CN1388045A - Packing bag and its application in packing catalyst - Google Patents

Abstract

The packing bag is made of composite film comprising at least three layers including an aluminum foil layer and two synthetic material layers on two sides of the aluminium foil layer. It features the ouer layer of mixed resin comprising linear low-density polyethylene and common low-density polyethylene and the inner layer of common polypropylene or flow cast polypropylene. The packing bag is suitable for packing water and/or oxygen sensitive catalyst.

Description

A kind of packaging bag and the application in catalyst packing thereof

The present invention relates to a kind of packaging bag and the application in catalyst packing thereof, more particularly relate to a kind of packaging bag and application thereof that is used for the packing of the catalyst of water and/or oxygen sensitive.

Many catalyst can reduce its catalytic performance to water and/or oxygen sensitive after the adhesive water greatly, even catalyst is damaged.Therefore to this class catalyst in its storage with need to adopt special packing to make its isolated steam and air between the delivery period, more do not allow the infiltration of liquid water, packing can not pollute and corrode catalyst simultaneously.

For example, the outer presulfurization hydrogenation catalyst of device be with the finished product hydrogenation catalyst after high temperature is sloughed adhesive water, with infusion process sulfide is loaded to the finely porous surfaces externally and internally of catalyst and makes.Because therefore the charge capacity of sulfide and the proportional relation of pore volume of catalyst must remove the adhesive water in the catalyst micropore, can guarantee that just catalyst has enough sulphur charge capacity.Outside device, also to avoid contacting in the storage of pre-sulfide catalyst finished product and the transportation with wet air.Because hydrogenation catalyst is higher than adsorption power to sulfide to the adsorption power of water, as contacting with wet air for a long time, airborne water can squeeze away the former sulfide that is adsorbed in the catalyst micropore by competitive Adsorption, causes catalyst rotten, finally causes activity of hydrocatalyst to reduce.Therefore avoid pre-sulfide catalyst contact being the problem of necessary solution in the storage of such catalyst and the transportation by improving packing method with wet air.

EP0691198A ₁Disclose a kind of packing method of catalyst, its used packaging bag is formed by three layers that comprise aluminium lamination at least, is coated with the synthetic material layer at two faces of aluminium lamination; The skin of packaging bag is to cover on the aluminium lamination with polyethylene terephthalate, and the internal layer of packaging bag is to cover on the aluminium lamination with low density polyethylene (LDPE), can contain adhesive phase between layer and the layer.The polyethylene foil of described internal layer does not contain any plasticizer or polyester pollutes catalyst to prevent it.

The purpose of this invention is to provide a kind of packaging bag that is used to pack to the catalyst of water and/or oxygen sensitive, compared with prior art this packaging bag has better intensity and air-tightness.

Another object of the present invention provides a kind of packing method of the catalyst to water and/or oxygen sensitive.

The packaging bag that is used for catalyst provided by the invention is made up of three layers the laminated film that comprises aluminium foil layer at least, is coated with the synthetic material layer at two faces of aluminium foil layer; The skin that it is characterized in that packaging bag is the hybrid resin layer that covers linear low density polyethylene (LLDPE) and low density polyethylene (LDPE) (LDPE) on the aluminium foil layer, the internal layer of packaging bag is polypropylene (PP) resin or cast polypropylene (CPP) resin bed that covers on the aluminium foil layer, can contain adhesive phase between described aluminium foil layer and the synthetic material layer.

The hybrid resin layer neutral line low density polyethylene (LDPE) of linear low density polyethylene described in the packaging bag provided by the invention (LLDPE) and low density polyethylene (LDPE) (LDPE) and low density polyethylene (LDPE) part by weight be that (80: 20) are to (20: 80).

Packaging bag provided by the invention can also further be coated with the heat sealing that a kind of heat-sealable layer is beneficial to packaging bag enclosing at the acrylic resin of described internal layer or the surface of cast polypropylene resin bed, and its fusing point of material that is used as this heat-sealable layer should hang down at least 30 ℃ than acrylic resin or cast polypropylene resin.The material of this heat-sealable layer can be, for example, and ethylene-methyl acrylate copolymer (EMA).Described acrylic resin or cast polypropylene resin bed and heat-sealable layer preferably not plasticizer-containing etc. can pollute or the component of corrosion catalyst.

The used material of adhesive phase described in the packaging bag provided by the invention can be a jointing material well known to those skilled in the art, for example can use ethylene-methyl methacrylate or ethylene-acrylic acid copolymer (EAA), ethylene-methyl acrylate-acrylic ternary copolymers etc. are perhaps introduced the ionomer of metallic ion by ionic crosslinking in EAA.

