Anti-slip puncture-resistant transparent PE film for mattress packaging and preparation method of anti-slip puncture-resistant transparent PE film

Abstract

The invention relates to the field of packaging film materials, in particular to an anti-skid puncture-resistant transparent PE film for mattress packaging and a preparation method of the anti-skid puncture-resistant transparent PE film. The anti-slip puncture-resistant transparent PE film for mattress packaging is prepared from the following raw materials: matrix polyethylene resin, auxiliary resin, a functional polymer, an opening anti-sticking agent, a processing aid, an antioxidant, a composite functional agent and the like. The finally prepared PE film is reasonable in structure, and the puncture resistance and the waterproof corrosion resistance of the PE film can be remarkably improved on the premise that excellent mechanical performance and skid resistance are kept, so that the requirement for higher performance of the PE film in the existing mattress packaging field is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of packaging film materials, and more particularly to a transparent PE film for mattress packaging and a preparation method thereof. BACKGROUND

[0002] In the production, transportation and storage process of mattresses, in order to prevent pollution, dampness and physical damage, the finished mattress usually needs to be packaged as a whole. At present, polyethylene (PE) film is widely used as the outer packaging material for mattresses in the industry, and low-density polyethylene (LDPE) is widely used due to its good flexibility, transparency and processing performance. LDPE film not only facilitates observation of the internal product state, but also enables rapid packaging through heat sealing technology, effectively improving packaging efficiency. In addition, its cost is relatively low, suitable for large-scale industrial application, and therefore has become one of the mainstream choices in the field of mattress packaging.

[0003] However, with the increasing complexity of the logistics system and the increasing requirements of consumers for the appearance integrity of products, the traditional LDPE film gradually exposes some performance short boards in actual application. On the one hand, the mattress is large in size and high in weight, and is prone to relative sliding with the packaging film during handling and stacking. If the surface friction coefficient of the film is low, it is difficult to maintain stable fixation, which can easily cause the packaging to shift or even fall off, affecting the overall protection effect. On the other hand, the edge or spring structure of the mattress may form local sharp stress concentration on the packaging film under pressure, and the conventional LDPE film has limited puncture resistance and is easily punctured under transportation vibration or loading impact, resulting in packaging failure and thus causing the risk of product contamination or damage. Although there are some LDPE film products on the market that have improved mechanical properties by adding masterbatch or blending modification, they often sacrifice transparency or increase cost, and the anti-skid and puncture resistance performance is difficult to optimize simultaneously.

[0004] In the prior art, attempts have been made to improve the functionality of LDPE film by surface coating with a slip-resistant coating or composite multi-layer structure, but such methods not only have complex process and high energy consumption, but also may affect the recyclability of the film, which does not meet the current trend of green packaging. In addition, although some enhanced films have certain puncture resistance, they are too smooth on the surface and may slip during stacking and transportation, which increases the difficulty of operation and safety hazards. SUMMARY

[0005] In summary, the existing LDPE film for mattress packaging still has obvious deficiencies in terms of high transparency, good slip resistance and excellent puncture resistance, and it is urgent to develop a new type of LDPE packaging film with reasonable structure, simple process and superior comprehensive performance to meet the urgent needs of modern mattress industry for efficient and safe packaging solutions. Through in-depth research in the technical direction, the inventors finally propose a mattress packaging anti-slip puncture-resistant transparent PE film and its preparation method. The PE film finally prepared not only has a reasonable structure, but also can significantly improve the puncture resistance and water resistance of the PE film under the premise of maintaining excellent mechanics and slip resistance, thereby meeting the higher performance requirements of PE film in the existing mattress packaging field.

[0006] An anti-slip puncture-resistant transparent PE film for mattress packaging, by mass fraction, the raw materials include: 85-105 parts of base polyethylene resin, 8-15 parts of auxiliary resin, 5-12 parts of functional polymer, 0.5-1.5 parts of opening anti-adhesive, 0.3-0.8 parts of processing aid, 0.1-0.3 parts of antioxidant, 0.2-0.6 parts of slip agent, 0.5-1.5 parts of antistatic agent, and 7-15 parts of composite functional agent.

[0007] Preferably, the base polyethylene resin is a combination of low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE).

