CN106046567A - Compound sealing strip with enhanced waterproof performance for switch cabinet - Google Patents

Abstract

The invention discloses a compound sealing strip with enhanced waterproof performance for a switch cabinet. The compound sealing strip is prepared from the following raw materials in parts by weight: 100 to 105 parts of ethylene-propylene-diene monomer, 15 to 17 parts of OMMT, 20 to 22 parts of high-density polyethylene, 7 to 9 parts of molybdenum disulfide, 2 to 3 parts of polytetrafluoroethylene powder, 3 to 4 parts of DOP, 0.2 to 0.22 part of dibenzoyl peroxide, 4 to 5 parts of maleic anhydride, 2.5 to 3 parts of sulfur powder, 12 to 14 parts of carbon black, 0.8 to 1 part of 2-mercaptobenzimidazole, 0.3 to 0.4 of an accelerator NS, 3 to 4 parts of emulsified asphalt, 7 to 8 parts of attapulgite, 0.6 to 0.7 part of methyl trimethoxy silane, 0.8 to 1 part of isopropyl tris(dioctyl pyrophosphate)titanate, and a proper amount of anhydrous ethanol. The sealing strip prepared according to the invention can be used for sealing an outdoor electric switch cabinet, and has good water-proof performance and good aging resistance.

Description

The switch cubicle compound sealing strip that a kind of water resistance strengthens

Technical field

The present invention relates to field of rubber technology, particularly relate to the switch cubicle compound sealing strip that a kind of water resistance strengthens.

Background technology

Switch cubicle is the equipment of a kind of electric power being supplied to required for people's production, life, and its casing is by front shrouding, side Shrouding and the sealing structure of rear shrouding composition.But, when several switch cabinet combination assembly are used, the side seal board spliced mutually it Between there will be gap.This gap not only affects overall appearance, and is easy to fall into dust or water droplet, is also not enough to stop Electromagnetic radiation, causes the unsafe factor in use.For preventing inside the access switch cabinets such as dust, foreign body or moisture, and cause The hydraulic performance decline of cabinet inner part or damage, the use of sealed switch cabinet is more and more extensive, therefore the requirement to sealing is more and more higher, Especially air seal switch cubicle.Cabinet sealing strip can be by having favorable elasticity and the EPDM of incompressible deformation Rubber is made, though having superior mechanical performance and ageing-resistant performance etc., but in use due to light, heat, oxygen and corruption The impact of the environmental factorss such as erosion medium still can cause the progressively deterioration of performance, causes EPT rubber packing bar to lose efficacy, therefore, Improve its durability by ethylene propylene diene monomer (EPDM) material is modified, make for improving EPT rubber packing material By performance, extend its service life significant.

In " preparation of organo montmorillonite/EPT rubber packing material and performance study " literary composition, organic illiteracy is used to take off Ethylene propylene diene rubber is modified by soil, defines exfoliated or intercal type nano composite construction, can improve EPDM The air-liquid barrier property of rubber, heatproof air aging performance and the resistance to ageing properties that repeatedly soaks.It is subsequently used for shrouding before switch cubicle Sealing joint strip but due to needs often switch, because of friction, sealing joint strip quick abrasion, is easily caused poor sealing.In above-mentioned article Although sealing strip ethylene propylene diene monomer (EPDM) material having been carried out ageing-resistant modification, but the enhancing of its wearability not having be emphasized, This is accomplished by being modified original sealing strip material, to meet the demand of existing various switch cubicle.

Summary of the invention

The object of the invention is contemplated to make up the defect of prior art, it is provided that the switch cubicle that a kind of water resistance strengthens is with multiple Close sealing strip.

The present invention is achieved by the following technical solutions:

The switch cubicle compound sealing strip that a kind of water resistance strengthens, is prepared by the raw materials in: ethylene propylene diene rubber 100-105, OMMT15-17, high density polyethylene (HDPE) 20-22, molybdenum bisuphide 7-9, polytetrafluoroethylene powder 2-3, DOP3-4, peroxidating Dibenzoyl 0.2-0.22, maleic anhydride 4-5, Cosan 2.5-3, white carbon black 12-14,2-mercaptobenzimidazole 0.8-1, accelerator NS0.3-0.4, emulsified asphalt 3-4, attapulgite 7-8, MTMS 0.6-0.7, isopropyl three (dioctyl Jiao's phosphorus Acid acyloxy) titanate esters 0.8-1, dehydrated alcohol be appropriate.

