CN110408000A - Low hardness polyurethane elastic body and preparation method thereof - Google Patents
Low hardness polyurethane elastic body and preparation method thereof Download PDFInfo
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- CN110408000A CN110408000A CN201910824580.9A CN201910824580A CN110408000A CN 110408000 A CN110408000 A CN 110408000A CN 201910824580 A CN201910824580 A CN 201910824580A CN 110408000 A CN110408000 A CN 110408000A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4236—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups
- C08G18/4238—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4244—Polycondensates having carboxylic or carbonic ester groups in the main chain containing oxygen in the form of ether groups
- C08G18/4247—Polycondensates having carboxylic or carbonic ester groups in the main chain containing oxygen in the form of ether groups derived from polyols containing at least one ether group and polycarboxylic acids
- C08G18/425—Polycondensates having carboxylic or carbonic ester groups in the main chain containing oxygen in the form of ether groups derived from polyols containing at least one ether group and polycarboxylic acids the polyols containing one or two ether groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
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- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- 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
- C08K3/34—Silicon-containing compounds
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- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/101—Esters; Ether-esters of monocarboxylic acids
- C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
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- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/11—Esters; Ether-esters of acyclic polycarboxylic acids
-
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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)
- Polyurethanes Or Polyureas (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Present invention relates particularly to a kind of low hardness polyurethane elastic body and preparation method thereof, elastomer is it is characterized in that raw material composition is as follows: 66.1-92.5 parts of liquid polyester polyol；0-5 parts of filler；5.6-11.9 parts of poly methylene poly phenyl poly isocyanate；0-20 parts of environment-friendly plasticizer.1) 66.1-92.5 parts of liquid polyester polyols, 0-5 parts of fillers and 0-20 parts of environment-friendly plasticizers it is characterized by: be added in the container with vacuum degasser by preparation method, it stirs evenly, vacuum dehydration 1-2h at a temperature of 100-110 DEG C is cooled to 80 DEG C；2) 5.6-11.9 parts of poly methylene poly phenyl poly isocyanates are added, stirs evenly, takes off under vacuum to still in 5-15min；3) it is poured into 80-90 DEG C of mold, in 100-110 DEG C of curing 16-24h, is cooled to room temperature, demould.Product of the invention has the advantages that hardness is low, environmentally friendly；Preparation method of the invention is simple and environmentally-friendly, and quality is stablized, and qualification rate is high.
Description
Technical field
The invention belongs to polyurethane elastomer fields, and in particular to a kind of low hardness polyurethane elastic body and its preparation side
Method.
Background technique
Polyurethane elastomer is answered extensively due to the comprehensive performance excellent with high intensity, high tenacity, wear-resisting, oil resistant etc.
For fields such as mine, papermaking, weaving, traffic, printings.Soft (being lower than 60A), casting type polyurethane was due to excellent
The advantages that wear-resisting, oil resistant, solvent resistant, simple preparation process, is widely used in rubber roller manufacture.
The common preparation method of the low hardness polyurethane elastic body of the prior art is that aggressiveness is added small molecular alcohol and cooperates increasing
Modeling agent is made.Such as disclosed in Patent Office of the People's Republic of China on December 11st, 2013, Publication No. CN103436004A is entitled
The patented technology of " a kind of preparation method of soft solvent resistant antistatic rubber roll ", it discloses synthesize NCO=2.0- first
The performed polymer of 4.0wt%, secondly polyol, small molecular alcohol, plasticizer rear preparation active hydrogen component admixed together, last pre-polymerization
Body and active hydrogen compounds is proportionally admixed together prepares low hardness cots.Chinese patent on November 27th, 2013 is open
, Publication No. CN103408719A, patent name is " a kind of soft solvent-proof polyurethane elastomer and preparation method "
Patented technology, it discloses feedstock oil two parts composition, component A is polyester polyol, TDI, plasticizer and filler composition, B component
It is made of chain extender, defoaming agent and catalyst, chain extender TIPA, DEA, TEA mixture or GLY, TMP, TME mixture.A and
B is mixed with soft solvent resistant rubber roller according to a certain percentage, is used for color coating print field.