[0008] Preferably, the mass ratio of the LDPE and LLDPE is (5-7):(2-3.5).

[0009] Preferably, the mass ratio of the LDPE and LLDPE is (6-7):(2.5-3).

[0010] Preferably, the auxiliary resin is ethylene-vinyl acetate copolymer and / or ethylene-methyl acrylate copolymer.

[0011] Preferably, the auxiliary resin is ethylene-vinyl acetate copolymer.

[0012] Preferably, the functional polymer is a polyolefin elastomer.

[0013] Preferably, the polyolefin elastomer is ENGAGE™ 8150, Dow, USA.

[0014] Preferably, the mass ratio of the base polyethylene resin, auxiliary resin and functional polymer is (9-10):(1-1.3):(0.7-1).

[0015] Preferably, the mass ratio of the base polyethylene resin, auxiliary resin and functional polymer is (9.5-10):(1.1-1.2):(0.8-1).

[0016] The functional polymer compounded in the present application can effectively improve the overall comprehensive performance of the PE film. The molecular chain structure thereof contains not only soft elastic segments, but also crystalline segments capable of interacting with the PE crystalline region. When subjected to external puncture or impact, the stress can be effectively absorbed and dispersed through the instantaneous deformation of a large number of flexible segments, thereby preventing the expansion of cracks and significantly improving the puncture resistance and impact toughness of the film.

[0017] On the other hand, the soft elastic segments endow the film surface with persistent slight stickiness, which, in combination with the added EVA, significantly increases the static friction coefficient between the film layers, provides stable and reliable anti-slip effect, and ensures that the overall transparency of the film is not negatively affected while the film is endowed with excellent toughness and anti-slip properties, thereby improving the overall comprehensive performance of the PE film in terms of mechanics, anti-slip and puncture resistance.

[0018] Preferably, the opening antiblocking agent is at least one of silica, diatomite, talcum powder and calcium carbonate powder.

[0019] Preferably, the opening antiblocking agent is silica or diatomite.

[0020] Preferably, the opening antiblocking agent is silica.

[0021] Preferably, the processing aid is at least one of polyethylene wax, stearic acid, sodium stearate, Fischer-Tropsch wax, paraffin oil and alkane oil.

[0022] Preferably, the processing aid is a combination of polyethylene wax and stearic acid.

[0023] Preferably, the mass ratio of the polyethylene wax and the stearic acid is (3-5):(1-3).

[0024] Preferably, the mass ratio of the polyethylene wax and the stearic acid is (4-5):(1-2).

[0025] Preferably, the antioxidant is at least one of antioxidant 246, antioxidant 1010, antioxidant 168, antioxidant 1680 and antioxidant 1076.

[0026] Preferably, the antioxidant is antioxidant 246 or antioxidant 1680.

[0027] Preferably, the slip agent is at least one of erucic acid amide, oleic acid amide, silicone and special amide.

[0028] Preferably, the slip agent is erucic acid amide or oleic acid amide.

[0029] Preferably, the antistatic agent is glycerol monostearate or ethoxylamine.

[0030] Preferably, the antistatic agent is glycerol monostearate.

[0031] Preferably, the mass ratio of the base polyethylene resin and the composite functional agent is (9-10):(0.8-1.2).

[0032] Preferably, the mass ratio of the base polyethylene resin and the composite functional agent is (9.5-10):(1-1.1).

[0033] Preferably, the composite functional agent is a combination of ultra-high molecular weight polyethylene, maleic anhydride grafted POE and liquid 1,2-polybutadiene.

[0034] Preferably, the mass ratio of the ultra-high molecular weight polyethylene, maleic anhydride grafted POE and liquid 1,2-polybutadiene is (1-3):(4-7):(3-5).

[0035] Preferably, the mass ratio of the ultra-high molecular weight polyethylene, maleic anhydride grafted POE and liquid 1,2-polybutadiene is (1.2-1.5):(5-6):(4-4.5).

[0036] Preferably, the ultra-high molecular weight polyethylene is specifically 4113, USA Ticona.

[0037] Preferably, the liquid 1,2-polybutadiene is specifically N4-9000, UK Vitamex.

[0038] Preferably, the maleic anhydride grafted POE is specifically TY 1353, USA Dow.

