CN1061288C

CN1061288C - Improved method for prodn. foams of or artificial rubber

Info

Publication number: CN1061288C
Application number: CN95100602A
Authority: CN
Inventors: 陈晴祺
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-01-05
Filing date: 1995-01-05
Publication date: 2001-01-31
Anticipated expiration: 2015-01-05
Also published as: CN1126135A

Abstract

The present invention relates to an improved making method for rubber or artificial rubber foaming bodies, which comprises the following steps: step 1, the main materials of rubber or mixtures of rubber and plastic cement, a predetermined amount of filling materials, chemical foaming agents, stiffening agents, plasticizers, accelerating agents, stabilizing agents, etc. are evenly mixed, wherein the foam formation temperature of the foaming agents is higher than the curing temperature of the rubber; step 2, the mixed materials in step 1 are put and filled in a mould cavity of a molding mould; according to the actual shape and size of a foaming body to be formed and the multiplying power to be foamed, the mould cavity is made through reduction; the mould is heated to enable the rubber materials in the mould cavity to be formed by slaking, and the rubber materials do not foam; step 3, the formed rubber body without foaming in step 2 is put in an oven, and is heated to enable the foaming agents in the rubber body to generate chemical change and gas to form a rubber foaming body through distension.

Description

The improved preparation of rubber or artificial rubber foaming body

The present invention system is about the improved preparation of a kind of rubber or artificial rubber foaming body.

Rolling is rubbed with batching blending such as rubber major ingredient and blowing agent, curing agent, fillers earlier by the method for known manufacturing bipeltate or artificial rubber system, make and be uniformly dispersed, get the compound of scheduled volume then and insert in the die cavity, heating is bubbled blowing agent and is supportted the rubber bodies that expands, and makes its sclerosis typing of building bridge.Above-mentioned molding mass need be made preparation formed body 11 before inserting die cavity, shown in first figure.This formed body 11 bottom surfaces 111 must can be closely connected with bed die 12 die cavitys, can remaining bubble during storing.Cover backform 13 back heating formed body 11 is expanded, the air in the die cavity is discharged by steam vent or spue line.Or shown in second figure, preparation formed body 14 top, bottom surface 141,142 all can to push up the bottom surface closely connected with die cavity, air can be discharged smoothly during in order to do matched moulds, can not remain in the die cavity, cause the rubber pange surface to form recess.

The shortcoming of commonly using the bipeltate method for making is:

1. it is to mold heated blowing agent to be bubbled earlier, will be as yet not the rubber mixture of slaking expand and be full of die cavity, continue then mold heated, make rubber mixture slaking typing, the time that therefore cooling and shaping still must be arranged after the mold pressing hot briquetting, be out of shape because of the inner bulbs of pressure with foamed rubber after preventing die sinking, its required molding time is more of a specified duration, and production capacity is lower.

2. its coefficient of foaming is little, can't do powerful foaming.Rubber not slaking as yet during because of foaming, if desire to do the high magnification foaming, then the gas flow of blowing agent generation needs big, gas flow press to increase in greatly then, and rubber mixture is slaking pre-structure undercapacity not as yet, and gas may be overflowed outside the rubber bodies, cause blow weak, bad phenomenon such as product perforation.

3. need blending to rub and roll over the formality of preparing burden and preparing moulding, need more artificial and man-hour.

The present invention's purpose aims to provide the improved preparation of a kind of rubber or artificial rubber foaming body, and its required curing time is shorter, production capacity the higher person.

Still a further object of the present invention is at the improved preparation that a kind of rubber or artificial rubber foaming body are provided, and it can produce the foamed rubber person than high magnification.

Another purpose of the present invention is at the improved preparation that a kind of rubber or artificial rubber foaming body are provided, its man-hours requirement and cost of labor junior.

