CN1317529A

CN1317529A - Adhesive for coating on steel pipe

Info

Publication number: CN1317529A
Application number: CN 01107690
Authority: CN
Inventors: 汪加胜; 韩丽娜
Original assignee: Lushan Chemical Materials Co Ltd Guangzhou City
Current assignee: Lushan Chemical Materials Co Ltd Guangzhou City
Priority date: 2001-04-02
Filing date: 2001-04-02
Publication date: 2001-10-17

Abstract

An adhesive for coating it on steel pipe is prepared from reactive monomers acrylic acid, maleic acid anhydride, fumaric acid, acrylate, etc.), trigger (dipicryl perioxide, ditert-butyl perioxide, benzoyl perioxide, etc), polymer which is the mixture of polyolefincs) and antains at least 50-90 mol% of ethylene monomer, and viscosity increase (elastic polymer composed of SBS, SBR, PB, PIB, etc, vosin resin, petroleum resin, etc). Its advantages include high adhesion, high temp and water resistance and weatherability.

Description

Adhesive for coating on steel pipe

The present invention relates to industrial chemicals, particularly a kind of adhesive for coating on steel pipe.

It is anticorrosion that anti-corrosion pipeline in the past adopts pitch, coal tar enamel and fusion bonded epoxy resin that the cleaning steel is carried out the cleaning steel tube surface more, because high pollution, non-refractory and paint film are too thin easily crisp, and the water vapor permeable rate is high and be restricted.World's most countries becomes optimal insulating corrosion tubing with two-layer PE or three layers of PE anti-corrosive steel tube structure at present, thereby has mended above-mentioned deficiency.Many these type of pipeline laying of employing in relatively large gas transmission, oil transportation, water pipe construction project in these several years.The pitch of PE anti-corrosive steel tube employing in the past, EVA are the hot melt adhesive of main component, because bonding force is low, and poisonous, give and produce and use and all bring adverse consequences.For improving the temperature tolerance of hot melt adhesive, U.S. Patent number is: US 3.798118 proposes to prepare with the dystectic polypropylene of addings such as rosin glyceride, paraffin the caking agent of spackling and cardboard plastic sheet material, not mentioned the bonding of steel plastics that be used for.And China Patent No. to be 86107790A propose to use APP50-79, tackifying resin is 20-50, viscosity modifier 0-15, melt blendings such as oxidation inhibitor 0.5-1.0 obtain resistant to elevated temperatures polyolefin hot-melt, it is bonding to be used for steel pipe/PE.But see the condition that is not suitable for extruding coating processes production from synthesis technique and index, and because the existence of PP is unsuitable for the outdoor use of long term high temperature.

It is strong to the purpose of this invention is to provide a kind of bonding force, thermotolerance height, corrosion-resistant, good weatherability, and can apply extrude, steel pipe special-purpose adhesive that curtain coating is extruded.The bonding force of this tackiness agent under 20 ℃ can be reached 60-180N/cm, and the bonding force in the time of 50 ℃ reaches 130-150N/cm, has processing stable, not jag, unbroken noodles, the high-quality product of roll banding, non-foaming, high-flexibility not.

The objective of the invention is to be achieved by the following scheme: adopt mainly twin screw to extrude to implement that reaction is extruded and blending technology makes tackiness agent, adopt following component to make:

A, reaction monomers: form by (methyl) vinylformic acid, maleic anhydride, fumaric acid, methylene-succinic acid, vinylbenzene, acrylate, ethene glycidyl ether, acrylamide, glycidyl methacrylate, sodium acrylate (zinc);

B, initiator: melting graft reaction carries out under 160-250 ℃, the initiator that adopts in this scope comprises superoxide, as dicumyl peroxide (DCP), di-t-butyl peroxide, benzoyl peroxide (BPO), peroxidation lauric acid, dicumyl peroxide, 2.5-dimethyl-two (t-butyl peroxyization)-3 acetylene; The peresters class is as t-butylperoxyl benzoate; Heavy oxygen compounds such as azobis isobutyronitrile.

C, polymeric matrix, it can be one or more polyolefinic mixtures, contains the vinyl monomer of 50-90% (mol) at least, density is 0.86-0.98g/cm ³, MI is 0.5-100g/10min, the polymkeric substance that can enumerate has HDPE, LDPE, LLDPE, VLDPE, EPR, EVA, PP;

D, tackifier: the rubber-like polymkeric substance of forming by SBS, SBR, PB, PIB, APP, EPDM, EVA, SIS, SEBS, BR, or terpene resin, Gum Rosin, Microcrystalline Wax, petroleum resin, or the blend composition of two classes is formed.

Above-mentioned tackiness agent can also contain various additives, as antioxidant 1010,168, BHT, DLTP; UV light absorber, static inhibitor, pigment, filler, dyestuff, nucleator, flow ability modifying agent, fire retardant, its addition with the performance that does not influence product till, as comparing with the A+B+C+D total amount, appropriate vol is that oxidation inhibitor is 0.01-0.5%, and UV light absorber is 0.01-5%, static inhibitor is 0.01-1%, dyestuff is 0.01-10%, and filler is 0.1-30%, and nucleator is 0.01-5%, flow ability modifying agent 0.01-3%, fire retardant 0.1-30%.