[0039] The composite functional agent added in the present application improves the puncture resistance, slip resistance, mechanical strength and environmental resistance of the film, while ensuring the basic transparency of the PE film. The ultra-high molecular weight polyethylene as a dispersed rigid support point can effectively hinder and passivate the impact of the puncture object, form the skeleton of the puncture resistance, and produce stronger interfacial adhesion with the polyethylene through the maleic anhydride grafted POE, to ensure effective stress transfer and also improve the polarity of the film surface, thereby providing a lasting cohesive slip effect. At the same time, its own elastomer properties further enhance the toughness of the film. The polyisobutylene as a sustainable tackifier can migrate to the film surface, significantly improve the static friction coefficient by increasing the surface tackiness, and the combined action of the three together fills and strengthens the film structure, thereby achieving the performance improvement of the mechanical strength, slip resistance and puncture resistance on a macroscopic scale.

[0040] The application relates to a preparation method of a bed mattress packaging antiskid puncture-resistant transparent PE film, which comprises the following steps: S1, mixing raw materials of a composite functional agent, base polyethylene resin and processing aids in a high-speed mixer until the materials are uniform, then carrying out melt blending, extrusion, cooling and granulation through a double-screw extruder to ensure that components are fully dispersed and plasticized to obtain a primary master batch; S2, mixing the primary master batch and all other raw materials in the high-speed mixer to ensure that all components are uniformly distributed, and feeding the mixed materials into a film blowing machine to be blow molded; and S3, controlling the thickness of the molded film, then rapidly cooling the film through a high-efficiency cooling air ring, and cutting and rolling the film to obtain the bed mattress packaging antiskid puncture-resistant transparent PE film.

[0041] Preferably, the preparation method of the bed mattress packaging antiskid puncture-resistant transparent PE film comprises the following steps: S1, mixing raw materials of a composite functional agent, base polyethylene resin and processing aids in a high-speed mixer for 10-15 min until the materials are uniform, then carrying out melt blending, extrusion, cooling and granulation through a double-screw extruder, the process temperature of the double-screw extruder is controlled to be 150-175 DEG C, the screw rotation speed is 240-300 rpm, and the components are fully dispersed and plasticized to obtain a primary master batch; S2, mixing the primary master batch and all other raw materials in the high-speed mixer for 8-12 min to ensure that all components are uniformly distributed, and feeding the mixed materials into a hopper of a film blowing machine to be blow molded, the extrusion section temperature is set to be one region 135-140 DEG C, two regions 150-155 DEG C, three regions 160-165 DEG C, four regions 170-175 DEG C and a die head 160-165 DEG C, and the blow molding is carried out at a blow-up ratio of 2.2-2.6; and S3, pulling the molded film at 15-30 m / min, then rapidly cooling the film through a high-efficiency cooling air ring, and cutting and rolling the film to obtain the bed mattress packaging antiskid puncture-resistant transparent PE film.

[0042] The application has the following beneficial effects:

[0043] 1. The PE film prepared through the method has a single-layer structure, and the puncture resistance and the water resistance and corrosion resistance of the PE film are improved under the premise of excellent mechanical properties and antiskid property, so that the higher performance requirement of the PE film in the existing bed mattress packaging field is met.

[0044] 2. The functional polymer compounded in the application can effectively improve the overall comprehensive performance of the PE film, the molecular chain structure of the functional polymer comprises soft elastic chain segments and crystalline chain segments capable of interacting with PE crystalline regions, when the PE film is subjected to external puncture or impact, the stress can be effectively absorbed and dispersed through the instantaneous deformation of a large number of flexible chain segments, and the crack propagation is prevented, so that the puncture resistance and the impact toughness of the film are remarkably improved.

[0045] 3、The composite functional agent added in the application improves the puncture resistance, slip resistance, mechanical strength and environmental resistance of the film, while ensuring the basic transparency of the PE film. The three work together to fill and strengthen the film structure, thereby improving the mechanical strength, slip resistance and puncture resistance on a macro level. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 A physical picture of the anti-slip and puncture-resistant transparent PE film for mattress packaging prepared in Example 1. DETAILED DESCRIPTION

[0047] Example 1

[0048] An anti-slip and puncture-resistant transparent PE film for mattress packaging, by mass fraction, the raw materials include: 100 parts of base polyethylene resin, 12 parts of auxiliary resin, 9.5 parts of functional polymer, 1.1 parts of opening anti-adhesive agent, 0.6 parts of processing aid, 0.2 parts of antioxidant, 0.4 parts of slip agent, 0.6 parts of antistatic agent, and 10.5 parts of composite functional agent.

