CN113583305A - Melting and chemical modification combine harvester crawler material and preparation method thereof - Google Patents

Abstract

The invention provides a melting and chemical modification combine harvester caterpillar material and a preparation method thereof, the material takes natural rubber NR-SCRWF, solution polymerized styrene-butadiene rubber SSBR-2557TH, plastic type chlorinated polyethylene and artificial eucommia rubber TPI as main raw materials, DCPC modified resin, tear-resistant resin and tackifying resin are added, and various functional additives are compounded to modify the material. The material disclosed by the invention has excellent tensile property, tear resistance, wear resistance and the like, is prepared into a combine harvester crawler, has ideal comprehensive performance and long service life, and is suitable for large-scale popularization and application.

Description

Melting and chemical modification combine harvester crawler material and preparation method thereof

Technical Field

The invention relates to a rubber-plastic modified material for an agricultural combine harvester, in particular to a melting and chemical modified combine harvester crawler material and a preparation method thereof.

Background

The caterpillar is a basic unit forming the rice/wheat combine harvester, the traditional caterpillar is made of metal, is unstable, easy to break and difficult to maintain when walking, has large running vibration on a hardened cement road, is easy to wear and deform a frame, and is easy to damage a road surface. In order to reduce the damage of a metal crawler belt to a road surface, reduce the ground compression ratio of the land, improve the riding comfort, improve the physical performance and chemical protection function of the crawler belt, reduce vibration and noise, improve the wear resistance and improve the tearing strength of the crawler belt steering, the rubber crawler belt is more and more popular, however, the prior rubber material is used as the crawler belt of the combine harvester, and the performances in all aspects are not ideal, so that the development of a composite modified rubber crawler belt material is urgently needed.

Disclosure of Invention

The invention aims to provide a melting and chemical modification combine harvester crawler material and a preparation method thereof, and aims to solve the problems that the existing metal crawler has more defects and the existing rubber material has poor performance.

The technical scheme adopted by the invention for realizing the purpose is as follows: a melting and chemical modification combine harvester caterpillar material comprises the following components in parts by weight:

natural rubber NR-SCRWF: 85-95 parts of solution polymerized styrene butadiene rubber SSBR-2557 TH: 18-22 parts of plastic type chlorinated polyethylene: 8-12 parts of artificial eucommia rubber TPI: 4-6 parts of dispersant PL-90: 0.1-0.3 part of brightener TM-80: 0.2-0.4 part of DCPC resin: 1-3 parts of tear-resistant resin: 2-4 parts of tackifying resin: 1-3 parts of anti-reversion agent SR-534: 1-2.5 parts of anti-reversion agent CSP-808: 0.1-0.6 parts of zinc oxide: 4-6 parts of stearic acid S.A: 1-3 parts of an anti-aging agent ODA: 1-2 parts of an anti-aging agent NAPM: 1-2 parts, polyethylene glycol PEG-4000: 2-4 parts of white carbon black: 9-11 parts of a silane coupling agent Si-69: 1-3 parts of talcum powder: 7-9 parts of carbon black: 48-52 parts of cold-resistant plasticizer DOS: 8-10 parts of a processing aid WB-212: 1-3 parts of accelerator NS: 0.5-0.7 parts of accelerator CZ: 0.3-0.5 parts of vulcanizing agent PAS-80: 1-2 parts of modifier IDH: 0.4-0.6 part of modifier HVA-2: 0.5 to 1.5 portions.

The plastic type chlorinated polyethylene is CPE-150, the tear-resistant resin is tear-resistant resin SL-509, and the tackifying resin is tackifying resin SL-1801.

The white carbon black is high-dispersion white carbon black, the talcum powder is superfine talcum powder, and the carbon black is carbon black N234.

The material used in the formula of the invention has the following characteristics:

(1) the main material is made of (NR) natural rubber, (SSBR) solution polymerized styrene-butadiene rubber, (CPE) plastic chlorinated polyethylene and (TPI) artificial eucommia rubber (as a damping agent), so that the damping performance of the material is greatly improved, and the bonding performance of a steel wire rope net structure framework arranged in the material domain is enhanced.

