CN1081634A - The manufacture method of polyurethane rice huller rubber roller - Google Patents
The manufacture method of polyurethane rice huller rubber roller Download PDFInfo
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- CN1081634A CN1081634A CN 92109803 CN92109803A CN1081634A CN 1081634 A CN1081634 A CN 1081634A CN 92109803 CN92109803 CN 92109803 CN 92109803 A CN92109803 A CN 92109803A CN 1081634 A CN1081634 A CN 1081634A
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- rubber roll
- polyurethane
- performed polymer
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- vulcabond
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Abstract
A kind of manufacture method of polyurethane rice huller rubber roller, be make with polyester and di-isocyanate reaction contain-performed polymer of NCO group, the chain extender MOCA that adds by-NCO cubage amount then participate in reaction, reactant is made paddy hulling rubber roll through cast, sulfuration, maturing process.This rubber roll surfacing, good springiness, rice huller stable mechanical performance during paddy, temperature rise is low, and the shelling rate reaches more than 90.5%, and converted products meets national standard, and rubber roll is 4.5～5 times of common rubber roll service life, and the polyurethane rubber roller of producing than prior art is also durable.
Description
The invention belongs to the manufacturing technology of polyurethane articles for use.
The hub (shelling) of hulling in the paddy processing uses rubber roll that the history in several ten years is only arranged, and the used sizing material of rubber roll mainly is to use natural rubber, butadiene-styrene rubber etc.Yet this hardness of rubber roll height, poor flexibility, anti-wear performance also can not be satisfactory, if the black rubber roll, rice is black during rice huller paddy.If it is main the making that rubber roll adopts NBR, then wearability, temperature tolerance make moderate progress.Its breaking strength of one-level black rubber roll of China ministry standard regulation be＞120kg/cm, elongation at break＞200%, and the decrement of wearing and tearing is＜1.2cm
3/ 1.614m.Polyurethane elastomer with moulding by casting is the special high polymer goods of a kind of performance, has wear-resisting, tension, resistance to compression, oil resistant, anti-solvent and have advantages such as high resiliency under high rigidity.The hulling rubber roller made from polyurethane improves more than 2.5 times breaking strength＞300kg/cm service life than general rubber roll
2, elongation at break＞450%, wearing and tearing decrement＜0.06cm
3/ 1.64m, shore hardness are 80～90, and the stable performance of using time tool, temperature rise are low, output can reach 3810.4kg/h, and the glue consumption is 130.73kg/g, promptly process only 1g of 130.73kg brown rice consumption glue, husking yield is 88.5%, and this is a sizable progress to the paddy processing industry.The technology of making this polyurethane paddy hulling rubber roll is: make polyurethane prepolymer earlier, mix the back again with chain extender and inject mould, after mold pressing, sulfidization molding, demoulding slaking and product.
The objective of the invention is provides more reasonable, practical manufacture method on the basis of existing polyurethane paddy hulling rubber roll production technology, make its product have higher intensity, suitable hardness, elasticity and more wear-resisting.
Polyurethane elastomer is the synthesized polymer material of the non-constant width of class performance indications, can go to design raw material variety prescription and manufacturing process as required.The present invention needs very strong wearability when considering rice huller paddy, designs technological process as shown in drawings.Polyester (also claiming PEPA) is to be made by dihydroxylic alcohols and binary acid condensation, be the big molecule that has a considerable amount of hydroxyls and carboxyl, the molecular weight of the polyester that the present invention needs is 15000～18500, and hydroxyl value is 40～100mgKOH/g, acid number is 0.5～3.0mgKOH/g, moisture content＜0.2%.Also need during use to dewater under≤7.0kpa the vacuum at 120～140 ℃.The general formula of vulcabond is:
Commonly used is the TDI(toluene di-isocyanate(TDI), and isocyanate group has 2.4 and 2.6 differences), the present invention adopts pure 2.4 bodies to 24/26=80/20; Remove the MDI(diphenyl methane-4,4 that the present invention sometimes in addition also uses part '-vulcabond).Polyester is to add vulcabond when being cooled to 40～60 ℃ after dehydration, and reaction makes it carry out 1～2h under 80～88 ℃, and reaction is finished needs sample analysis wherein to contain-amount of NCO.The present invention designs this performed polymer and need contain-and NCO is 3～10%, so that further generating macromolecular elastomer with the chain extender reaction.At the reaction sample analysis-NCO content that finishes, need performed polymer is placed 110～120 ℃, 20～60min outgases under≤7.0kpa the vacuum, the degassing performed polymer that will measure then with according to the chain extender of performed polymer analysis-NCO cubage amount 80～90 ℃ of following mixing and stirring, inject the mould iron core, mixed material is because of chain propagation reaction retrogradation gel gradually, curing cage is sent in the closed die pressurization, 120～130 ℃ of sulfuration 1～3h, shed mould, the rubber roll that vulcanizates is placed slaking 8～12h under 70～90 ℃ of conditions, shear the finished product rubber roll.Chain extender also claims curing agent, is the following aromatic diamine of general formula:
X is a halogen, and n is 1～3, commonly used is 3,3 '-two chloro-4,4 '-diaminodiphenyl-methane (MOCA).
