An adhesive resin, its preparation and use

Abstract

The present application relates to the technical field of high polymer material, and in particular to a kind of bonding resin and its preparation method and application.The bonding resin includes the following components by weight fraction:polyolefin grafting 10~35 parts, ultra-low density polyethylene 40~70 parts, ethylene-acrylic acid ester copolymer 10~30 parts, EVM rubber 3~20 parts and antioxidant 0.05~0.2 parts.The bonding resin has high-efficiency compounding speed relative to current market polyolefin bonding resin, which is characterized by low activation temperature and fast bonding speed, and no precipitate is generated when used downstream.The bonding resin has the advantages of high bonding strength and high cost performance relative to current market ethylene-acrylic acid copolymer (EAA) resin.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and more specifically, to an adhesive resin, its preparation method, and its application. Background Technology

[0002] Aluminum ceiling panels are widely used in interior building ceiling decoration. Their surfaces are often laminated with PET composite film using a lamination process to achieve aesthetic appeal, moisture resistance, and wear resistance. In the lamination process, the performance of the adhesive resin directly affects production efficiency, product quality, and cost. To reduce costs and improve production efficiency, the industry has imposed more stringent requirements on lamination processing: roll forming must be completed at a processing temperature of 105℃-110℃ and a lamination line speed of 20m / min. Low-temperature, high-speed production lines limit the application of certain adhesive resins.

[0003] Currently, commonly used adhesive resins include ethylene-acrylic acid copolymer (EAA) and conventional polyolefin modified adhesive resins. Although EAA has advantages such as fast low-temperature bonding speed, high bond strength, and good processability, it is mainly dependent on imports, resulting in high costs and significant supply chain risks. Existing adhesive resins for aluminum ceilings are prone to exudation and cannot meet the requirements for low-temperature, high-speed processing conditions and peel strength, thus failing to meet the requirements for low-temperature, rapid bonding of aluminum ceilings.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an adhesive resin, its preparation method, and its application. The adhesive resin has advantages such as low activation temperature, fast bonding speed, high bonding strength, low cost, and no exudates. It can be used for rapid bonding and high-efficiency production under low-temperature conditions, and there is no exudate during the preparation of the adhesive film, which meets the requirements of low-temperature, low-pressure, high-speed production lines for aluminum ceilings.

[0006] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

[0007] An adhesive resin, by weight, comprises the following components:

[0008] The composition includes 10-35 parts of polyolefin graft, 40-72 parts of ultra-low density polyethylene, 10-30 parts of ethylene-acrylate copolymer, 3-20 parts of EVM rubber, and 0.05-0.2 parts of antioxidant.

[0009] Preferably, the adhesive resin comprises, by weight, the following components:

[0010] The composition includes 15-30 parts of polyolefin graft, 45-65 parts of ultra-low density polyethylene, 15-25 parts of ethylene-acrylate copolymer, 5-15 parts of EVM rubber, and 0.1-0.15 parts of antioxidant.

[0011] Preferably, the melt index of the polyolefin graft is 0.5~50 g / 10 min.

[0012] Preferably, the grafting rate of the polyolefin graft is 0.5wt% to 2.8wt%.

[0013] Preferably, the matrix resin of the polyolefin graft comprises at least one of linear polyethylene, low-density polyethylene, ethylene-vinyl acetate copolymer, or polypropylene.

[0014] Preferably, the grafting monomers of the polyolefin graft include at least one of maleic acid, maleic anhydride, itaconic acid, acrylic acid, methacrylic acid, methyl methacrylate, glycidyl methacrylate, or styrene.

[0015] Preferably, the density of the ultra-low density polyethylene is 0.86~0.915 g / cm³. 3 The melt index is 0.5~50g / 10min, and the melting point is 100~120℃.

[0016] Preferably, the ethylene structural unit content of the ethylene-acrylate copolymer is 60wt% to 90wt%.

[0017] Preferably, the acrylate in the ethylene-acrylate copolymer includes at least one of ethyl acrylate, methacrylate, butyl acrylate, methyl acrylate, or 2-vinylhexyl acrylate.

[0018] Preferably, the EVM rubber comprises: ethylene-vinyl acetate copolymer, wherein the vinyl acetate content is 50wt%~90wt%.

[0019] A method for preparing the adhesive resin includes the following steps:

[0020] The raw materials are mixed and then extruded and granulated to obtain the adhesive resin.

[0021] Preferably, the extrusion is carried out in a twin-screw extruder, and the parameters of the twin-screw extruder are set as follows: zone 1 temperature is 80~100℃, zone 2 temperature is 100~140℃, zone 3 temperature is 120~160℃, zone 4 temperature is 130~210℃, zone 5 temperature is 130~210℃, zone 6 temperature is 130~210℃, zone 7 temperature is 130~210℃, zone 8 temperature is 130~200℃, and the die temperature is 130~200℃.

