CN116083015A - EVA hot melt adhesive preparation method suitable for air conditioner evaporator - Google Patents
EVA hot melt adhesive preparation method suitable for air conditioner evaporator Download PDFInfo
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- CN116083015A CN116083015A CN202310129363.4A CN202310129363A CN116083015A CN 116083015 A CN116083015 A CN 116083015A CN 202310129363 A CN202310129363 A CN 202310129363A CN 116083015 A CN116083015 A CN 116083015A
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- reaction kettle
- styrene
- hot melt
- melt adhesive
- air conditioner
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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
- C09J157/00—Adhesives based on unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09J157/02—Copolymers of mineral oil hydrocarbons
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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
- C09J193/00—Adhesives based on natural resins; Adhesives based on derivatives thereof
- C09J193/04—Rosin
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention relates to a preparation method of EVA hot melt adhesive suitable for an air conditioner evaporator, which is characterized by comprising a reaction kettle and the following raw material components in parts by mass: wax: 5-10 parts of ethylene-vinyl acetate copolymer, 25-35 parts of styrene-isoprene-styrene resin: 5-10 parts of tackifying resin: 50-55 parts; viscosity and antioxidant increase: 0-0.5 part of EVA hot melt adhesive suitable for an air conditioner evaporator, provided by the invention, has the advantages of high temperature resistance, low temperature resistance after solidification, less influence of weather, and no decrease of viscosity in cold weather environment.
Description
Technical Field
The invention relates to the technical field of hot melt adhesive manufacture, in particular to a preparation method of EVA hot melt adhesive suitable for an air conditioner evaporator.
Background
The EVA hot melt adhesive is a plastic adhesive, is in a solid state at normal temperature, can be quickly bonded after being heated and melted, has high adhesive force, has certain flexibility and hardness as well as certain toughness due to solidification, is widely applied to the fields of mechanical packaging, non-woven fabric manufacturing, furniture manufacturing, wireless binding, electronic element bonding, daily necessities bonding and the like, and becomes the most widely applied type of hot melt adhesive.
The air conditioner evaporator is used for utilizing liquid low-temperature refrigerant to be easily evaporated under low pressure, converted into steam and absorbing heat of a cooled medium so as to achieve the aim of refrigeration. In the production process of the air conditioner evaporator, the evaporator is required to be cut and spliced due to the structure of the air conditioner indoor unit and in order to achieve the effect of cold and heat exchange, so that interfaces and cracks are generated. In order to achieve the best heat and cold exchange effect and moisture generated on the evaporator, the junction part needs to be sealed so that the moisture cannot be blown out from the cracks.
The existing interfaces and cracks for the air conditioner evaporator are generally sealed through sealing cement, and the following problems mainly occur: (1) the use of the sealing cement is greatly influenced by weather, and the viscosity of the sealing cement is obviously reduced in cold weather; (2) the use of the sealing cement can not make the embedding depth visual, so that the depth of the embedded fins can not be ensured; (3) other alternative materials such as sponge strips are carbonized under the influence of high temperature to generate peculiar smell, and after hardening, the materials generate condensation water, fracture and the like.
Therefore, further improvements are needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a preparation method of EVA hot melt adhesive suitable for an air conditioner evaporator, which aims to at least solve one of the technical problems in the prior art to a certain extent.
The purpose of the invention is realized in the following way:
the EVA hot melt adhesive preparation method suitable for the air conditioner evaporator comprises a reaction kettle and the following raw material components in parts by mass: wax: 5-10 parts of ethylene-vinyl acetate copolymer, 25-35 parts of styrene-isoprene-styrene resin: 5-10 parts of tackifying resin: 50-55 parts; viscosity and antioxidant increase: 0-0.5 part of raw material components, and the following steps are carried out.
Step one: the temperature of the reaction kettle is heated to 140-160 ℃.
Step two: sequentially adding the wax and the antioxidant into a reaction kettle, keeping the temperature at 140-160 ℃, and stirring for 25-35 min until the mixture of the wax and the antioxidant is completely melted.