In making polyurethane rubber roller, raw materials used proportioning is (with polyester is 100, weight portion):
Polyester 100
Two cyanates 8～18
MOCA????10～20
Vulcabond is TDI, MDI, can use separately, also can mix usefulness; TDI accounts for 40～70% of vulcabond total amount when mixing use.In fact this prescription is according to the polyester data Quality, draws kind, specification, the quantity that vulcabond should use as required as calculated; According to the design performed polymer contain-NCO what and performed polymer make finish sample analysis its-NCO content calculates the consumption of MOCA.It is that the method according to radical reaction is carried out in the common high molecular weight reactive that consumption calculates.Rubber roll surfacing with method manufacturing of the present invention, good springiness, stable mechanical performance during rice huller paddy, temperature rise is low, the glue consumption is low, rice huller paddy output meets and exceeds rice huller paddy design flow, husking yield 〉=90%, be 4.5～5.0 times of common rubber roll service life, and the index of the finished product of rice huller paddy processing, semi-finished product, byproduct all meets national standard.
Characteristics of the present invention are: (1) manufacturing process is reasonable, require the quality index strictness of raw material, the raw material proportioning is suitable, (2) the paddy hulling rubber roll quality with this technology manufacturing not only is higher than traditional rubber roll out and away, and the polyurethane rubber roller quality of producing than prior art is good, the efficient height for improving rice huller paddy output, reduces power consumption, cost, alleviates labor strength and will play an important role.
Example 1
Hydroxyl value is 60mgKOH/g, and acid number is 1mgKOH/g, and molecular weight is that 17000 polyester 20kg places 50 liters of reactors, and 120～140 ℃,＜7.0kpa is dehydration 1.5h down, and the sample analysis water content is 0.1%.React with it with pure 2.4TDI, design prepolymer to contain-NCO is 5%, then
Q
TDI＝Q
OH+
H+Q
H2O+Q
NCO
＝1.89+0.194+2.55
＝4.634kg
When being cooled to 50 ℃ after the polyester dehydration 4.64kgTDI is added, make it react 1.5h down at 80～88 ℃, sample analysis-NCO content is 4.9%.Be warming up to 110～120 ℃ then, (660～5300pa) static degassing 40min under vacuum.Be cooled to 80 ℃, will contain according to performed polymer-NCO amount calculates MOCA3.8kg and adds and wherein mix.Inject the mould that the rubber roll core is housed while hot, treat that it is that the closed die pressurization is sent in the curing cage that the sizing material retrogradation becomes gel, vulcanizes 2h. down in 120～130 ℃.Take out the cooling back demoulding slightly, thick roller places 80 ℃ of following slaking 12h.Cut off tailing and be the finished product rubber roll.The JT25 type hulling machine practical application of packing into of this type of rubber roll, husking yield are more than 90.5%, and the glue consumption is promptly processed 934.5kg rice consumption glue 1g for 934.5kg/g(), effective time can reach 800h, and processing semi-finished product rice does not dye, and is phozy, smooth surface, it is few to crack rice, and meets national standard.
Embodiment 2
The polyester 20kg of quality index such as example 1, dehydration back water content is 0.1%, design performed polymer-NCO content 5%.Adopt TDI to participate in reaction with MDI mixing vulcabond, TDI is 2.89kg(16.6mol as calculated), MDI is 2.50kg(10.0mol).Performed polymer makes it-and NCO content is 4.8%, and weight is 24.5kg, needs the MOCA3.7kg reaction.Below operation and example 1 are together.
