CN104448223B - Polyurethane self heat absorption low-temperature filling material and preparation method thereof - Google Patents
Polyurethane self heat absorption low-temperature filling material and preparation method thereof Download PDFInfo
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- CN104448223B CN104448223B CN201410699395.9A CN201410699395A CN104448223B CN 104448223 B CN104448223 B CN 104448223B CN 201410699395 A CN201410699395 A CN 201410699395A CN 104448223 B CN104448223 B CN 104448223B
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- heat absorption
- self heat
- filling material
- fire retardant
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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
-
- 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
- C08G18/48—Polyethers
- C08G18/4804—Two or more polyethers of different physical or chemical nature
- C08G18/482—Mixtures of polyethers containing at least one polyether containing nitrogen
-
- 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
- C08G18/48—Polyethers
- C08G18/4829—Polyethers containing at least three hydroxy groups
-
- 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
- C08G18/48—Polyethers
- C08G18/50—Polyethers having heteroatoms other than oxygen
- C08G18/5021—Polyethers having heteroatoms other than oxygen having nitrogen
- C08G18/5024—Polyethers having heteroatoms other than oxygen having nitrogen containing primary and/or secondary amino groups
-
- 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
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/521—Esters of phosphoric acids, e.g. of H3PO4
-
- 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
- C08G2110/00—Foam properties
- C08G2110/0083—Foam properties prepared using water as the sole blowing agent
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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)
Abstract
The invention belongs to polyurethane material preparing technical field, and in particular to a kind of polyurethane self heat absorption low-temperature filling material and preparation method thereof.Described material is made up of component A and B component, and wherein component A is made up of polyalcohol, water, auxiliary agent and fire retardant, and B component is made up of polyisocyanates and fire retardant.The present invention is by the selection to polyalcohol, auxiliary agent, fire retardant and isocyanates, larger amount of water is added in reaction system, the heat that system is produced is siphoned away by the evaporation for having neither part nor lot in the water of reaction, internal reaction temperature is not higher than 95 DEG C, once solve the problems, such as that anti-flammability is not good；Flame Retardancy of the present invention is good, material liquid convenient transportation, low viscosity, good fluidity, storage stability are good；Raw material is green, pollution-free, does not contain volatile solvent, and any toxic gas is not produced, harmless.Preparation method of the invention is simple and easy to apply, be easily achieved.
Description
Technical field
The invention belongs to polyurethane material preparing technical field, and in particular to a kind of polyurethane self heat absorption low-temperature filling material
And preparation method thereof.
Background technology
With a large amount of exploitations of China's coal-mine, it is frequently run onto tunnel and coal-face roof pressure is larger, crushing voerhead coal,
The problem of slump is produced in tunneling process, and then to roof fall area top cavity injection filler, then carry out tunnel-surrounding note
Slurry is reinforced, and after after surrounding rock consolidation at fall of ground and wall caving, then carries out driving exploitation；On the other hand, goaf cavity easily makes
Gas gathers, and is susceptible to explosion danger, it is therefore desirable to carry out filling treatment to goaf.At present usually using phenolic material
Material, ureaformaldehyde material or polyurethane material are filled, and phenolic and ureaformaldehyde class material are produced when having big raw material corrosivity, foaming
The problem that raw penetrating odor, storage stability are not enough, foams are crisper, conventional polyurethanes class material usually internal temperature high resistant
Combustion property is not good.
The content of the invention
It is an object of the invention to provide a kind of polyurethane self heat absorption low-temperature filling material, the raw material of Conventional filling material is solved
Corrosivity is big, foaming when produce the problem and conventional polyurethanes class that penetrating odor, storage stability are not enough, foams are crisper
The not good problem of material internal temperature high flame retardant；Present invention simultaneously provides its preparation method.
Polyurethane self heat absorption low-temperature filling material of the present invention, is made up of component A and B component, when using component A and
B component is according to mass ratio 1:1 is mixed to prepare；
It is as follows that component A is calculated in mass percent composition：
It is as follows that B component is calculated in mass percent composition：
Polyisocyanates：60-100%
Fire retardant b：0-40%
Wherein：
Described PPG a is that degree of functionality is 3, and the expoxy propane oxirane copolymerization of molecular weight 3000-6000 gathers
Ethoxylated polyhydric alcohol, wherein ethylene oxide content are more than or equal to 10%.