For reaching above-mentioned purpose, according to a kind of rubber provided by the present invention or the improved preparation of artificial rubber foaming body, include the following step: step 1, the major ingredient that rubber or rubber are mixed with plastic cement and inserts, CBA, curing agent, plasticizer, promoter and the stabilization agent etc. of scheduled volume mix; Wherein the nucleation temperature of blowing agent must be higher than the rubber curing temperature; Step 2, one of mould die cavity is inserted and filled up to the compound of step 1, this die cavity system is according to desire moulding foaming body true form size, and according to desire expansion ratio and dwindle manufacturing, to mold heated the rubber slaking in the die cavity is finalized the design, but not foaming, the heating-up temperature of wherein said mould is 110-130 ℃, and be 2-7 minute heat time heating time; Step 3, with step 2 slaking typing but the rubber bodies of foaming is not put into baking box, and heating makes the blowing agent in the rubber bodies play chemical change and produces gas, and the formation foamed rubber that expands.

Now be illustrated in the back for two embodiment:

The 3rd figure is the processing procedure schematic diagram of first embodiment.

The 4th figure is the processing procedure schematic diagram of second embodiment.

See also shown in the 3rd figure, first embodiment of the invention includes the following step:

Step 1, the major ingredient that rubber or rubber are mixed with plastic cement, inserts, CBA, curing agent, plasticizer, promoter and the stabilization agent of mix predetermined quantities are rubbed rolling through the roll-in of running roller machine, raw material is fully mixed and be uniformly dispersed.Wherein the nucleation temperature of this CBA is about 150 ℃.

Step 2, the compound 21 of getting the scheduled volume step 1 are inserted in the die cavity 23 of a molding tool 22.This die cavity 23 is according to desire moulding foaming body true form size, and according to desire expansion ratio and dwindle manufacturing.Matched moulds makes compound 21 be full of whole die cavity 23, and mould 22 is heated to 110-120 ℃, approximately through 5-7 minute, makes rubber mixture 21 slakings typing form rubber bodies 24, but not foaming.

Step 3, with step 2 slaking typing but the rubber bodies 24 of not foaming is put into baking box (Oven) 25, be heated to 160-200 ℃, preferable with 180 ℃ approximately through 4-8 minute, preferable with about 6 minutes, make the blowing agent in the rubber bodies play chemical change generation gas, form the rubber foam 26 that tool is set shape and size and expand naturally.

See also shown in the 4th figure, second embodiment of the invention includes the following step:

Step 1, the major ingredient that rubber or rubber are mixed with plastic cement, and inserts, CBA, curing agent, plasticizer, promoter and the stabilization agent etc. of scheduled volume mix in the cylinder body of ejaculator 31 evenly.Wherein the nucleation temperature of this CBA is about 150 ℃, and the temperature of ejaculator cylinder body is located at about 60-90 ℃.

Step 2, with in the step 1 mixing the material inject in the die cavity 33 of a mould 32.This die cavity 33 also is that shape and the expansion ratio according to the actual production article dwindles manufacturing.The temperature maintenance of this mould 32 approximately through 120-150 second, treats that rubber slaking typing forms rubber bodies 34 (foaming as yet) about 120-130 ℃, this rubber bodies 34 is taken out in die sinking.

Step 3, this rubber bodies 34 inserted in the baking box 35 be heated to 180 ℃, approximately through about 6 minutes, make blowing agent in the rubber bodies 34 play chemical change and produce gas, form the foamed rubber 36 of tool setting shape and size and expand naturally.

The present invention's rubber can make NR (Natural Rubber) or IR (Synthetic Polyis-oprene) or SBR (Styrene-Butadiene Rubbers) or BR (Polybutadiene Ru-bbers) or IIR (Butyl Rubber) or BIIR (Bromobutyl Rubber) or CIIR (Chl-orobutyl Rubbers) or CR (The Neoprenes) or EPDM (Ethylene PropyleneRubbers) or NBR (Nitrile Elastomers) or ACM (Polyacrylic Rubbrs) or T (Polysulfide polymers) or MQ (Silicone Elastomers).

