CN116855003A - Butyronitrile rubber-based composite material for pneumatic nailing gun buffer cushion and preparation method thereof - Google Patents
Butyronitrile rubber-based composite material for pneumatic nailing gun buffer cushion and preparation method thereof Download PDFInfo
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- CN116855003A CN116855003A CN202310856172.8A CN202310856172A CN116855003A CN 116855003 A CN116855003 A CN 116855003A CN 202310856172 A CN202310856172 A CN 202310856172A CN 116855003 A CN116855003 A CN 116855003A
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 63
- 239000005060 rubber Substances 0.000 title claims abstract description 63
- 239000002131 composite material Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- KVNRLNFWIYMESJ-UHFFFAOYSA-N butyronitrile Chemical compound CCCC#N KVNRLNFWIYMESJ-UHFFFAOYSA-N 0.000 title abstract description 4
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 65
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 65
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 45
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 39
- 239000006185 dispersion Substances 0.000 claims abstract description 35
- 239000004014 plasticizer Substances 0.000 claims abstract description 34
- 239000006229 carbon black Substances 0.000 claims abstract description 26
- 150000001875 compounds Chemical class 0.000 claims abstract description 24
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 18
- MIMDHDXOBDPUQW-UHFFFAOYSA-N dioctyl decanedioate Chemical compound CCCCCCCCOC(=O)CCCCCCCCC(=O)OCCCCCCCC MIMDHDXOBDPUQW-UHFFFAOYSA-N 0.000 claims abstract description 14
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 9
- 239000004200 microcrystalline wax Substances 0.000 claims abstract description 9
- 235000019808 microcrystalline wax Nutrition 0.000 claims abstract description 9
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 9
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000008117 stearic acid Substances 0.000 claims abstract description 9
- 239000011787 zinc oxide Substances 0.000 claims abstract description 9
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000004073 vulcanization Methods 0.000 claims description 19
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 17
- 229910052717 sulfur Inorganic materials 0.000 claims description 17
- 239000011593 sulfur Substances 0.000 claims description 17
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 claims description 15
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 10
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 8
- 239000003963 antioxidant agent Substances 0.000 claims description 7
- 239000002109 single walled nanotube Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 4
- 230000003078 antioxidant effect Effects 0.000 claims description 4
- 238000007720 emulsion polymerization reaction Methods 0.000 claims description 3
- 239000012046 mixed solvent Substances 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 150000004996 alkyl benzenes Chemical group 0.000 claims description 2
- 229940077388 benzenesulfonate Drugs 0.000 claims description 2
- 238000007668 thin rolling process Methods 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims 5
- RNPXCFINMKSQPQ-UHFFFAOYSA-N dicetyl hydrogen phosphate Chemical compound CCCCCCCCCCCCCCCCOP(O)(=O)OCCCCCCCCCCCCCCCC RNPXCFINMKSQPQ-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 19
- 238000013016 damping Methods 0.000 abstract description 4
- 238000010058 rubber compounding Methods 0.000 abstract description 2
- 238000013040 rubber vulcanization Methods 0.000 abstract description 2
- 238000003801 milling Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 28
- DEQZTKGFXNUBJL-UHFFFAOYSA-N n-(1,3-benzothiazol-2-ylsulfanyl)cyclohexanamine Chemical compound C1CCCCC1NSC1=NC2=CC=CC=C2S1 DEQZTKGFXNUBJL-UHFFFAOYSA-N 0.000 description 15
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
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- 238000007906 compression Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- -1 alkyl sulfonate phenyl ester Chemical class 0.000 description 2
- 238000010556 emulsion polymerization method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- DFWCPLGXFMSUCW-UHFFFAOYSA-N 3-(dimethylamino)propyl carbamimidothioate;hydron;dichloride Chemical compound Cl.Cl.CN(C)CCCSC(N)=N DFWCPLGXFMSUCW-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002589 poly(vinylethylene) polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a nitrile rubber base composite material for a cushion pad of a pneumatic nailing gun and a preparation method thereof, belonging to the field of rubber compounding and vulcanization. The composite material comprises the following raw materials: nitrile rubber, carbon black, carbon nanotube pre-dispersion, reactive plasticizer, zinc oxide, vulcanizing agent, anti-aging agent, stearic acid, microcrystalline wax and dioctyl sebacate. The specific method comprises the following steps: mixing nitrile rubber, carbon black, carbon nano tube pre-dispersion, reactive plasticizer, zinc oxide, anti-aging agent, stearic acid, microcrystalline wax and dioctyl sebacate, banburying, and then adding vulcanizing agent for open milling to obtain a rubber compound; and performing, and finally vulcanizing to obtain the butyronitrile rubber-based composite material. The material prepared by the invention has higher modulus, definite elongation, tear strength and high temperature resistance, thereby improving the high impact resistance of rubber products, enabling the prepared product to adapt to the damping working condition with larger impact energy, and further meeting the high impact resistance and damping use requirement of pneumatic nailing guns.
