CN107868630B - Adhesive resin with barrier function and preparation method thereof - Google Patents
Adhesive resin with barrier function and preparation method thereof Download PDFInfo
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- CN107868630B CN107868630B CN201710836654.1A CN201710836654A CN107868630B CN 107868630 B CN107868630 B CN 107868630B CN 201710836654 A CN201710836654 A CN 201710836654A CN 107868630 B CN107868630 B CN 107868630B
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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
- C09J123/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C09J123/0815—Copolymers of ethene with aliphatic 1-olefins
-
- 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
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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
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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
- C08L2201/14—Gas barrier composition
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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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Abstract
the invention discloses a bonding resin with barrier function and a preparation method thereof, wherein the raw material formula comprises the following components in percentage by weight: 20 to 60 percent of Linear Low Density Polyethylene (LLDPE), 10 to 30 percent of polyethylene graft master batch, 5 to 40 percent of ethylene-vinyl alcohol copolymer, 10 to 30 percent of polyolefin elastomer and 0.08 to 0.2 percent of antioxidant, and the material is prepared by adopting a double-screw extruder to implement a plasticizing and blending process to extrude and granulate. The adhesive resin disclosed by the invention has good adhesive property, processability and barrier property, is not only suitable for an adhesive layer of a multilayer automobile plastic fuel tank, but also can be used in the field of composite materials such as multilayer plastic composite hoses, multilayer plastic oxygen-blocking pipes and the like.
Description
Technical Field
The invention belongs to the field of high-molecular functional materials, relates to the technical field of hot melt adhesives, and particularly relates to a bonding resin with a barrier function and a preparation method thereof.
Background
Ethylene vinyl alcohol copolymer (EVOH) is a crystalline polymer of chain structure, has excellent barrier properties against gas, and is known as three major barrier resins in the world together with Polyamide (PA) and polyvinylidene chloride (PVDC). EVOH has gas barrier properties 10000 times that of polyethylene, 100 times that of PA, and 40 times that of PVDC. However, EVOH also has some performance defects, namely, under the condition of higher humidity, the barrier property is reduced, the hygroscopicity is high, and compared with common thermoplastic plastics, namely polypropylene PP and polyethylene PE, the processability is poor and the toughness is poor. Therefore, at present, EVOH and polyolefin (PP, PE) with excellent moisture insulation performance are mainly used for manufacturing the barrier composite packaging material by a multi-layer co-extrusion or layered blending method.
The polyethylene has excellent physical and mechanical properties and processability, and is widely applied. The polyethylene adhesive resin (i.e. hot melt adhesive) is prepared by endowing common polyethylene with polar functional groups through chemical grafting, melt blending and the like, so that the polyethylene adhesive resin has strong adhesive property and can be tightly adhered with other materials. The polyethylene adhesive resin is used as an intermediate adhesive layer, so that common polyethylene can be tightly adhered with materials such as EVOH, PA, wood, metal and the like, and a plurality of composite materials can be prepared.
At present, the typical six-layer structure of the plastic fuel tank of the automobile is as follows: high density polyethylene HDPE (inner layer)/tie layer/EVOH barrier layer/tie layer/regrind layer/pigmented HDPE (outer layer). Multilayer coextruded plastic composite hoses also have a similar structure: polyethylene PE (print layer)/adhesive layer/EVOH barrier layer/adhesive layer/polyethylene PE (heat seal layer). The barrier composite material with such a structure has a barrier effect on oxygen and air mainly by the middle barrier layer, and the adhesive layer is generally made of maleic anhydride graft modified polyethylene adhesive resin.
Since the polyethylene bonding resin does not have barrier property, the effect of the small molecules and the organic molecules can affect the bonding effect of the bonding layer and further affect the barrier effect of the barrier product along with the passage of time. Therefore, how to improve the barrier performance of polyethylene adhesive resins while maintaining the adhesive performance is currently a significant research topic.
