A composite adhesive material, its preparation and use

Abstract

The application provides a composite bonding material and a preparation method and application thereof, and the composite bonding material is prepared from 40-95 parts by weight of POE, 5-60 parts by weight of styrene and 0.3-2 parts by weight of an initiator. The composite bonding material provided by the application can better bond polyethylene material and styrene-based polymer as a bonding medium, and a polyethylene / styrene-based polymer composite material with better comprehensive performance is obtained.

Description

Technical Field

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

[0002] Styrene polymers such as HIPS, PS / SBS, and SEBS have excellent impact resistance, are easy to process, and are low in cost, making them widely used in packaging films, sheets, or boards. However, their poor chemical stability limits their applications.

[0003] Polyethylene is a thermoplastic resin with excellent chemical stability, electrical insulation and corrosion resistance, but its poor rigidity and impact strength limit its application in the field of packaging materials.

[0004] To obtain materials with excellent comprehensive performance, polyethylene and styrene polymers can be combined to form films or sheets, leveraging the advantages of both materials. However, the technology of polyethylene / styrene polymer composites faces challenges and constraints. Due to the significant differences in the physicochemical properties of polyethylene and styrene polymers, the compatibility and interfacial bonding of the two materials are poor, easily leading to problems such as phase separation and interlayer delamination. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a composite adhesive material and its preparation method. The composite adhesive material, as an adhesive medium, can effectively bond polyethylene materials and styrene polymers, thereby obtaining a polyethylene / styrene polymer composite material with good overall performance.

[0006] Firstly, one of the objectives of this invention is to provide a composite adhesive material.

[0007] Specifically, the composite adhesive material is made from raw materials including POE, styrene, and an initiator. Based on a total weight of 100 parts by weight for POE and styrene, the weight parts of each component are as follows:

[0008] POE 40-95 parts by weight;

[0009] 5-60 parts by weight of styrene;

[0010] Initiator 0.3 to 2 parts by weight.

[0011] Preferably, the weight parts of each component are:

[0012] POE 50-90 parts by weight;

[0013] 10-50 parts by weight of styrene;

[0014] Initiator 0.5 to 1.5 parts by weight.

[0015] Preferably, POE is selected from copolymers of ethylene and at least one of 1-butene, 1-hexene, or 1-octene. More preferably, the POE has a melt index of 0.5–5 g / 10 min (test conditions: 190°C, 2.16 kg) and a density of 0.865–0.870 g / cm³. 3 .

[0016] Preferably, the initiator is selected from free radical initiators, more preferably from one or a combination of benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), and dicumyl peroxide (DCP).

[0017] It is worth mentioning that styrene monomers are grafted onto POE materials through an initiator, forming chemical bonds with POE materials. Therefore, the polystyrene (PS) in the resulting adhesive material is compatible with styrene-based polymers, while the POE in the adhesive material is compatible with polyethylene. This results in a good bond between polyethylene materials and styrene-based polymers, yielding a polyethylene / styrene-based polymer composite material with good overall performance.

[0018] Secondly, another objective of the present invention is to provide a method for preparing a composite adhesive material according to one of the objectives of the present invention.

[0019] Specifically, the method includes the following steps: first, styrene and an initiator are mixed and dissolved, then POE is added, the temperature is raised to 45-55°C, and after all the styrene is absorbed by POE, the temperature is raised to 87-93°C and the reaction is carried out for 85-95 minutes to obtain the composite adhesive material.

[0020] Thirdly, a third objective of the present invention is to provide the application of the composite adhesive material for one of the objectives of the present invention.

[0021] Specifically, one of the objectives of this invention is to use a composite adhesive material to bond polyethylene sheets and styrene polymer sheets, or to use a composite adhesive material to bond polyethylene sheets after being melt-mixed with a styrene polymer to obtain a polyethylene / styrene polymer composite material.

[0022] One of the objectives of this invention is to provide a composite adhesive material that can bond polyethylene materials and styrene polymers together to form a polyethylene / styrene polymer composite material with good overall performance.

[0023] Furthermore, the application method of the composite adhesive material includes the following steps:

[0024] Polyethylene material, composite adhesive material, and styrene polymer are hot-pressed into sheets with a thickness of 0.3 to 1.5 mm. The composite adhesive material sheet is then placed between the polyethylene material sheet and / or the styrene polymer sheet, and hot-pressed to obtain a polyethylene / styrene polymer composite material.

[0025] Preferably, the hot-pressing temperature is 165–195°C; more preferably, it is 170–190°C.