Description
Technical Field
The invention belongs to the technical field of rubber compounding and vulcanization, and particularly relates to a nitrile rubber base composite material for a cushion pad of a pneumatic nailing gun and a preparation method thereof.
Background
Nitrile rubber (NBR) is mainly produced by adopting a low-temperature emulsion polymerization method, and has the advantages of excellent oil resistance, higher wear resistance, better heat resistance and strong adhesive force. The material is widely used for preparing various oil-resistant rubber products, oil-resistant gaskets, sleeves, flexible packages, flexible hoses, printing and dyeing rubber rollers, cable rubber materials and the like, and becomes an essential elastic material in various industries such as automobiles, aviation, petroleum, copying and the like. However, nitrile rubbers also have some disadvantages: the low temperature resistance and ozone resistance are poor, the insulating property is poor, and the elasticity is low.
At present, nitrile rubber (NBR) is widely used in the shock absorbing industry, and has increasingly severe application performance, such as in the preparation of pneumatic nailing guns. However, the investigation shows that the traditional matched rubber product can only meet the working condition of low-energy shock absorption requirement, and is difficult to meet the working condition of high-frequency and high-energy impact. Therefore, how to overcome the above drawbacks, the preparation of a nitrile rubber composite material with high impact properties is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a nitrile rubber base composite material for a cushion pad of a pneumatic nailing gun and a preparation method thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a nitrile rubber base composite material for a cushion pad of a pneumatic nailing gun, which comprises the following raw materials in parts by weight: 100 parts of nitrile rubber, 60-120 parts of carbon black, 3-10 parts of carbon nano tube pre-dispersion, 5-20 parts of reactive plasticizer, 2-10 parts of zinc oxide, 3-6 parts of vulcanizing agent, 1-5 parts of anti-aging agent, 1-2 parts of stearic acid, 1 part of microcrystalline wax and 0-5 parts of dioctyl sebacate.
The beneficial effects are that: the invention selects a plurality of substances to combine and match, improves the modulus, the tearing strength and the fatigue resistance of the composite material, thereby realizing the high-frequency and high-energy impact resistant effect of the product.
Further, the Mooney viscosity of the nitrile rubber at the temperature of ML1+10 and 100 ℃ is more than or equal to 70; the nitrile rubber is prepared by emulsion polymerization of butadiene and acrylonitrile in the ratio of (75-60) to (25-40).
The beneficial effects are that: according to the invention, the nitrile rubber with the Mooney viscosity of more than or equal to 70 is selected, so that the mechanical and technological properties of the nitrile rubber base composite material can be further improved; if the Mooney viscosity is too low, the fluidity of the sizing material is too strong, and further the phenomena of bubbles and the like of the product are caused.
Further, the preparation method of the carbon nano tube pre-dispersion comprises the following steps: and mechanically mixing and dispersing the carbon nano tubes in a carrier to obtain the carbon nano tube pre-dispersion.
Wherein the carbon nanotubes are single-walled carbon nanotubes, the content of which is 5wt.% of the carbon nanotube pre-dispersion.
The diameter of the single-wall carbon nano tube is 1.2-2.0nm, and the length is 5 mu m.
The carrier is a mixed solvent of nitrile rubber and environment-friendly plasticizer in a mass ratio of 24:71.
Wherein the environment-friendly plasticizer is alkyl benzene sulfonate.
The beneficial effects are that: the carbon nano tube pre-dispersion is added in the preparation of the nitrile rubber-based composite material, so that the modulus and the tearing strength of the composite material can be improved.
