CN107586383A - The process for purification of VOC content and smell in a kind of reduction PPG - Google Patents
The process for purification of VOC content and smell in a kind of reduction PPG Download PDFInfo
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- CN107586383A CN107586383A CN201710986027.6A CN201710986027A CN107586383A CN 107586383 A CN107586383 A CN 107586383A CN 201710986027 A CN201710986027 A CN 201710986027A CN 107586383 A CN107586383 A CN 107586383A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000000746 purification Methods 0.000 title claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000010792 warming Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000000706 filtrate Substances 0.000 claims abstract description 6
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 15
- 230000018044 dehydration Effects 0.000 claims description 13
- 238000006297 dehydration reaction Methods 0.000 claims description 13
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 9
- 239000001294 propane Substances 0.000 claims description 8
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 5
- 229910052700 potassium Inorganic materials 0.000 claims description 5
- 239000011591 potassium Substances 0.000 claims description 5
- 229910001415 sodium ion Inorganic materials 0.000 claims description 5
- 125000005702 oxyalkylene group Chemical group 0.000 claims description 4
- 150000005846 sugar alcohols Polymers 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 150000001340 alkali metals Chemical class 0.000 claims description 3
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims description 2
- 238000006555 catalytic reaction Methods 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- -1 kalium ion Chemical class 0.000 abstract description 25
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 21
- 239000000126 substance Substances 0.000 abstract description 11
- 239000000391 magnesium silicate Substances 0.000 abstract description 8
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 abstract description 3
- 235000019792 magnesium silicate Nutrition 0.000 abstract description 3
- 229910052919 magnesium silicate Inorganic materials 0.000 abstract description 3
- 229920001451 polypropylene glycol Polymers 0.000 description 61
- 239000012043 crude product Substances 0.000 description 21
- STNJBCKSHOAVAJ-UHFFFAOYSA-N Methacrolein Chemical compound CC(=C)C=O STNJBCKSHOAVAJ-UHFFFAOYSA-N 0.000 description 18
- 239000000047 product Substances 0.000 description 18
- 229920000570 polyether Polymers 0.000 description 13
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 8
- 229920005862 polyol Polymers 0.000 description 7
- ULWHHBHJGPPBCO-UHFFFAOYSA-N propane-1,1-diol Chemical class CCC(O)O ULWHHBHJGPPBCO-UHFFFAOYSA-N 0.000 description 7
- 239000004721 Polyphenylene oxide Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 6
- 150000003077 polyols Chemical class 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- ATVJXMYDOSMEPO-UHFFFAOYSA-N 3-prop-2-enoxyprop-1-ene Chemical compound C=CCOCC=C ATVJXMYDOSMEPO-UHFFFAOYSA-N 0.000 description 5
- 239000003999 initiator Substances 0.000 description 5
- 235000012243 magnesium silicates Nutrition 0.000 description 5
- 238000007670 refining Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 239000003963 antioxidant agent Substances 0.000 description 4
- 230000003078 antioxidant effect Effects 0.000 description 4
- 235000011187 glycerol Nutrition 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000012153 distilled water Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- POLCUAVZOMRGSN-UHFFFAOYSA-N dipropyl ether Chemical compound CCCOCCC POLCUAVZOMRGSN-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000009967 tasteless effect Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006049 ring expansion reaction Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
Landscapes
- Polyethers (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention provides the process for purification of VOC content and smell in a kind of reduction PPG, is related to chemical field.The process for purification, comprises the following steps：The magnesium silicate or alumina silicate or its mixture of refined PPG quality 0.05 1.5% are treated in refined PPG is treated, described in addition, is warming up to 95 115 DEG C under nitrogen atmosphere, keeping temperature is constant and stirs；（2）60 90 DEG C are cooled to, the water of PPG quality 5 10% to be refined described in addition, keeping temperature is constant and stirs；（3）By step（2）Resulting material filters after processing, takes filtrate to be dehydrated, the PPG after being refined.This hair process for purification, the kalium ion and natrium ion in PPG can be effectively removed, in the case where ensureing that PPG pH value is not too high, significantly reduce the taste and VOC content of PPG, especially significantly reduce the concentration of formaldehyde.