(2) The plasticizer uses cold-resistant operating oil DOS (dioctyl sebacate) to greatly improve the cold resistance.

(3) The chemical degradation dispersant PL-90 and the frost inhibitor TM-80 are used together to break up and repolymerize the native collagen material, so that the density of the new polymer is increased, and the solvent resistance is greatly improved.

(4) The bonding type antiager ODA and NAPM are used in large dosage, so that the synergistic effect of the cold-resistant plasticizer DOS (dioctyl sebacate) epoxidized soybean oil (stabilizer) and the crosslinking modifier are crosslinked into a net shape and are firmly interwoven together, so that no room for extraction exists.

(5) The modified resin DCPD is used, and the DCPC resin is brand-new diene cross-linked thermosetting resin, has higher softening point, good tackifying effect, strong stability and impact resistance. Rigidity, excellent acid and alkali resistance and excellent low temperature resistance, and has certain effect on the tearing strength, the wearing property and the tensile property of rubber. The DCPC resin contains a certain double bond, generates a crosslinking reaction in the vulcanization process, and has an influence effect on the physical and chemical properties of the sizing material together with the reinforcement of a complementary system.

(6) The tearing-resistant resin SL-509 and the tackifying resin SL-1801 are used to generate synergistic effect, so that the tearing strength of the new polymer reacted by the sizing material is doubled.

(7) The synergistic effect of the anti-reversion agent SR534 used in combination with CSP8008 in large doses results in a continuous and longer service life of the new polymeric track.

(8) The high-dispersion white carbon black is used and subjected to silane coupling treatment, so that the high-dispersion white carbon black is firmly combined with raw rubber, the heat generation is reduced, and the polymerization degree of a new polymer is improved by conduction heat generation.

(9) Various operation aids such as TM-80, PL-90, WB-212, PEG-4000 and the like are used, and the whole mixing process is run through in special mechanical equipment. To ensure that the specific performance is formed within the set range.

(10) The novel functional auxiliary agent IDH is used and can perform chemical reaction with terminal aldehyde groups of NR molecules, so that the loss factor tan delta can be obviously reduced, the dynamic heat generation of rubber can be obviously reduced, the energy loss is reduced, the service life is prolonged, and the resilience of the rubber material is improved.

(11) A novel vulcanizing agent PAS-80 is used, and the PAS-80 is a nontoxic and odorless sulfur donor with an organic polymer addition structure and has the characteristics of no sulfur spraying and no frost vulcanization. Good compatibility with rubber and can improve the adhesive property of the rubber and the framework material (steel wire or fiber) under the condition of heat or high temperature.

(12) Under the control of special machinery, the multifunctional chemical modifier HVA-2 makes the synergistic effect and reaction effect of several special functional assistants to modify original polymer into new polymer which has no original polymer function-infinitely prolonged caterpillar band service life.

The preparation method of the material comprises the following steps:

(a) preparing:

(1) heating the heating type high-low double-speed stirrer to 62-68 ℃ for later use;

(2) heating the heated open mill to 78-82 ℃ for later use;

(3) heating, pressurizing, rotating positively and negatively, and raising the temperature of a speed-regulating internal mixer by 108-;

(4) accurately weighing the raw materials according to the formula for later use;

(b) coupling treatment of white carbon black and talcum powder:

adding white carbon black and talcum powder into a stirrer for standby heating, starting at a low speed, dropwise adding a silane coupling agent si-69 at a feeding port, immediately stirring at a high speed after dropwise adding, stopping when the temperature reaches 105-;

(c) adding artificial eucommia rubber TPI, plastic type chlorinated polyethylene for plastication and PL-90 into an open mill for standby after heating, plasticating uniformly, and taking out tablets for standby when the materials are plasticated to be nearly transparent;

(d) adding the solution polymerized styrene-butadiene rubber SSBR-2557TH, the natural rubber NR-SCRWF and the TM-80 into an open mill for plasticating and plasticating, uniformly plasticating, and taking out a sheet for later use when the solution polymerized styrene-butadiene rubber is plasticated to be transparent;