[0022] An adhesive film for aluminum ceilings comprises: the adhesive resin or an adhesive resin prepared by the method for preparing the adhesive resin.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] (1) The adhesive resin provided by this invention synergistically combines the components according to specific dosages, enabling each component to exert its unique function and produce a synergistic effect. Ultra-low density polyethylene provides the basis for low-temperature processing; EVM rubber and ethylene-acrylate copolymers form a polar synergistic system, jointly achieving rapid activation and efficient wetting at low temperatures; polyolefin grafts contribute core adhesive strength while acting as key compatibilizers, ensuring the system is uniform, stable, and free from exudation; antioxidants ensure processing and thermal stability. Ultimately, the resin can still achieve a peel strength of up to 48~59N / 25mm on aluminum materials under extreme process conditions of 105℃, 0.1MPa, and 20m / min, comprehensively meeting the full requirements of aluminum ceiling panels for low-temperature high-speed coating, high adhesive strength, no exudation, and high cost-effectiveness.

[0025] (2) The method for preparing adhesive resin provided by the present invention, through melt blending and reactive extrusion process, enables each component to achieve full dispersion, compatibility and microstructure construction under controlled shear and thermal field, ensuring that functional components such as polyolefin grafts, ethylene-acrylate copolymers and EVM rubber are evenly distributed and exert synergistic effects, thereby efficiently preparing resin particles with stable performance, no precipitation and excellent processability and high and low temperature adhesive strength in one step. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 The blown film precipitation is shown in the example.

[0028] Figure 2 This is a comparative example of blown film precipitation. Detailed Implementation

[0029] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0030] One aspect of the present invention relates to an adhesive resin, comprising, by weight, the following components:

[0031] 10-35 parts of polyolefin graft (e.g., any point value or range between any two of 10, 15, 20, 25, 30, or 35 parts), 40-72 parts of ultra-low density polyethylene (ULDPE) (e.g., any point value or range between any two of 40, 45, 50, 55, 60, 65, or 72 parts), and 10-30 parts of ethylene-acrylate copolymer (e.g., any point value or range between any two of 10, ... The amounts are: 5 parts, 20 parts, 25 parts or 30 parts (point values ​​or ranges between any two), 3 to 20 parts of EVM rubber (e.g., point values ​​or ranges between any two, including but not limited to 3 parts, 5 parts, 10 parts, 15 parts or 20 parts), and 0.05 to 0.2 parts of antioxidant (e.g., point values ​​or ranges between any two, including but not limited to 0.05 parts, 0.08 parts, 0.10 parts, 0.13 parts, 0.15 parts, 0.18 parts or 0.2 parts).

[0032] The adhesive resin described herein is formulated by synergistically compounding the components in specific amounts, allowing each component to exert its unique function and produce a synergistic effect. Ultra-low density polyethylene provides the basis for low-temperature processing; EVM rubber and ethylene-acrylate copolymers form a polar synergistic system, jointly achieving rapid activation and efficient wetting at low temperatures; polyolefin grafts contribute core adhesive strength while acting as key compatibilizers, ensuring the system's uniformity, stability, and absence of exudation; antioxidants ensure processing and thermal stability. Ultimately, this resin achieves a peel strength of 48~59 N / 25 mm on aluminum even under extreme process conditions of 105℃, 0.1 MPa, and 20 m / min, comprehensively meeting the comprehensive requirements of aluminum ceiling panels for low-temperature high-speed coating, high adhesive strength, no exudation, and high cost-effectiveness.

[0033] Ultra-low density polyethylene (ULDPE) is a polyethylene material with highly branched short chains, low melting point, and excellent blown film performance, which can melt rapidly at low temperatures. EVM rubber lowers the bonding temperature of the adhesive resin, and the addition of EVM rubber improves the bonding speed of the adhesive resin to aluminum at low temperatures. Its bonding speed is better than that of EAA and conventional polyethylene adhesive resins. In addition, the introduction of a certain proportion of ethylene-acrylate copolymer can significantly improve the bonding speed and bonding strength of the adhesive resin to aluminum, and its effect is better than that of EAA and conventional polyolefin adhesive resins.

[0034] The amount of polyolefin graft material used will affect the peel strength of the adhesive resin. Therefore, it is necessary to control its amount within a reasonable range. Too little material will cause the peel strength of the adhesive resin to fail to meet the application requirements, while too much material will cause the adhesive resin to have a strong odor.

[0035] The addition of ultra-low density polyethylene can improve the high-speed blown film processing performance of the adhesive resin and provide a lower bonding temperature. Too little amount will affect the high-speed blown film processing performance, while too much amount will reduce the amount of other components and affect the bonding efficiency.