For guaranteeing that described packaging bag has enough intensity, choke and resistance moist, the thickness of aluminium foil layer is preferably at least 10 microns described in the packaging bag provided by the invention, and more preferably 16～100 microns, pinhole number is less than 20 hole/rice ²Described outer field thickness is preferably 3～60 microns; The thickness of described internal layer is preferably 20～80 microns; The thickness of described heat-sealable layer is preferably 0.5～5 micron; The thickness of described adhesive phase is preferably 1～5 micron.The gross thickness of laminated film is preferably 39～300 microns.

The size of packaging bag provided by the invention has no particular limits, and preferably making wherein, the capacity of catalyst is 20～50 kilograms.

The packing method of the catalyst to water and/or oxygen sensitive provided by the invention comprises described catalyst with foregoing packaging bags of the present invention and heat sealing.

For preventing that the packaging bag enclosing place is stained with the involution that catalyst fines influence is sealed, in the sack such as kraft paper bag, polythene film bag etc. of other material of can earlier catalyst being packed into, involution after the overcoat packaging bag of the present invention again.

For preventing that some flammable or spontaneously inflammable catalyst from meeting flame in transportation and storage process, the catalyst after can packing according to the inventive method be put into flame resistance container or fire-retardant packages such as metal bucket.

Linear low density polyethylene is the copolymer of ethene and alpha-olefin, and its mechanical characteristics such as pulling strengrth, impact strength, tear-resistant intensity and resisting environmental stress and cracking aspect all are better than traditional low density polyethylene (LDPE), but processing characteristics is poor slightly.The present invention adopts linear low density polyethylene and low density polyethylene (LDPE) blend can solve processing problems as the skin of packaging bag, and the physical property that simultaneously packaging bag is obtained for example has good especially tear strength, has breach also to be difficult for enlarging.With compare as skin with polyethylene terephthalate, packing cost reduces greatly.

Compare with polyethylene, polypropylene has lower density.Higher rigidity and hardness, crack resistance and heat stability preferably.Cast polypropylene film have the resistance moist good, heat-resisting resistance to cold is good, is easy to characteristics such as heat sealing.Its resistance to scraping and package packing machine applicability are better than polyethylene foil.Therefore, the present invention adopts polypropylene or cast polypropylene can obtain performance such as better mechanical characteristics and the wet choke of resistance when adopting polyethylene as the internal layer of packaging bag.

The heat sealing property of packaging bag enclosing can be improved in the internal layer surface of packaging bag of the present invention when containing heat-sealable layer, thereby can improve the air-tightness of whole packaging bag.

All less than 0.001 gram per 24 hours of every sq m (test method: GB1037-70 and GB1038-70), generally this durchgriff is zero for the water vapour of packaging bag of the present invention and the durchgriff of oxygen.

Claims (10)

1, a kind of packaging bag that is used for catalyst is made up of three layers the laminated film that comprises aluminium foil layer at least, is coated with the synthetic material layer at two faces of aluminium foil layer; The skin that it is characterized in that packaging bag is to cover the linear low density polyethylene on the aluminium foil layer and the hybrid resin layer of low density polyethylene (LDPE), and the internal layer of packaging bag is acrylic resin or the cast polypropylene resin bed that covers on the aluminium foil layer.

2, according to the packaging bag of claim 1, the hybrid resin layer neutral line low density polyethylene (LDPE) of wherein said linear low density polyethylene and low density polyethylene (LDPE) and the part by weight of low density polyethylene (LDPE) are that (80: 20) are to (20: 80).

3,, contain adhesive phase between wherein said aluminium foil layer and the synthetic material layer according to the packaging bag of claim 1.

4, according to the packaging bag of claim 1, wherein further be coated with a kind of heat-sealable layer at the acrylic resin of described internal layer or the surface of cast polypropylene resin bed.

5, according to the packaging bag of claim 4, wherein its fusing point of material as heat-sealable layer hangs down at least 30 ℃ than acrylic resin or cast polypropylene resin.

6, according to the packaging bag of claim 1, the thickness of wherein said aluminium foil layer is at least 10 microns, and pinhole number is less than 20 hole/rice ²Described outer field thickness is 3～60 microns; The thickness of described internal layer is 20～80 microns; The gross thickness of laminated film is preferably 39～300 microns.

7, according to the packaging bag of claim 3, the thickness of wherein said adhesive phase is 1～5 micron.

8, according to the packaging bag of claim 4, the thickness of wherein said heat-sealable layer is 0.5～5 micron.

9, according to the packaging bag of claim 1, wherein said catalyst is the catalyst to water and/or oxygen sensitive.

10, a kind of packing method of catalyst, this method comprise the catalyst described packaging bags of claim 1 to water and/or oxygen sensitive.