CN1155653C

CN1155653C - Process for preparing single-layer gas-phase antirusting film

Info

Publication number: CN1155653C
Application number: CNB011281987A
Authority: CN
Inventors: 丁国祯; 白芳; 安成强; 唐艳秋
Original assignee: SHENYANG RUST-PROOF AND PACKAGE MATERIALS CORP
Current assignee: Shenyang Rustproof Packaging Material Co., Ltd.
Priority date: 2001-09-25
Filing date: 2001-09-25
Publication date: 2004-06-30
Anticipated expiration: 2021-09-25
Also published as: CN1343740A

Abstract

The present invention relates to a single-layer gas phase rust-proof thin film prepared from matrix resin and additive agents, wherein the matrix resin is polyethylene, and the additive agents mainly comprise a gasified corrosion inhibitor VCI; the polyethylene accounts for 93.5% to 96%, the additive agents, such as the VCI, etc., account for 4% to 6.5%, and the single-layer gas phase antirust film is formed by extrusion blow molding after the polyethylene and the additive agents are mixed. The polyethylene as the matrix resin is prepared from film blowing grade LDPE or LLDPE or a combination of the film blowing grade LDPE and the LLDPE; the VCI is anhydrous sodium molybdate, dicyclohexylammonium nitrite or sodium nitrite, monoethanolamine benzoate or ammonium benzoate or a mixture of sodium nitrite and urotropine, or phenyltriazole or a combination of the anhydrous sodium molybdate, the dicyclohexylammonium nitrite or the sodium nitrite, the monoethanolamine benzoate or the ammonium benzoate or the mixture of sodium nitrite and urotropine, and the phenyltriazole. The production of the single-layer gas phase rust-proof thin film mainly comprises material selection, pretreatment of the additive agents, drying, stirring, cooling, granulation and coextrusion blow moulding. The present invention has the characteristics of simple structure, high transparence, softness, good heat-sealing property, processability, mould ability, simple and stable processing technology, continuous production realization, VCI slow release, rust-proof life prolongation, appearance improvement, both-side effectiveness and easy recycle. The single-layer gas phase rust-proof thin film can be widely used for the rust-proof packaging of metal and the rust-proof packaging of metal products.

Description

The manufacture method of single-layer gas-phase antirusting film

Technical field: the present invention relates to a kind of metal and metal products manufacture method, specifically a kind of manufacture method of single-layer gas-phase antirusting plastics film with rustproof packing usefulness material.

Background technology: metal and metal products be in transportation, in the storage process, is easy to be subjected to the corrosion of environment such as atmosphere and influences outward appearance, performance, even cause and scrap.Carry out the rust-proof seal packing so be necessary metal and goods thereof long to transportation, period of storage or that be under high temperature, the super-humid conditions.Traditional rustproof packaging material is a volatile rust preventive paper.China produces volatile rust preventive paper the history in 40 years, China's metal products antirust played great role, but also there are some shortcomings in itself, mainly show as: 1, opaque, can not directly distinguish packed article and surface corrosion situation thereof, and break a seal, observe, seal up for safekeeping again the process trouble, and can cause the loss of effective VCI through these processes, reduce rust-proof effect, shortened the protection period, even must change wrapping material; 2, Boardy Feeling, easily curling, inconvenient operation; 3, can not machine-shaping, as volatile rust prevention bag etc., use range, mode are restricted; 4, because of anti-tarnish paper mostly is the paper composite prod, the natural degradation cycle is long, and recycling has limitation, and is bigger to the influence of environment; 5, outer packaging is not attractive in appearance, can not embody the class of packing material; 6, poor sealing, the VCI loss is bigger.7, manufacture method more complicated.