[0036] Ethylene-acrylate copolymers improve the bonding efficiency of adhesive resins, especially the bonding speed, and the effect is even better when used in combination with EVM rubber. Too little dosage will result in low bonding efficiency, while too much dosage will result in a low melt index of the adhesive resin, affecting the blown film processing performance and increasing the cost.

[0037] The main function of EVM rubber is to lower the bonding temperature of the adhesive resin and increase the bonding speed. When used in combination with ethylene-acrylate copolymers, the bonding efficiency is even better. Too little EVM rubber results in a high bonding temperature, leading to low bonding efficiency, while too much EVM rubber affects the downstream high-efficiency blown film processing.

[0038] Compared with the prior art, the significant advantages of the present invention are:

[0039] 1. Low cost and domestic production: Raw materials are readily available, and the cost is lower than that of imported EAA resin.

[0040] 2. Excellent low-temperature bonding performance: Under low temperature and low pressure (105℃, 0.1Mpa) and high production speed (20m / min), the peel strength reaches 48-59N / 25mm, which is better than EAA and conventional polyolefin modified adhesive resins.

[0041] 3. Good processing performance: The blown film has good opening properties, and the presence of polyolefin grafts and ethylene-acrylate copolymers improves the compatibility between the matrix resin and EVM rubber, making the whole system highly compatible and achieving a homogeneous compatibility effect without precipitation.

[0042] Furthermore, the adhesive resin, by weight, comprises the following components:

[0043] The composition includes 15-30 parts of polyolefin graft, 45-65 parts of ultra-low density polyethylene, 15-25 parts of ethylene-acrylate copolymer, 5-15 parts of EVM rubber, and 0.1-0.15 parts of antioxidant.

[0044] Further, the melt index of the polyolefin graft is 0.5~50 g / 10 min, including but not limited to the point value of any one of 0.5 g / 10 min, 5 g / 10 min, 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, 45 g / 10 min, or 50 g / 10 min, or a range between any two. The melt index of the polyolefin graft affects the blown film performance of the adhesive resin. If the melt index is too low, it will affect the appearance of the blown film; if it is too high, it will be difficult to draw and form a film.

[0045] The melt flow index of this invention is tested at a temperature of 190°C and a load of 2.16 kg.

[0046] Furthermore, the grafting rate of the polyolefin graft is 0.5wt% to 2.8wt%, including but not limited to point values ​​or ranges between any one of 0.5wt%, 1.0wt%, 1.5wt%, 2.0wt%, 2.5wt%, or 2.8wt%. The grafting rate affects the peel strength and therefore needs to be controlled within a reasonable range.

[0047] Further, the matrix resin of the polyolefin graft comprises at least one of linear polyethylene (LLDPE), low-density polyethylene (LDPE), ethylene-vinyl acetate copolymer (EVA), or polypropylene (PP). In some specific embodiments, the matrix resin is any one of the above-mentioned matrix resins; or, the matrix resin is any two of the above-mentioned matrix resins; or, the matrix resin is any three of the above-mentioned matrix resins; or, the matrix resin is all of the above-mentioned matrix resins. When there are multiple matrix resins, the proportion of each matrix resin can be arbitrary.

[0048] Further, the linear polyethylene includes: metallocene linear polyethylene (mLLDPE).

[0049] Further, the grafting monomers of the polyolefin graft include at least one of maleic acid, maleic anhydride, itaconic acid, acrylic acid, methacrylic acid, methyl methacrylate, glycidyl methacrylate, or styrene. In some specific embodiments, the grafting monomer is any one of the above-mentioned grafting monomers; or, the grafting monomer is any two of the above-mentioned grafting monomers; or, the grafting monomer is any three of the above-mentioned grafting monomers; or, the grafting monomer is any four of the above-mentioned grafting monomers; or, the grafting monomer is any five of the above-mentioned grafting monomers; or, the grafting monomer is any six of the above-mentioned grafting monomers; or, the grafting monomer is any seven of the above-mentioned grafting monomers; or, the grafting monomer is all of the above-mentioned grafting monomers. When there are multiple grafting monomers, the ratio of each grafting monomer can be arbitrary.

[0050] This invention does not specifically limit the grafting method for polyolefin grafts. Conventional methods in the art can be used to implement this invention, such as grafting with peroxide initiation.

[0051] To obtain an adhesive resin with excellent high-speed blown film processing performance and a suitable bonding temperature, the density of the ultra-low density polyethylene is further specified to be 0.86~0.915 g / cm³. 3 (For example, it can be, but is not limited to, 0.86 g / cm³) 3 0.88g / cm 3 0.90g / cm 3 0.91g / cm 3 Or 0.915g / cm 3 The melt index is 0.5 to 50 g / 10 min (for example, it can be, but is not limited to, any one of 0.5 g / 10 min, 5 g / 10 min, 10 g / 10 min, 20 g / 10 min, 30 g / 10 min, 40 g / 10 min or 50 g / 10 min, or any one of 0.5 g / 10 min, or any one of 50 ...

