Ultrathin polyethylene microporous breathable film and preparation method thereof

A polyethylene and breathable film technology, used in chemical instruments and methods, flat products, other household appliances, etc., can solve the problems of low gram weight, leakage of inorganic calcium carbonate particles, etc., and achieve small dimensional shrinkage and excellent physical and chemical properties. Effect

Inactive Publication Date: 2020-11-06
湖北宏裕新型包材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Compared with the cast film, the strength of the blown film base material is better after film formation, so it can achieve a lower weight, even up to 10gsm, but the difficulty of the blown film process is: (1) In the high longitudinal tensile Under the condition of elongation ratio, the "dispersion" and "leaking" of inorganic calcium carbonate particles in polyethylene substrate; (2) the uniformity of blown film thickness in the production of ultra-thin breathable films of about 10gsm

Method used

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  • Ultrathin polyethylene microporous breathable film and preparation method thereof
  • Ultrathin polyethylene microporous breathable film and preparation method thereof
  • Ultrathin polyethylene microporous breathable film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The melt index is 0.5g / min, and the density is: 0.925g / cm 3 Bimodal molecular weight distribution polyethylene 20kg, particle diameter is 1.0 μ m calcium carbonate particles 70kg, silver ion antibacterial masterbatch 5kg, γ-(2,3-epoxypropoxy) propyltrimethoxysilane 3kg, antioxidant 1kg, 1 kg of polyphthalamide, dried and dehumidified, mixed uniformly, granulated by a twin-screw extruder, pelletized by water-cooling and low temperature, and used as a 75% calcium carbonate masterbatch for future use.

[0038] Such as figure 1As shown, the above-mentioned calcium carbonate masterbatch and resin pellets are mixed and dried using the following ratio to ensure that the moisture content is ≤ 300PPM. The screw machine hopper is added separately.

[0039] Inner layer: 50kg of calcium carbonate masterbatch, 25kg of linear low-density polyethylene, 23kg of ethylene-octene copolymerized polyethylene, and 2kg of polyphthalamide.

[0040] Middle layer: 70kg of calcium carbonate ma...

Embodiment 2

[0047] The melt index is 0.8g / min, the density is: 0.925g / cm 3 Bimodal molecular weight distribution polyethylene 20kg, particle size 1.0μm calcium carbonate particles 70kg, silver ion antibacterial masterbatch 5kg, 3(phenylamino)propyltrimethoxysilane 3kg, antioxidant 1kg, polyphthalamide 1kg , mixed evenly after drying and dehumidification, granulated by a twin-screw extruder, water-cooled and low-temperature granulated, and used as a 75% calcium carbonate masterbatch for later use.

[0048] Such as figure 1 As shown, the above-mentioned calcium carbonate masterbatch and resin pellets are mixed and dried using the following ratio to ensure that the moisture content is ≤ 300PPM. The screw machine hopper is added separately.

[0049] Inner layer: 50kg of calcium carbonate masterbatch, 28kg of linear low-density polyethylene, 20kg of ethylene-octene copolymerized polyethylene, and 2kg of polyphthalamide by weight.

[0050] Middle layer: 70kg of calcium carbonate masterbatch,...

Embodiment 3

[0057] The melt index is 1.5g / min, the density is: 0.93g / cm 3 Bimodal molecular weight distribution polyethylene 20kg, particle size 1.2μm lipophilic active calcium carbonate particles (lipophilic calcium carbonate obtained by surface modification of stearic acid calcium carbonate) 70kg, silver ion antibacterial masterbatch 5kg, glycidyl acrylate 3kg , 1 kg of antioxidant, 1 kg of polyphthalamide, dried and dehumidified, mixed evenly, granulated by twin-screw extruder, water-cooled and low-temperature pelletized, and used as a 75% calcium carbonate masterbatch for subsequent use.

[0058] Such as figure 1 As shown, the above-mentioned calcium carbonate masterbatch and resin pellets are mixed and dried using the following ratio to ensure that the moisture content is ≤ 300PPM. The screw machine hopper is added separately.

[0059] Inner layer: 50kg of calcium carbonate masterbatch, 30kg of linear low-density polyethylene, 18kg of ethylene-octene copolymerized polyethylene, and...

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Abstract

The invention provides an ultrathin polyethylene microporous breathable film. The breathable film is characterized by comprising an outer layer, a middle layer and an inner layer which are subjected to co-extrusion forming through a film blowing machine, and the inner layer is formed by blending, by weight, 45-60 kg of calcium carbonate master batch, 25-30 kg of polyethylene, 18-25 kg of ethyleneand octene copolymerized polyethylene and 1-3 kg of lubricant; the middle layer is formed by blending the following materials in parts by weight: 60-70kg of calcium carbonate master batch, 25-30kg ofpolyethylene and 1-3kg of lubricant; the outer layer is formed by blending, by weight, 45-60 kg of calcium carbonate master batch, 25-30 kg of polyethylene, 18-25 kg of ethylene and octene copolymerized polyethylene and 1-3 kg of lubricant. The breathable film product produced through the film blowing process is excellent in physical and chemical properties of materials, meets the requirements that the gram weight is 10-14 gsm, the moisture permeability is 1800-3200 g / 24 h / m < 2 > and the hydrostatic pressure resistance is larger than or equal to 50 mmH2O, the breathable film product is an upgraded and updated product of a traditional curtain coating breathable film, and has the advantages of being low in gram weight, high in breathability, resistant to permeation and the like. The film produced by the patent technology is small in size shrinkage rate so that colorful patterns can be formed after flexible surface printing, and the film is applied to infant diapers.

Description

technical field [0001] The invention relates to the technical field of polymer material modification, in particular to a method for preparing an ultra-thin polyethylene microporous breathable film for baby diapers. Background technique [0002] Microporous breathable film is a breathable and waterproof functional film material, which is mostly used in personal hygiene care products such as baby diapers, women's sanitary napkins, and medical protective clothing. The breathable film is generally made by uniformly adding a functional inorganic substance into the polyolefin raw material, and after being extruded into a film, it is stretched at a high power to produce a large number of micropores, so that it has breathable and waterproof features. However, judging from the current application, most of them are produced by casting technology, and there are common problems such as "easy shrinkage, low hydrostatic pressure resistance, high grammage". Therefore, in order to solve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B3/24B32B27/18B32B27/06B32B33/00C08L23/08C08L77/00C08K9/04C08K3/26C08L23/06C08L23/36C08J5/18C08J3/22C08K3/08C08K3/24C08K3/28C08K5/5435C08K5/1515C08K5/544C08L91/00C08L71/02C08L33/14C08K13/06C08K7/26B29C55/02B29D7/01
CPCB32B27/32B32B3/266B32B27/18B32B27/08B32B33/00C08J5/18C08J3/226B29D7/01B29C55/023C08J2323/08C08J2423/08C08J2477/00C08K9/04C08K2003/265C08J2423/06C08J2423/36C08J2323/36C08K2003/0806C08K3/24C08K3/28C08K5/5435C08K5/1515C08K5/544C08J2491/00C08J2471/02C08J2433/14C08K13/06C08K7/26B32B2307/7265B32B2307/724B32B2555/02B32B2250/242B32B2250/03
Inventor 邓锐熊涛李知洪石如金邹家武
Owner 湖北宏裕新型包材股份有限公司
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