Chinese patent (publication No. CN 102134467A) describes a preparation method of a nanometer barrier hot melt adhesive, which is prepared by adding a certain amount of organic modified layered nanometer silicate into polyolefin to prepare a nanometer polyolefin material, and then carrying out melt reaction on tackifying resin, a monomer and an initiator and the nanometer polyolefin material through a double screw extruder to carry out in-situ grafting. Chinese patent (publication No. CN 103173167A) describes a preparation method of a hot melt adhesive for a multilayer oil tank, which is to prepare polyolefin graft polymers from polyethylene, polypropylene, monomers, an initiator and a polyolefin nucleating agent through a double-screw extruder, and then prepare the polyolefin graft polymers and the polyethylene into the hot melt adhesive for the multilayer oil tank through a double-screw extruder. None of the above patents, however, mention the use of barrier resins, EVOH, primarily in melt blending with polyethylene systems to improve the barrier properties of polyolefin tie resins.
disclosure of Invention
The invention aims to provide bonding resin with a barrier function and a preparation method thereof, and the bonding resin prepared by the method has good bonding performance, processability and barrier performance, is not only suitable for a bonding layer of a multilayer automobile plastic fuel tank, but also can be used in the field of composite materials such as multilayer plastic composite hoses, multilayer plastic oxygen-blocking pipes and the like.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
The bonding resin with the barrier function comprises the following raw materials in percentage by weight: 20 to 60 percent of Linear Low Density Polyethylene (LLDPE), 5 to 40 percent of ethylene-vinyl alcohol copolymer (EVOH), 10 to 30 percent of polyethylene graft master batch, 10 to 30 percent of polyolefin elastomer and 0.08 to 0.2 percent of antioxidant.
in order to fully ensure good bonding performance, processing performance and barrier performance, the raw material formula of the bonding resin with the barrier function is preferably (the following weight percentage content): 30-40wt% of Linear Low Density Polyethylene (LLDPE), 15-25wt% of ethylene-vinyl alcohol copolymer (EVOH), 20-30wt% of polyethylene graft master batch, 15-20wt% of polyolefin elastomer and 0.08-0.2% of antioxidant.
The preparation method of the bonding resin with the barrier function comprises the steps of extruding and granulating the components of the raw material formula according to the proportion by adopting a double-screw extruder to implement a plasticizing and blending process.
In the preparation method of the bonding resin with the barrier function, the linear low-density polyethylene is a copolymer of ethylene and alpha-olefin, and the density is 0.90-0.93g/cm3The melt index is 1-5g/10min (210 ℃/2.16 Kg).
In the preparation method of the bonding resin with the barrier function, the ethylene mol content of the linear ethylene-vinyl alcohol copolymer (EVOH) is 25-45 percent, and the density is 1.12-1.22g/cm3The melt index is 3-10g/10min (210 ℃/2.16 Kg).
the preparation method of the bonding resin with the barrier function comprises the following steps: the polyethylene is prepared by fully and uniformly mixing 75-95 wt% of High Density Polyethylene (HDPE), 5-25wt% of Linear Low Density Polyethylene (LLDPE), 0.8-1.5 wt% of graft modification monomer maleic anhydride and 0.02-0.1 wt% of initiator 2, 5-dimethyl-2, 5-di (tert-butyl peroxide) hexane and granulating by a double screw extruder. Wherein the HDPE is selected from the group consisting of HDPE having a density of 0.94-0.96g/cm3Melt index 5-10g/10 min; the LLDPE is selected from the group consisting of density 0.90-0.93g/cm3Melt index of 15-25g/cm3。
The preparation method of the polyethylene grafted master batch is characterized by comprising the following steps: the length-diameter ratio L/D of the double-screw extruder is more than or equal to 40:1 and less than or equal to 48:1, the rotating speed of the screw is controlled to be 300-400RPM, and the temperature of each temperature zone and the temperature of the machine head are set to be 80-230 ℃.
In the preparation method of the bonding resin with the barrier function, the polyolefin elastomer is a vinyl elastomer and has the density of 0.87-0.91g/cm3The melt index is 1-5g/10 min.
in the preparation method of the bonding resin with the barrier function, the antioxidant is a mixture of a multi-component hindered phenol main antioxidant and an organic phosphite auxiliary antioxidant, and preferably a synergistic mixture of the main antioxidant 1010 and the auxiliary antioxidant 168.
The components of the formula are added into a double-screw extruder to carry out plasticizing blending process for extrusion granulation, the length-diameter ratio of the double-screw extruder is more than or equal to 40:1 and less than or equal to L/D and less than or equal to 52:1, the rotating speed of the screw is controlled to be 300-400RPM, and the temperature of each temperature zone and the temperature of a machine head are set to be 120-240 ℃.