In addition, also have application type plastics anti-rust film and the double-deck blowing type anti-rust film that contains HDPE now, the former poor transparency, and in use, when especially closely contacting in use more than 40 ℃ or with packed article, coating has been transferred to the metallic surface and pollution metal, and also there are some shortcomings in the latter: 1, be restricted because of the selecting for use of the higher VCI of making of processing film temperature, effect; 2, because of HDPE is crisp, easy jackknifing during use; 3, VCI can only be to the one side volatilization, and this is inapplicable in the two-sided effective occasion of needs, and cost will be doubled; 4, poor because of the consistency of VCI and plastics, and do not have solution in the general double-layer coextrusion antirust film, cause VCI just to separate out in a short time to film surface, the anti-rust film dirty appearance is clean, rust-proof life descends, transparency descends, pollution metal thereby make; 5, because of duplicature simultaneously has rust inhibition, one side does not have a rust inhibition, is easy to cause effective surface to obscure in the processing of a definite form, in using, and will can not play any rust inhibition during in the face of metal when invalid; 6, aspect manufacturing process, existing method is that VCI and polyethylene are mixed, grind, and puts into then and carries out blowing in the forcing machine.There is following shortcoming in this method: will melt because of some inhibiter temperature are high slightly, cause in the easy fusing of forcing machine feed zone " lubricating substance " and " making somebody a mere figurehead ", influence the continuous production of product, material needs matching while using, inconvenient, also carefully do not cause in the film granularity bigger, have a strong impact on outward appearance and production technique, even cause " gas leakage " and can not ordinary production because of inhibiter grinds.

Summary of the invention: the objective of the invention is to overcome the shortcoming of the said products, propose a kind of manufacture method of single-layer gas-phase antirusting plastics film.This kind gas-phase antirusting film, be made up of matrix resin and compound, matrix resin is a polyethylene, and compound is made up of gasification property inhibiter VCI, dispersion sorbent material and lubricant, after extrusion-blown modling forms, concrete manufacture method is undertaken by following processing step with the two mixing:

(1) select materials: selecting melting index is the vector resin of the LDPE of 2-7g/10min as the VCI masterbatch, its content is 60%-85%, selects the center component of VCI as compound in the VCI masterbatch, and its consumption is the 10%-35% of VCI masterbatch, VCI is meant anhydrous molybdic acid sodium, or dicyclohexyl amine nitrite, or Sodium Nitrite, or the phenylformic acid monoethanolamine, or ammonium benzoate, or urotropine, or 124 Triazole, or two or more the composition in above-mentioned these seven kinds; Select organic polymer lubricant or organic metal salt lubricant and inorganic dispersion sorbent material as the auxiliary addition agent in the compound, its consumption is respectively the 1%-3% and the 2%-4% of VCI masterbatch.

(2) pre-treatment of VCI and dispersion sorbent material: selected VCI and dispersion sorbent material are mixed, and put into abrasive dust equipment, be milled to particle fineness more than 600 orders;

(3) will grind good powder in 100-120 ℃ of ventilating drying equipment dry 2-3 hour, the monolayer powder body thickness is not more than between 20mm greater than 0mm;

(4) vector resin is placed on to be stirred to plastic pellet surface in the homogenizer softening, adds above-mentioned powder and lubricant, continue to be stirred to powder and evenly stick on the plastic pellet, but till plastic pellet do not cohere mutually again;

(5), put tablets press afterwards into and carry out granulation with the raw material naturally cooling after the high-speed stirring;

(6) the VCI masterbatch that will make is with 1: 1-1: 16 ratio and polyethylene uniform mixing;

(7) raw material that mixes is put in the forcing machine charging basket of blown film equipment and carries out extrusion-blown modling, blow temperatures between 140-190 ℃, the tubular membrane that blows out through air-cooled, batch and promptly make gas-phase antirusting film.

This invention is simple in structure, but has that transparency is good, soft, the good machine-shaping of heat sealability, complete processing simple and stable, can realize serialization production, make the VCI slowly-releasing, prolongs rust-proof life, improves outward appearance, two-sided characteristics effective, easy to be recycled.