Further, the carbon black is any one of carbon black N550 and carbon black N774 or the combination of the carbon black and the carbon black in any proportion; the reactive plasticizer is any one or the combination of any two of B-2000 and B-3000 (liquid 1,2 polybutadiene) in any proportion, so that the reactive plasticizer can play a role in plasticizer during banburying and in the initial stage of vulcanization, and can play a role in hardening after vulcanization; the vulcanizing agent is any one or a mixture of more than one of DCP (dicumyl peroxide), sulfur, TMTD (tetramethylthiuram disulfide), CBS (N-cyclohexyl-2-benzothiazole sulfenamide) and MBTS (dibenzothiazyl disulfide) in any proportion; the antioxidant is any one or mixture of several of antioxidants MB, RD and MBZ in any proportion.
The invention also provides a preparation method of the nitrile rubber base composite material for the cushion pad of the pneumatic nailing gun, which comprises the following steps:
(1) Performing primary banburying on the nitrile rubber, and then adding the carbon black, the carbon nano tube pre-dispersion, the reactive plasticizer, the zinc oxide, the anti-aging agent, stearic acid, microcrystalline wax and dioctyl sebacate for secondary banburying to obtain a rubber compound without a vulcanizing agent;
(2) Adding the vulcanizing agent into the rubber compound without the vulcanizing agent, and carrying out open mixing to obtain the rubber compound containing the vulcanizing agent;
(3) Preforming the rubber compound containing the sulfonating agent by a preforming machine to obtain rubber blanks;
(4) And vulcanizing the rubber blank to obtain the nitrile rubber base composite material for the cushion pad of the pneumatic nailing gun.
Further, the time of the primary banburying in the step (1) is 20-120s, the pressure is 0.5-0.6MPa, and the temperature is 85 ℃;
the secondary banburying time is 60-240s, and the banburying temperature is 130-160 ℃.
Further, the specific process of the open mill in the step (2) is as follows: firstly, adding the rubber compound without the vulcanizing agent into a roll coating in an open mill, adding the vulcanizing agent after forming smooth roll coating rubber, cutting left and right for 8 times, and discharging sheets after triangular coating, thin pass and rolling after the vulcanizing agent is completely eaten into rubber to obtain the rubber compound containing the vulcanizing agent;
wherein the times of triangle packing and thin pass are 5 times; the thin pass is a thin pass with a roll gap of 0.5-1 mm; the number of times of rolling is 3, and the roll gap is 3-4mm; the thickness of the film is 3-4mm when the film is discharged.
Further, the preforming process of the preforming machine in the step (3) is as follows: preheating and rolling the mixed rubber containing the vulcanizing agent at the temperature of 60-90 ℃, and extruding the mixed rubber into rubber blanks required by vulcanization at the temperature of 60-75 ℃ under the pressure of 8-15 MPa.
Further, the vulcanizing in the step (4) is: and (3) performing twice vulcanization on a 50-ton plate vulcanizing machine, wherein the primary vulcanization temperature is 150-170 ℃, the time is 500-1500s, and the secondary vulcanization temperature is 150-170 ℃ and the time is 1800s.
Compared with the prior art, the invention has the following beneficial effects:
according to the technical scheme, the carbon nano tube, the vulcanizing agent and the reactive plasticizer are added into the formula of the nitrile-based composite material, so that the modulus, the stretching strength, the tearing strength and the high-temperature resistance of the material are further improved, the high-impact resistance of a rubber product is improved, the prepared product can adapt to the damping working condition with larger impact energy, and the high-impact damping use requirement of a pneumatic nailing gun can be further met.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples of the present invention are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The invention provides a nitrile rubber base composite material for a cushion pad of a pneumatic nailing gun, which comprises the following raw materials in parts by weight: 100 parts of nitrile rubber, 60-120 parts of carbon black (preferably 100 parts), 3-10 parts of carbon nano tube pre-dispersion (preferably 5 parts), 5-20 parts of reactive plasticizer (preferably 5 parts), 2-10 parts of zinc oxide (preferably 6 parts), 3-6 parts of vulcanizing agent (preferably 5 parts), 1-5 parts of anti-aging agent (preferably 3 parts), 1-2 parts of stearic acid (preferably 1 part), 1 part of microcrystalline wax and 0-5 parts of dioctyl sebacate (preferably 0 part).
Further, the Mooney viscosity of the nitrile rubber at the temperature of ML1+10 and 100 ℃ is more than or equal to 70; the nitrile rubber is prepared by emulsion polymerization of butadiene and acrylonitrile in the ratio of 75-60 to 25-40, preferably 72:28.