Described PPG b is that degree of functionality is 4, and molecular weight is the ethylenediamine based polyether polyol of 280-550.
Foam stabiliser is organosilicone surfactants in described component A.
Catalyst is the alkylene triamine of pentamethyl two, trimethylene diamine, double (dimethylaminoethyls) in described component A
One or more in ether and dimethylaminoethoxyethanol.Wherein, the preferred pentamethyl two of the alkylene triamine of pentamethyl two is sub-
Ethyl triamine.
Fire retardant a is water-soluble flame retardant in described component A.It is preferred that the safe FR425 of Suzhou peace letter.
Polyisocyanates is different polyphenyl polymethylene polyisocyanates, Carbodiimide-Modified two in described B component
One or more in cyanate or Isocyanate prepolymers body.
Fire retardant b is phosphate ester flame retardants in described B component.Fire retardant b preferably phosphoric acids three (2- chloropropyls) ester, letter
Claim TCPP.
The preparation method of polyurethane self heat absorption low-temperature filling material of the present invention, comprises the following steps：
(1) component A material is prepared：Good various raw material for standby are first weighed according to proportioning；By load weighted PPG a, gather
Ethoxylated polyhydric alcohol b, water input mixing kettle in and stir；Then foam stabiliser, catalyst, fire retardant a are added into mixing kettle
Middle stirring 1~2 hour, stirs uniform discharge.
(2) B component material is prepared：By in polyisocyanates, fire retardant b input mixing kettles, 1-2 is mixed under room temperature condition small
When, discharged after stirring, nitrogen displacement packaging.
(3) when using, A, B component material are pressed into A:B=1:1 quality is than mixed foaming.
The invention has the advantages that：
The present invention is added relatively large by the selection to polyalcohol, auxiliary agent, fire retardant and isocyanates in reaction system
Water, by have neither part nor lot in the evaporation of water of reaction siphon away system produce heat, internal reaction temperature is not higher than 95 DEG C, once
Solve the problems, such as that anti-flammability is not good；Flame Retardancy of the present invention is good, material liquid convenient transportation, low viscosity, good fluidity, storage are steady
It is qualitative good；Raw material is green, pollution-free, does not contain volatile solvent, and any toxic gas is not produced, harmless.The present invention
Preparation method it is simple and easy to apply, be easily achieved.
Specific embodiment
The present invention is described further with reference to embodiments.
Embodiment 1
Described polyurethane self heat absorption low-temperature filling material is obtained by following components according to following steps：
(1) component A material 100Kg is prepared, PPG a is weighed respectively, and (15%) EO accounts for for 3 degrees of functionality, molecular weight 3500
24.6Kg, PPG b (4 degrees of functionality, the ethylenediamine based polyether polyol of molecular weight 350) 36.7Kg, foam stabiliser
(L6950, the U.S. steps figure) 1.2Kg, water 24.6Kg, five methyl diethylentriamine 0.3Kg, dimethylaminoethoxyethanol
0.3Kg, water-soluble flame retardant (FR425, Suzhou peace letter is safe) 12.3Kg, mixing kettle is loaded by load weighted polyether polyols alcohol and water
Interior stirring, is subsequently adding load weighted foam stabiliser, catalyst, fire retardant, sequentially adds in reactor, stirs at normal temperatures
Uniformly, after sampling detection is qualified, you can barrelling.
(2) B component material 100Kg is prepared, by the poly methylene poly phenyl poly isocyanate 44V20 (Bayer) of accurate metering
75Kg, fire retardant TCPP 25Kg, put into reactor in order, and stirring mixing 1 hour, discharging after sampling Detection is qualified, nitrogen is put
Change and pack.
A, B component are pressed into A:B=100:100 weight proportions, spray grouting pump and are mixed and made into polyurethane using double-liquid high pressure
Low-temperature filling foam.