Step three: the temperature of the reaction kettle is kept at 140-160 ℃, the reaction kettle is rotated and adjusted to 5r/min, and the styrene-isoprene-styrene resin is put into the reaction kettle and stirred for 50-70 min until the styrene-isoprene-styrene resin is completely swelled to be in a transparent and white-free small particle state.
Step four: maintaining the temperature of the reaction kettle at 140-160 ℃, rotating the reaction kettle to 30r/min, putting the ethylene-vinyl acetate copolymer into the reaction kettle, and continuously maintaining the temperature and stirring for 25-35 min until the ethylene-vinyl acetate copolymer is completely melted.
Step five: the temperature of the reaction kettle is reduced to 120-140 ℃, and the tackifying resin is put into the reaction kettle and stirred for 25-35 min at the maintained temperature until the tackifying resin is completely melted.
The wax is low molecular weight Fischer-Tropsch wax, and the melting point is above 100 ℃.
The ethylene-vinyl acetate copolymer is one or more of copolymers with vinyl acetate content of 18-40% and melt index parameter of 25-400.
The styrene-isoprene-styrene polymer has a styrene content of 29% and a diblock content of 0.
The tackifying resin is one or more of hydrogenated petroleum resin, carbon five petroleum resin and rosin resin.
The antioxidant is one or more of hindered phenol antioxidants and phosphite antioxidants.
The beneficial effects of the invention are as follows:
the EVA hot melt adhesive suitable for the air conditioner evaporator provided by the invention has the advantages that the EVA hot melt adhesive can resist high and low temperatures after solidification, is less influenced by weather, is not reduced in viscosity in cold weather, is transparent in a molten state, can be embedded into fins through visual observation, and ensures the adhesiveness with the fins, and in addition, the high-temperature carbonization temperature of the EVA hot melt adhesive suitable for the air conditioner evaporator provided by the invention needs to exceed 200 ℃, so that peculiar smell can not be generated due to high-temperature carbonization in a normal use process, and the conditions of dew generation and breakage can not be generated after hardening.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Detailed Description
The invention is further described below with reference to examples.
The EVA hot melt adhesive preparation method suitable for the air conditioner evaporator comprises a reaction kettle and the following raw material components in percentage by mass: wax: 5-10 parts of ethylene-vinyl acetate copolymer, 25-35 parts of styrene-isoprene-styrene resin: 5-10 parts of tackifying resin: 50-55 parts; viscosity and antioxidant increase: 0-0.5 part of raw material components, and the following steps are carried out.
Step one: the temperature of the reaction kettle is heated to 140-160 ℃.
Step two: sequentially adding the wax and the antioxidant into a reaction kettle, keeping the temperature at 140-160 ℃, and stirring for 25-35 min until the mixture of the wax and the antioxidant is completely melted.
Step three: the temperature of the reaction kettle is kept at 140-160 ℃, the reaction kettle is rotated and adjusted to 5r/min, and the styrene-isoprene-styrene resin is put into the reaction kettle and stirred for 50-70 min until the styrene-isoprene-styrene resin is completely swelled to be in a transparent and white-free small particle state.
Step four: maintaining the temperature of the reaction kettle at 140-160 ℃, rotating the reaction kettle to 30r/min, putting the ethylene-vinyl acetate copolymer into the reaction kettle, and continuously maintaining the temperature and stirring for 25-35 min until the ethylene-vinyl acetate copolymer is completely melted.
Step five: the temperature of the reaction kettle is reduced to 120-140 ℃, and the tackifying resin is put into the reaction kettle and stirred for 25-35 min at the maintained temperature until the tackifying resin is completely melted.
Further, the wax is a low molecular weight Fischer-Tropsch wax having a melting point of 100 ℃ or higher.
Further, the ethylene-vinyl acetate copolymer is one or more of copolymers having a vinyl acetate content of 18-40% and a melt index parameter of 25-400.