Claims (4)
1, a kind of performed polymer made from polyester, isocyanates again with chain extender reaction, is made the method for polyurethane paddy hulling rubber roll through cast, sulfuration, maturing process, it is characterized by raw materials used proportioning is (with polyester is 100, weight portion):
Polyester (MW15000～18500)
Hydroxyl value 40～100mgKOH/g
Acid number 0.5～3.0mgKOH/g
Moisture content＜0.2%) 100
Vulcabond (TDI or/and MDI, purity＞99%) 8～18
MOCA (purity＞95%) 10～20
2, the method for claim 1 is characterized by and uses vulcabond to be TDI and MDI, can use separately, also can mix use; TDI accounts for 40～70% of vulcabond total amount when mixing use.
3, the method for claim 1 is characterized by when making performed polymer, by performed polymer contain-the NCO amount is 3～10% to calculate and add vulcabond amount and pet reaction, mensurations-NCO content is again finished in reaction, next step reacts the consumption of MOCA by this cubage.
4, the method for claim 1 is characterized by the performed polymer manufacturing and ends and to need a degassing program, degassing condition be vacuum (≤under 110～120 ℃, carry out 20～40min under 7.0kpa).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92109803 CN1081634A (en) | 1992-07-30 | 1992-07-30 | The manufacture method of polyurethane rice huller rubber roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92109803 CN1081634A (en) | 1992-07-30 | 1992-07-30 | The manufacture method of polyurethane rice huller rubber roller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1081634A true CN1081634A (en) | 1994-02-09 |
Family
ID=4944358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92109803 Pending CN1081634A (en) | 1992-07-30 | 1992-07-30 | The manufacture method of polyurethane rice huller rubber roller |
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| CN (1) | CN1081634A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101130597B (en) * | 2007-09-29 | 2011-06-01 | 山东东大一诺威聚氨酯有限公司 | Synthesis method of solvent resistant solvent type urethane elastomer |
| CN102807665A (en) * | 2012-08-27 | 2012-12-05 | 马鞍山市天鑫辊业有限责任公司 | Low-hardness pouring polyurethane rubber roller and production method thereof |
| CN106589308A (en) * | 2016-12-23 | 2017-04-26 | 湖北天明粮油设备有限公司 | Method for preparing silicon carbide modified polyurethane material |
| CN106750133A (en) * | 2016-12-30 | 2017-05-31 | 山东诺威聚氨酯股份有限公司 | Low hardness polyurethane rubber roll material and preparation method thereof |
| CN108501282A (en) * | 2018-01-31 | 2018-09-07 | 江苏子田机械有限公司 | A kind of production technology of the automatic rubber roller for rice huller of air pressure |
| CN109206586A (en) * | 2018-10-22 | 2019-01-15 | 苏州市宝苏矿冶设备有限公司 | A kind of preparation method of polyurethane flame-proof cutting roller |
-
1992
- 1992-07-30 CN CN 92109803 patent/CN1081634A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101130597B (en) * | 2007-09-29 | 2011-06-01 | 山东东大一诺威聚氨酯有限公司 | Synthesis method of solvent resistant solvent type urethane elastomer |
| CN102807665A (en) * | 2012-08-27 | 2012-12-05 | 马鞍山市天鑫辊业有限责任公司 | Low-hardness pouring polyurethane rubber roller and production method thereof |
| CN106589308A (en) * | 2016-12-23 | 2017-04-26 | 湖北天明粮油设备有限公司 | Method for preparing silicon carbide modified polyurethane material |
| CN106750133A (en) * | 2016-12-30 | 2017-05-31 | 山东诺威聚氨酯股份有限公司 | Low hardness polyurethane rubber roll material and preparation method thereof |
| CN108501282A (en) * | 2018-01-31 | 2018-09-07 | 江苏子田机械有限公司 | A kind of production technology of the automatic rubber roller for rice huller of air pressure |
| CN109206586A (en) * | 2018-10-22 | 2019-01-15 | 苏州市宝苏矿冶设备有限公司 | A kind of preparation method of polyurethane flame-proof cutting roller |
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