By means of the technical scheme, the invention has the beneficial effects that:
According to the invention, by utilizing the characteristics and advantages of the EVOH and the polyethylene material to complement each other, adopting a proper material proportion and utilizing the reaction grafting and melt blending technologies, the barrier property of the common polyolefin adhesive resin is improved, under the material components and the proportion thereof, the EVOH and the polyethylene material have excellent compatibility after melt blending, and after a proper amount of EVOH is introduced into the existing polyethylene adhesive resin system, the bulk strength and the heat resistance of the adhesive resin are enhanced, and according to the principle of similar compatibility, the interface fusion in the compounding process of the adhesive resin and the barrier layer EVOH can be promoted, so that the interface adhesive strength is improved. The adhesive resin disclosed by the invention has good adhesive property, processability and barrier property, is not only suitable for an adhesive layer of a multilayer automobile plastic fuel tank, but also can be used in the field of composite materials such as multilayer plastic composite hoses, multilayer plastic oxygen-blocking pipes and the like.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.
in the following examples, the linear low density polyethylene is a copolymer of ethylene and an a-olefin having a density of 0.91g/cm3The melt index was 4g/10min (210 ℃/2.16 Kg), (EVOH) had an ethylene molar content of 40%, and the density was 1.2g/cm3The melt index is 8g/10min (210 ℃/2.16 Kg), and the raw material formula (the following proportion is weight percentage content) of the polyolefin grafting master batch is as follows: 82 percent of High Density Polyethylene (HDPE), 18 percent of Linear Low Density Polyethylene (LLDPE), 1.0 percent of maleic anhydride and 0.03 percent of 2, 5-dimethyl-2, 5-di (tert-butyl peroxide) hexane are fully and uniformly mixed and then granulated by a double screw extruder to prepare the polyethylene composition; the vinyl elastomer was an ethylene-octene copolymer having a density of 0.88g/cm3The melt index was 2g/10 min.
In the following examples, the performance tests were obtained according to the same national standard test.
Example 1
The adhesive resin composition with the barrier function comprises the following raw materials in percentage by weight:
45% Linear Low Density Polyethylene (LLDPE)
15% ethylene vinyl alcohol copolymer (EVOH)
22% polyethylene graft masterbatch
18% polyolefin elastomer
0.13% of antioxidant
Example 2
The adhesive resin composition with the barrier function comprises the following raw materials in percentage by weight:
38% Linear Low Density Polyethylene (LLDPE)
18% ethylene vinyl alcohol copolymer (EVOH)
25% polyethylene graft masterbatch
19% polyolefin elastomer
0.15% of antioxidant
Example 3
The adhesive resin composition with the barrier function comprises the following raw materials in percentage by weight:
32% Linear Low Density Polyethylene (LLDPE)
21% ethylene vinyl alcohol copolymer (EVOH)
27% polyethylene graft masterbatch
20% polyolefin elastomer
0.16% of antioxidant
example 4
The adhesive resin composition with the barrier function comprises the following raw materials in percentage by weight:
30% Linear Low Density Polyethylene (LLDPE)
24% ethylene vinyl alcohol copolymer (EVOH)
26% polyethylene graft masterbatch
20% polyolefin elastomer
0.18% of antioxidant
The raw material formulas of the above examples 1 to 4 were added to a twin-screw extruder to carry out a plasticizing and blending process for extrusion granulation, and the adhesive resin with barrier function of the present invention was obtained.
Table 1 shows the basic properties of examples 1-4, including adhesion properties of EVOH and high density polyethylene (EVOH/adhesive resin/HDPE), oxygen barrier properties, tensile strength, heat distortion temperature, and melt index.
It can be seen from table 1 that the products of examples 1-4, especially example 2, have good oxygen barrier properties, good adhesion to EVOH and HDPE, excellent mechanical properties and thermal stability.
Claims (9)
1. The bonding resin with the barrier function comprises the following components in percentage by weight:
Linear Low Density Polyethylene (LLDPE)20-60 wt%
Ethylene-vinyl alcohol copolymer (EVOH)5-40 wt%
10-35 wt% of polyethylene graft master batch
10-30 wt% of polyolefin elastomer
0.08-0.2 wt% of antioxidant
The components are uniformly mixed by a high-speed stirrer and then prepared by a double-screw extruder;
The preparation method of the polyethylene grafting master batch comprises the following steps: the high-density polyethylene (HDPE) with the weight percentage content of 75-95%, the linear low-density polyethylene (LLDPE) with the weight percentage content of 5-25%, the graft modification monomer maleic anhydride with the weight percentage content of 0.8-1.5%, and the initiator 2, 5-dimethyl-2, 5-di (tert-butyl peroxide) hexane with the weight percentage content of 0.02-0.1 are fully and evenly mixed by a high-speed mixer and then granulated by a double-screw extruder; wherein the HDPE density is 0.94-0.96g/cm3The melt index is 5-10g/10 min; LLDPE density of 0.90-0.93g/cm3The melt index is 15-25g/cm3。
2. The bonding resin with the barrier function as claimed in claim 1, wherein the formulation comprises the following components in percentage by weight:
Linear Low Density Polyethylene (LLDPE)30-40 wt%
Ethylene-vinyl alcohol copolymer (EVOH)15-25 wt%
Polyethylene graft masterbatch 20-30wt%
15-20wt% of polyolefin elastomer
0.08-0.2 wt% of antioxidant.