[0052] Ethylene-acrylate copolymers are a class of thermoplastic polymers generated by copolymerization of ethylene monomers and acrylate monomers. In their molecular chains, the ethylene structural units provide flexibility and basic polyolefin properties, while the acrylate structural units introduce strongly polar ester groups (-COOR). The presence of these polar groups gives them excellent affinity and wettability to high surface energy materials such as metals and coatings, making them key components for providing initial adhesion and rapid bonding speed. In this invention, this copolymer works synergistically with EVM rubber to significantly reduce the activation temperature of the adhesive resin and improve the final bond strength to aluminum substrates.

[0053] Furthermore, the ethylene structural unit content of the ethylene-acrylate copolymer is 60wt% to 90wt%, including but not limited to any one of 60wt%, 65wt%, 70wt%, 75wt%, 80wt%, 85wt%, or 90wt%, or a range between any two. This content range allows the copolymer to possess both good processing fluidity and necessary polarity: the ethylene units ensure compatibility and processability with the matrix resin, while the acrylate units provide polar groups that synergistically work with EVM, jointly achieving rapid wetting and high-strength adhesion at low temperatures.

[0054] Furthermore, the acrylate in the ethylene-acrylate copolymer includes at least one of ethyl acrylate, methacrylate, butyl acrylate, methyl acrylate, or 2-vinylhexyl acrylate.

[0055] In some specific embodiments, the ethylene-acrylate copolymers include one or more of ethylene-ethyl acrylate copolymers (EEA), ethylene-methacrylate copolymers (EMA), or ethylene-butyl acrylate copolymers (EBA).

[0056] In some specific embodiments, the acrylate is any one of the aforementioned acrylates; or, the acrylate is any two of the aforementioned acrylates; or, the acrylate is any three of the aforementioned acrylates; or, the acrylate is any four of the aforementioned acrylates; or, the acrylate is all of the aforementioned acrylates. When there are multiple acrylates, the proportion of each acrylate can be arbitrary.

[0057] Further, the butyl acrylate includes: n-butyl acrylate and / or isobutyl acrylate.

[0058] Furthermore, the EVM rubber comprises an ethylene-vinyl acetate copolymer, wherein the vinyl acetate content is 50wt% to 90wt%, including but not limited to values ​​of any one of 50, 60, 70, 80, or 90, or a range between any two. This high vinyl acetate content endows the EVM rubber with excellent low-temperature flexibility and high polarity. As a key low-temperature activating component, it can significantly reduce the melting temperature and composite activation temperature of the adhesive resin, and, in conjunction with ethylene-acrylate copolymers, achieve rapid wetting of aluminum materials.

[0059] This invention does not specifically limit the type of antioxidant; conventional antioxidants in the art can be used to implement the technical solution of this invention. In some specific embodiments, the antioxidant includes: hindered phenols, phosphites, or heat stabilizers of their complexes; preferably, commercially available composite antioxidant B215 can be used.

[0060] Another aspect of the present invention relates to a method for preparing the aforementioned adhesive resin, comprising the following steps:

[0061] The raw materials are mixed and then extruded and granulated to obtain the adhesive resin.

[0062] The method for preparing the adhesive resin involves melt blending and reactive extrusion processes, which enable the components to achieve full dispersion, compatibility, and microstructure construction under controlled shear and thermal fields. This ensures that functional components such as polyolefin grafts, ethylene-acrylate copolymers, and EVM rubber are evenly distributed and exert synergistic effects, thereby efficiently producing resin particles with stable performance, no exudation, and excellent processability and high and low temperature adhesive strength in one step.