Further, the styrene-isoprene-styrene polymer had a styrene content of 29% and a diblock content of 0.
Further, the tackifying resin is one or more of hydrogenated petroleum resin, carbon five petroleum resin and rosin resin.
Further, the antioxidant is one or more of hindered phenol antioxidants and phosphite antioxidants.
The wax provided in this example is mainly used for controlling the curing speed and the opening time of the EVA hot melt adhesive, the ethylene-vinyl acetate copolymer and the tackifying resin are used for increasing the viscosity of the EVA hot melt adhesive, and the antioxidant is used for improving the yellowing resistance of the finished product.
In scheme 1, the raw material formulation used is as follows:
according to the raw material proportion and the composition in the table, the antioxidant and the wax are put into a reaction kettle, heated to 150 ℃ under normal pressure, and stirred for 30min until the mixture of the wax and the antioxidant is completely melted.
The ethylene-vinyl acetate copolymer is put into a reaction kettle and is evenly stirred for 30min at the normal pressure of 160 ℃ until being melted.
The tackifying resin is added into the reaction kettle in batches and evenly stirred for 20min at the normal pressure of 130 ℃ until the tackifying resin is melted.
And (3) sealing the reaction kettle after no obvious particles exist in the reaction kettle, vacuumizing at 160 ℃ (-0.06 MPa), discharging, cooling and granulating to obtain the hot melt adhesive.
In scheme 2, the raw material formulation used is as follows:
according to the raw material proportion and the composition in the table, the antioxidant and the wax are put into a reaction kettle, heated to 150 ℃ under normal pressure, and stirred for 30min until the mixture is completely melted.
The styrene-isoprene-styrene resin was put into a reaction kettle and stirred at 150℃under normal pressure for 50 minutes until the styrene-isoprene-styrene resin was completely swollen in a transparent and white-free small particle state.
The ethylene-vinyl acetate copolymer is put into a reaction kettle, melted at the normal pressure of 160 ℃ and evenly stirred for 30min.
The tackifying resin is added into the reaction kettle in batches and evenly stirred for 20min at the normal pressure of 130 ℃ until the tackifying resin is melted.
When no obvious particles exist in the reaction kettle, the reaction kettle is sealed at 160 DEG C
Vacuum pumping at minus 0.06 MPa), discharging, cooling and granulating to obtain the hot melt adhesive.
In scheme 3, the raw material formulation used is as follows:
according to the raw material proportion and the composition in the table, the antioxidant and the wax are put into a reaction kettle, heated to 150 ℃ under normal pressure, and stirred for 30min until the mixture is completely melted.
The ethylene-isoprene-styrene resin is put into a reaction kettle, melted at the normal pressure of 150 ℃ and evenly stirred for 50min.
The ethylene-vinyl acetate copolymer is put into a reaction kettle, melted at the normal pressure of 160 ℃ and evenly stirred for 30min.
The tackifying resin is added into the reaction kettle in batches and evenly stirred for 20min at the normal pressure of 130 ℃ until the tackifying resin is melted.
And (3) sealing the reaction kettle after no obvious particles exist in the reaction kettle, vacuumizing at 160 ℃ (-0.06 MPa), discharging, cooling and granulating to obtain the hot melt adhesive.
In scheme 4, the raw material formulation used is as follows:
according to the raw material proportion and the composition in the table, the antioxidant and the wax are put into a reaction kettle, heated to 150 ℃ under normal pressure, and stirred for 30min until the mixture is completely melted.
The ethylene-isoprene-styrene resin is put into a reaction kettle, melted at the normal pressure of 150 ℃ and evenly stirred for 50min.
The ethylene-vinyl acetate copolymer is put into a reaction kettle, melted at the normal pressure of 160 ℃ and evenly stirred for 30min.
The tackifying resin is added into the reaction kettle in batches and evenly stirred for 20min at the normal pressure of 130 ℃ until the tackifying resin is melted.
And (3) sealing the reaction kettle after no obvious particles exist in the reaction kettle, vacuumizing at 160 ℃ (-0.06 MPa), discharging, cooling and granulating to obtain the hot melt adhesive.