(e) modification and banburying by an internal mixer:

adding the masterbatch obtained in the step (c), the masterbatch obtained in the step (d), the white carbon black treated in the step (b) and the talcum powder into an internal mixer which is heated for standby, dropping a top bolt, and carrying out internal mixing for 0.5-1.5 min; lifting the upper top plug, adding DCPC modified resin, tear-resistant resin and tackifying resin, then dropping the upper top plug, and plastifying for 1.5-2.5 min; carrying out secondary thrombus extraction, adding an anti-vulcanization reversion agent SR-534 and an anti-vulcanization reversion agent csp-8008, and carrying out thrombus dropping and mixing for 0.5-3 min; extracting the suppository again, adding the anti-aging agents ODA, NAPM, stearic acid and PEG-4000, dropping the upper suppository, and mixing for 1-2 min; carrying out bolt lifting for the fourth time, adding carbon black, adding a processing aid WB-212, carrying out bolt dropping and mixing, carrying out pressurized mixing for 2-4min, carrying out bolt lifting, adding a cold-resistant plasticizer DOS, carrying out bolt dropping and mixing for 1.5-2.5min, stopping, backing up, carrying out mixing for 1.5-2.5min, converting into forward rotation and mixing, discharging when the temperature reaches 155 ℃, carrying out forced cooling to the room temperature after discharging, and standing for 3-5h for later use;

(f) adding a vulcanizing agent and a modifier into an open mill:

adding the master batch subjected to banburying in the step (e) into a cooling type open mill, adding zinc oxide after roller wrapping, uniformly rolling once, adding the promoters NS and CZ, rolling once, and rolling triangular bag once; and adding a vulcanizing agent PAS-80, mixing, uniformly mixing, beating two corners and two rolls, adding a modifier IDH and a modifier HVA-2, mixing, thinly passing, beating for six times in a triangular bag, beating and rolling for four times, uniformly discharging, airing, and standing for 22-26h to obtain the material.

Firstly, the material of the invention has the following technical effects:

(1) has extremely strong anti-reversion performance;

(2) the stress at 100% and the stress at 300% both of them do not decrease and rise reversely, showing vigorous vitality;

(3) has extremely high tensile property;

(4) the hardness is not reduced and reversely increased, the extremely high crosslinking density is shown, and the solvent resistance is greatly improved;

(5) the tear resistance is improved by a high factor;

(6) the wear resistance is obviously improved;

(7) the resilience is better improved;

(8) the damping performance of the crawler belt is improved greatly;

(9) greatly prolongs the service life of the material, and prolongs the service life of the composite modified crawler belt.

Secondly, the preparation method of the invention has the following technical effects:

(1) the manufacturing performance requirements, the main properties and the performance range of these properties are determined.

(2) The technological properties and the ratio of the properties of the rubber compound required by adapting to production equipment and preparation technology are determined.

(3) Selecting main materials with the performance reaching the appointed performance of the rubber material and vulcanized rubber, and determining the dosage proportion of the main materials.

(4) In order to meet the requirements of high tearing performance and high wear resistance of the combined harvester caterpillar and the caterpillar made of the compound modified natural rubber and the ultra-long service life of the caterpillar, the caterpillar is made of an auxiliary material with special purposes except for a conventional material, and special technological measures are adopted.

(5) The special equipment is selected to ensure the formation of the special properties of the material.

(6) Has specific process temperature and feeding sequence and is easy to implement.

In conclusion, the track of the rice/wheat dual-purpose combine harvester with the ultra-long service life, which is prepared from the melting and chemical composite modified NR/SSBR/CPE/TPI composite material, belongs to the initiative, has ideal performance in all aspects, and is suitable for large-scale popularization and application.

Detailed Description

The invention is further illustrated by the following examples, which are given by way of illustration only and are not intended to limit the scope of the invention in any way.