Further, the preparation method of the carbon nano tube pre-dispersion comprises the following steps: and mechanically mixing and dispersing the carbon nano tubes in a carrier to obtain the carbon nano tube pre-dispersion.
Wherein the carbon nanotubes are single-walled carbon nanotubes, the content of which is 5wt.% of the carbon nanotube pre-dispersion; the diameter of the single-wall carbon nano tube is 1.2-2.0nm, and the length is 5 mu m.
The carrier is a mixed solvent of nitrile rubber and environment-friendly plasticizer in the mass ratio of 24:71.
Wherein the environment-friendly plasticizer is alkyl sulfonate phenyl ester.
Further, the carbon black is any one of carbon black N550 and carbon black N774 or the combination of the carbon black N550 and the carbon black N774 in any proportion, and preferably the carbon black N550 and the carbon black N774 are mixed in a weight ratio of 1:1; the reactive plasticizer is any one or the combination of any proportion of B-2000 and B-3000, preferably B-3000, so that the reactive plasticizer can play a role of plasticizer in banburying and in the initial stage of vulcanization and can play a role of hardening after vulcanization; the vulcanizing agent is any one or mixture of more of DCP, sulfur, TMTD, CBS and MBTS in any proportion; the antioxidant is one or more of antioxidants MB, RD and MBZ, preferably MB and RD mixed in a ratio of 1:2.
The invention also provides a preparation method of the nitrile rubber base composite material for the cushion pad of the pneumatic nailing gun, which comprises the following steps:
(1) Performing primary banburying on nitrile rubber, and then adding the carbon black, the carbon nano tube pre-dispersion, the reactive plasticizer, zinc oxide, the anti-aging agent, stearic acid, microcrystalline wax and dioctyl sebacate for secondary banburying to obtain a rubber compound without a vulcanizing agent;
(2) Adding the vulcanizing agent into the rubber compound without the vulcanizing agent, and carrying out open mill to obtain the rubber compound containing the vulcanizing agent;
(3) Preforming the rubber compound containing the vulcanizing agent by a preforming machine to obtain rubber blanks;
(4) And vulcanizing the rubber blank to obtain the butyronitrile rubber base composite material for the cushion pad of the pneumatic nailing gun.
Further, the time of one-time banburying in the step (1) is 20-120s, preferably 40s, the pressure is 0.5-0.6MPa, and the temperature is 85 ℃;
the secondary banburying time is 60-240s, preferably 200s, and the banburying temperature is 130-160 ℃, preferably 130 ℃.
Further, the specific process of open mill in the step (2) is as follows: firstly, adding a rubber compound without a vulcanizing agent into a roll wrapping machine, adding the vulcanizing agent after forming smooth roll wrapping rubber, cutting left and right for 8 times, and discharging the rubber compound containing the vulcanizing agent after triangular wrapping and thin rolling after the vulcanizing agent is completely eaten into rubber;
wherein, the times of triangle packing and thin pass are 5 times; the thin pass is a thin pass with a roll gap of 0.5-1 mm; the number of times of rolling is 3; the thickness of the film is 3-4mm when the film is discharged.
Further, the preforming specific process of the preforming machine in the step (3) is as follows: preheating and rolling the rubber compound containing the vulcanizing agent at the temperature of 60-90 ℃, and extruding the rubber compound into rubber blanks required by vulcanization at the pressure of 8-15MPa and the temperature of 60-75 ℃, wherein the pressure is preferably 12MPa and the temperature is 75 ℃.
Further, the specific process of vulcanization in the step (4) is as follows: the two times of vulcanization are carried out on a 50-ton plate vulcanizing machine, wherein the primary vulcanization temperature is 150-170 ℃, the time is 500-1500s, the temperature is preferably 170 ℃, the time is 600s, the secondary vulcanization temperature is 150-170 ℃, the temperature is preferably 150 ℃, and the time is 1800s.
The "parts" described in the examples of the present invention are all in parts by weight.