In practical example 5, the raw material formulation used is as follows:
according to the raw material proportion and the composition in the table, the antioxidant and the wax are put into a reaction kettle, heated to 150 ℃ under normal pressure, and stirred for 30min until the mixture is completely melted.
The ethylene-isoprene-styrene resin is put into a reaction kettle, melted at the normal pressure of 150 ℃ and evenly stirred for 50min.
The ethylene-vinyl acetate copolymer is put into a reaction kettle, melted at the normal pressure of 160 ℃ and evenly stirred for 30min.
The tackifying resin is added into the reaction kettle in batches and evenly stirred for 20min at the normal pressure of 130 ℃ until the tackifying resin is melted.
And (3) sealing the reaction kettle after no obvious particles exist in the reaction kettle, vacuumizing at 160 ℃ (-0.06 MPa), discharging, cooling and granulating to obtain the hot melt adhesive.
In scheme 6, the raw material formulation used is as follows:
according to the raw material proportion and the composition in the table, the antioxidant and the wax are put into a reaction kettle, heated to 150 ℃ under normal pressure, and stirred for 30min until the mixture is completely melted.
The ethylene-isoprene-styrene resin is put into a reaction kettle, melted at the normal pressure of 150 ℃ and evenly stirred for 50min.
The ethylene-vinyl acetate copolymer is put into a reaction kettle, melted at the normal pressure of 160 ℃ and evenly stirred for 30min.
The tackifying resin is added into the reaction kettle in batches and evenly stirred for 20min at the normal pressure of 130 ℃ until the tackifying resin is melted.
And (3) sealing the reaction kettle after no obvious particles exist in the reaction kettle, vacuumizing at 160 ℃ (-0.06 MPa), discharging, cooling and granulating to obtain the hot melt adhesive.
Performance testing
The EVA hot melt adhesive prepared by the schemes 1-6 is respectively subjected to adhesive property, horizontal tensile test, high temperature resistance and low temperature resistance test by the EVA hot melt adhesive sold by a certain company in China (the number is a control group 0).
And (3) adhesive property test: the adhesion performance was judged by observing the force value required after peeling off the bonded substrate.
And (3) tensile force test: the bonded substrate was placed in a chest expander test.
High and low temperature resistance test: and (3) placing the bonded base material at 60 ℃ for 2 hours, then cooling to-20 ℃, wherein 2H is one cycle, and repeatedly observing whether the base material is naturally adhesive-opened or not for 6 times.
The EVA hot melt adhesives prepared in the schemes 1-6 pass the adhesive property test, and other test results are shown in the following table:
| project | Force value (N) | Temperature resistance |
| Scheme 1 | 100 | There is no adhesive spreading |
| Scheme 2 | 50 | There is no adhesive spreading |
| Scheme 3 | 230 | There is no adhesive spreading |
| Scheme 4 | 290 | There is no adhesive spreading |
| Scheme 5 | 360 | There is no adhesive spreading |
| Scheme 6 | 400 | There is no adhesive spreading |
| Control group 0 | 180 | Micro-opening glue |
Note that: the force value refers to the adhesive property determined by comparing the force value required after the bonded substrate is peeled off.
The above examples are only preferred embodiments of the invention, and other embodiments of the invention are possible. Equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the invention, and these equivalent modifications or substitutions are intended to be included within the scope of the present claims.