[0026] In a preferred embodiment of the present invention, the method of applying the composite adhesive material includes the following steps:

[0027] Polyethylene material, composite adhesive material, and styrene polymer are pressed into sheets with a thickness of 0.3 to 1.5 mm; cut into the same size; then the composite adhesive material sheet is placed in the middle layer, and the polyethylene material and styrene polymer sheets are placed in the upper and lower layers respectively, and hot-pressed to obtain a polyethylene / styrene polymer composite material.

[0028] Furthermore, the application method of the composite adhesive material includes the following steps:

[0029] The composite adhesive material and the styrene polymer material are first melt-blended to obtain a blend; then the polyethylene material and the blend are pressed into sheets with a thickness of 0.3 mm to 1.5 mm, and the blend sheet is placed between the polyethylene material sheets and hot-pressed to obtain a polyethylene / styrene polymer composite material.

[0030] In another preferred embodiment of the present invention, the method of applying the composite adhesive material includes the following steps:

[0031] The composite adhesive material and the styrene polymer material are first melt-blended to obtain a blend; then the polyethylene material and the blend are pressed into sheets; cut into the same size; then the blend sheet is placed in the middle layer, and the polyethylene material sheet is placed in the upper and lower layers respectively, and hot-pressed to obtain a polyethylene / styrene polymer composite material.

[0032] Preferably, the weight ratio of the composite adhesive material to the styrene polymer material is (1:1) to (1:8); more preferably (1:1) to (1:6).

[0033] Preferably, the hot-pressing temperature is 165–195°C; more preferably, it is 170–190°C.

[0034] Preferably, the polyethylene material is selected from one or a combination of low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE).

[0035] Preferably, the styrene polymer is selected from one or a combination of high-impact polystyrene (HIPS), PS / SEBS blends, and PS / SBS ​​blends.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] This invention provides an adhesive material that can achieve the composite of polyethylene and styrene polymer sheets. The composite sheet material obtained by the adhesive material has good interfacial bonding force, which effectively overcomes the problem that polyethylene and styrene polymer sheets cannot be composited. Detailed Implementation

[0038] The present invention will now be described in detail with reference to specific embodiments. It should be noted that the following embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the content of the present invention are still within the scope of protection of the present invention.

[0039] In the following examples and comparative examples, the raw materials were all commercially available products, as detailed below:

[0040] The POE material (LC565) was purchased from LG Chem. The melt flow index of the purchased POE was 0.5–5 g / 10 min (test conditions: 190℃, 2.16 kg), and the density was 0.865–0.870 g / cm³. 3

[0041] Benzoyl peroxide (BPO) was purchased from AKZO NONEL;

[0042] The linear low-density polyethylene (LLDPE) material was purchased from Sinopec.

[0043] High-impact polystyrene (HIPS) is sourced from Chi Mei Chemical.

[0044] The PS / SEBS blend was purchased from Ningbo Huateng First Research New Materials Co., Ltd.

[0045] The peel strength in the following examples and comparative examples was tested according to the test method of GB 8808-1988 "Peel Test Method for Flexible Composite Plastic Materials".

[0046] Example 1

[0047] This embodiment illustrates the preparation method of the composite bonding material. The raw materials and their weight proportions are shown in Table 1. The specific steps are as follows:

[0048] Add styrene to a mixing tank, then add the initiator and start stirring until the initiator is completely dissolved in the styrene. Then add POE material, heat to 50°C until the styrene is completely absorbed by the POE, then heat to 90°C and continue for 1.5 hours. Remove the material, granulate it, and set it aside for later use.

[0049] Examples 2-4

[0050] The preparation methods of the composite adhesive materials in Examples 2 to 4 are the same as those in Example 1, and the raw materials and their weight parts are shown in Table 1.

[0051] Table 1 shows the raw materials and parts by weight used in Examples 1 to 4 above.

[0052] Table 1:

[0053] styrene 10 25 35 50 POE (LC565) 90 75 65 50 Benzoyl peroxide (BPO) 0.5 0.8 1.1 1.5

[0054] Application Example 1

[0055] This application example illustrates how the composite adhesive material of Example 1 is used to bond linear low-density polyethylene (LLDPE) and high-impact polystyrene (HIPS) to form a polyethylene / styrene polymer composite material. The specific steps are as follows:

[0056] Step 1: Place LLDPE, the composite adhesive material of Example 1, and HIPS into a molding machine and hot-press them at 185°C into sheets with dimensions of 200mm*200mm*0.7mm.