Example 1
A method for preparing a nitrile rubber-based composite material for a cushion pad of a pneumatic nailing gun, comprising the steps of:
(1) Preparing butadiene and acrylonitrile into nitrile rubber in a ratio of 72:28 by adopting an emulsion polymerization method (polymerization is carried out by dispersing monomers in water or a nonaqueous medium under the action of mechanical stirring and an emulsifier to form stable emulsion); mechanically mixing and dispersing single-wall carbon nano tubes in a carrier of nitrile rubber and environment-friendly plasticizer alkyl sulfonate phenyl ester in a mass ratio of 24:71 to obtain carbon nano tube pre-dispersion;
(2) Putting 100 parts of nitrile rubber into an ML-35L internal mixer, banburying for 40s at 85 ℃ and 0.5MPa, adding 100 parts of carbon black (wherein, the carbon black is N55050 parts and the carbon black is N77450 parts), 5 parts of carbon nano tube pre-dispersion, 5 parts of reactive plasticizer B-3000, 6 parts of zinc oxide, 3 parts of antioxidant (wherein, RD 2 parts and MB 1 parts), 1 part of microcrystalline wax and 1 part of stearic acid, banburying for 200s, cleaning a banburying chamber, continuously banburying to 130 ℃ and discharging rubber to obtain the rubber compound without vulcanizing agent;
(3) The method comprises the steps of wrapping a roll of the rubber compound without the vulcanizing agent, adding 5 parts of the vulcanizing agent (wherein 0.5 part of sulfur, 1.5 parts of TMTD, 1.0 part of CBS and 2.0 parts of DCP) after forming smooth wrapped roll rubber, performing left and right cutting for 8 times, and performing triangular wrapping and thin pass (wherein the thin pass is 0.5-1mm in roll spacing and 3-4mm in roll spacing) after the vulcanizing agent is completely eaten into rubber, and discharging sheets after rolling for 3 times to obtain the rubber compound containing the vulcanizing agent;
(4) Firstly, preheating and rolling the mixed rubber containing the vulcanizing agent in an open mill, and controlling the rubber rolling temperature at 60 ℃. Then the coiled sizing material is put into a preforming machine of an 18-cavity die, and then is extruded and molded under the conditions of the pressure of 12MPa and the temperature of 75 ℃ to obtain a rubber blank;
(5) Vulcanizing the rubber blank on a 50-ton plate vulcanizing machine at 170 ℃ for 600s, and vulcanizing the rubber blank at 150 ℃ for 1800s to obtain the nitrile rubber base composite material for the cushion pad of the pneumatic nailing gun.
Comparative example 1
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: adding 5 parts of dioctyl sebacate without adding a carbon nano tube pre-dispersion and a reactive plasticizer B-3000, wherein the vulcanizing agent is 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
Comparative example 2
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: 2 parts of carbon nano tube pre-dispersion and 5 parts of dioctyl sebacate are added without adding a reactive plasticizer B-3000, and the vulcanizing agent is 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
Comparative example 3
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: adding 12 parts of carbon nano tube pre-dispersion and 5 parts of dioctyl sebacate without adding a reactive plasticizer B-3000, wherein the vulcanizing agent comprises 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
Comparative example 4
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: 3 parts of reactive plasticizer B-3000 are added without adding carbon nano tube pre-dispersion, and the vulcanizing agent is 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
Comparative example 5
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: 22 parts of reactive plasticizer B-3000 are added without adding the carbon nano tube pre-dispersion, and the vulcanizing agent is 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
Comparative example 6
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: 3 parts of carbon nano tube pre-dispersion and 5 parts of dioctyl sebacate are added without adding a reactive plasticizer B-3000, and the vulcanizing agent is 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
Comparative example 7
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: 5 parts of dioctyl sebacate is added without adding a reactive plasticizer B-3000, and the vulcanizing agent is 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
Comparative example 8
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: adding 10 parts of carbon nano tube pre-dispersion and 5 parts of dioctyl sebacate without adding a reactive plasticizer B-3000, wherein the vulcanizing agent comprises 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
Comparative example 9
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: no carbon nanotube pre-dispersion is added, and the vulcanizing agent is 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
Comparative example 10
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: 10 parts of reactive plasticizer B-3000 are added without adding the carbon nano tube pre-dispersion, and the vulcanizing agent is 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
Comparative example 11
A method of preparing a nitrile rubber-based composite for a pneumatic nailer cushion, differing from example 1 only in: 20 parts of reactive plasticizer B-3000 are added without adding carbon nano tube pre-dispersion, and the vulcanizing agent is 1 part of sulfur, 1.5 parts of TMTD, 2 parts of CBS and 0.5 part of MBTS;
the rest of the procedure is the same as in example 1.