[0049] The base polyethylene resin is a combination of low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE) with a mass ratio of 7:3. The LDPE is 1I2A-1 from China Yanshan Petrochemical, and the LLDPE is 7042N from China Dushanzi Petrochemical 7042N.

[0050] The auxiliary resin is ethylene-vinyl acetate copolymer; ethylene-vinyl acetate copolymer Elvax 460 from the United States DuPont.

[0051] The functional polymer is polyolefin elastomer ENGAGE™ 8150 from the United States Dow.

[0052] The opening anti-adhesive agent is silicon dioxide with an average particle size of 30 nm. The processing aid is a combination of polyethylene wax and stearic acid with a mass ratio of 4:1.5. The polyethylene wax is F-110 from China Jinan Shanhai Chemical Industry.

[0053] The antioxidant is antioxidant 246; the slip agent is erucic acid amide; and the antistatic agent is glycerol monostearate.

[0054] The composite functional agent is a combination of ultra-high molecular weight polyethylene, maleic anhydride grafted POE, and liquid 1,2-polybutadiene with a mass ratio of 1.4:5.6:4.

[0055] The ultra-high molecular weight polyethylene is specifically 4113 from the United States Teknova; the liquid 1,2-polybutadiene is specifically N4-9000 from the United Kingdom Xintema; and the maleic anhydride grafted POE is specifically TY 1353 from the United States Dow.

[0056] A preparation method of the mattress packaging anti-skid and puncture-resistant transparent PE film, comprising the following steps: specifically comprising the following steps: S1: the raw materials of the composite functional agent, the base polyethylene resin and the processing aid are fully mixed in a high-speed mixer for 12 min until the materials are uniform, and then the materials are subjected to melt blending, extrusion, cooling and granulation through a twin-screw extruder, the process temperature of the twin-screw extruder is controlled in the range of 160 to 175℃, the screw rotation speed is 260 rpm, the components are fully dispersed and plasticized to obtain the primary master batch; S2: the primary master batch and all other raw materials are jointly put into a high-speed mixer and mixed for 10 min to ensure that all components are evenly distributed, and the mixed materials are put into the hopper of a film blowing machine, the extrusion section temperature is set as a first zone of 140℃, a second zone of 150℃, a third zone of 165℃, a fourth zone of 175℃ and a die head of 165℃, and the blowing ratio is 2.4; S3: the formed film is pulled at a speed of 20 m / min, and then rapidly cooled by a high-efficiency cooling air ring, and after cutting and winding, the mattress packaging anti-skid and puncture-resistant transparent PE film is obtained.

[0057] The actual mattress packaging anti-skid and puncture-resistant transparent PE film prepared in the embodiment is shown in Figure 1 .

[0058] Example 2

[0059] The embodiment is different from the embodiment 1 only in that the mattress packaging anti-skid and puncture-resistant transparent PE film includes, by mass fraction, the base polyethylene resin 95 parts, the auxiliary resin 13 parts, the functional polymer 8 parts, the opening anti-adhesive 1.1 part, the processing aid 0.6 part, the antioxidant 0.2 part, the slip agent 0.4 part, the antistatic agent 0.6 part and the composite functional agent 10.5 parts.

[0060] The remaining embodiments are the same.

[0061] Example 3

[0062] The embodiment is different from the embodiment 1 only in that the mattress packaging anti-skid and puncture-resistant transparent PE film includes, by mass fraction, the base polyethylene resin 90 parts, the auxiliary resin 12 parts, the functional polymer 9.5 parts, the opening anti-adhesive 1.1 part, the processing aid 0.6 part, the antioxidant 0.2 part, the slip agent 0.4 part, the antistatic agent 0.6 part and the composite functional agent 9 parts.

[0063] The remaining embodiments are the same.