Above method has the drawback that
1) performed polymer NCO used by is general lower (NCO=2.0-3.6wt%, qualification ± 0.2wt%), similarly matches
When side prepares low hardness cots, the NCO fluctuation between batch causes Article Stiffness Determination to fluctuate；
2) curing agent ratio is small (generally less than 4wt%) in preparation process, is easy to appear proportion inaccuracy and stirring is uneven
Even situation causes product surface hardness uneven or surface blemish；
3) low NCO performed polymer viscosity used in is big, inconvenient for operation, and bubble is difficult to exclude in preparation process, is easy to lead
Cause product surface and producing bubbles inside.
4) it needs to add catalyst in preparation process, catalyst is caused to remain；
5) most products are TDI system, and use process smell is big；
6) the plasticizer additive amount used is big, and low 50A generally requires addition 20wt% or more, can analyse after long-time use
Out；
In order to solve drawbacks described above, disclosed in Patent Office of the People's Republic of China's on May 31st, 2017, Publication No. CN106750133A,
Patent name is the patent application technology of " a kind of low hardness polyurethane rubber roller material and preparation method thereof ", it discloses using TDI,
The method of one method of polyester polyol and compounding small molecular alcohol prepares low hardness cots, hardness 45-55A, solve prepare it is low firmly
The NCO spent in rubber roller is fluctuated, viscosity is big, catalyst remains and plasticizer problem, but it still has following problem:
1) free TDI is used in preparation process, high temperature is readily volatilized, and not only smell is big, and is easy proportion imbalance；
2) preparation process uses two or three of small molecular alcohol, and single small molecular alcohol additive amount is small, is easy to appear proportion not
The accurate and non-uniform situation of stirring；
3) do not accomplish hardness lower than 45A or less product；
It 4) is solid under one of materials adipic acid-ethylene glycol -1,2-PD room temperature, it is inconvenient to use.
Disadvantages described above limits low hardness polyurethane in the use in rubber roller field.
Summary of the invention
It is an object of the invention to solve prior art low hardness polyurethane elastic body, there are hardness can not be lower than 45A, gas
The big defect of taste, preparation method, which exists, is easy proportion imbalance, and stirring is uneven, and defect inconvenient for operation provides a kind of soft
Polyurethane elastomer and preparation method thereof, elastomer hardness 15A-60A do not contain amine and small molecular alcohol chain extender, catalyst
And toluene di-isocyanate(TDI), preparation method is simple and environmentally-friendly, and quality is stablized, and qualification rate is high, can be widely applied to low hardness polyurethane
The field of elastomer, is particularly suitable for low hardness cots.
The present invention is achieved by the following technical solution:
I.e. a kind of low hardness polyurethane elastic body, it is characterised in that according to the mass fraction, raw material composition is as follows:
66.1-92.5 parts of liquid polyester polyol；
0-5 parts of filler；
5.6-11.9 parts of poly methylene poly phenyl poly isocyanate；
0-20 parts of environment-friendly plasticizer.
Fluid present invention polyester polyol and environment-friendly plasticizer ratio are high, and the polyurethane hardness of preparation is lower, on the contrary, isocyanic acid
Ester and proportion of filler are high, and the polyurethane hardness of preparation is higher, only in above-mentioned proportional region, is just able to achieve 15A-60A's
Hardness range.
Filler additive amount of the invention is more than 5 parts, and the viscosity of raw material can significantly increase, and influences to operate, and final product is easy
There is the defects of bubble.
Plasticizer additive amount of the invention is greater than 20 parts, and plasticizer effect is obvious, influences the last hardness of product.
Further, liquid polyester polyol of the invention is adipic acid-ethylene glycol -1,4-butanediol ester, adipic acid-one
Condensed binaryglycol ester, adipic acid-diglycol-glycol ester, succinic acid-diglycol ester, the contracting of succinic acid-one two
One or more of ethylene glycol-glycol ester mixture.
Liquid polyester polyol of the invention is industrialization polyester polyol, and raw material are easy to get, and cost performance is high.Other classes
The liquid polyester polyol of type, such as -3 first class -1,5 pentanediol liquid polyester polyol of adipic acid, price is 3 times of normal polyester polyol
More than, and manufacturing enterprise is few, herein not with selection.