The amounts of the raw materials used in example 1 and comparative examples 1 to 11 are shown in Table 1.
TABLE 1
The nitrile rubber-based composites prepared in example 1 and comparative examples 1-12 were tested for sulfur change characteristics (177 ℃ C. 6 Min), conventional physical properties, compression set (type B, 15% compression, 100 ℃ C. 72 r), impact life (7.2 ten thousand times target impact times, 20MPA impact pressure, about 1 impact per 1.5 seconds), and the test results are shown in tables 2-4.
TABLE 2 Sulfur transition Properties
TABLE 3 conventional Properties
TABLE 4 compression set and impact life
As can be seen from tables 2 to 4, in comparative examples 1 and 7, the carbon nanotube pre-dispersion was not added in comparative example 1, and 5 parts of the carbon nanotube pre-dispersion was added in comparative example 7, and from the life, the nitrile rubber-based composite material prepared in comparative example 7 was damaged after 4.8 ten-thousand impacts, and it was found that the life of the nitrile rubber-based composite material was remarkably improved by adding the carbon nanotube pre-dispersion, whereas the nitrile rubber-based composite material prepared in comparative example 1 was significantly damaged after 1.1 ten-thousand impacts. This proves that the stretching strength and the impact resistance of the material are obviously improved after the carbon nano tube pre-dispersion is added, so that the service life of the product is prolonged.
As can be seen from comparison of comparative examples 2, 3, 6, 7 and 8, although both comparative examples 2 and 3 have carbon nanotube pre-dispersion added, the addition amount in comparative example 2 is small, so that the improvement of material properties is limited and the life-prolonging effect is limited; the addition of comparative example 3 was too large, resulting in too high rigidity of the material prepared therefrom, thereby damaging the hand piece.
As is clear from comparative analysis of comparative examples 1 and 10, comparative example 1 was free from B-3000, and comparative example 10 was free from B-3000, and 5 parts of B-3000 was added, and from the viewpoint of life, the material prepared in comparative example 10 was broken after 5.2 ten thousand times of impact, and the life was improved, and comparative example 1 was free from B-3000, and from 1.1 ten thousand times of impact, a large damage phenomenon had occurred. This proves that after B-3000 is added, the stretching strength and impact resistance of the material are obviously improved, and the service life of the product is prolonged. Meanwhile, the number of B-3000 increases. ML goes down and MH goes up. The rubber has plasticizing effect in the initial stage of mixing and vulcanization, and participates in crosslinking after vulcanization, so that the stretching strength of the material is improved.
In the embodiment 1, 5 parts of carbon nano tube and 5 parts of B-3000 are added, and a peroxide vulcanizing agent DCP is adopted, so that the heat resistance of the material is improved, and the advantages of the carbon nano tube and the B-3000 are combined. Further, the service life of the material is improved (the service life of the material is the result of the comprehensive influence of factors such as the stretching strength, the modulus, the elongation, the heat resistance and the like of the material).
In conclusion, the carbon nano tube, the B-3000 and the vulcanizing agent are added into the formula of the nitrile rubber, so that the modulus, the tearing strength and the compression set of the rubber product are greatly improved, the high impact resistance of the rubber product is greatly improved compared with that of the comparative example 1, the use condition of the product is expanded, the product can adapt to more severe environments such as shock absorption, and the like, and further the high impact resistance buffer use requirement of a pneumatic nailing gun can be met.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (9)
1. A nitrile rubber-based composite material for a pneumatic nailing gun cushion, which is characterized by comprising the following raw materials in parts by weight: 100 parts of nitrile rubber, 60-120 parts of carbon black, 3-10 parts of carbon nano tube pre-dispersion, 5-20 parts of reactive plasticizer, 2-10 parts of zinc oxide, 3-6 parts of vulcanizing agent, 1-5 parts of anti-aging agent, 1-2 parts of stearic acid, 1 part of microcrystalline wax and 0-5 parts of dioctyl sebacate.
2. The nitrile rubber-based composite material for a pneumatic nailer cushion of claim 1, wherein said nitrile rubber has a mooney viscosity of > 70 at ML1+10, 100 ℃;
the nitrile rubber is prepared by emulsion polymerization of butadiene and acrylonitrile in the ratio of (75-60) to (25-40).