In the embodiment of the invention:

NR (natural rubber) brand SCRWF, hainan natural rubber industry group gmbh; SSBR (solution polymerized styrene butadiene rubber) brand 2557TH, oil charge 37.5 parts, medium petrochemical research institute products; CPE (chlorinated polyethylene plastic) CPE-150, a product of Hebei Fine chemical group company; multifunctional DCPD resins, degussa chemical ltd; anti-reversion agent, No. SR534, sandomad, usa; CSP8008, guangzhou kuncao materials science and technology ltd; TPI, new materials ltd, Qingdao; HVA-2 (multifunctional modifier), Shanxi Jincheng Fine chemical Co., Ltd.; vulcanizing agent (novel) PAS-80, Shanghai Jinghai chemical Co., Ltd; the others are all products which are generally sold in the rubber raw material market.

Example 1

The formula of the melting and chemical modification combine harvester caterpillar material is shown in table 1:

TABLE 1 (by weight)

Material	Portions are	Material	Portions are	Material	Portions are
						NR-SCRWF	90	ZnO/S.A	5/2	CZ	0.4
SSBR-2557TH	20	(anti-) ODA/NAPM	1.5/1.5	PAS-80	1.5
						CPE-150	10	PEG-4000	3	IDH	0.5
TPI	5	High-dispersion white carbon black	10	HVA-2	1.0
						TM-80/PL-90	0.3/0.2	Si-69 (coupling agent)	2	Total up to	232.5
DCPC resin	2	Superfine talcum powder	8	Comprises	47.1％
						Tear resistant resins	3	Carbon Black N234	50
Tackifying resin SL-1801	2	Plasticizer DOS	9
						Anti-reversion agent SL-534	1.5	WB-212	2
Anti-reversion agent CSP-8008	0.5	NS	0.6

The preparation method of the material comprises the following steps:

<1> preparation:

(1) heating the heating type high-low double-speed stirrer to 65 ℃ for later use;

(2) heating the heated open mill to 80 ℃ for later use;

(3) heating an internal mixer by heating, pressurizing, rotating positively and negatively and regulating the speed to 110 ℃ for later use;

(4) the raw materials are weighed according to the formula standard for standby.

<2> white carbon black and talcum powder coupling treatment:

adding white carbon black and talcum powder into a stirrer for standby after heating, starting the stirrer at a low speed, dropwise adding a silane coupling agent si-69 into a feeding port, immediately stirring the stirrer at a high speed after the dropwise adding is finished, stopping the stirrer when a temperature table shows that the temperature is 108 ℃, discharging the materials by starting the stirrer at the low speed, and stacking the materials for standby after 2 hours after the materials are discharged.

And 3, adding TPI and CPE-150 into an open mill for plastication, uniformly plasticating, and naturally loosening the discharged sheets for later use when the sheets are transparent but not transparent.

And 4, adding SSBR-2557TH into the open mill, adding NR-SCRWF for plastication and plastication, uniformly plasticating, and taking out the sheet for later use when the sheet is plasticated to be transparent.

<5> modification and banburying of an internal mixer:

adding the masterbatch obtained in the step (c), the masterbatch obtained in the step (d), the white carbon black treated in the step (b) and the talcum powder into an internal mixer which is heated for standby, dropping down a top bolt, and internally mixing for 1 min; lifting the upper top plug, adding DCPC modified resin, anti-tear resin and tackifying resin, then dropping the upper top plug, and plastifying for 2 min; carrying out secondary thrombus extraction, adding an anti-vulcanization reversion agent SR-534 and an anti-vulcanization reversion agent csp-8008, and carrying out thrombus falling and mixing for 2 min; extracting the suppository again, adding the anti-aging agents ODA, NAPM, stearic acid and PEG-4000, dropping the upper suppository, and mixing for 1.5 min; carrying out bolt lifting for the fourth time, adding carbon black, adding a processing aid WB-212, carrying out bolt dropping and mixing, carrying out pressurized mixing for 3min, carrying out bolt lifting, adding a cold-resistant plasticizer DOS, carrying out bolt dropping and mixing for 2min, stopping, backing, carrying out mixing for 2min, converting into forward rotation and mixing, discharging when the temperature reaches 155 ℃, and carrying out forced cooling to room temperature after discharging, standing for 4h for later use;