It further, is liquid under liquid polyester polyol room temperature of the invention, hydroxyl value 38-56mgKOH/g, acid value:
0.2-0.4mgKOH/g, average functionality 2.0-2.3, moisture are less than 0.03wt%.
Polyester polyol hydroxyl is lower than 38KOH/g, and corresponding number-average molecular weight is greater than 3000g/mol, and PET conglutination is big, it has not been convenient to
Production and use.Polyester polyol hydroxyl is higher than 56KOH/g, and corresponding number-average molecular weight is less than 2000g/mol, does soft product institute
It need to add that plasticizer proportions are big, and final performance is bad.Acid value directly affects the activity of polyester polyol, and 0.2-0.4mgKOH/g's is poly-
Ester polyol has medium activity, can take into account the balance of operating time early period and later period demoulding time.Moisture is higher than
0.03wt%, later period spin cycle is long, influences the final coloration of product.
Further, filler of the invention is one of talcum powder, calcium carbonate, gas-phase silica or a variety of mixing
Object.
The above filler industrialization is easy to get, and good with polyester polyol compatibility, is easy dispersion.
Further, poly methylene poly phenyl poly isocyanate degree of functionality 2.4-3.0, NCO content 29- of the invention
32%, 25 DEG C of viscosity 100-300mPa.s.
Selected poly methylene poly phenyl poly isocyanate is industrialization product, needs not move through twice-modified, sexual valence
Than high.
Which type of the necessity that please describe above-mentioned each parameter it is unexpected to be just able to achieve that is, in parameter area
Effect, if will appear which type of problem outside parameter it can be illustrated by the way of comparison.
Further, environment-friendly plasticizer of the invention is 2,2,4- trimethyl -1,3- pentanediol diisobutyrates or dipropyl
Bisbenzoate or acetyl tri-n-butyl citrate.
Adjacent benzene class plasticizer such as dioctyl phthalate (DOP), dibutyl phthalate (DBP) are common for polyurethane
Plasticizer, cost performance is high, but not environmentally.Other environmentally friendly class plasticizer, such as hexamethylene -1,2- dioctyl phthalate dinonyl of Basf
(DINCH), price is high, and plasticizing efficiency is low.
A kind of preparation method of low hardness polyurethane elastic body material, it is characterised in that:
1) 66.1-92.5 parts of polyester polyol, 0-5 parts of fillers and 0-20 parts of environment-friendly plasticizers are added to and are taken off with vacuum
It in the container of device of air, stirs evenly, vacuum dehydration 1-2h at a temperature of 100-110 DEG C is cooled to 80 DEG C；
Dehydration temperaturre is lower than 100 DEG C, and abjection water needs the time long, influences production efficiency, and temperature is higher than 110 DEG C, will affect
Polyester color.
2) 5.6-11.9 parts of poly methylene poly phenyl poly isocyanates are added, stir evenly in 5-15min, taken off under vacuum to
It is still；
Mixing time is shorter than 5min, and stirring is uneven, and mixing time is longer than 15min, and viscosity increases obviously, is unfavorable for subsequent
Secondary deaeration processing.
3) it is poured into 80-90 DEG C of mold, in 100-110 DEG C of curing 16-24h, is cooled to room temperature, demould.
Mold temperature is lower than 80 DEG C, and reaction is slow and uneven, is higher than 90 DEG C, viscosity is low, and plasticizer is readily volatilized.After cure
Temperature is lower than 100 DEG C, and vulcanization not exclusively, is higher than 110 DEG C, product color change is obvious.
The present invention use liquid polyester polyol, filler, poly methylene poly phenyl poly isocyanate and environment-friendly plasticizer for
Main raw material(s) prepares low hardness polyurethane elastic body.Using liquid polyester polyol, use process does not have to toast for a long time, uses
It is more convenient；It is more environmentally-friendly relative to TDI system using poly methylene poly phenyl poly isocyanate；It, can using environment-friendly plasticizer
To further decrease the hardness of elastomer, polyurethane material is enhanced using filler.Preparation process uses a method technique,
Without synthesizing performed polymer, simple process, quality is stablized, and qualification rate is high.
