CN103351495A - Mixed solvent resistant chloroprene rubber sealing pad and preparation method thereof - Google Patents

Abstract

The invention discloses a mixed solvent resistant chloroprene rubber sealing pad and a preparation method thereof. The sealing pad is made from such raw materials as chloroprene rubber (CR121), TPV (Thermoplastic Vulcanizate), polyethylene wax, zinc oxide, stearic acid, glycerol monostearate, dicumyl peroxide, N,N'-metabenzyl maleimide, 2.2'-benzothiazole disulfide, precipitated white carbon black 20-30, modified diatomite, calcium magnesium silicon whisker, and the like. According to the mixed solvent resistant chloroprene rubber sealing pad, the chloroprene rubber is mixed with polyethylene wax and TPV with excellent solvent resistance to obviously improve the mixed solvent resistance of the sealing pad and can simultaneously perfect such properties of the sealing pad as resilience, compression deformation resistance, environmental resistance, ageing resistance, etc. Such inorganic fillers as modified diatomite and calcium magnesium silicon whisker are further added in the rubber to improve the mechanical strength, ageing resistance and oil resistance of the sealing pad.

Description

A kind of neoprene packing of anti-mixed solvent pad and preparation method thereof

Technical field

The present invention relates to a kind of gasket and preparation method thereof, be specifically related to a kind of neoprene packing of anti-mixed solvent pad and preparation method thereof.

Background technology

Gasket material in the market, all not anti-mixed solvent (methylethylketone, toluene, oil, water) even select ethylene-propylene rubber(EPR) or viton gasket outside to coat which floor teflin tape, also can only be kept more than 20 days, solvent still infiltrates rubber, produces swelling, be full of cracks and ageing failure.

Summary of the invention

The object of the present invention is to provide a kind of neoprene packing of anti-mixed solvent pad and preparation method thereof, improve the anti-mixed solvent performance of gasket.

The technical solution used in the present invention is as follows:

A kind of neoprene packing of anti-mixed solvent pad, raw material by following weight part is made: chloroprene rubber (CR121) 55-65, TPV 20-30, polyethylene wax 10-15, zinc oxide 3-5, stearic acid 1-2, glyceryl monostearate 2-3, dicumyl peroxide 3-4, N, a N '-penylene maleimide 1-2,2.2'-curing Dibenzo thiazole 1-2, precipitated silica 20-30, modification infusorial earth 10-15, silicon magnesium calcium pyroborate 3-6, two-(the silica-based propyl group of γ-triethoxy) tetrasulfide 0.5-1, anti-aging agent RD 1-2, acceterator TE TD 1-2, accelerant NOBS 2-3.

Described modification infusorial earth is made by following methods: diatomite is put into the 10-15% hydrochloric acid soln soaked 1-2 hour, clean, then 120-140 ℃ of dry 8-12h at 440-460 ℃ of lower calcining 3-4h, take out, and porphyrize is smashed in cooling; Add again and be equivalent to the nano-sized carbon of diatomite weight 4-8%, the aluminium nitride of 3-6%, the Zirconium tetrafluoride of 2-3%, the polyisobutene of 3-4%, the ferrocene of 4-6%, 50-60 ℃ of mixed grinding 20-30min, and then spray into sec.-propyl three (dioctylphyrophosphoric acid acyloxy) titanic acid ester that is equivalent to diatomite weight 2-4% and the dimethyl silicone oil of 1-2%, stir 30-40min under 14000-16000 r/min, oven dry gets final product.

A kind of preparation method of the neoprene packing of anti-mixed solvent pad may further comprise the steps:

(1) with chloroprene rubber, polyethylene wax, modification infusorial earth, zinc oxide, precipitated silica, 2.2'-curing Dibenzo thiazole at 55-65 ℃ of lower pre-mixing 8-12min, get compound A;

(2) TPV, glyceryl monostearate, stearic acid, silicon magnesium calcium pyroborate, two-(the silica-based propyl group of γ-triethoxy) tetrasulfide are got compound B at 65-75 ℃ of lower pre-mixing 10-15min;

(3) send in the rubber mixing machine after compound A and compound B are mixed, add all the other raw materials at 80-90 ℃ of lower refining glue 18-22min;

(4) after refining glue is finished, take out sizing material and pave, send in the vulcanizing press at 160-170 ℃ of lower sulfuration 10-15min; Then the goods with sulfuration take out, and through the passer, can become finished product behind the finishing burr.

Beneficial effect of the present invention:

The present invention adopts chloroprene rubber and solvent resistance good polyethylene wax, TPV blend, can obviously improve the anti-mixed solvent performance of gasket, can also improve rebound resilience and the compression deformability of gasket simultaneously, anti-environment, ageing resistance etc.Also add the mineral fillers such as modification infusorial earth, silicon magnesium calcium pyroborate in the sizing material of the present invention, can improve physical strength, ageing resistance and the oil-proofness of gasket.The gasket good sealing effect that the present invention produces, high oil resistant, anti-mixed solvent, erosion resistance is good, energy long term operation in the media such as acid, alkali, oil, methylethylketone, toluene, its volume and changes in hardness are little, are difficult for swelling, be full of cracks; Also have the advantages such as good compression resilience, high thermal resistance, winter hardiness, Weather-resistant and ozone ageing performance.