Embodiment 2
Described polyurethane self heat absorption low-temperature filling material is obtained by following components according to following steps：
(1) component A material 100Kg is prepared, PPG a is weighed respectively, and (25%) EO accounts for for 3 degrees of functionality, molecular weight 6000
23.5Kg, PPG b (4 degrees of functionality, the ethylenediamine based polyether polyol of molecular weight 430) 19.3Kg, foam stabiliser
(B8532, win wound Degussa) 0.8Kg, water 42.7Kg, five methyl diethylentriamine 0.2Kg, trimethylene diamine 0.3Kg, two
Methylaminoethoxy ethanol 0.4Kg, water-soluble flame retardant (FR425, Suzhou peace letter is safe) 12.8Kg, by load weighted polyether polyols
Alcohol and water loads stirring in mixing kettle, is subsequently adding load weighted foam stabiliser, catalyst, fire retardant, sequentially adds reaction
In kettle, stir at normal temperatures, after sampling detection is qualified, you can barrelling.
(2) B component material 100Kg, accurate metering poly methylene poly phenyl poly isocyanate PM200 (Yantai Wanhua) are prepared
100Kg。
A, B component are pressed into A:B=100:100 weight proportions are mixed and made into polyurethane low-temperature filling foam.
Embodiment 3
Described polyurethane self heat absorption low-temperature filling material is obtained by following components according to following steps：
(1) component A material 100Kg is prepared, PPG a is weighed respectively, and (15%) EO accounts for for 3 degrees of functionality, molecular weight 5000
24.5Kg, PPG b (4 degrees of functionality, the ethylenediamine based polyether polyol of molecular weight 350) 24.5Kg, foam stabiliser
(L6970, the U.S. steps figure) 1Kg, water 44.1Kg, dimethylaminoethoxyethanol 1Kg, water-soluble flame retardant (FR425, Suzhou peace
It is great safe) 4.9Kg, load weighted polyether polyols alcohol and water is loaded in mixing kettle and is stirred, it is subsequently adding load weighted foam stabilization
Agent, catalyst, fire retardant, sequentially add in reactor, stir at normal temperatures, after sampling detection is qualified, you can barrelling.
(2) B component material 100Kg is prepared, by the poly methylene poly phenyl poly isocyanate 44V20 (Bayer) of accurate metering
90Kg, fire retardant TCPP 10Kg, put into reactor in order, and stirring mixing 1 hour, discharging after sampling Detection is qualified, nitrogen is put
Change and pack.
A, B component are pressed into A:B=100:100 weight proportions are mixed and made into polyurethane low-temperature filling foam.
The product of embodiment 1-3 is detected, it is as a result as follows：
The finished product detection tables of data of the embodiment 1-3 of table 1
Claims (9)
1. a kind of polyurethane self heat absorption low-temperature filling material, it is characterised in that be made up of component A and B component, when using component A and
B component is according to mass ratio 1:1 is mixed to prepare, wherein：
It is as follows that component A is calculated in mass percent composition：
It is as follows that B component is calculated in mass percent composition：
Polyisocyanates：60-100%
Fire retardant b：0-40%
Wherein：
PPG a is that degree of functionality is 3, and molecular weight is the expoxy propane oxirane copolyether polyalcohol of 3000-6000,
Wherein ethylene oxide content is more than or equal to 10%；
PPG b is that degree of functionality is 4, and molecular weight is the ethylenediamine based polyether polyol of 280-550.
2. polyurethane self heat absorption low-temperature filling material according to claim 1, it is characterised in that foam stabiliser is organic
Silicon class surfactant.
3. polyurethane self heat absorption low-temperature filling material according to claim 1, it is characterised in that catalyst is pentamethyl two
One or more in alkylene triamine, trimethylene diamine, double (dimethylaminoethyl) ethers or dimethylaminoethoxyethanol.
4. polyurethane self heat absorption low-temperature filling material according to claim 3, it is characterised in that the alkylidene three of pentamethyl two
Amine is five methyl diethylentriamine.
5. polyurethane self heat absorption low-temperature filling material according to claim 1, it is characterised in that fire retardant a hinders for water-soluble
Combustion agent.