Embodiment: this kind gas-phase antirusting film, to form by matrix resin and compound, matrix resin is a polyethylene, compound mainly is gasification property inhibiter VCI, wherein polyethylene accounts for 93.5%-96%, and compound is 4%-6.5%, with the two mixing after extrusion-blown modling form.The matrix resin polyethylene is that weight accounts for the 93.5%-96% of film total amount by the blown film level LDPE of melting index 0.5-7g/10min or LLDPE or the combination of the two, and compound accounts for 4%-6.5%.VCI is meant anhydrous molybdic acid sodium, or dicyclohexyl amine nitrite, or Sodium Nitrite, or the phenylformic acid monoethanolamine, or ammonium benzoate, or urotropine, or 124 Triazole, or two or more the composition in above-mentioned these seven kinds; Disperse sorbent material to be meant lime carbonate or aluminum oxide or barium sulfate or silica gel, lubricant is meant Zinic stearas or polyethylene wax or oxidized polyethlene wax or its combination.

By the proportioning of said components, get 1 kilogram of dicyclohexyl amine nitrite, 0.15 kilogram of mixing of 1250 order light calcium carbonates, to put airflow milling into and carried out abrasive dust 40 minutes, discharging-material size 95% is more than 800 orders, and 100% more than 600 orders.Put powder into 105 ℃ of convection oven and carry out drying, take out after 2.5 hours.Get melting index and be 6 kilograms of the LDPE of 4g/10min, put into homogenizer and stir, the rear surface was softening in 2 minutes, the powder that put into 0.2 kilogram of OPE and ground this moment, high-speed stirring 1 minute, powder is bonded on the polyethylene particles substantially, emit, pack, be placed on indoor shady and cool place cooling.After being cooled to room temperature, take out granulation.Get melting index and be 4.65 kilograms of 15 kilograms of 2g/10min LDPE, LLDPE and and cooled masterbatch in homogenizer, mix, after mixing, emit and be added in the charging basket of blown film unit, blow temperatures is located at 155-185 ℃, be blow molded into tubular membrane, 100 microns of thickness, air blast is simultaneously cooled off, is batched, and promptly makes single-layer gas-phase antirusting film.

Claims

1, a kind of manufacture method of single-layer gas-phase antirusting film, it is characterized in that: this kind gas-phase antirusting film, form by matrix resin and compound, matrix resin is a polyethylene, compound is made up of gasification property inhibiter VCI, dispersion sorbent material and lubricant, after extrusion-blown modling forms, concrete processing step is as described below with the two mixing:

(1) select materials: selecting melting index is the vector resin of the LDPE of 2-7g/10min as the VCI masterbatch, its content is 60%-85%, selects the center component of VCI as compound in the VCI masterbatch, and its content is the 10%-35% of masterbatch, VCI is meant anhydrous molybdic acid sodium, or dicyclohexyl amine nitrite, or Sodium Nitrite, or the phenylformic acid monoethanolamine, or ammonium benzoate, or urotropine, or 124 Triazole, or two or more the composition in above-mentioned these seven kinds; Select organic polymer lubricant or organic metal salt lubricant as the lubricant in the compound in the VCI masterbatch, its consumption is the 1%-3% of masterbatch; Select inorganic dispersion sorbent material as the dispersion sorbent material in the compound, its consumption is the 2%-4% of masterbatch;

2, the manufacture method of single-layer gas-phase antirusting film according to claim 1, it is characterized in that: the colour batch that in step (7), adds different colours, make antirust film present required color, but this colour batch should not produce any detrimentally affect to rustless property.

3, the manufacture method of single-layer gas-phase antirusting film according to claim 1 and 2, it is characterized in that: polyethylene is that melting index is LDPE or LLDPE or its combination of 0.5-7g/10min, weight accounts for the 93.5%-96% of film total amount, and compound accounts for 4%-6.5%.

4, the manufacture method of single-layer gas-phase antirusting film according to claim 1 and 2, it is characterized in that: VCI is meant anhydrous molybdic acid sodium, or dicyclohexyl amine nitrite, or Sodium Nitrite, or the phenylformic acid monoethanolamine, or ammonium benzoate, or urotropine, or 124 Triazole, or two or more the composition in above-mentioned these seven kinds; Disperse sorbent material to be meant lime carbonate or aluminum oxide or barium sulfate or silica gel, lubricant is meant Zinic stearas or polyethylene wax or oxidized polyethlene wax or its combination.