[0063] Furthermore, the extrusion is carried out in a twin-screw extruder, the parameter settings of which include: a zone one temperature of 80~100℃ (for example, it can be any point value or any range between any two of 80℃, 85℃, 90℃, 95℃ or 100℃), a zone two temperature of 100~140℃ (for example, it can be any point value or any range between any two of 100℃, 110℃, 120℃, 130℃ or 140℃), and a zone three temperature... The temperature range for Zone 1 is 120~160℃ (e.g., it can be any point value or a range between any two of 120℃, 130℃, 140℃, 150℃, or 160℃, for example, it can be any point value or a range between any two of 120℃, 130℃, 140℃, 150℃, or 160℃, for Zone 2 is 130~210℃ (e.g., it can be any point value or a range between any two of 130℃, 150℃, 170℃, 190℃, or 210℃, for example, it can be any point value or a range between any two of 130℃, 150℃, 170℃, or 190℃, for example, it can be any point value or a range between any two of 130℃, 150℃, 17 ... Zone 6 temperatures are 130~210℃ (e.g., can be, but not limited to, point values ​​of 130℃, 150℃, 170℃, 190℃, or 210℃, or a range between any two), Zone 7 temperatures are 130~210℃ (e.g., can be, but not limited to, point values ​​of 130℃, 150℃, 170℃, 190℃, or 210℃, or a range between any two), Zone 8 temperatures are... The temperature is 130~200℃ (for example, it can be any point value or any range between any two of 130℃, 150℃, 160℃, 180℃, 190℃ or 200℃), the die temperature is 130~200℃ (for example, it can be any point value or any range between any two of 130℃, 150℃, 160℃, 180℃, 190℃ or 200℃), the main machine speed is 300~500rpm, and the feeding frequency is 5~12HZ.

[0064] Another aspect of the present invention relates to an adhesive film for aluminum ceilings, comprising: the adhesive resin or an adhesive resin prepared by the method for preparing the adhesive resin.

[0065] The adhesive film for aluminum ceilings directly inherits all the technical advantages of the adhesive resin, and can perfectly adapt to high-speed lamination processes in thin film form. It can be quickly activated at a low temperature of 105℃ and a low pressure of 0.1MPa, and can achieve efficient lamination with a production line speed of 20m / min. At the same time, it gives the aluminum plate and PET composite film a durable peel strength of up to 48-59N / 25mm, and there are no exudates during production and use. It comprehensively meets the stringent requirements of industrial production for efficiency, strength and appearance.

[0066] Furthermore, the adhesive film for aluminum ceilings includes: an adhesive resin layer, a first support layer, and a second support layer stacked sequentially.

[0067] Furthermore, the adhesive resin layer comprises the adhesive resin.

[0068] Furthermore, the first support layer comprises polyethylene and color masterbatch.

[0069] Furthermore, the second support layer comprises polyethylene and color masterbatch.

[0070] Furthermore, the thickness of the adhesive film is 0.06~0.30mm, including but not limited to any one of 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.13mm, 0.15mm, 0.18mm, 0.20mm, 0.23mm, 0.25mm, 0.28mm or 0.30mm, or a range between any two.

[0071] Furthermore, the content of the adhesive resin layer is 8wt% to 12wt%, including but not limited to any one of 8wt%, 9wt%, 10wt%, 11wt% or 12wt% or any range between two of them.

[0072] This invention does not specifically limit the film-forming process of the adhesive film for aluminum ceilings; conventional blown film or cast film processes in the art can be used.

[0073] In some specific embodiments, the parameters of the blown film process include: the extrusion temperature of the adhesive resin layer is 130~180℃, the extrusion temperature of the first support layer is 140~190℃, the extrusion temperature of the second support layer is 140~190℃, the temperature of the die head is 140~190℃, and the traction speed is 10~20m / min.

[0074] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0075] The linear polyethylene used in the following examples was prepared using a conventional catalyst, such as a Ziegler-Natta catalyst. Conventional catalysts do not include metallocene catalysts. Metallocene linear polyethylene was prepared using a metallocene catalyst.

[0076] Example 1

[0077] The adhesive resin provided in this embodiment comprises the following components by weight:

[0078] 15 parts of polyolefin graft, 72 parts of ultra-low density polyethylene, 10 parts of ethylene-acrylate copolymer, 3 parts of EVM rubber and 0.2 parts of antioxidant (B215);

[0079] The polyolefin graft (EF-3A, Lushan Company) has a melt index of 2.7 g / 10 min and a grafting rate of 1.0 wt%.

[0080] The matrix resin of the polyolefin graft is metallocene linear polyethylene; the grafting monomer is maleic anhydride.

[0081] Ultra-low density polyethylene (EvolueSP0540, Primavista, Japan) has a density of 0.90 g / cm³. 3 The melt flow index is 3.8 g / 10 min, and the melting point is 100℃.

[0082] The ethylene-acrylate copolymer (Elvaloy 34035, Dow Chemical) contains 65 wt% ethylene structural units; the acrylate is butyl acrylate.

[0083] EVM rubber (Levapren500, Alronsenco, Netherlands) is an ethylene-vinyl acetate copolymer, wherein the vinyl acetate content is 50 wt%.

[0084] This embodiment provides a method for preparing adhesive resin and film for aluminum ceilings:

[0085] Step 1: Weigh the formula components according to the above proportions, mix them evenly in a high-speed mixing pot, and then extrude and granulate them using a twin-screw extruder. The parameters of the twin-screw extruder are as follows: zone 1 temperature is 90℃, zone 2 temperature is 120℃, zone 3 temperature is 140℃, zone 4 temperature is 170℃, zone 5 temperature is 170℃, zone 6 temperature is 180℃, zone 7 temperature is 180℃, zone 8 temperature is 160℃, die temperature is 160℃, main engine speed is 400RPM, and feeding frequency is 8HZ.