Embodiment

A kind of neoprene packing of anti-mixed solvent pad, raw material by following weight (kg) is made: chloroprene rubber (CR121) 60, TPV 25, polyethylene wax 12, zinc oxide 4, stearic acid 1.5, glyceryl monostearate 2, dicumyl peroxide 3, N, a N '-penylene maleimide 1.5,2.2'-curing Dibenzo thiazole 2, precipitated silica 25, modification infusorial earth 12, silicon magnesium calcium pyroborate 5, two-(the silica-based propyl group of γ-triethoxy) tetrasulfide 0.6, anti-aging agent RD 1.5, acceterator TE TD 2, accelerant NOBS 2.

Described modification infusorial earth is made by following methods: diatomite is put into 15% hydrochloric acid soln soaked 1 hour, clean, then 140 ℃ of dry 8h at 450 ℃ of lower calcining 4h, take out, and porphyrize is smashed in cooling; Add again and be equivalent to the nano-sized carbon of diatomite weight 6%, 4% aluminium nitride, 2% Zirconium tetrafluoride, 3% polyisobutene, 5% ferrocene, 60 ℃ of mixed grinding 20min, and then spray into sec.-propyl three (dioctylphyrophosphoric acid acyloxy) titanic acid ester that is equivalent to diatomite weight 3% and 1.5% dimethyl silicone oil, stir 30min under 15000r/min, oven dry gets final product.

A kind of preparation method of the neoprene packing of anti-mixed solvent pad may further comprise the steps:

(1) with chloroprene rubber, polyethylene wax, modification infusorial earth, zinc oxide, precipitated silica, 2.2'-curing Dibenzo thiazole at 62 ℃ of lower pre-mixing 10min, get compound A;

(2) TPV, glyceryl monostearate, stearic acid, silicon magnesium calcium pyroborate, two-(the silica-based propyl group of γ-triethoxy) tetrasulfide are got compound B at 70 ℃ of lower pre-mixing 12min;

(3) send in the rubber mixing machine after compound A and compound B are mixed, add all the other raw materials at 85 ℃ of lower refining glue 20min;

(4) after refining glue is finished, take out sizing material and pave, send in the vulcanizing press at 165 ℃ of lower sulfuration 12min; Then the goods with sulfuration take out, and through the passer, can become finished product behind the finishing burr.

Gasket physicals of the present invention is as follows:

Claims (3)

1. the neoprene packing of anti-mixed solvent pad, it is characterized in that, raw material by following weight part is made: chloroprene rubber (CR121) 55-65, TPV 20-30, polyethylene wax 10-15, zinc oxide 3-5, stearic acid 1-2, glyceryl monostearate 2-3, dicumyl peroxide 3-4, N, a N '-penylene maleimide 1-2,2.2'-curing Dibenzo thiazole 1-2, precipitated silica 20-30, modification infusorial earth 10-15, silicon magnesium calcium pyroborate 3-6, two-(the silica-based propyl group of γ-triethoxy) tetrasulfide 0.5-1, anti-aging agent RD 1-2, acceterator TE TD 1-2, accelerant NOBS 2-3.

2. a kind of neoprene packing of anti-mixed solvent pad according to claim 1, it is characterized in that, described modification infusorial earth is made by following methods: diatomite is put into the 10-15% hydrochloric acid soln soaked 1-2 hour, clean, then 120-140 ℃ of dry 8-12h at 440-460 ℃ of lower calcining 3-4h, take out, porphyrize is smashed in cooling; Add again and be equivalent to the nano-sized carbon of diatomite weight 4-8%, the aluminium nitride of 3-6%, the Zirconium tetrafluoride of 2-3%, the polyisobutene of 3-4%, the ferrocene of 4-6%, 50-60 ℃ of mixed grinding 20-30min, and then spray into sec.-propyl three (dioctylphyrophosphoric acid acyloxy) titanic acid ester that is equivalent to diatomite weight 2-4% and the dimethyl silicone oil of 1-2%, stir 30-40min under 14000-16000 r/min, oven dry gets final product.

3. the preparation method of the neoprene packing of anti-a mixed solvent pad as claimed in claim 1 is characterized in that may further comprise the steps:

(1) with chloroprene rubber, polyethylene wax, modification infusorial earth, zinc oxide, precipitated silica, 2.2'-curing Dibenzo thiazole at 55-65 ℃ of lower pre-mixing 8-12min, get compound A;

(2) TPV, glyceryl monostearate, stearic acid, silicon magnesium calcium pyroborate, two-(the silica-based propyl group of γ-triethoxy) tetrasulfide are got compound B at 65-75 ℃ of lower pre-mixing 10-15min;

(3) send in the rubber mixing machine after compound A and compound B are mixed, add all the other raw materials at 80-90 ℃ of lower refining glue 18-22min;

(4) after refining glue is finished, take out sizing material and pave, send in the vulcanizing press at 160-170 ℃ of lower sulfuration 10-15min; Then the goods with sulfuration take out, and through the passer, can become finished product behind the finishing burr.