The switch cubicle compound sealing strip that described a kind of water resistance strengthens, is made up of step in detail below:

(1) high density polyethylene (HDPE) and DOP, molybdenum bisuphide, polytetrafluoroethylene powder are put in high speed mixer, with 1000-1200 Rev/min speed mix 6-8 minute, be then fed in double screw extruder, add dibenzoyl peroxide, maleic anhydride, add Hot to 90-100 DEG C, extruding pelletization, obtain wear-resisting lubricating modification master batch；

(2) MTMS is mixed with isopropyl three (dioctylphyrophosphoric acid acyloxy) titanate esters, add total amount 2-3 The dehydrated alcohol of times amount, stirring is to being completely dissolved formation solution for later use；Attapulgite is pulverized, crosses 200 mesh sieves, with 2-3 times amount Dehydrated alcohol mixing after add above-mentioned solution, with Rate Dispersion 60-90 minute of 1000-1200 rev/min, sucking filtration, filter cake is used Absolute ethanol washing mixes with emulsified asphalt for 2-3 time afterwards, allows in ball mill, and ball milling put into vacuum drying oven after 30-40 minute In be dried with the temperature of 60-70 DEG C, obtain mixed-powder；

(3) by ethylene propylene diene rubber and OMMT in banbury mixing 8-10 minute, melting temperature is kept to be 130-140 DEG C, so After be sequentially added into mixed-powder, Cosan, white carbon black and remaining residual components that step (2) obtains, continue to be incubated mixing 10-12 Minute, discharging, then it is pressed into thin slice through two-roll mill, obtains masterbatch；

(4) the lubricating modification master batch that step (1) obtains is put in twin-screw extruder, be heated to after abundant fusion plastification with step (3) the masterbatch mixing obtained, is then fed in single screw extrusion machine, controls screw speed 30-40 rev/min, extruder temperature 90- 100 DEG C, blend glue stuff is made to extrude continuously, through 1000-1500MHz microwave continuous vulcanization molding, at electric heating drum after parking 24 hours In wind baking oven, the temperature with 150-160 DEG C vulcanizes 100-120 minute, obtains the present invention.

The invention have the advantage that the present invention under the initiation of dibenzoyl peroxide, for molybdenum bisuphide, politef The high density polyethylene (HDPE) that powder is blended carries out modified by maleic acid anhydride graft process and obtains wear-resisting lubricating modification master batch, has not only possessed good Good wear-resisting, self-lubricating property, well can be combined with rubber matrix simultaneously；The present invention utilizes by the way of melt blending Ethylene propylene diene rubber is modified by OMMT, defines the nano composite structure of intercal type, can significantly improve ethylene-propylene-diene monomer The air-liquid barrier property of glue, heatproof air aging performance and the resistance to ageing properties that repeatedly soaks；Finally by wear-resisting lubricating modification is female Grain fusion plastification mixes with modified ethylene propylene diene rubber masterbatch, through extrusion continuously and is produced through post-cure Product, post-cure can make rubber cross more perfect, removes the little molecule of residual, reduces material compression set；This The excellent physical properties of bright product, ageing-resistant, wear-resisting, closed performance is excellent.

The present invention utilizes silane coupler and titanate coupling agent that attapulgite is carried out dual hydrophobically modified, then coordinates breast Change the interpolation of Colophonium, make mixed-powder and add in rubber matrix, the hot strength of rubber matrix can not only be improved and pull Split percentage elongation, and enhance hydrophobicity；The sealing strip that the present invention makes can be used for the sealing of outdoor electrical switch cubicle, water proofing property Can be good, ageing-resistant performance is good.

Detailed description of the invention

The switch cubicle compound sealing strip that a kind of water resistance strengthens, is made up of the raw material of following weight portion (kilogram): three Unit EP rubbers 100, OMMT15, high density polyethylene (HDPE) 20, molybdenum bisuphide 7, polytetrafluoroethylene powder 2, DOP3, diphenyl peroxide first Acyl 0.2, maleic anhydride 4, Cosan 2.5, white carbon black 12,2 mercaptobenzimidazole 0.8, accelerator NS 0.3, emulsified asphalt 3, concavo-convex Rod stone 7, MTMS 0.6, isopropyl three (dioctylphyrophosphoric acid acyloxy) titanate esters 0.8, dehydrated alcohol are appropriate.