The adding of the above auxiliary agent of the present invention can be applicable to different use occasions, obtains the matrix material of different purposes, to obtain high-barrier, fire-retardant, anti-aging, high and low temperature resistance.Except that can be used for anti-corrosive steel tube, also can be used for many products such as plastic-aluminum pipe (plate), packing bottle, co-extrusion packing film, splinter-proof glass, Highrise buildings doubling glass.For polar material such as glass, iron and steel, copper material, aluminium, PET, PA, EVOH, PC and non-polar material, splendid bonding effect and permanent stability are arranged as PE, PP etc.

Embodiment one: obtain serial tackiness agent with vinylformic acid, maleic anhydride and styrene monomer mixed grafting, parallel dual-screw extruding machine L/D is 32-60, best length-to-diameter ratio L/D is 48, reaction effect is best, forcing machine saves simplified the composition by 12, first segment is a charging opening, and the 6th, nine joints are double gas port, and temperature of reaction is to carry out under 160-300 ℃.The blend monomer behind the initiator uniform mixing, is coated to and wants grafted C+D polymer beads sub-surface, high-speed stirring 10min, guarantee the material uniform mixing after, extrude through twin screw, screw speed is 280r/min, cooling tie rod pelletizing and obtain the pearl glue stick.Unreacted monomer devolatilization under the condition of high vacuum degree of 0.08Mpa is completely removed, and reaches the quality of estimating this tackiness agent with aluminium flake compound stripping strength with percentage of grafting, melting index.Table 1 is the each component consumption allocation sheet of the foregoing description.

Embodiment two: use-case one is implemented polymers grafted as adhesive master batch, extrudes with one or more resin alloys of C+D resin and makes material and obtain new gluing particle.The masterbatch consumption is 10-90%, and the C resinoid is 20-80%, and the D resinoid is 0-40%, and other processing condition are described with example 1, weighs the over-all properties of tackiness agent with indexs such as melting index, stripping strength, softening temperature, fusing points.Table 2 is the consumption allocation sheet of embodiment two.

The present invention in composite structure, as implementing the compound of metal etc. and PE, then in the adhesive layer with PE material main component, be added into many 50% PP material, be preferably 0-20%, guarantee that tackiness agent and PE layer have good consistency; If the PP layer, then the base material of tackiness agent preparation should be added into many 50% PE based on PP, and the best is 0-20%, and it is good to guarantee with the PP consistency, and bonding force is strong.The D component is a preferred material with SBS, BR and APP, adds about 0-30% and can bring into play better effects, and about 10% is best.Be in the mixture of main base material with C+D, grafted monomer A alternatively is the 0.01-10% of C+D total amount, and better scope 0.1-5% is best monomer with maleic anhydride, vinylformic acid, vinylbenzene etc., selects one-component or the modification of several monomer mixed grafting.The B component is set preferred BPO, DCP under the cured processing temperature at normal PE, PP, if based on LDPE, initiator is made resin graft reactions such as BPO, HDPE, LLDPE, PP, preferred DCP.Take all factors into consideration the influence of level of response in the actual production, often adopt the initiation reaction of BPO/DCP compound system to obtain good tackiness agent, its consumption is 0.01-1.0% among the present invention, preferred 0-0.3%.

The using method of this product can adopt process implementing manufacturings such as coextrusion, lamination, curtain coating, coating or blowing.

Table 1

Table 2

Claims

1, a kind of adhesive for coating on steel pipe adopts mainly twin screw to extrude to implement that reaction is extruded and blending technology makes tackiness agent, it is characterized in that: adopt following component to make:

B, initiator: melting graft reaction is many to carry out under 160-250 ℃, the initiator that adopts in this scope comprises superoxide, as dicumyl peroxide (DCP), di-t-butyl peroxide, benzoyl peroxide (BPO), peroxidation lauric acid, dicumyl peroxide, 2.5-dimethyl-two (t-butyl peroxyization)-3-acetylene; The peresters class is as t-butylperoxyl benzoate; Heavy oxygen compounds such as azobis isobutyronitrile.

C, polymeric matrix, it can be one or more polyolefinic mixtures, contains the vinyl monomer of 50-90% at least, density is 0.86-0.98g/cm ³, MI is 0.5-100g/10min, the polymkeric substance that can enumerate has HDPE, LDPE, LLDPE, VLDPE, EPR, EVA, PP;

2, adhesive for coating on steel pipe according to claim 1, it is characterized in that: tackiness agent can also contain various additives, as antioxidant 1010,168, BHT, DLTP, UV light absorber, static inhibitor, pigment, filler, dyestuff, nucleator, flow ability modifying agent, fire retardant, its addition with the performance that does not influence product till, as comparing with the A+B+C+D total amount, appropriate vol is that oxidation inhibitor is 0.01-0.5%, UV light absorber is 0.01-5%, static inhibitor is 0.01-1%, dyestuff is 0.01-10%, and filler is 0.1-30%, and nucleator is 0.01-5%, flow ability modifying agent 0.01-3%, fire retardant 0.1-30%.

3, adhesive for coating on steel pipe according to claim 1, it is characterized in that: by the masterbatch of vinylformic acid, maleic anhydride and styrene-grafted PE, PP preparation, its consumption is 10-90% and C+D blend, prepares the tackiness agent of good bonding force and permanent stability.