3. The nitrile rubber-based composite material for a pneumatic nailing gun bumper pad of claim 1, wherein the preparation method of the carbon nanotube pre-dispersion is as follows: dispersing the carbon nano tube in a carrier to obtain the carbon nano tube pre-dispersion;
wherein the carbon nanotubes are single-walled carbon nanotubes, the content of which is 5wt.% of the carbon nanotube pre-dispersion;
the diameter of the single-wall carbon nano tube is 1.2-2.0nm, and the length is 5 mu m;
the carrier is a mixed solvent of nitrile rubber and an environment-friendly plasticizer in a mass ratio of 24:71;
wherein the environment-friendly plasticizer is alkyl benzene sulfonate.
4. The nitrile rubber-based composite material for a pneumatic nailer cushion of claim 1, wherein said carbon black is either one of carbon black N550 and carbon black N774 or a combination of both in any ratio;
the reactive plasticizer is any one of B-2000 and B-3000 or the combination of the two in any proportion;
the vulcanizing agent is any one or mixture of more of DCP, sulfur, TMTD, CBS and MBTS in any proportion;
the antioxidant is any one or mixture of several of antioxidants MB, RD and MBZ in any proportion.
5. A method of preparing a nitrile rubber matrix composite for a pneumatic nailer cushion as claimed in any one of claims 1 to 4, comprising the steps of:
(1) Performing primary banburying on the nitrile rubber, and then adding the carbon black, the carbon nano tube pre-dispersion, the reactive plasticizer, the zinc oxide, the anti-aging agent, stearic acid, microcrystalline wax and dioctyl sebacate for secondary banburying to obtain a rubber compound without a vulcanizing agent;
(2) Adding the vulcanizing agent into the rubber compound without the vulcanizing agent, and carrying out open mixing to obtain the rubber compound containing the vulcanizing agent;
(3) Preforming the rubber compound containing the sulfonating agent by a preforming machine to obtain rubber blanks;
(4) And vulcanizing the rubber blank to obtain the nitrile rubber base composite material for the cushion pad of the pneumatic nailing gun.
6. The method for preparing a nitrile rubber matrix composite for a cushion pad of a pneumatic nailing gun of claim 5, wherein the time of the primary banburying in the step (1) is 20-120s, the pressure is 0.5-0.6MPa, and the temperature is 85 ℃;
the secondary banburying time is 60-240s, and the banburying temperature is 130-160 ℃.
7. The method of preparing a nitrile rubber matrix composite for a cushion pad of a pneumatic nailing gun of claim 5, wherein the open mill in step (2) is specifically performed by: firstly, adding the rubber compound without the vulcanizing agent into a roll wrapping machine, adding the vulcanizing agent after forming smooth roll wrapping rubber, and discharging sheets after triangular wrapping and thin rolling to obtain the rubber compound containing the vulcanizing agent;
wherein the times of triangle packing and thin pass are 5 times;
the thin pass is a thin pass with a roll gap of 0.5-1 mm;
the number of times of rolling is 3, and the roll gap is 3-4mm;
the thickness of the film is 3-4mm when the film is discharged.
8. The method of preparing a nitrile rubber matrix composite for a cushion pad of a pneumatic nailing gun of claim 5, wherein the preforming process of the preforming machine in step (3) is as follows: preheating and rolling the mixed rubber containing the vulcanizing agent at the temperature of 60-90 ℃, and extruding the mixed rubber into rubber blanks required by vulcanization at the temperature of 60-75 ℃ under the pressure of 8-15 MPa.
9. The method of preparing a nitrile rubber matrix composite for a pneumatic nailer cushion as recited in claim 5, wherein said vulcanizing in step (4) is: and (3) performing twice vulcanization on a 50-ton plate vulcanizing machine, wherein the primary vulcanization temperature is 150-170 ℃, the time is 500-1500s, and the secondary vulcanization temperature is 150-170 ℃ and the time is 1800s.
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| CN202310856172.8A CN116855003A (en) | 2023-07-13 | 2023-07-13 | Butyronitrile rubber-based composite material for pneumatic nailing gun buffer cushion and preparation method thereof |
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| CN202310856172.8A CN116855003A (en) | 2023-07-13 | 2023-07-13 | Butyronitrile rubber-based composite material for pneumatic nailing gun buffer cushion and preparation method thereof |
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