CN102977432A - High-flame-retardation chloroprene rubber sealing gasket and its preparation method - Google Patents

Abstract

The invention discloses a high-flame-retardation chloroprene rubber sealing gasket. The sealing gasket comprises the following raw materials, by weight, 135-145 parts of chloroprene rubber CR121, 10-15 parts of butyl rubber CBK139, 20-25 parts of chlorhydrin rubber H75, 10-20 parts of an SG-5 PVC resin, 3-5 parts of tri(2-ethylhexyl)acetocitrate, 3-5 parts of di(2-ethylhexyl)-4,5-epoxy tetrahydrophthalate and 1-2 parts of propylene glycol sebacate. The sealing gasket has the advantages of good high temperature resistance, good sealing performance, flame retardation grade reaching UL94-V0 or higher, good corrosion resistance, realization of long-term working in mediums comprising acids, alkalis, oil and the like, small volume and hardness changes, no adhesion on the metal surface, small friction coefficient, good abrasion resistance, good combination flexibility with a sealing surface, good weather ageing and ozone ageing resistances, durability and the like.

Description

A kind of high flame retardant neoprene packing pad and preparation method thereof

Technical field

The present invention relates to a kind of gasket, be specifically related to a kind of high flame retardant neoprene packing pad and preparation method thereof.

Background technology

Motor car engine need to seal local a lot, and condition is harsh, during engine work, temperature is very high, gasket will satisfy this requirement of heat-resistant fireproof at least, otherwise will affect the normal operation of engine.But along with the development of automotive industry, existing gasket far can not meet the demands, and often can be burnt, and therefore researching and developing a kind of high flame retardant gasket has become the task of top priority.

Summary of the invention

The objective of the invention is for the deficiencies in the prior art, a kind of high flame retardant neoprene packing pad and preparation method thereof is provided.

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

A kind of high flame retardant neoprene packing pad, the weight part of its constitutive material is: chloroprene rubber CR121 135-145, Isoprene-isobutylene rubber CBK13910-15, chlorohydrin rubber H75 20-25, SG-5 type polyvinyl chloride resin 10-20, acetyl tributyl citrate three (2-ethylhexyl) ester 3-5, epoxy tetrahydro-2-ethylhexyl phthalate 3-5, sebacic acid propanediol polyester 1-2, Polyoxyethylenated alcohol sodium sulfate1-2, sulphur 1-2, zinc oxide 3-5, calcium stearate 1-2, Zinc Stearate 1-2, zinc borate 5-10, nano-attapulgite 35-40, nanometer sepiolite 40-45, nano silicon 30-35, carbon black N339 10-20, precipitated silica 5-15, aluminate coupling agent DL-411 1-2, anti ultraviolet agent 0.1-1, linking agent TAIC 1-2,3-aminopropyl trimethoxysilane 1-2, anti-aging agent OD 1-2, anti-aging agent ODA 1-2, anti-aging agent TPPD 1-2, accelerant N a-22 1-2, altax 3-4, modification trees ashes 1-2.

Described modification trees ashes are made by following methods: extremely neutral with deionized water wash again after using first 10-15% hydrogen peroxide dipping trees ashes 2-3h, and oven dry; Add and be equivalent to the nano-sized carbon of trees ashes weight 2-3%, the polyisobutene of 1-2%, the tributyl citrate of 2-3%, the ferrocene of 1-2%, the aluminium hydroxide of 3-5%, high speed 4500-4800r/min stirs 20-30min, and ovendry power is broken into ultrafine powder.

The preparation method of high oil resistant neoprene packing pad may further comprise the steps:

(1) press above-mentioned formulation ratio, the raw material for preparing is sent into refined glue in the rubber mixing machine, glue furnacing temperature is controlled at 80-90 ℃, and the refining glue time is 15-20min;

(2) after refining glue is finished, the taking-up sizing material is paved, after placing at normal temperatures cooling 36-48h, send into and carry out twice sulfuration in the vulcanizing press, the curing temperature of primary vulcanization is controlled at 165-175 ℃, and curing time is 20-30min, and primary vulcanization vulcanizes the second time by complete and then carrying out, for the second time sulfuration is 210-220 ℃, and curing time is 5-6 minute;

(3) goods that will finish sulfuration take out, and through the passer, can become finished product behind the finishing burr.

Beneficial effect of the present invention:

The present invention can improve flame retardant resistance and the erosion resistance of gasket by the trees ashes are carried out modification, and it is low to have a cost, the characteristics that effect is good.Add the inorganic powder fillers such as nano-attapulgite, nanometer sepiolite, nano silicon, precipitated silica among the present invention, can increase substantially the flame retardant properties of chloroprene rubber.Gasket of the present invention has good resistance to elevated temperatures, good sealing property, flame retardant rating reaches UL94-V0 or higher; Corrosion resistance is good, in acid, and alkali, energy long term operation in the wet goods medium, its volume and changes in hardness are little, and do not stick on the metallic surface; Frictional coefficient is little, and wear resistance is good; Has the flexibility of being combined with trim; The advantages such as Weather-resistant and ozone ageing performance are good, and be durable in use.

Embodiment

The present invention is further illustrated below in conjunction with specific embodiment.

