High-temperature-resistant and creep-resistant polyethylene heat shrinkage film and film-blowing process thereof
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A heat-shrinkable film and polyethylene technology, applied in the field of plastic films, can solve the problems of poor creep resistance and achieve excellent high-temperature creep resistance
Inactive Publication Date: 2015-09-09
成都市益诚包装有限公司
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Problems solved by technology
[0005] The existing polyethylene heat-shrinkable film, due to its material itself, is used at a higher temperature, such as a high temperature environment above 40°C, and its creep resistance is poor. It is increasingly important to have excellent creep resistance above 40°C
Method used
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Embodiment 1
[0029] Inner and outer layers:
[0030] Bimodal linear low density polyethylene ( L LDPE, FB2230, Borealis) 11.2% (melt index is 0.25g / 10min, density is 0.923g / cm 3 )
[0031] Metallocene polyethylene (MVLDPE, 3505HH, ExxonMobil, USA) 38.6%
[0032] Low-pressure high-density polyethylene (5621D, China Shipping Shell) 50.2%;
[0033] middle layer:
[0034] Metallocene polyethylene (MVLDPE, 2703HH, ExxonMobil, USA) 39.8%
[0035] High-pressure low-density polyethylene (2420D, China Shipping Shell) 60.2%.
[0036] After mixing and stirring the raw materials of the above layers evenly, the product A is obtained by extruding through a three-layer co-extrusion machine.
[0037] In this example, a specific grade of raw material from a specific manufacturer was used to prepare a polyethylene heat shrinkable film with high quality, especially excellent high temperature creep resistance.
Embodiment 2
[0039] Performance Testing
[0040] The test objects are "product A" and "comparison product", and the "comparison product" is the product described in Example 3 of the Chinese patent application number 201180036127.3 as the comparison product.
[0041] High temperature creep resistance test:
[0042] The dynamic thermomechanical analyzer DMA was used to measure the creep rate (%) of "product A" and "comparative product" at a temperature of 40-70°C, a tensile stress of 50MPa, and 120h. The results are shown in Table 1:
[0043] Table 1, creep performance test results (%)
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Abstract
The invention discloses a high-temperature-resistant and creep-resistant polyethylene heat shrinkage film and a film-blowing process thereof, and belongs to the field of plastic films. The film is prepared by co-extruding an inner layer, a middle layer and an outer layer, wherein the raw materials of both the inner layer and the outer layer comprise bimodal linear low-density polyethylene, metallocene polyethylene and low-pressure high-density polyethylene, and the raw materials of the middle layer comprise metallocene polyethylene and high-pressure low-density polyethylene. The polyethylene heat shrinkage film provided by the invention is excellent in high-temperature resistance and creep resistance; under the environment of 40 DEG C or above, when 50 MPa tensile stress is applied to the film for 120 hours, the creep rate of the film is 0.2% or below, the lateral shrinkage of the film is 15-30%, the longitudinal shrinkage of the film is 55-80%, the lateral tensile strength is 50 mpa or above and the longitudinal tensile strength is 52 mpa or above. In addition, the raw materials are mixed according to appropriate proportion; in the preparation process, the melt viscosity is greatly reduced when being compared with the prior art that only linear low-density polyethylene is adopted, and the energy consumption is reduced by 35% or above when being compared with the prior art that only linear low-density polyethylene is adopted.
Description
technical field [0001] The invention relates to the technical field of plastic films, in particular to a high-temperature-resistant and creep-resistant polyethylene heat-shrinkable film and a film-blowing process thereof. Background technique [0002] Heat-shrinkable film is a thermoplastic film that is directional stretched during production and shrinks during use. It is used for sales and transportation of various products. Its main function is to stabilize, cover and protect products. The shrink film must have high puncture resistance, good shrinkage and certain shrinkage stress. According to the material, heat shrinkable film includes PE heat shrinkable film, POF heat shrinkable film and so on. [0003] Among them, polyethylene heat shrinkable film has become a widely used type of heat shrinkable film because of its excellent performance. For some application fields, the creep resistance of polyethylene heat shrinkable film is required to be high. [0004] Creep refer...
Claims
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Application Information
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