried out by the following steps:
s1: preparing materials, namely weighing the materials in parts by weight;
s2: mixing a softening agent and tackifying resin, adding a fluorescent shielding agent and an antioxidant, heating to 145 ℃ to melt the materials, and uniformly stirring to obtain a first mixed phase;
s3: weighing styrene thermoplastic elastomer and glass fiber, mixing and mixing, and adding into the first mixed phase to obtain a second mixed phase;
s4: mixing the second mixed phase, adding ethylene-vinyl acetate copolymer, uniformly mixing, heating to 170 ℃, introducing nitrogen, keeping for 5min, vacuumizing, applying 20kHz ultrasonic wave, and stirring for 25 min; obtaining a cross-linked mixed phase;
s5: stopping stirring, and discharging after the crosslinked mixed phase is stable; the temperature of the discharge port is kept at 135 ℃, and the discharge port is pressurized to 0.1MPa during discharging;
s6: filtering, cooling and packaging.
Comparative example 5: the adhesive for the disposable non-woven protective clothing adhesive tape is different from the adhesive for the comparative example 4 in that the steps S2-4 are replaced by the step S2': the materials were mixed and heated to 170 ℃ and nitrogen was introduced, stirred for 10min, then evacuated and subjected to ultrasonic wave application at 20kHz, stirred for 25min to obtain a crosslinked mixed phase.
Comparative example 6: is full of N 2 2 parts by weight of zinc N, N-dibutylaminodithiocarbamate, 35 parts by weight of mineral oil and 90 parts by weight of petroleum resin are melted and mixed for 20 minutes at the temperature of 120 ℃, then 80 parts by weight of linear SIS resin is gradually added and melted and mixed for 20 minutes, and the prepared SIS hot melt pressure sensitive adhesive is cooled to the temperature of 60 ℃.
The following experiments were conducted for the above examples and comparative examples.
1. And (3) measuring the bonding strength: the test samples were respectively smeared on 10 square BOPP labels with a side length of 3cm, with a glue line thickness of 0.4 mm. Another square non-woven fabric with the side length of 5cm is taken, and the thickness of the non-woven fabric is 1 mm. And (3) attaching the label to the surface of the non-woven fabric, keeping the label in a dark state at 20 ℃, controlling the humidity to be 40%, standing for 6 hours, measuring the tension required when the label is separated from the non-woven fabric, and taking an average value. The results of this experiment on the samples of the respective comparative examples and examples are shown in Table 2.
The above data show that the separation tensile values of the examples are higher in all of examples 1 to 20. Whereas in the comparative examples, only the separation pull values in comparative examples 4 and 5 exceeded 60N.
2. And (3) weather resistance test: the test samples were respectively smeared on 10 square BOPP labels with a side length of 3cm, with a glue line thickness of 0.4 mm. Another square non-woven fabric with the side length of 5cm is taken, and the thickness of the non-woven fabric is 1 mm. Attaching the label to the surface of the non-woven fabric, placing an ultraviolet lamp with the power of 30W at the position 1m away from the sample at the temperature of 20 ℃, controlling the humidity to be 40%, irradiating for 3h, then measuring the tensile force required when the label is separated from the non-woven fabric, and taking an average value. The results of this experiment on the samples of the respective comparative examples and examples are shown in Table 3.
From the above data, it can be seen that most samples have reduced tensile force values required for separation after UV irradiation. In examples 9 to 12, the tensile force required for separation was significantly changed after the ultraviolet treatment.
3. Moisture environment resistance test: the test samples were respectively smeared on 10 square BOPP labels with a side length of 3cm, with a glue line thickness of 0.4 mm. Another square non-woven fabric with the side length of 5cm is taken, and the thickness of the non-woven fabric is 1 mm. And (3) attaching the label to the surface of the non-woven fabric, placing the attached sample in a dark condition at 20 ℃, controlling the humidity to be 80%, keeping for 6h, taking out and measuring the tensile force required when the label is separated from the non-woven fabric, and taking an average value. The results of this experiment on the samples of the respective comparative examples and examples are shown in Table 4.