3. The bonding resin with barrier function according to claim 1, wherein the linear low density polyethylene is a copolymer of ethylene and a-olefin, and the density is 0.90-0.93g/cm3The melt index is 1-5g/10 min.
4. The bonding resin with barrier function according to claim 1, wherein the linear ethylene-vinyl alcohol copolymer (EVOH) has an ethylene molar content of 25-45% and a density of 1.12-1.22g/cm3The melt index of 210 ℃/2.16Kg is 3-10g/10 min.
5. The bonding resin with the barrier function as claimed in claim 1, wherein the length/diameter ratio of the twin-screw extruder is 40:1 to 48:1, the screw rotation speed is controlled to 300-400RPM, and the temperature of each temperature zone and the head is set to 80-230 ℃.
6. the bonding resin having a barrier function according to claim 1, wherein: the polyolefin elastomer is a vinyl elastomer and has a density of 0.87-0.91g/cm3The melt index is 1-5g/10 min.
7. The bonding resin having a barrier function according to claim 1, wherein: the antioxidant is a mixture of a multi-element hindered phenol main antioxidant and an organic phosphite ester auxiliary antioxidant.
8. The bonding resin having a barrier function according to claim 7, wherein: the antioxidant is a mixture of a primary antioxidant 1010 and a secondary antioxidant 168.
9. The method for preparing the bonding resin with the barrier function as claimed in any one of claims 1 to 8, wherein a double screw extruder is used to perform the plasticizing blending process to extrude and granulate, the length-diameter ratio of the double screw extruder is 40:1 and L/D is 52:1, the rotating speed of the screw is controlled to 300-400RPM, and the temperature of each temperature zone and the temperature of the head are set to 120-240 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111100365B (en) * | 2018-10-26 | 2022-07-12 | 中国石油化工股份有限公司 | Polyethylene composition, preparation method thereof and extrusion molding packaging product |
| CN109880551A (en) * | 2019-03-05 | 2019-06-14 | 广东聚益新材有限公司 | Without aldehyde fire-resistant binder and its preparation method and application, board-like material |
| CN111452163A (en) * | 2020-03-17 | 2020-07-28 | 广州傲胜人造草股份有限公司 | Coated cork granule and preparation method thereof |
| CN112724893A (en) * | 2020-12-25 | 2021-04-30 | 上海邦中高分子材料股份有限公司 | Adhesive resin for barrier base material and preparation method thereof |
| CN112812708A (en) * | 2020-12-25 | 2021-05-18 | 上海邦中高分子材料股份有限公司 | Bonding resin for barrier type plastic hose and preparation method thereof |
| CN113861889B (en) * | 2021-09-18 | 2022-10-04 | 赣州能之光新材料有限公司 | Adhesive resin for high-barrier bottle and preparation method thereof |
| CN114103346B (en) * | 2021-10-28 | 2022-11-15 | 山东华致林医药科技有限公司 | Medicinal packaging material and preparation method thereof |
| CN114381221A (en) * | 2021-12-30 | 2022-04-22 | 上海邦中高分子材料股份有限公司 | Adhesive resin with barrier property and preparation method thereof |
| CN115534459A (en) * | 2022-10-12 | 2022-12-30 | 浙江周庆盖业有限公司 | Medicinal composite membrane and preparation method thereof |
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| US20080039583A1 (en) * | 2006-08-08 | 2008-02-14 | I-Hwa Lee | Adhesive composition |
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| CN1733397A (en) * | 2004-07-09 | 2006-02-15 | 朱春蕾 | Biaxial tension co-extrusion high-obstruct base material membrane and process for preparing the same |
| CN104356977A (en) * | 2014-11-27 | 2015-02-18 | 河源市普立隆新材料科技有限公司 | Preparation method of adhesive resin for multilayer coextruded plastic composite hose |
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