Claims (6)
1. The EVA hot melt adhesive preparation method suitable for the air conditioner evaporator is characterized by comprising a reaction kettle and the following raw material components in parts by mass: wax: 5-10 parts of ethylene-vinyl acetate copolymer, 25-35 parts of styrene-isoprene-styrene resin: 5-10 parts of tackifying resin: 50-55 parts; viscosity and antioxidant increase: 0-0.5 part of raw material components, wherein the raw material components comprise the following steps:
step one: heating the reaction kettle to 140-160 ℃;
step two: sequentially adding the wax and the antioxidant into a reaction kettle, keeping the temperature at 140-160 ℃, and stirring for 25-35 min until the mixture of the wax and the antioxidant is completely melted;
step three: maintaining the temperature of the reaction kettle at 140-160 ℃, rotating the reaction kettle to 5r/min, putting the styrene-isoprene-styrene resin into the reaction kettle, and stirring for 50-70 min until the styrene-isoprene-styrene resin is completely swelled to be in a transparent and white-free small particle state;
step four: maintaining the temperature of the reaction kettle at 140-160 ℃, rotating the reaction kettle to 30r/min, putting the ethylene-vinyl acetate copolymer into the reaction kettle, and continuously maintaining the temperature and stirring for 25-35 min until the ethylene-vinyl acetate copolymer is completely melted;
step five: the temperature of the reaction kettle is reduced to 120-140 ℃, and the tackifying resin is put into the reaction kettle and stirred for 25-35 min at the maintained temperature until the tackifying resin is completely melted.
2. The method for preparing the EVA hot melt adhesive applicable to the air conditioner evaporator according to claim 1, wherein the method comprises the following steps of: the wax is low molecular weight Fischer-Tropsch wax, and the melting point is above 100 ℃.
3. The method for preparing the EVA hot melt adhesive applicable to the air conditioner evaporator according to claim 1, wherein the method comprises the following steps of: the ethylene-vinyl acetate copolymer is one or more of copolymers with vinyl acetate content of 18-40% and melt index parameter of 25-400.
4. The method for preparing the EVA hot melt adhesive applicable to the air conditioner evaporator according to claim 1, wherein the method comprises the following steps of: the styrene-isoprene-styrene polymer has a styrene content of 29% and a diblock content of 0.
5. The method for preparing the EVA hot melt adhesive applicable to the air conditioner evaporator according to claim 1, wherein the method comprises the following steps of: the tackifying resin is one or more of hydrogenated petroleum resin, carbon five petroleum resin and rosin resin.
6. The method for preparing the EVA hot melt adhesive applicable to the air conditioner evaporator according to claim 1, wherein the method comprises the following steps of: the antioxidant is one or more of hindered phenol antioxidants and phosphite antioxidants.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310129363.4A CN116083015A (en) | 2023-02-17 | 2023-02-17 | EVA hot melt adhesive preparation method suitable for air conditioner evaporator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310129363.4A CN116083015A (en) | 2023-02-17 | 2023-02-17 | EVA hot melt adhesive preparation method suitable for air conditioner evaporator |
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| CN116083015A true CN116083015A (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310129363.4A Pending CN116083015A (en) | 2023-02-17 | 2023-02-17 | EVA hot melt adhesive preparation method suitable for air conditioner evaporator |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996003470A1 (en) * | 1994-07-26 | 1996-02-08 | Exxon Chemical Patents Inc. | Hot melt adhesive based on eva and styrene block polymers |
| CN110157354A (en) * | 2018-03-26 | 2019-08-23 | 广州市伟旺热熔胶科技有限公司 | A kind of modified EVA hot-melt adhesive and preparation method thereof |
| CN114262586A (en) * | 2022-01-13 | 2022-04-01 | 重庆小师傅新材料有限公司 | Antibacterial EVA edge sealing hot melt adhesive material and preparation method thereof |
-
2023
- 2023-02-17 CN CN202310129363.4A patent/CN116083015A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996003470A1 (en) * | 1994-07-26 | 1996-02-08 | Exxon Chemical Patents Inc. | Hot melt adhesive based on eva and styrene block polymers |
| CN110157354A (en) * | 2018-03-26 | 2019-08-23 | 广州市伟旺热熔胶科技有限公司 | A kind of modified EVA hot-melt adhesive and preparation method thereof |
| CN114262586A (en) * | 2022-01-13 | 2022-04-01 | 重庆小师傅新材料有限公司 | Antibacterial EVA edge sealing hot melt adhesive material and preparation method thereof |
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