As can be seen from the data in the table, the separation tension value of the sample without glass fiber is obviously reduced after the sample is placed in a high humidity environment for a certain time. After the sample containing the glass fiber is placed in a high humidity environment for a period of time, the separation tension value is reduced but the reduction amplitude is smaller.
4. Sample morphology: and observing whether the fluidity of the sample in the processing process and the shape of the sample after the processing are uniform or not. The observation results are shown in table 5.
In the above list, most of the examples and comparative examples have uniform overall morphology, but examples 7, 15, 16, 2, 4 and 5 have some degree of non-uniformity.
The examples and comparative examples were analyzed with respect to the above experimental results as follows:
in the examples 1 to 4, only the mixture ratio of the materials is changed to a certain degree, and in the examples 13 to 14 and the examples 17 to 18, part of the process parameters are adjusted, so that compared with the comparative example 6 in the prior art, the adhesive has stronger bonding capability and good weather resistance, and the adhesive can maintain stronger bonding capability under the condition of high humidity.
Example 6 glass fibers having a longer length were used as compared to example 1. When glass fiber length is longer, can form even and the arrangement structure that is parallel to each other in the hot melt adhesive to can lead to the hot melt adhesive rigidity increase when the coating, the pliability variation, and then lead to the glue film to ftracture easily, or be difficult to closely laminate in the surface of non-woven fabrics layer, thereby can lead to the cohesive strength decline of hot melt adhesive.
Comparative example 1, which contains no glass fiber, shows a significant decrease in adhesion after use for a certain period of time in a high humidity environment, demonstrating that glass fiber can play an excellent waterproof role in hot melt adhesives. In the comparative example 2, the content of the glass fiber is too high, the glass fiber can be separated out in the processing process, the structure of the hot melt adhesive is not uniform, and the bonding strength is further reduced. The comparative example 3 has a low content of glass fiber, and is also inferior in reinforcing effect of bonding strength and resistance to high humidity environment.
In example 7, liquid paraffin was selected as the softening agent, and the liquid paraffin had poor melting property and general fluidity, and it was difficult to stir the system uniformly during the reaction. The unhydrogenated C5 petroleum resin selected in example 8 is easily oxidized in air due to a large amount of double bonds contained in the unhydrogenated C5 petroleum resin, resulting in a decrease in the weather resistance of the hot melt adhesive.
In example 5 and examples 9 to 12, the fluorescent screening agent and the different antioxidants were absent, and the adhesive strength was significantly reduced after the ultraviolet irradiation. Therefore, the fluorescent shielding agent, the free radical quenching agent, the peroxide quenching agent, the superoxide quenching agent and the ultraviolet absorbent need to be cooperated to play a role in improving the weather resistance of the hot melt adhesive.
In embodiment 15, in step S6, the ultrasonic defoaming treatment is not performed, and the viscosity of the hot melt adhesive is too high, so that the generated bubbles are retained in the hot melt adhesive, and the uniformity of the hot melt adhesive is deteriorated. And the ultrasonic waves have the effect of improving the polymer winding effect between the hot melt adhesives, so the overall bonding capability of the adhesive layer of embodiment 15 is poor. In example 16, in step S6, no vacuum treatment was performed, and only ultrasonic waves were applied, so that air bubbles therein were still difficult to be discharged from the hot melt adhesive, and there was also a problem that the hot melt adhesive system was not uniform and the adhesive ability was deteriorated. In example 19, neither vacuum treatment nor ultrasonic wave application was used, and this problem was further amplified, resulting in a great decrease in bonding ability. In example 20, no nitrogen gas was introduced in step 5, which easily caused the air oxidation of the hot melt adhesive during the manufacturing process, and further caused the deterioration of the hot melt adhesive. Meanwhile, the applicant also finds that the nitrogen is introduced to facilitate the components to be mixed more uniformly, and the formed small nitrogen bubbles can enable the glass fibers to form a relatively orderly arrangement mode, so that the bonding capacity and the adaptability of the hot melt adhesive under high humidity are further improved. In comparative example 4, the ethylene-vinyl acetate copolymer and the tackifying resin were added to the system at one time, which resulted in excessive viscosity and poor fluidity of the system during the stirring process, and further failed to sufficiently and uniformly mix the hot melt adhesive during the stirring process. In comparative example 5, all the raw materials were added together and stirred together, further worsening the problem, leading to a decrease in both the adhesive ability and uniformity of the hot melt adhesive, and a decrease in the fluidity during processing.