<6> adding vulcanizing agent and modifier into the open mill:

adding the master batch subjected to banburying in the step (e) into a cooling type open mill, adding zinc oxide after roller wrapping, uniformly rolling once, adding the promoters NS and CZ, rolling once, and rolling triangular bag once; and adding a vulcanizing agent PAS-80, mixing, uniformly mixing, beating two corners and two rolls, adding a modifier IDH and a modifier HVA-2, mixing, thinly passing, beating for six times in a triangular bag, beating for four times, uniformly slicing, airing, and standing for 24 hours to obtain the material.

Example 2 Performance testing

The test specimens of example 1 were tested according to the relevant national standards. The test results are shown in tables 2 and 3.

Table 2: physical properties of the Material (150 ℃ C.. times.10 mpa.t)₉₀)

As can be seen from the above table: all the performances of the high-quality formula are excellent, and the use requirement of the crawler belt of the rice/barley dual-purpose combine harvester is completely met.

And then, the modified material is subjected to an over-vulcanization test (namely a destructive test), and the service life of the caterpillar prepared from the composite modified material is determined by the service life of the rubber material.

Positive vulcanization point 150 ℃ x t₉₀(28min) comparison of the results of the over-vulcanization test at 150 ℃ for 120min is shown in Table 3:

table 3:

the above table shows by comparing the test results: the over-vulcanization test (destructive test) is ideal and even superior to the positive vulcanization test result, which shows that the novel polymer modified by melting and special mechanical and chemical composite is very successful and produces unexpected technical effects. From the above 150 ℃ x 120min overcuring test, it can also be seen that the composite modified NR/SSBR/CPE/TPI composite modified material has the following properties:

(1) the reversion resistance is very good, which is shown in that the 100 percent stress at definite elongation and the 300 percent stress at definite elongation are not reduced but increased. Indicating that the chain of the new polymer is crosslinked-cracked-re-crosslinked-re-cracked-re-crosslinked. The representation is that the vitality is prolonged, which shows that the service life of the caterpillar track of the new polymer after composite modification is prolonged and then is prolonged.

(2) The Shore A hardness is not reduced but increased, which shows that the solvent resistance is greatly improved.

(3) The tear properties are clearly improved, showing a doubling of the tear properties.

(4) The wear resistance is obviously improved.

(5) The resilience performance is obviously improved.

(6) The shock absorption performance is obviously improved.

(7) The adhesive property is obviously improved.

(8) Has extremely high tensile property, and the tensile strength indicates that the steel is firm and not damaged but only slightly reduced. The elongation shows a small reduction, and the elongation fully shows that the service life of the composite modified rubber/plastic rice/wheat dual-purpose combine harvester crawler is prolonged, and the composite modified rubber/plastic rice/wheat dual-purpose combine harvester crawler has an ultra-long service life.

Claims (4)

1. A melting and chemical modification combine harvester caterpillar material is characterized by comprising the following components in parts by weight:

natural rubber NR-SCRWF: 85-95 parts of solution polymerized styrene butadiene rubber SSBR-2557 TH: 18-22 parts of plastic type chlorinated polyethylene: 8-12 parts of artificial eucommia rubber TPI: 4-6 parts of dispersant PL-90: 0.1-0.3 part of brightener TM-80: 0.2-0.4 part of DCPC resin: 1-3 parts of tear-resistant resin: 2-4 parts of tackifying resin: 1-3 parts of anti-reversion agent SR-534: 1-2.5 parts of anti-reversion agent CSP-808: 0.1-0.6 parts of zinc oxide: 4-6 parts of stearic acid S.A: 1-3 parts of an anti-aging agent ODA: 1-2 parts of an anti-aging agent NAPM: 1-2 parts, polyethylene glycol PEG-4000: 2-4 parts of white carbon black: 9-11 parts of a silane coupling agent Si-69: 1-3 parts of talcum powder: 7-9 parts of carbon black: 48-52 parts of cold-resistant plasticizer DOS: 8-10 parts of a processing aid WB-212: 1-3 parts of accelerator NS: 0.5-0.7 parts of accelerator CZ: 0.3-0.5 parts of vulcanizing agent PAS-80: 1-2 parts of modifier IDH: 0.4-0.6 part of modifier HVA-2: 0.5 to 1.5 portions.