[0057] Step 2: Cut the above-mentioned sheet material into sheets with dimensions of 100mm*100mm*0.7mm;

[0058] Step 3: Stack the above sheets, with the adhesive sheet in the middle layer and the LLDPE and HIPS sheets in the upper and lower layers respectively. Place them in a molding machine and hot-press them at 185°C to obtain a polyethylene / styrene polymer composite material.

[0059] Application Example 2

[0060] This application example illustrates how the composite adhesive material of Example 2 is used to bond linear low-density polyethylene (LLDPE) and high-impact polystyrene (HIPS) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 1.

[0061] Application Example 3

[0062] This application example illustrates how the composite adhesive material of Example 3 is used to bond linear low-density polyethylene (LLDPE) and high-impact polystyrene (HIPS) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 1.

[0063] Application Example 4

[0064] This application example illustrates how the composite adhesive material of Example 4 is used to bond linear low-density polyethylene (LLDPE) and high-impact polystyrene (HIPS) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 1.

[0065] Comparative application examples

[0066] This comparative application example illustrates the direct hot pressing of linear low-density polyethylene (LLDPE) and high-impact polystyrene (HIPS) to form polyethylene / styrene polymer composites without the use of any composite bonding materials.

[0067] Table 2 shows the peel strength test results of the polyethylene / styrene polymer composites prepared for corresponding use cases 1-4 and comparative application examples.

[0068] Table 2:

[0069] Peel strength (N) 9 10 13 19 0. The two layers failed to bond.

[0070] Peel strength characterizes the composite bonding strength of the composite sheets; a higher peel strength indicates a stronger composite bonding strength. Table 2 shows that the composite materials obtained after bonding using composite adhesives in Application Examples 1-4 all exhibit high peel strength values. Furthermore, as the polystyrene (PS) content in the composite adhesive increases, the bonding strength of the prepared polyethylene / styrene polymer composites also increases. In contrast, in the application examples without composite adhesives, the peel strength of directly hot-pressing LLDPE and HIPS sheets was 0, indicating that they could not be bonded together and therefore could not form a composite material.

[0071] Application Example 5

[0072] This application example illustrates how the composite adhesive material from Example 1 is first melt-blended with high-impact polystyrene (HIPS) at a weight ratio of 1:1, and then bonded to linear low-density polyethylene (LLDPE) to form a polyethylene / styrene polymer composite material. The specific steps are as follows:

[0073] Step 1: Melt-blend the composite adhesive material from Example 1 with HIPS to obtain a blend;

[0074] Step 2: Place the LLDPE and the blend from Step 1 into a molding machine and hot-press them at 190°C into sheets with dimensions of 200mm*200mm*0.7mm.

[0075] Step 3: Cut the above-mentioned sheets into sheets with dimensions of 100mm*100mm*0.7mm;

[0076] Step 4: Stack the above sheets, with the blended sheet in the middle layer and the LLDPE sheet on the top and bottom layers. Place them in a molding machine and hot-press them at 190°C to obtain a polyethylene / styrene polymer composite material.

[0077] Application Example 6

[0078] This application example illustrates how the composite adhesive material of Example 2 is first melt-blended with high-impact polystyrene (HIPS) material at a weight ratio of 1:1, and then bonded with linear low-density polyethylene (LLDPE) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 5.

[0079] Application Example 7

[0080] This application example illustrates that the composite adhesive material of Example 3 is first melt-blended with high-impact polystyrene (HIPS) material at a weight ratio of 1:1, and then bonded with linear low-density polyethylene (LLDPE) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 5.

[0081] Application Example 8

[0082] This application example illustrates how the composite adhesive material of Example 4 is first melt-blended with high-impact polystyrene (HIPS) material at a weight ratio of 1:1, and then bonded with linear low-density polyethylene (LLDPE) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 5.

[0083] Application Example 9

[0084] This application example illustrates how the composite adhesive material of Example 2 is first melt-blended with high-impact polystyrene (HIPS) material at a weight ratio of 2:3, and then bonded with linear low-density polyethylene (LLDPE) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 5.

[0085] Application Example 10

[0086] This application example illustrates how the composite adhesive material of Example 2 is first melt-blended with high-impact polystyrene (HIPS) material at a weight ratio of 1:2, and then bonded with linear low-density polyethylene (LLDPE) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 5.

[0087] Table 3 shows the peel strength test results of the polyethylene / styrene polymer composites prepared for corresponding use cases 5 to 10.