[0086] Step 2: The adhesive resin obtained in Step 1 is blow-molded into a 0.08mm thick film (Layer A: 10wt% adhesive resin, Layers B and C: polyethylene + color masterbatch). The blown film machine parameters are set as follows: Layer A extruder 150℃, Layer B extruder 160℃, Layer C extruder 160℃, die head 160℃, and traction speed 15m / min.

[0087] Example 2

[0088] The only difference between this embodiment and Embodiment 1 is the amount of each component. By weight, the adhesive resin includes the following components:

[0089] The composition includes 20 parts of polyolefin graft, 68 parts of ultra-low density polyethylene, 10 parts of ethylene-acrylate copolymer, 3 parts of EVM rubber, and 0.2 parts of antioxidant.

[0090] Example 3

[0091] The only difference between this embodiment and Embodiment 1 is the amount of each component. By weight, the adhesive resin includes the following components:

[0092] The composition consists of 20 parts polyolefin graft, 58 parts ultra-low density polyethylene, 20 parts ethylene-acrylate copolymer, 3 parts EVM rubber, and 0.2 parts antioxidant.

[0093] Example 4

[0094] The only difference between this embodiment and Embodiment 1 is the amount of each component. By weight, the adhesive resin includes the following components:

[0095] 20 parts of polyolefin graft, 52 parts of ultra-low density polyethylene, 20 parts of ethylene-acrylate copolymer, 8 parts of EVM rubber, and 0.2 parts of antioxidant.

[0096] Example 5

[0097] The only difference between this embodiment and Embodiment 1 is the amount of each component. By weight, the adhesive resin includes the following components:

[0098] The composition includes 25 parts of polyolefin graft, 47 parts of ultra-low density polyethylene, 20 parts of ethylene-acrylate copolymer, 8 parts of EVM rubber, and 0.2 parts of antioxidant.

[0099] Example 6

[0100] The only difference between this embodiment and Embodiment 1 is the amount of each component. By weight, the adhesive resin includes the following components:

[0101] The composition includes 25 parts of polyolefin graft, 40 parts of ultra-low density polyethylene, 25 parts of ethylene-acrylate copolymer, 10 parts of EVM rubber, and 0.2 parts of antioxidant.

[0102] Example 7

[0103] The adhesive resin provided in this embodiment comprises the following components by weight:

[0104] 15 parts of polyolefin graft, 65 parts of ultra-low density polyethylene, 15 parts of ethylene-acrylate copolymer, 15 parts of EVM rubber and 0.1 parts of antioxidant (B215);

[0105] The polyolefin graft has a melt index of 50 g / 10 min and a grafting rate of 0.5 wt%.

[0106] The matrix resin of the polyolefin graft is: linear polyethylene, metallocene linear polyethylene, and low-density polyethylene; the grafting monomer is: methyl methacrylate, glycidyl methacrylate, and styrene.

[0107] The density of ultra-low density polyethylene is 0.86 g / cm³. 3 The melt flow index is 0.5 g / 10 min, and the melting point is 105 °C.

[0108] The ethylene-acrylate copolymer contains 60 wt% ethylene structural units; the acrylates are: ethyl acrylate, n-butyl acrylate, isobutyl acrylate, and 2-ethylenehexyl acrylate;

[0109] EVM rubber is an ethylene-vinyl acetate copolymer, wherein the vinyl acetate content is 50 wt%.

[0110] This embodiment provides a method for preparing adhesive resin and film for aluminum ceilings:

[0111] Step 1: Weigh the formula components according to the above proportions, mix them evenly in a high-speed mixing pot, and then extrude and granulate them using a twin-screw extruder. The parameters of the twin-screw extruder are as follows: zone 1 temperature is 80℃, zone 2 temperature is 100℃, zone 3 temperature is 120℃, zone 4 temperature is 130℃, zone 5 temperature is 130℃, zone 6 temperature is 130℃, zone 7 temperature is 130℃, zone 8 temperature is 130℃, die temperature is 130℃, main engine speed is 400RPM, and feeding speed is 8Hz.

[0112] Step two is the same as in Example 1.

[0113] Example 8

[0114] The adhesive resin provided in this embodiment comprises the following components by weight:

[0115] 30 parts of polyolefin graft, 45 parts of ultra-low density polyethylene, 25 parts of ethylene-acrylate copolymer, 5 parts of EVM rubber and 0.15 parts of antioxidant (B215);

[0116] The polyolefin graft has a melt index of 0.5 g / 10 min and a grafting rate of 2.8 wt%.