Specific embodiment
The embodiment of technical solution of the present invention is described in detail below.Following embodiment is only used for clearly
Illustrate technical solution of the present invention, therefore be only used as example, and not intended to limit the protection scope of the present invention.It should be noted that
, unless otherwise indicated, technical term or scientific term used in this application should be fields technology people of the present invention
The ordinary meaning that member is understood.
Embodiment 1
By 88.1 parts of polyester polyol, (adipic acid-diglycol ester, hydroxyl value are 56.0mg KOH/g, acid value
0.2mgKOH/g, degree of functionality 2.0) it is added to in vacuum degasser container, it is dehydrated 1h at a temperature of 100 DEG C, then drops
Temperature is added 11.9 parts of poly methylene poly phenyl poly isocyanates, stirs evenly in 10min to 80 DEG C, is taken off under vacuum to still,
Enter into 80 DEG C of mold, in 100 DEG C of curing 16h, be cooled to room temperature, demoulds.Constant temperature and humidity places 48h, and testing elastic body is hard
Degree is 58A.
Embodiment 2
By 83.7 parts of polyester polyol, (adipic acid-ethylene glycol-diglycol ester, hydroxyl value are 56.0mg KOH/g, acid
Value 0.3mgKOH/g, degree of functionality 2.0), 5 parts of talcum powder are added to in vacuum degasser container, take off at a temperature of 105 DEG C
Then water 1h is cooled to 90 DEG C, 11.3 parts of poly methylene poly phenyl poly isocyanates are added, stir evenly in 10min, under vacuum
It takes off to still, is poured into 90 DEG C of mold, for 24 hours in 100 DEG C of curings, be cooled to room temperature, demould.Constant temperature and humidity places 48h, surveys
Examination elastomer hardness is 60A.
Embodiment 3
By 66.1 parts of polyester polyol, (adipic acid-ethylene glycol-butanediol ester, hydroxyl value are 56.0mg KOH/g, acid value
0.3mgKOH/g, degree of functionality 2.0), 2,2,4- 20 parts of trimethyl -1,3- pentanediol diisobutyrates (TXIB), 5 parts of calcium carbonate add
Enter to in vacuum degasser container, 1h is dehydrated at a temperature of 100 DEG C, is then cooled to 90 DEG C, methylene more than 8.9 parts is added
Quito polyphenyl polyisocyanate stirs evenly in 10min, is taken off under vacuum to still, is poured into 90 DEG C of mold, in 100 DEG C
Curing for 24 hours, is cooled to room temperature, and is demoulded.Constant temperature and humidity places 48h, and testing elastic body hardness is 40A.
Embodiment 4
By 92.5 parts of polyester polyol, (succinic acid-ethylene glycol-diglycol ester, hydroxyl value are 38.0mg KOH/g, acid
Value 0.4mgKOH/g, degree of functionality 2.0) it is added to in vacuum degasser container, 1h is dehydrated at a temperature of 110 DEG C, then
80 DEG C are cooled to, 7.5 parts of poly methylene poly phenyl poly isocyanates are added, are stirred evenly in 15min, is taken off under vacuum to still,
It is poured into 90 DEG C of mold, for 24 hours in 110 DEG C of curings, is cooled to room temperature, demoulds.Constant temperature and humidity places 48h, testing elastic body
Hardness is 35A.
Embodiment 5
By 74 parts of polyester polyol, (succinic acid-diglycol ester, hydroxyl value are 38.0mg KOH/g, acid value
0.3mgKOH/g, degree of functionality 2.0), 20 parts of dipropylene glycol dibenzoate (988 or 988SG), be added to vacuum outgas fill
It sets in container, 1h is dehydrated at a temperature of 110 DEG C, be then cooled to 80 DEG C, 6.0 parts of polymethylene polyphenyl polyisocyanic acid are added
Ester stirs evenly in 15min, is taken off under vacuum to still, is poured into 90 DEG C of mold, for 24 hours in 100 DEG C of curings, is cooled to room
Temperature, demoulding.Constant temperature and humidity places 48h, and testing elastic body hardness is 15A.