6. polyurethane self heat absorption low-temperature filling material according to claim 1, it is characterised in that polyisocyanates is many benzene
One or more in Quito methylene polyisocyanates, Carbodiimide-Modified diisocyanate or Isocyanate prepolymers body.
7. polyurethane self heat absorption low-temperature filling material according to claim 1, it is characterised in that fire retardant b is phosphoric acid ester
Fire retardant.
8. polyurethane self heat absorption low-temperature filling material according to claim 7, it is characterised in that fire retardant b is tricresyl phosphate
(2- chloropropyls) ester.
9. the preparation method of any described polyurethane self heat absorption low-temperature filling materials of a kind of claim 1-8, it is characterised in that
Comprise the following steps：
(1) component A material is prepared：Good various raw materials are first weighed according to proportioning；By load weighted PPG a, PPG
B, water input mixing kettle in and stir；Then will foam stabiliser, catalyst, fire retardant a add mixing kettle in stirring 1~
2 hours, stirred discharging；
(2) B component material is prepared：By in polyisocyanates, fire retardant b input mixing kettles, mix 1~2 hour under room temperature condition, stir
Mix uniform discharge, nitrogen displacement packaging；
(3) when using, A, B component material are pressed into A:B=1:1 mass ratio is mixed to get polyurethane self heat absorption low-temperature filling material.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104774316A (en) * | 2015-04-28 | 2015-07-15 | 山东固安特新材料科技股份有限公司 | Polyurethane all-water foaming material for coal mine filling and preparation method thereof |
| CN105175673B (en) * | 2015-06-18 | 2018-07-03 | 山西誉邦科技有限公司 | A kind of low polyurethane filler and preparation method thereof that generates heat of coal mine high water content |
| CN105017758A (en) * | 2015-08-14 | 2015-11-04 | 大同煤矿集团有限责任公司 | Filling sealing material for coal mine |
| CN107189668B (en) * | 2017-06-28 | 2019-11-08 | 山东一诺威新材料有限公司 | Environment-friendly type mining low-temperature sprayed on material and preparation method thereof |
| CN108314772A (en) * | 2018-03-21 | 2018-07-24 | 山西凝固力新型材料有限公司 | Enhance modified injecting paste material based on superfine fibre |
| CN110372844B (en) * | 2019-06-18 | 2021-09-21 | 中路高科(北京)公路技术有限公司 | Polyurethane grouting material, preparation method and application |
| CN114057974A (en) * | 2021-10-08 | 2022-02-18 | 山东北理华海复合材料有限公司 | Polyurethane low-heat-release foaming composite material and preparation method thereof |
| CN115181241A (en) * | 2022-08-26 | 2022-10-14 | 河北浩威旭光新材料科技有限公司 | Organic polymer ultralow-temperature reinforcing material for coal rock mass |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102532455A (en) * | 2011-12-23 | 2012-07-04 | 山东东大一诺威新材料有限公司 | Polyurethane polymer material for coal rock mass reinforcement and preparation method thereof |
| CN102643531A (en) * | 2012-04-25 | 2012-08-22 | 辽宁工程技术大学 | Self-temperature-limited polyurethane grouting material and preparation method thereof |
| CN103265681A (en) * | 2013-05-15 | 2013-08-28 | 陕西煤业化工技术研究院有限责任公司 | Coal-mine gas drainage hole drilling/sealing material and preparation method thereof |
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2014
- 2014-11-27 CN CN201410699395.9A patent/CN104448223B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102532455A (en) * | 2011-12-23 | 2012-07-04 | 山东东大一诺威新材料有限公司 | Polyurethane polymer material for coal rock mass reinforcement and preparation method thereof |
| CN102643531A (en) * | 2012-04-25 | 2012-08-22 | 辽宁工程技术大学 | Self-temperature-limited polyurethane grouting material and preparation method thereof |
| CN103265681A (en) * | 2013-05-15 | 2013-08-28 | 陕西煤业化工技术研究院有限责任公司 | Coal-mine gas drainage hole drilling/sealing material and preparation method thereof |
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