CBA (Chemical Blowing Agents) can use DTP (Dinitrosope-ntamehtylenetetramine) or AZC (Azodicarbonamide or Azobisformani-de) or TSH (P-Toluene Sulfonylhydrazide) or OBSH (4.4 '-Oxybis orBenzene Sulfonylhydrazide).The nucleation temperature of CBA is selected 130 ℃ of-200 ℃ of scopes for use, and is preferable with 150 ℃ of-180 ℃ of left and right sides.

Filler can use carbon black (Carbon Black) or talcum powder or calcium carbonate (Caco).

Plasticizer (Processing Oil) can use Aromatic oil or Naphthemic oil or Paraffinic oil or Phthalates.

Promoter (Accelerators) can use Guanidines (DPG) or Thiazoles (MBT, DMBT ...) or Thiurams (DPTT, TET ...) or Dithiocarbamates (EZ, BZ ...) or Thioureas (NA-22 ...).

If major ingredient is with the rubber mix plastic cement, and then rubber content accounts for 10%-95%, and plastic cement accounts for 5%-90%.For example mix 30% PVC with 70% NBR.

The present invention's advantage is that the curing time is reduced to the 20%-30% that commonly uses. Because mould adds Heat make need not to commonly use for another example after the rubber slaking as cooling make its solid type, so mould can remain on and establishes Continued operation in the fixed temperature scope does not have the time and the energy charge that heavily cover heating and cooling. And to penetrate Going out mode is example, raw material in penetrating cylinder namely by continuous heating, when its material sputtering nozzle by ejaculator During ejaculation, temperature can reach about 90 ℃, and is directly to inject the mould temperature about 120-130 ℃ Mould in, the temperature that shoots material rises and slaking at once, so the required curing time only needs 120-Get final product about 130 ℃ of seconds, throughput rate is exceedingly fast.

Max line expansion ratio of the present invention can reach 3 times, commonly also can reach about 1.8 times, so foaming Expanding volume can be more than 5 times.

The accompanying drawing simple declaration:

The schematic diagram that rubber mixture is placed in die cavity is commonly used by first and second figure system.

Claims

1. the improved preparation of rubber or artificial rubber foaming body includes the following step:

Step 1, the major ingredient that rubber or rubber are mixed with plastic cement and inserts, CBA, curing agent, plasticizer, promoter and the stabilization agent etc. of scheduled volume mix; Wherein the nucleation temperature of blowing agent must be higher than the rubber curing temperature;

Step 2, one of mould die cavity is inserted and filled up to the compound of step 1, this die cavity system is according to desire moulding foaming body true form size, and desires expansion ratio and dwindle manufacturing according to institute, to mold heated the rubber mass slaking in the die cavity is finalized the design, but foam;

Step 3, with step 2 slaking typing but the rubber bodies of foaming is not put into baking box, and heating makes the blowing agent in the rubber bodies play chemical change and produces gas, and the formation foamed rubber that expands.

2. according to the described rubber of claim 1 or the improved preparation of artificial rubber foaming body, wherein the heating-up temperature of step 2 mould is 110-130 ℃, and be 2-7 minute heat time heating time.

3. according to the described rubber of claim 1 or the improved preparation of artificial rubber foaming body, wherein the heating-up temperature of step 3 baking box is 160-200 ℃, and be 4-8 minute heat time heating time.

4. according to the described rubber of claim 3 or the improved preparation of artificial rubber foaming body, wherein the heating-up temperature of step 3 baking box is 180 ℃.

5. according to the described rubber of claim 3 or the improved preparation of artificial rubber foaming body, wherein be 6 minutes the heat time heating time of step 3 baking box.

6. according to the described rubber of claim 1 or the improved preparation of artificial rubber foaming body, wherein the nucleation temperature of this CBA is 130-200 ℃.

7. according to the described rubber of claim 1 or the improved preparation of artificial rubber foaming body, wherein the nucleation temperature of this CBA is 150-180 ℃.