[0064] Comparative Example 1

[0065] Comparative Example 1 was different from Example 1 only in that the raw materials for the anti-slip puncture-resistant transparent PE film for mattress packaging included, by mass parts, base polyethylene resin 120 parts, auxiliary resin 18 parts, functional polymer 2.5 parts, opening anti-adhesive 1.1 parts, processing aid 0.6 parts, antioxidant 0.2 parts, slip agent 0.4 parts, antistatic agent 0.6 parts, and composite functional agent 12.5 parts

[0066] The remaining embodiments were the same.

[0067] Comparative Example 2

[0068] Comparative Example 2 was different from Example 1 only in that the raw materials for the anti-slip puncture-resistant transparent PE film for mattress packaging included, by mass parts, base polyethylene resin 110 parts, auxiliary resin 12 parts, functional polymer 11.5 parts, opening anti-adhesive 1.1 parts, processing aid 0.6 parts, antioxidant 0.2 parts, slip agent 0.4 parts, antistatic agent 0.6 parts, and composite functional agent 3.5 parts

[0069] The remaining embodiments were the same.

[0070] Comparative Example 3

[0071] Comparative Example 3 was different from Example 1 only in that the raw materials for the anti-slip puncture-resistant transparent PE film for mattress packaging included, by mass parts, base polyethylene resin 100 parts, auxiliary resin 4 parts, functional polymer 18.5 parts, opening anti-adhesive 1.1 parts, processing aid 0.6 parts, antioxidant 0.2 parts, slip agent 0.4 parts, antistatic agent 0.6 parts, and composite functional agent 10.5 parts

[0072] The remaining embodiments were the same.

[0073] Comparative Example 4

[0074] Comparative Example 4 was different from Example 1 only in that the composite functional agent was a combination of ultra-high molecular weight polyethylene, maleic anhydride grafted POE, and liquid 1,2-polybutadiene in a mass ratio of 0.4:8.6:2.

[0075] The remaining embodiments were the same.

[0076] Comparative Example 5

[0077] Comparative Example 5 was different from Example 1 only in that the composite functional agent was a combination of ultra-high molecular weight polyethylene, maleic anhydride grafted POE, and liquid 1,2-polybutadiene in a mass ratio of 2.4:2.6:6.

[0078] The remaining embodiments were the same.

[0079] Comparative Example 6

[0080] Comparative Example 2 is the same as Example 1 except that the composite functional agent is a combination of ultra-high molecular weight polyethylene, maleic anhydride grafted POE and liquid 1,2-polybutadiene in a mass ratio of 3.4:6:0.6.

[0081] The rest of the embodiments are the same.

[0082] Performance Test

[0083] 1. Puncture Resistance: Referring to the standard falling dart puncture tester, the film sample is clamped tightly on the ring clamp, and the 1.5 kg falling dart is selected to impact the film freely, and the mass and impact speed of the falling dart that makes 50% of the sample be punctured are obtained, and the puncture energy is obtained accordingly, and the results of 10 tests are taken as the average value and recorded in Table 1.

[0084] 2. Coefficient of Friction: Referring to ASTM D1894, the average value of 10 test results of the film / film static friction coefficient is recorded in Table 1.

[0085] 3. Tensile Strength: Referring to ASTM D882, the average value of 10 test results is recorded in Table 1.

[0086] 4. Light Transmittance: Referring to ASTM D1003, the average value of 10 test results is recorded in Table 1.

[0087] 5. Heat Seal Strength: Referring to ASTM F88, the heat seal instrument temperature is 130°C, the pressure is 0.2 MPa, the time is 1 s, and two film samples are sealed. Then the sealed sample is cut into a standard width, and a 180° peeling test is performed on a universal material testing machine at 200 mm / min, the maximum force value during peeling is recorded, and the heat seal strength is calculated, and the results of 10 tests are taken as the average value and recorded in Table 1.