2. The melting and chemical modification combine harvester track material as claimed in claim 1, wherein the plastic type chlorinated polyethylene is CPE-150, the tear resistant resin is tear resistant resin SL-509, and the tackifying resin is tackifying resin SL-1801.

3. The melting and chemically modifying combine harvester track material as defined in claim 1, wherein the white carbon black is highly dispersed white carbon black, the talc is ultra-fine talc, and the carbon black is carbon black N234.

4. A method for preparing a material according to any one of claims 1 to 3, comprising the steps of:

(a) preparing:

(1) heating the heating type high-low double-speed stirrer to 62-68 ℃ for later use;

(2) heating the heated open mill to 78-82 ℃ for later use;

(3) heating, pressurizing, rotating positively and negatively, and raising the temperature of a speed-regulating internal mixer by 108-;

(4) accurately weighing the raw materials according to the formula for later use;

(b) coupling treatment of white carbon black and talcum powder:

adding white carbon black and talcum powder into a stirrer for standby heating, starting at a low speed, dropwise adding a silane coupling agent si-69 at a feeding port, immediately stirring at a high speed after dropwise adding, stopping when the temperature reaches 105-;

(c) adding artificial eucommia rubber TPI and plastic type chlorinated polyethylene into an open mill for plastication, uniformly plasticating PL-90, and taking out tablets for later use when the plastication is nearly transparent;

(d) adding the solution polymerized styrene-butadiene rubber SSBR-2557TH, the natural rubber NR-SCRWF and the TM-80 into an open mill for plasticating and plasticating, uniformly plasticating, and taking out a sheet for later use when the solution polymerized styrene-butadiene rubber is plasticated to be transparent;

(e) modification and banburying by an internal mixer:

adding the masterbatch obtained in the step (c), the masterbatch obtained in the step (d), the white carbon black treated in the step (b) and the talcum powder into an internal mixer which is heated for standby, dropping a top bolt, and carrying out internal mixing for 0.5-1.5 min; lifting the upper top plug, adding DCPC modified resin, tear-resistant resin and tackifying resin, then dropping the upper top plug, and plastifying for 1.5-2.5 min; carrying out secondary thrombus extraction, adding an anti-vulcanization reversion agent SR-534 and an anti-vulcanization reversion agent csp-8008, and carrying out thrombus dropping and mixing for 0.5-3 min; extracting the suppository again, adding the anti-aging agents ODA, NAPM, stearic acid and PEG-4000, dropping the upper suppository, and mixing for 1-2 min; carrying out bolt lifting for the fourth time, adding carbon black, adding a processing aid WB-212, carrying out bolt dropping and mixing, carrying out pressurized mixing for 2-4min, carrying out bolt lifting, adding a cold-resistant plasticizer DOS, carrying out bolt dropping and mixing for 1.5-2.5min, stopping, backing up, carrying out mixing for 1.5-2.5min, converting into forward rotation and mixing, discharging when the temperature reaches 155 ℃, carrying out forced cooling to the room temperature after discharging, and standing for 3-5h for later use;

(f) adding a vulcanizing agent and a modifier into an open mill:

adding the master batch subjected to banburying in the step (e) into a cooling type open mill, adding zinc oxide after roller wrapping, uniformly rolling once, adding the promoters NS and CZ, rolling once, and rolling triangular bag once; and adding a vulcanizing agent PAS-80, mixing, uniformly mixing, beating two corners and two rolls, adding a modifier IDH and a modifier HVA-2, mixing, thinly passing, beating for six times in a triangular bag, beating and rolling for four times, uniformly discharging, airing, and standing for 22-26h to obtain the material.