Lightweight corrosion-resistant composite packaging material

Abstract

A container made of the novel light corrosion-resistant composite packaging material is light in weight, can be recycled, and is high in chemical corrosion resistance and resistant to corrosion of most organic solvents. The novel light corrosion-resistant composite packaging material provided by the invention comprises an innermost fluorinated film layer in direct contact with chemicals, a middle bonding layer and an outermost protective layer. A container made of the novel light corrosion-resistant composite packaging material prepared by the invention not only is light in weight and can be recycled, but also has relatively high chemical corrosion resistance and corrosion resistance of most organic solvents.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging materials, and specifically relates to a novel lightweight, corrosion-resistant composite packaging material. Background Art

[0002] At present, containers for liquid chemicals generally include three types: glass, plastic and metal. Glass containers can hold various chemicals, but they are prone to breakage during transportation and use. Common metal containers include tin cans, aluminum bottles and various metal cans and barrels. Metal containers are bulky and take up a lot of transportation and storage space, so they are generally used to hold large quantities of chemicals and are not suitable for small-scale transportation. Common plastic containers include hard plastic barrels and soft plastic bags. In order to reduce environmental pressure, plastic barrels often need to be recycled, but their cost is high, recycling is not timely, and they take up transportation and storage space like metal containers. Soft plastic bags have great deficiencies in chemical corrosion resistance and are easily swollen and corroded by organic solvents. Summary of the invention

[0003] The purpose of the present invention is to provide a new type of lightweight and corrosion-resistant composite packaging material to address the deficiencies of the prior art. The container made of the material is not only lightweight and recyclable, but also has high chemical corrosion resistance and is resistant to corrosion by most organic solvents.

[0004] The novel lightweight corrosion-resistant composite packaging material provided by the present invention comprises an innermost fluorinated film layer (first barrier layer) in direct contact with chemicals, an intermediate adhesive layer (second layer) and an outermost protective layer (third layer);

[0005] The fluorinated film layer of the barrier layer is a FEP (perfluoroethylene propylene copolymer) film, an ETFE (ethylene-tetrafluoroethylene copolymer) film or a PVDF (polyvinylidene fluoride) film;

[0006] The first barrier layer fluorinated film layer is preferably ETFE and FEP fluorinated film.

[0007] Furthermore, the thickness of the fluorinated film of the first barrier layer is preferably 10 to 60 μm;

[0008] Furthermore, one side of the fluorinated film of the first barrier layer is subjected to plasma surface treatment to achieve a dyne value of 38 dynes;

[0009] The second adhesive layer of the intermediate layer is preferably a water-based adhesive;

[0010] Furthermore, the water-based adhesive is preferably a two-component liquid polyurethane (PUR) adhesive, including a main resin polyurethane resin and a curing agent;

[0011] As a preferred embodiment, the outermost third protective layer is preferably a thermoplastic resin;

[0012] Furthermore, the thermoplastic resin is preferably LLDPE;

[0013] Furthermore, the thickness of the LLDPE plastic resin film is preferably 10 to 60 μm;

[0014] Furthermore, one side of the LLDPE plastic resin film is subjected to a surface treatment such as plasma or corona treatment to achieve a dyne value of 38 dynes;

[0015] A specific preparation method of the novel lightweight corrosion-resistant composite packaging material provided by the present invention is as follows:

[0016] The first barrier layer fluorinated film and the third protective layer are compounded together using a solvent-free compounding process using a second bonding layer, and after curing, the new lightweight corrosion-resistant composite packaging material is prepared.

[0017] The container made of the novel lightweight corrosion-resistant composite packaging material prepared by the present invention is not only lightweight and recyclable, but also has high chemical corrosion resistance and is resistant to corrosion by most organic solvents. DETAILED DESCRIPTION

[0018] Dyne value refers to the surface tension value of the membrane tested by a dyne pen, and is also the decisive criterion for membrane surface treatment.