The switch cubicle compound sealing strip that described a kind of water resistance strengthens, is made up of step in detail below:

(1) high density polyethylene (HDPE) and DOP, molybdenum bisuphide, polytetrafluoroethylene powder are put in high speed mixer, with 1000 revs/min Speed mix 6 minutes, be then fed in double screw extruder, add dibenzoyl peroxide, maleic anhydride, be heated to 90 DEG C, extruding pelletization, obtain wear-resisting lubricating modification master batch；

(2) MTMS is mixed with isopropyl three (dioctylphyrophosphoric acid acyloxy) titanate esters, add total amount 2 times The dehydrated alcohol of amount, stirring is to being completely dissolved formation solution for later use；Attapulgite is pulverized, crosses 200 mesh sieves, with the nothing of 2 times amount Above-mentioned solution is added, with the Rate Dispersion 60 minutes of 1000 revs/min, sucking filtration, filter cake absolute ethanol washing 2 after water-ethanol mixing Mixing with emulsified asphalt after secondary, allow in ball mill, ball milling is put in vacuum drying oven after 30 minutes and is dried with the temperature of 60 DEG C, Obtain mixed-powder；

(3) by ethylene propylene diene rubber and OMMT in banbury mixing 8 minutes, keeping melting temperature is 130 DEG C, adds the most successively Enter mixed-powder, Cosan, white carbon black and remaining residual components that step (2) obtains, continue to be incubated mixing 10 minutes, discharging, Then it is pressed into thin slice through two-roll mill, obtains masterbatch；

(4) the lubricating modification master batch that step (1) obtains is put in twin-screw extruder, be heated to after abundant fusion plastification with step (3) the masterbatch mixing obtained, is then fed in single screw extrusion machine, control screw speed 30 revs/min, extruder temperature 90 DEG C, Make blend glue stuff extrude continuously, through 1000MHz microwave continuous vulcanization molding, after parking 24 hours in electric heating convection oven with The temperature of 150 DEG C vulcanizes 100 minutes, obtains the present invention.

Product of the present invention entered performance test, and the air transmission coefficient of more common EPT rubber packing bar reduces 28.0%, O.3MPa the water absorption rate after keeping 24h under hydraulic pressure reduces 13.9%, through 50000 circulation wet friction tests, is hardly visible mill Damage sign.

Claims (2)

1. the switch cubicle compound sealing strip that a water resistance strengthens, it is characterised in that be prepared by the raw materials in: Ethylene propylene diene rubber 100-105, OMMT15-17, high density polyethylene (HDPE) 20-22, molybdenum bisuphide 7-9, polytetrafluoroethylene powder 2-3, DOP3-4, dibenzoyl peroxide 0.2-0.22, maleic anhydride 4-5, Cosan 2.5-3, white carbon black 12-14,2-sulfydryl benzo miaow Azoles 0.8-1, accelerator NS 0.3-0.4, emulsified asphalt 3-4, attapulgite 7-8, MTMS 0.6-0.7, isopropyl Base three (dioctylphyrophosphoric acid acyloxy) titanate esters 0.8-1, dehydrated alcohol are appropriate.

The switch cubicle compound sealing strip that a kind of water resistance strengthens, it is characterised in that by following Concrete steps are made:

(1) high density polyethylene (HDPE) and DOP, molybdenum bisuphide, polytetrafluoroethylene powder are put in high speed mixer, with 1000-1200 Rev/min speed mix 6-8 minute, be then fed in double screw extruder, add dibenzoyl peroxide, maleic anhydride, add Hot to 90-100 DEG C, extruding pelletization, obtain wear-resisting lubricating modification master batch；

(2) MTMS is mixed with isopropyl three (dioctylphyrophosphoric acid acyloxy) titanate esters, add total amount 2-3 The dehydrated alcohol of times amount, stirring is to being completely dissolved formation solution for later use；Attapulgite is pulverized, crosses 200 mesh sieves, with 2-3 times amount Dehydrated alcohol mixing after add above-mentioned solution, with Rate Dispersion 60-90 minute of 1000-1200 rev/min, sucking filtration, filter cake is used Absolute ethanol washing mixes with emulsified asphalt for 2-3 time afterwards, allows in ball mill, and ball milling put into vacuum drying oven after 30-40 minute In be dried with the temperature of 60-70 DEG C, obtain mixed-powder；

(3) by ethylene propylene diene rubber and OMMT in banbury mixing 8-10 minute, melting temperature is kept to be 130-140 DEG C, so After be sequentially added into mixed-powder, Cosan, white carbon black and remaining residual components that step (2) obtains, continue to be incubated mixing 10-12 Minute, discharging, then it is pressed into thin slice through two-roll mill, obtains masterbatch；

(4) the lubricating modification master batch that step (1) obtains is put in twin-screw extruder, be heated to after abundant fusion plastification with step (3) the masterbatch mixing obtained, is then fed in single screw extrusion machine, controls screw speed 30-40 rev/min, extruder temperature 90- 100 DEG C, blend glue stuff is made to extrude continuously, through 1000-1500MHz microwave continuous vulcanization molding, at electric heating drum after parking 24 hours In wind baking oven, the temperature with 150-160 DEG C vulcanizes 100-120 minute, obtains the present invention.