Embodiment

A kind of high flame retardant neoprene packing pad, the weight part of its constitutive material is: 140 parts of chloroprene rubber CR121, Isoprene-isobutylene rubber CBK13912 parts, 22 parts of chlorohydrin rubber H75,16 parts of SG-5 type polyvinyl chloride resins, 4 parts of acetyl tributyl citrate three (2-ethylhexyl) esters, 4 parts of epoxy tetrahydro-2-ethylhexyl phthalates, 2 parts of sebacic acid propanediol polyesters, Polyoxyethylenated alcohol sodium sulfate2 parts, 1.5 parts in sulphur, 4 parts in zinc oxide, 2 parts of calcium stearates, 1 part of Zinc Stearate, 8 parts of zinc borates, 36 parts of nano-attapulgites, 42 parts of nanometer sepiolites, 30 parts of nano silicons, 15 parts of carbon black N339,8 parts of precipitated silicas, 1.5 parts of aluminate coupling agent DL-411,0.6 part of anti ultraviolet agent, 1.6 parts of linking agent TAIC, 1.5 parts of 3-aminopropyl trimethoxysilane, 1.5 parts of anti-aging agent OD, 1 part of anti-aging agent ODA, 1.5 parts of anti-aging agent TPPD, 2 parts of accelerant N a-22,3 parts of altaxs, 2 parts in modification trees ashes.

Wherein, described modification trees ashes are made by following methods: extremely neutral with deionized water wash again after using first 12% hydrogen peroxide dipping trees ashes 3h, and oven dry; Add and be equivalent to the nano-sized carbon of trees ashes weight 3%, 2% polyisobutene, 2% tributyl citrate, 1.5% ferrocene, 4% aluminium hydroxide, high speed 4500r/min stirs 30min, and ovendry power is broken into ultrafine powder.

The preparation method of high oil resistant neoprene packing pad may further comprise the steps:

(1) press above-mentioned formulation ratio, the raw material for preparing is sent into refined glue in the rubber mixing machine, glue furnacing temperature is controlled at 85 ℃, and the refining glue time is 20min;

(2) after refining glue is finished, the taking-up sizing material is paved, after placing at normal temperatures cooling 48h, send into and carry out twice sulfuration in the vulcanizing press, the curing temperature of primary vulcanization is controlled at 168 ℃, curing time 30min, and primary vulcanization vulcanizes the second time by complete and then carrying out, sulfuration is 215 ℃ for the second time, and curing time is 5-6 minute;

(3) goods that will finish sulfuration take out, and through the passer, can become finished product behind the finishing burr.

The tensile property of the gasket that present embodiment prepares, wear hardness and flame retardant resistance see the following form 1.

Table 1

Claims (3)

1. high flame retardant neoprene packing pad, it is characterized in that the weight part of its constitutive material is: chloroprene rubber CR121 135-145, isoprene-isobutylene rubber CBK139 10-15, chlorohydrin rubber H75 20-25, SG-5 type polyvinyl chloride resin 10-20, acetyl tributyl citrate three (2-ethylhexyl) ester 3-5, epoxy tetrahydro-2-ethylhexyl phthalate 3-5, sebacic acid propanediol polyester 1-2, polyoxyethylenated alcohol sodium sulfate 1-2, sulphur 1-2, zinc oxide 3-5, calcium stearate 1-2, Zinc Stearate 1-2, zinc borate 5-10, nano-attapulgite 35-40, nanometer sepiolite 40-45, nano silicon 30-35, carbon black N339 10-20, precipitated silica 5-15, aluminate coupling agent DL-411 1-2, anti ultraviolet agent 0.1-1, linking agent TAIC 1-2,3-aminopropyl trimethoxysilane 1-2, anti-aging agent OD 1-2, anti-aging agent ODA 1-2, anti-aging agent TPPD 1-2, accelerant N a-22 1-2, altax 3-4, modification trees ashes 1-2.

2. high flame retardant neoprene packing pad according to claim 1 is characterized in that, described modification trees ashes are made by following methods: extremely neutral with deionized water wash again after using first 10-15% hydrogen peroxide dipping trees ashes 2-3h, and oven dry; Add and be equivalent to the nano-sized carbon of trees ashes weight 2-3%, the polyisobutene of 1-2%, the tributyl citrate of 2-3%, the ferrocene of 1-2%, the aluminium hydroxide of 3-5%, high speed 4500-4800r/min stirs 20-30min, and ovendry power is broken into ultrafine powder.

3. the preparation method of a high oil resistant neoprene packing pad as claimed in claim 1 is characterized in that may further comprise the steps:

(1) press above-mentioned formulation ratio, the raw material for preparing is sent into refined glue in the rubber mixing machine, glue furnacing temperature is controlled at 80-90 ℃, and the refining glue time is 15-20min;

(2) after refining glue is finished, the taking-up sizing material is paved, after placing at normal temperatures cooling 36-48h, send into and carry out twice sulfuration in the vulcanizing press, the curing temperature of primary vulcanization is controlled at 165-175 ℃, and curing time is 20-30min, and primary vulcanization vulcanizes the second time by complete and then carrying out, for the second time sulfuration is 210-220 ℃, and curing time is 5-6 minute;

(3) goods that will finish sulfuration take out, and through the passer, can become finished product behind the finishing burr.