[0019] The novel lightweight corrosion-resistant composite packaging material provided by the present invention comprises an innermost fluorinated film layer (first barrier layer) in direct contact with chemicals, an intermediate adhesive layer (second layer) and an outermost protective layer (third layer);

[0020] The present invention first optimizes and selects the first barrier layer fluorinated film, and selects from three fluorinated films: ETFE, FEP and PVDF. ETFE is an ethylene-tetrafluoroethylene copolymer, which is made into an ETFE fluorinated film by hot melt extrusion casting; FEP is a full ethylene propylene copolymer formed by copolymerization of tetrafluoroethylene and hexafluoropropylene, which is made into an FEP fluorinated film by hot melt extrusion casting; PVDF is polyvinylidene fluoride, which is a highly non-reactive thermoplastic fluorinated polymer, which is made into a PVDF fluorinated film by hot melt extrusion casting;

[0021] The ETFE fluorinated membrane used in the specific embodiment of the present invention is sold by Jiaxing Gaozheng New Material Technology Co., Ltd. under the item number ETFE RE series; the FEP fluorinated membrane is sold by Jiaxing Gaozheng New Material Technology Co., Ltd. under the item number FEP MG series; the PVDF fluorinated membrane is sold by Jiaxing Gaozheng New Material Technology Co., Ltd. under the item number Yakai PVDF fluorine membrane for sale;

[0022] The technical solution is further described below in conjunction with embodiments.

[0023] Example 1

[0024] The novel lightweight corrosion-resistant composite packaging material provided by the present invention comprises an innermost first barrier layer fluorinated film layer in direct contact with chemicals, an intermediate second adhesive layer and an outermost third protective layer. The second adhesive layer is applied to the surface treated surface of the first barrier layer fluorinated film layer and is laminated to the surface treated surface of the third protective layer, and then rolled up and cured.

[0025] The preparation method of the provided novel lightweight corrosion-resistant composite packaging material is as follows: firstly, one side of the 25μm thick first barrier layer ETFE fluorinated film layer is subjected to plasma surface treatment to make its dyne value reach 38 dynes. The plasma surface treatment is to use a plasma surface treatment machine to perform certain physical and chemical modifications on the surface film, UV coating or plastic sheet of the packaging box to improve the surface adhesion so that it can be easily bonded like ordinary paper. One side of the 25μm thick third protective layer LLDPE is subjected to surface corona treatment to make its dyne value reach 38 dynes. The surface corona treatment refers to the use of high frequency and high voltage corona discharge on the treated plastic surface to generate low temperature plasma, so that the plastic surface generates free radical reaction and cross-links the polymer. The surface becomes rough and increases its wettability to polar solvents. These ions enter the plastic surface by electric shock and penetration to destroy its molecular structure, thereby oxidizing and polarizing the treated surface molecules, and the ion electric shock erodes the surface, thereby increasing the adhesion ability of the material surface. After the curing agent of the second bonding layer is evenly mixed with the main resin, it is applied to the plasma surface treated surface of the 25μm thick first barrier layer ETFE fluorinated film layer by roller coating, and then compounded with the corona treated surface of the 25μm thick third protective layer LLDPE. After winding, wait for the second bonding layer to complete curing.

[0026] Acetone was used to conduct preliminary chemical resistance tests on ETFE, FEP and PVDF fluorinated membranes. The test data are shown in Table 1.

[0027] Table 1: Chemical resistance test of ETFE, FEP and PVDF fluorinated membranes to acetone

[0028]

[0029] It can be seen from Table 1 that the acetone resistance of PVDF fluorinated membrane is weak, while the acetone resistance of ETFE and FEP is good.

[0030] Example 2

[0031] The preparation method of the lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0032] First, one side of the 50μm thick first barrier layer ETFE fluorinated film layer is plasma surface treated to make its dyne value reach 38 dynes; one side of the 25μm thick third protective layer LLDPE is surface corona treated to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the plasma surface treated surface of the 50μm first barrier layer ETFE fluorinated film layer by roller coating, and then compounded with the corona treated surface of the 25μm thick third protective layer LLDPE, and then rolled up and waited for the second bonding layer to complete curing.

[0033] Example 3

[0034] The preparation method of the novel lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0035] First, one side of the 25μm thick first barrier layer ETFE fluorinated film layer is subjected to plasma surface treatment to make its dyne value reach 38 dynes; one side of the 50μm thick third protective layer LLDPE is subjected to surface corona treatment to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the plasma surface treated surface of the 25μm first barrier layer ETFE fluorinated film layer by roller coating, and then compounded with the corona treated surface of the 50μm thick third protective layer LLDPE, and then rolled up and waited for the second bonding layer to complete curing.

[0036] Example 4

[0037] The preparation method of the novel lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0038] First, one side of the 50μm thick first barrier layer ETFE fluorinated film layer is subjected to plasma surface treatment to make its dyne value reach 38 dynes; one side of the 50μm thick third protective layer LLDPE is subjected to surface corona treatment to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the plasma surface treated surface of the 50μm first barrier layer ETFE fluorinated film layer by roller coating, and then compounded with the corona treated surface of the 50μm thick third protective layer LLDPE, and then rolled up and waited for the second bonding layer to complete curing.