[0088] Table 3:

[0089] Peel strength (N) 10 10 19 21 8 4

[0090] As shown in Table 3, the composite bonding material, after being melt-blended with high-impact polystyrene (HIPS) and then bonded with linear low-density polyethylene (LLDPE) to form polyethylene / styrene polymer composites, also exhibits high peel strength values. This indicates that even with a reduction in the amount of composite bonding material used, good bonding of the composite material can still be achieved.

[0091] Application Example 11

[0092] This application example illustrates that the composite adhesive material of Example 2 is first melt-blended with a styrene polymer (PS / SEBS mixture, wherein the PS / SEBS ratio is 6 / 4) at a weight ratio of 1:2, and then bonded with linear low-density polyethylene (LLDPE) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 5.

[0093] Application Example 12

[0094] This application example illustrates that the composite adhesive material of Example 2 is first melt-blended with a styrene polymer (PS / SEBS mixture, wherein the PS / SEBS ratio is 6 / 4) at a weight ratio of 1:4, and then bonded with linear low-density polyethylene (LLDPE) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 5.

[0095] Application Example 13

[0096] This application example illustrates that the composite adhesive material of Example 2 is first melt-blended with a styrene polymer (PS / SEBS mixture, wherein the PS / SEBS ratio is 6 / 4) at a weight ratio of 1:6, and then bonded with linear low-density polyethylene (LLDPE) to form a polyethylene / styrene polymer composite material. The specific steps are the same as in Application Example 5.

[0097] Table 4 shows the peel strength test results of the polyethylene / styrene polymer composites prepared for corresponding use cases 11 to 13.

[0098] Table 4:

[0099] Peel strength (N) 18 13 8

[0100] As shown in Table 4, the polyethylene / styrene polymer composites prepared in Examples 11 to 13 all have high peel strength values.

[0101] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. An application of a composite adhesive material, the application method comprising the following steps: Polyethylene material, composite adhesive material, and styrene polymer are hot-pressed into sheets with a thickness of 0.3~1.5mm. The composite adhesive material sheet is then placed between the polyethylene material sheet and / or the styrene polymer sheet, and hot-pressed to obtain a polyethylene / styrene polymer composite material. or, The composite adhesive material and the styrene polymer material are first melt-blended to obtain a blend; then the polyethylene material and the blend are pressed into sheets with a thickness of 0.3mm~1.5mm respectively; then the blend sheet is placed between the polyethylene material sheets and hot-pressed to obtain a polyethylene / styrene polymer composite material. The composite adhesive material is made from raw materials including POE, styrene, and an initiator. Based on a total weight of 100 parts by weight for POE and styrene, the weight parts of each component are as follows: POE 40~95 parts by weight; 5-60 parts by weight of styrene; Initiator 0.3~2 parts by weight; The preparation method of the composite bonding material includes the following steps: First, styrene and initiator are mixed and dissolved, then POE is added, and the temperature is raised to 45~55℃. After all the styrene is absorbed by POE, the temperature is raised to 87~93℃ and the reaction is carried out for 85~95 minutes to obtain the composite adhesive material.

2. The application of the composite adhesive material according to claim 1, characterized in that, Based on a total weight of 100 parts by weight for POE and styrene, the weight parts of each component are as follows: POE 50~90 parts by weight; 10-50 parts by weight of styrene; Initiator 0.5~1.5 parts by weight.

3. The application of the composite adhesive material according to claim 1, characterized in that, The POE is selected from copolymers of ethylene and at least one of 1-butene, 1-hexene, or 1-octene; and / or, The initiator is selected from one or a combination of benzoyl peroxide, azobisisobutyronitrile, and dicumyl peroxide.

4. The application of the composite adhesive material according to claim 1, characterized in that, The hot pressing temperature is 165~195℃.

5. The application of the composite adhesive material according to claim 4, characterized in that, The hot pressing temperature is 170~190℃.

6. The application of the composite adhesive material according to claim 1, characterized in that, When the composite adhesive material and the styrene polymer material are melt-blended, the weight ratio of the composite adhesive material and the styrene polymer material is (1:1) to (1:8).

7. The application of the composite adhesive material according to claim 6, characterized in that, The weight ratio of the composite adhesive material to the styrene polymer material is (1:1) to (1:6).

8. The application of the composite adhesive material according to claim 1, characterized in that, The polyethylene material is selected from one or a combination of low-density polyethylene and linear low-density polyethylene; and / or, The styrene polymer is selected from one or a combination of high-impact polystyrene, PS / SEBS blends, and PS / SBS ​​blends.