Embodiment 6
By 69.4 parts of polyester polyol, (succinic acid-diglycol ester, hydroxyl value are 38.0mg KOH/g, acid value
0.4mgKOH/g, degree of functionality 2.3), 20 parts of acetyl tri-n-butyl citrate (ATBC), 5 parts of talcum powder, be added to de- with vacuum
In device of air container, it is dehydrated 1h at a temperature of 110 DEG C, is then cooled to 80 DEG C, 5.6 parts of polymethylene polyphenyl polyisocyanate cyanogen are added
Acid esters stirs evenly in 15min, is taken off under vacuum to still, is poured into 90 DEG C of mold, for 24 hours in 100 DEG C of curings, is cooled to
Room temperature, demoulding.Constant temperature and humidity places 48h, and testing elastic body hardness is 20A.
Use polyurethane made from polyurethane elastomer produced by the present invention and mono- prior art TDI pre-polymerization method, TDI method
The performance comparison of elastomer is as follows
* 1 grade: 2 grades of odorlessness: slightly 3 grades of smell: it is flavoursome, but 4 grades are not stimulated: 5 grades of irritating smell: strong thorn
Swash 6 grades of smell: intolerable taste
The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；Although referring to aforementioned each reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified, or equivalent substitution of some or all of the technical features；And
These are modified or replaceed, the range for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution,
It should all cover within the scope of the claims and the description of the invention.
Claims (7)
1. a kind of low hardness polyurethane elastic body, it is characterised in that according to the mass fraction, raw material composition is as follows:
66.1-92.5 parts of liquid polyester polyol；
0-5 parts of filler；
5.6-11.9 parts of poly methylene poly phenyl poly isocyanate；
0-20 parts of environment-friendly plasticizer.
2. low hardness polyurethane elastic body material according to claim 1, which is characterized in that the liquid polyester polyol is
Adipic acid-ethylene glycol -1,4- butanediol ester, adipic acid-diglycol ester, adipic acid-diglycol-ethylene glycol
The mixing of one or more of ester, succinic acid-diglycol ester, succinic acid-diglycol-glycol ester
Object.
3. polyester polyol according to claim 2, which is characterized in that be liquid, hydroxyl under liquid polyester polyol room temperature
Value 38-56mgKOH/g, acid value: 0.2-0.4mgKOH/g, average functionality 2.0-2.3, moisture are less than 0.03wt%.
4. low hardness polyurethane rubber roller material according to claim 1, which is characterized in that filler is talcum powder, calcium carbonate, gas
One of phase white carbon black or a variety of mixtures.
5. low hardness polyurethane elastic body material according to claim 1, which is characterized in that polymethylene polyphenyl polyisocyanate cyanogen
Acid esters degree of functionality 2.4-3.0, NCO content 29-32%, 25 DEG C of viscosity 100-300mPa.s.
6. low hardness polyurethane elastic body material according to claim 1, which is characterized in that environment-friendly plasticizer 2,2,4- tri-
Methyl-1,3- pentanediol diisobutyrate, dipropylene glycol dibenzoate or acetyl tri-n-butyl citrate.
7. a kind of preparation method of low hardness polyurethane elastic body material, it is characterised in that:
1) 66.1-92.5 parts of liquid polyester polyols, 0-5 parts of fillers and 0-20 parts of environment-friendly plasticizers are added to and are taken off with vacuum
It in the container of device of air, stirs evenly, vacuum dehydration 1-2h at a temperature of 100-110 DEG C is cooled to 80 DEG C；
2) 5.6-11.9 parts of poly methylene poly phenyl poly isocyanates are added, stirs evenly, takes off under vacuum to nothing in 5-15min
Bubble；
3) it is poured into 80-90 DEG C of mold, in 100-110 DEG C of curing 16-24h, is cooled to room temperature, demould.
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| CN103436004A (en) * | 2013-08-30 | 2013-12-11 | 广州华工百川科技股份有限公司 | Low-hardness solvent-resistant antistatic polyurethane elastomer and preparation method thereof |
| CN109694491A (en) * | 2018-12-25 | 2019-04-30 | 山东一诺威聚氨酯股份有限公司 | The PVC polyurethane coating elastomer and preparation method thereof of PhastGel demoulding |
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2019
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