[0039] Example 5

[0040] The preparation method of the novel lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0041] First, one side of the 50μm thick first barrier layer ETFE fluorinated film layer is subjected to plasma surface treatment to make its dyne value reach 38 dynes; one side of the 25μm thick third protective layer LLDPE is subjected to surface corona treatment to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the corona-treated surface of the 25μm thick third protective layer LLDPE by roller coating, and then compounded with the plasma surface treated surface of the 50μm first barrier layer ETFE fluorinated film layer, and then rolled up and waited for the second bonding layer to complete curing.

[0042] Example 6

[0043] The preparation method of the novel lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0044] First, one side of the 25μm thick first barrier layer ETFE fluorinated film layer is subjected to plasma surface treatment to make its dyne value reach 38 dynes; one side of the 50μm thick third protective layer LLDPE is subjected to surface corona treatment to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the corona-treated surface of the 50μm thick third protective layer LLDPE by roller coating, and then compounded with the plasma surface treated surface of the 25μm first barrier layer ETFE fluorinated film layer, and then rolled up and waited for the second bonding layer to complete curing.

[0045] Example 7

[0046] The preparation method of the novel lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0047] First, one side of the 25μm thick first barrier layer FEP fluorinated film layer is subjected to plasma surface treatment to make its dyne value reach 38 dynes; one side of the 25μm thick third protective layer LLDPE is subjected to surface corona treatment to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the plasma surface treated surface of the 25μm thick first barrier layer FEP fluorinated film layer by roller coating, and then compounded with the corona treated surface of the 25μm thick third protective layer LLDPE, and then rolled up and waited for the second bonding layer to complete curing.

[0048] Example 8

[0049] The preparation method of the novel lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0050] First, one side of the 50μm thick first barrier layer FEP fluorinated film layer is plasma surface treated to make its dyne value reach 38 dynes; one side of the 25μm thick third protective layer LLDPE is surface corona treated to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the plasma surface treated surface of the 50μm thick first barrier layer FEP fluorinated film layer by roller coating, and then it is compounded with the corona treated surface of the 25μm thick third protective layer LLDPE, and then rolled up and waited for the second bonding layer to complete curing.

[0051] Example 9

[0052] The preparation method of the novel lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0053] First, one side of the 25μm thick first barrier layer FEP fluorinated film layer is subjected to plasma surface treatment to make its dyne value reach 38 dynes; one side of the 50μm thick third protective layer LLDPE is subjected to surface corona treatment to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the plasma surface treated surface of the 25μm thick first barrier layer FEP fluorinated film layer by roller coating, and then compounded with the corona treated surface of the 50μm thick third protective layer LLDPE, and then rolled up and waited for the second bonding layer to complete curing.

[0054] Example 10

[0055] The preparation method of the novel lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0056] First, one side of the 50μm thick first barrier layer FEP fluorinated film layer is plasma surface treated to make its dyne value reach 38 dynes; one side of the 50μm thick third protective layer LLDPE is surface corona treated to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the plasma surface treated surface of the 50μm thick first barrier layer FEP fluorinated film layer by roller coating, and then it is compounded with the corona treated surface of the 50μm thick third protective layer LLDPE, and then rolled up and waited for the second bonding layer to complete curing.

[0057] Embodiment 11

[0058] The preparation method of the novel lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0059] First, one side of the 25μm thick first barrier layer FEP fluorinated film layer is subjected to plasma surface treatment to make its dyne value reach 38 dynes; one side of the 50μm thick third protective layer LLDPE is subjected to surface corona treatment to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the corona-treated surface of the 50μm thick third protective layer LLDPE by roller coating, and then compounded with the plasma surface treated surface of the 25μm thick first barrier layer FEP fluorinated film layer, and then rolled up and waited for the second bonding layer to complete curing.

[0060] Example 12

[0061] The preparation method of the novel lightweight corrosion-resistant composite packaging material provided in this embodiment is as follows:

[0062] First, one side of the 50μm thick first barrier layer FEP fluorinated film layer is subjected to plasma surface treatment to make its dyne value reach 38 dynes; one side of the 25μm thick third protective layer LLDPE is subjected to surface corona treatment to make its dyne value reach 38 dynes; after the curing agent of the second bonding layer is evenly mixed with the main resin, it is coated on the corona-treated surface of the 25μm thick third protective layer LLDPE by roller coating, and then compounded with the plasma surface treated surface of the 50μm thick first barrier layer FEP fluorinated film layer, and then rolled up and waited for the second bonding layer to complete curing.