[0088] Table 1 Performance Test Results Table

[0089] The performance test results of Examples 1-3 are more excellent than those of Comparative Examples 1-6, because the limited technical solutions of the present application adopted in Examples 1-3, the appropriate amount of compounded functional polymer can effectively improve the overall comprehensive performance of the PE film, the molecular chain structure of which contains both soft elastic chain segments and crystalline chain segments capable of interacting with the PE crystalline region. When subjected to external puncture or impact, the stress can be effectively absorbed and dispersed through the instantaneous deformation of a large number of flexible chain segments, preventing the propagation of cracks, thereby significantly improving the puncture resistance and impact toughness of the film. The combined action of the three added composite functional agents fills and strengthens the film structure, thereby achieving performance improvement in mechanical strength, slip resistance and puncture resistance on a macroscopic scale. Comparative Examples 1-6 do not use the limited related technical solutions, resulting in a significant decline in the effect of the corresponding raw materials in the PE film system, thereby ultimately affecting the overall performance of the PE film, resulting in a significant deviation in the corresponding performance test.

Claims

1. A bed mattress packaging antiskid puncture resistant transparent PE film characterized by: The raw materials include, in parts by mass, 85-105 parts of base polyethylene resin, 8-15 parts of auxiliary resin, 5-12 parts of functional polymer, 0.5-1.5 parts of opening anti-sticking agent, 0.3-0.8 parts of processing aid, 0.1-0.3 parts of antioxidant, 0.2-0.6 parts of slip agent, 0.5-1.5 parts of antistatic agent, and 7-15 parts of composite functional agent; The base polyethylene resin is a combination of low-density polyethylene and linear low-density polyethylene, with a mass ratio of (5-7):(2-3.5); The auxiliary resin is ethylene-vinyl acetate copolymer and / or ethylene-methyl acrylate copolymer; The functional polymer is polyolefin elastomer; The composite functional agent is a combination of ultra-high molecular weight polyethylene, maleic anhydride grafted POE, and liquid 1,2-polybutadiene.

2. The bed mattress packaging anti-slip puncture-resistant transparent PE film according to claim 1, characterized in that: The mass ratio of the base polyethylene resin, auxiliary resin, and functional polymer is (9-10):(1-1.3):(0.7-1).

3. The bed mattress packaging anti-slip and puncture-resistant transparent PE film according to claim 2, characterized in that: The mass ratio of the composite functional agent is (1-3):(4-7):(3-5).

4. The bed mattress packaging anti-slip and puncture-resistant transparent PE film according to claim 3, characterized in that: The opening anti-sticking agent is at least one of silica, diatomite, talc powder, and calcium carbonate powder.

5. The bed mattress packaging anti-slip and puncture-resistant transparent PE film according to claim 4, characterized in that: The processing aid is at least one of polyethylene wax, stearic acid, sodium stearate, Fischer-Tropsch wax, paraffin oil, and alkane oil.

6. The bed mattress packaging anti-slip and puncture-resistant transparent PE film according to claim 5, characterized in that: The slip agent is at least one of erucic acid amide, oleic acid amide, silicone, and special amide.

7. The bed mattress packaging anti-slip and puncture-resistant transparent PE film according to claim 6, characterized in that: The mass ratio of the base polyethylene resin and composite functional agent is (9-10):(0.8-1.2).

8. The bed mattress packaging anti-slip and puncture-resistant transparent PE film according to claim 7, characterized in that: The polyolefin elastomer is specifically ENGAGE™ 8150.

9. The bed mattress packaging anti-slip and puncture-resistant transparent PE film according to claim 8, characterized in that: The mass ratio of the ultra-high molecular weight polyethylene, maleic anhydride grafted POE, and liquid 1,2-polybutadiene is (1.2-1.5):(5-6):(4-4.5).

10. A process for the preparation of the anti-slip, puncture-resistant, transparent PE film for mattress packaging according to any one of claims 1 to 9, characterized by: The method includes the following steps: S1: Mix the raw material of the composite functional agent with the base polyethylene resin and processing aid in a high-speed mixer until the materials are evenly distributed, then melt blend, extrude, cool, and pelletize the mixture in a twin-screw extruder to ensure that the components are fully dispersed and plasticized to obtain a primary masterbatch; S2: Mix the primary masterbatch with all other raw materials in a high-speed mixer to ensure that all components are evenly distributed, and then blow mold the mixed material in a film blowing machine; S3: Control the thickness of the formed film, then quickly cool it with a high-efficiency cooling air ring, and cut and roll it up to obtain the final product.

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