In conclusion, the technical scheme provided by the invention can effectively improve the bonding capability of the hot melt adhesive and the capability of keeping the high bonding capability of the hot melt adhesive under the high humidity condition.
The protection scope of the invention is as follows: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (3)
1. The utility model provides a disposable non-woven fabrics protective clothing is glue for sticky tape which characterized in that: the adhesive comprises the following components in parts by mass:
17-19 parts of a styrene thermoplastic elastomer;
0.6-1.3 parts of an antioxidant;
8-10 parts of a softener;
20-35 parts of tackifying resin;
1.1-2.6 parts of glass fiber;
adding ethylene-vinyl acetate copolymer to 100 parts; the length of the glass fiber is not more than 0.2 mm; the fluorescent screening agent also comprises 0.5-1 part of fluorescent screening agent; the antioxidant consists of a free radical quencher, a peroxide quencher, a superoxide anion quencher and an ultraviolet absorbent; the softening agent is microcrystalline wax; the tackifying resin is hydrogenated C5 petroleum resin; a preparation method of adhesive for disposable non-woven protective clothing adhesive tape comprises the following steps:
s1: preparing materials, namely weighing ethylene-vinyl acetate copolymer, styrene thermoplastic elastomer, glass fiber, antioxidant, softener, tackifying resin and fluorescent shielding agent in parts by weight;
s2: mixing all the softening agents and 42-60% by mass of tackifying resin, heating to 145-150 ℃, and melting and uniformly mixing the materials to obtain a first mixed phase;
s3: adding a styrene thermoplastic elastomer and glass fibers into the first mixed phase to obtain a second mixed phase;
s4: adding the rest tackifying resin, all the fluorescent shielding agent and the antioxidant into the second mixed phase, adding an ethylene-vinyl acetate copolymer accounting for 50-67% of the total mass, heating to 140-150 ℃, melting and uniformly mixing to obtain a third mixed phase;
s5: adding the rest of the ethylene-vinyl acetate copolymer into the third mixed phase, uniformly mixing, heating to 160-170 ℃, introducing nitrogen, and keeping for 3-10 min to obtain a cross-linked mixed phase;
s6: vacuumizing the crosslinked mixed phase to-0.1 MPa, keeping the pressure for 10-20 min, and continuing to react until a homogeneous phase is formed;
s7: discharging after the product is stable;
s8: filtering, cooling and packaging.
2. The preparation method of the adhesive for the disposable non-woven protective clothing adhesive tape according to claim 1, characterized by comprising the following steps: in step S6, the reaction system is vacuumized and applied with ultrasonic waves for 25-30 min.
3. The preparation method of the adhesive for the disposable non-woven protective clothing adhesive tape according to claim 2, characterized by comprising the following steps: in step S7, the discharge temperature is 125-135 ℃, and the discharge port is pressurized to 0.05-0.1 Mpa during discharge.
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| CN113372858A (en) * | 2021-07-12 | 2021-09-10 | 浙江精华科技有限公司 | Medical hot-melt pressure-sensitive adhesive for magnetic therapy patch and preparation method thereof |
| CN114292623A (en) * | 2021-12-09 | 2022-04-08 | 鑫序高分子材料(苏州)有限公司 | Method for manufacturing clothes through high-resilience thermoplastic elastomer adhesive film |
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