[0063] Example 13: Testing the effect of composite packaging materials

[0064] The novel lightweight corrosion-resistant composite packaging materials prepared in Examples 5, 6, 11 and 12 of the present invention are tested. The testing method is based on the provisions of GB / T 11547-2008 - Determination of resistance of plastics to liquid chemical reagents. Under the conditions of specified temperature and specified time, the sample is completely immersed in the test liquid, and the change in mass of the sample is immediately measured after immersion or after drying.

[0065] The test results are shown in Table 2, which indicate that the lightweight corrosion-resistant composite packaging material prepared by the present invention and the containers made therefrom have high chemical corrosion resistance and are resistant to corrosion by most organic solvents.

[0066] Table 2: Chemical resistance data of ETFE and FEP fluorinated films of different thicknesses

[0067]

[0068]

[0069] Note: Soaking conditions: Soak at 75-85℃ for 7 days, but fluoric acid and ammonia water only need to be soaked at room temperature.

[0070] The novel lightweight corrosion-resistant composite packaging material prepared in Example 5 of the present invention was tested after bagging. The bag size was 60cm*100cm. The test was compared with commercially available 25 kg plastic barrels and metal barrels. The data are shown in Table 3:

[0071] Table 3 Weight of different packages with the same capacity

[0072] Test items Example 5 Commercially available plastic bucket Commercially available metal barrels Container specifications 60cm*100cm 25 kg 25 kg Packing weight 0.17kg 1.41㎏ 1.72kg

[0073] The results show that the lightweight, corrosion-resistant composite packaging material prepared in the present invention can produce containers that are significantly lighter than commercially available containers.

[0074] After making bags with the new lightweight corrosion-resistant composite packaging materials prepared in Examples 5, 6, 11 and 12 of the present invention, one cubic meter of space can hold about 7,000 bags, which takes up little space during recycling, transportation and storage, and is conducive to recycling and reuse. One cubic meter can only hold about 26 25-kilogram plastic barrels and metal barrels.

[0075] The test results show that the lightweight corrosion-resistant composite packaging material prepared by the present invention and the containers made therefrom are not only lightweight and recyclable, but also have high chemical corrosion resistance and are resistant to corrosion by most organic solvents.

[0076] The paper-plastic composite materials prepared in other embodiments were tested, and the physical and chemical properties were similar to those of Embodiment 5, Embodiment 6, Embodiment 11, and Embodiment 12, indicating that the novel lightweight corrosion-resistant composite packaging material of the present invention has similar physical and chemical properties.

Claims

1. A lightweight, corrosion-resistant composite packaging material, characterized in that: The composite packaging material comprises a first barrier layer in direct contact with chemicals, a second adhesive layer and an outermost protective layer; the barrier layer is any one or more of perfluoroethylene propylene copolymer film FEP, ethylene-tetrafluoroethylene copolymer film ETFE or polyvinylidene fluoride film PVDF.

2. The composite packaging material according to claim 1, characterized in that: The fluorine of the barrier layer is selected from perfluoroethylene-propylene copolymer film FEP or ethylene-tetrafluoroethylene copolymer film ETFE.

3. The composite packaging material according to claim 1, characterized in that: The thickness of the fluorinated film of the first barrier layer is 10-60 μm.

4. The composite packaging material according to claim 1, characterized in that: One side of the fluorinated film of the first barrier layer is subjected to plasma surface treatment to make its dyne value reach 38 dyne value.

5. The composite packaging material according to claim 1, characterized in that: The second bonding layer is a water-based adhesive.

6. The composite packaging material according to claim 5, characterized in that: The water-based adhesive is a two-component liquid polyurethane adhesive, which includes a main resin polyurethane resin and a curing agent.

7. The composite packaging material according to claim 1, characterized in that: The outermost protective layer is thermoplastic resin.

8. The composite packaging material according to claim 1, characterized in that: The thermoplastic resin is LLDPE.

9. The composite packaging material according to claim 8, characterized in that: One side of the thermoplastic resin is subjected to surface treatment such as plasma or corona treatment to achieve a dyne value of 38 dynes.

10. The method for preparing the composite packaging material according to claim 1, characterized in that: The method comprises the following steps: The first barrier layer fluorinated film and the third protective layer are compounded together by a solvent-free compounding process using a second adhesive layer, and a composite packaging material is obtained after curing.

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