[0117] The matrix resin of the polyolefin graft is ethylene-vinyl acetate copolymer and polypropylene; the graft monomers are maleic acid, maleic anhydride, itaconic acid and acrylic acid.

[0118] The density of ultra-low density polyethylene is 0.915 g / cm³. 3The melt flow index is 50 g / 10 min, and the melting point is 120℃.

[0119] The ethylene-acrylate copolymer contains 90 wt% ethylene structural units; the acrylates are: ethyl acrylate, methacrylate, butyl acrylate, and methyl acrylate;

[0120] EVM rubber is an ethylene-vinyl acetate copolymer, wherein the vinyl acetate content is 90 wt%.

[0121] This embodiment provides a method for preparing adhesive resin and film for aluminum ceilings:

[0122] Step 1: Weigh the formula components according to the above proportions, mix them evenly in a high-speed mixing pot, and then extrude and granulate them using a twin-screw extruder. The parameters of the twin-screw extruder are as follows: zone 1 temperature is 100℃, zone 2 temperature is 140℃, zone 3 temperature is 160℃, zone 4 temperature is 210℃, zone 5 temperature is 210℃, zone 6 temperature is 210℃, zone 7 temperature is 210℃, zone 8 temperature is 200℃, die temperature is 200℃, main engine speed is 400RPM, and feeding speed is 8Hz.

[0123] Step two is the same as in Example 1.

[0124] Example 9

[0125] The adhesive resin provided in this embodiment comprises the following components by weight:

[0126] 25 parts of polyolefin graft, 55 parts of ultra-low density polyethylene, 20 parts of ethylene-acrylate copolymer, 10 parts of EVM rubber and 0.13 parts of antioxidant (B215);

[0127] The polyolefin graft has a melt index of 25 g / 10 min and a grafting rate of 2 wt%.

[0128] The matrix resin of the polyolefin graft is: metallocene linear polyethylene, low-density polyethylene and ethylene-vinyl acetate copolymer; the graft monomers are: itaconic acid, acrylic acid, methacrylic acid and methyl methacrylate;

[0129] The density of ultra-low density polyethylene is 0.9 g / cm³. 3 The melt flow index is 20 g / 10 min, and the melting point is 110℃;

[0130] The ethylene-acrylate copolymer contains 70 wt% ethylene structural units; the acrylates are: isobutyl acrylate, methyl acrylate, ethyl acrylate and n-butyl acrylate;

[0131] EVM rubber is an ethylene-vinyl acetate copolymer, wherein the vinyl acetate content is 70 wt%.

[0132] This embodiment provides a method for preparing adhesive resin and film for aluminum ceilings: same as in Embodiment 1.

[0133] Comparative Example 1

[0134] In this comparative example, the ethylene-acrylic acid copolymer (Nucrel 3990, Dow Chemical) was blow-molded into a film, and the blow molding method was the same as step two of Example 1.

[0135] Comparative Example 2

[0136] Comparative Example 2 uses the same method as Example 1 for preparing adhesive resin.

[0137] The adhesive resin of Comparative Example 2, by weight, comprises the following components: 30 parts of polyolefin graft, 15 parts of LLDPE, 25 parts of LDPE, 10 parts of EVA, 5 parts of POE, 12 parts of HIPS, 3 parts of SIS, and 0.2 parts of antioxidant.

[0138] The polyolefin graft and antioxidant are the same as in Example 1, and the VA content of EVA is 18wt%.

[0139] Comparative Example 3

[0140] Comparative Example 3 uses the same adhesive resin as in Example 1 and its preparation method, except that the amounts of each component are different and ethylene-acrylate copolymers and EVM rubber are not added.

[0141] The adhesive resin of Comparative Example 3, by weight, comprises the following components: 15 parts of polyolefin graft, 85 parts of ultra-low density polyethylene, and 0.2 parts of antioxidant.

[0142] Comparative Example 4

[0143] Comparative Example 4 refers to the adhesive resin and its preparation method in Example 1, except that the amounts of each component are different and there is no ethylene-acrylate copolymer.

[0144] The adhesive resin of Comparative Example 4, by weight, comprises the following components: 15 parts of polyolefin graft, 80 parts of ultra-low density polyethylene, 5 parts of EVM rubber, and 0.2 parts of antioxidant.

[0145] Comparative Example 5

[0146] Comparative Example 5 refers to the adhesive resin and its preparation method in Example 1, except that the amounts of each component are different and there is no EVM rubber.

[0147] The adhesive resin of Comparative Example 5 comprises the following components by weight: 15 parts of polyolefin graft, 75 parts of ultra-low density polyethylene, 10 parts of ethylene-acrylate copolymer, and 0.2 parts of antioxidant.

[0148] Comparative Example 6

[0149] The only difference between this comparative example and Example 1 is that the grafting rate of the polyolefin graft is 3.5 wt%.

[0150] Comparative Example 7

[0151] The only difference between this comparative example and Example 1 is that ultra-low density polyethylene is replaced with an equal part by mass of low density polyethylene.

[0152] Comparative Example 8

[0153] The only difference between this comparative example and Example 1 is that the ethylene structural unit content of the ethylene-acrylate copolymer is 50 wt%.

[0154] Comparative Example 9

[0155] The only difference between this comparative example and Example 1 is that the vinyl acetate content of the EVM rubber is 40 wt%.

[0156] Experimental Example

[0157] The adhesive resins prepared in different embodiments and comparative examples were made into test strips and tested as follows. The test results are shown in Table 1.

[0158] Sample preparation: The adhesive resins prepared in different examples and comparative examples were laminated with aluminum on a laminating machine to obtain standard samples. The laminating machine parameters were set as follows: temperature 105℃, pressure 0.1Mpa, and speed 20m / min.

[0159] Peel strength test: The test method shall be in accordance with GB / T2790-1995.

[0160] Table 1. Test results of different embodiments and comparative examples.

[0161]

[0162] The blown film precipitation in different embodiments and comparative examples are as follows: Figure 1 and Figure 2 As shown.

[0163] The test results above show that the adhesive resin for aluminum ceilings of the present invention has good processing performance and no exudates. At the same time, under the low temperature and rapid bonding conditions (temperature 105℃, pressure 0.1Mpa, line speed 20m / min), the peel strength can reach 48N / 25mm, and the maximum can reach 59N / 25mm, which shows excellent low temperature bonding rate and bonding strength.

[0164] Although the present invention has been illustrated and described with specific embodiments, it should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, without departing from the spirit and scope of the present invention; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adhesive resin, characterized in that, By weight, it consists of the following components: The composition includes 10-35 parts of polyolefin graft, 40-72 parts of ultra-low density polyethylene, 10-30 parts of ethylene-acrylate copolymer, 3-20 parts of EVM rubber, and 0.05-0.2 parts of antioxidant. The EVM rubber comprises: ethylene-vinyl acetate copolymer, wherein the vinyl acetate content is 50wt%~90wt%; The grafting rate of the polyolefin graft is 1 wt% to 2.8 wt%. The density of the ultra-low density polyethylene is 0.86~0.915 g / cm³. 3 The melt flow index is 0.5~50g / 10min, and the melting point is 100~120℃; The ethylene-acrylate copolymer has an ethylene structural unit content of 60wt% to 90wt%.

2. The adhesive resin according to claim 1, characterized in that, By weight, it consists of the following components: The composition includes 15-30 parts of polyolefin graft, 45-65 parts of ultra-low density polyethylene, 15-25 parts of ethylene-acrylate copolymer, 5-15 parts of EVM rubber, and 0.1-0.15 parts of antioxidant.

3. The adhesive resin according to claim 1 or 2, characterized in that, The melt index of the polyolefin graft is 0.5~50 g / 10 min.

4. The adhesive resin according to claim 1 or 2, characterized in that, The matrix resin of the polyolefin graft includes at least one of linear polyethylene, low-density polyethylene, ethylene-vinyl acetate copolymer or polypropylene. And / or, the grafting monomers of the polyolefin graft include at least one of maleic acid, maleic anhydride, itaconic acid, acrylic acid, methacrylic acid, methyl methacrylate, glycidyl methacrylate, or styrene.

5. The adhesive resin according to claim 1 or 2, characterized in that, The acrylates in the ethylene-acrylate copolymer include at least one of ethyl acrylate, butyl acrylate, methyl acrylate, or 2-ethylhexyl acrylate.

6. A method for preparing the adhesive resin according to any one of claims 1 to 5, characterized in that, Includes the following steps: The raw materials are mixed and then extruded and granulated to obtain the adhesive resin.

7. The method for preparing the adhesive resin according to claim 6, characterized in that, The extrusion is carried out in a twin-screw extruder, and the parameters of the twin-screw extruder are set as follows: zone 1 temperature is 80~100℃, zone 2 temperature is 100~140℃, zone 3 temperature is 120~160℃, zone 4 temperature is 130~210℃, zone 5 temperature is 130~210℃, zone 6 temperature is 130~210℃, zone 7 temperature is 130~210℃, zone 8 temperature is 130~200℃, and the die temperature is 130~200℃.

8. A type of adhesive film for aluminum ceilings, characterized in that, include: The adhesive resin prepared by the method of any one of claims 1 to 5 or the adhesive resin prepared by claim 6 or 7.

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