Description
Technical field
The present invention relates to chemical field, and in particular to the refined side of VOC content and smell in a kind of reduction PPG
Method.
Background technology
PPG is the important source material of polyurethane material, the every field being widely applied in life.With people
Growth in the living standard, environment protection health is increasingly paid close attention to, VOC (VOC) problem in polyurethane material
Have become the focus of public attention.Basic material of the PPG as polyurethane material, is adopted substantially in building-up process
It is initiator with small molecule polyol or amine, expoxy propane is catalyzed using alkali metal or epoxyethane ring-expansion polymerization forms macromolecular
Polymer, raw material is brought into polymerization process, and side reaction and the presence of unreacted monomer and oligomer can all increase polyether polyols
VOC content in alcohol.How to remove these volatile organic matters and reduce the smell of polyethers, turn into domestic and international polyethers manufacturer all in product
The problem of pole is paid close attention to.
In the prior art, the PPG pH after refining is in alkalescent, the still aldehyde material containing higher concentration, especially
It is the formaldehyde larger to human injury, therefore VOC content is higher and taste is heavier.Because some polyethers antioxidant are sensitive to pH,
It can be developed the color under weak basic condition, when the pH of PPG is in alkalescent, it is more that follow-up addition polyethers antioxidant can increase polyethers
The colourity and taste of first alcohol.In addition, filtering, dehydration after water absorption, are easily caused compared with heavy load to filter.
The content of the invention
The purpose of this hair is to provide the process for purification of VOC content and smell in a kind of reduction PPG, can be effective
The kalium ion and natrium ion in PPG is removed, in the case where ensureing that PPG pH value is not too high, significantly reduces polyethers
The taste and VOC content of polyalcohol, especially significantly reduce the concentration of formaldehyde.
The purpose of the present invention adopts the following technical scheme that realization.
The process for purification of VOC content and smell in a kind of reduction PPG, comprises the following steps：
(1) treat refined PPG quality 0.05-1.5%'s in refined PPG is treated, described in addition
Magnesium silicate or alumina silicate or its mixture, 95-115 DEG C are warming up under nitrogen atmosphere, keeping temperature is constant and stirs；
(2) 60-90 DEG C is cooled to, PPG quality 5-10% to be refined water, keeping temperature are constant described in addition
And stir；
(3) resulting material after step (2) processing is filtered, takes filtrate to be dehydrated, the PPG after being refined.
In the present invention, it is described treat refined PPG be by polyalcohol and oxyalkylene under the catalysis of alkali metal
Obtained after generation polymerisation.
In the present invention, the oxyalkylene is expoxy propane, oxirane or both mixture；The polyether polyols
The degree of functionality of alcohol is 1-8, number-average molecular weight 400-12000.
In preferable technical scheme, keeping temperature is constant in step (1) and the time of stirring is 0.5-2 hours.
In preferable technical scheme, keeping temperature is constant in step (2) and the time of stirring is 1-2 hours.
In the present invention, potassium, sodium ion total content are less than 5ppm in PPG after filtering.
In the present invention, temperature during dehydration is 105-125 DEG C, and vacuum during dehydration is less than -0.09Mpa.
In the present invention, moisture is less than or equal to 0.1% in the PPG after dehydration, and pH is 5~7.
Inventor passes through many experiments, has been surprisingly found that directly filtering can significantly reduce using after magnesium silicate and water absorption
VOC content and taste in PPG, especially significantly reduce the concentration of formaldehyde.In addition, the present invention is carried out before dehydration
Filtering, the viscosity of PPG when reducing filtering, the load of filter is alleviated, the pH value of PPG is presented after refining
Faintly acid, add tolerance when follow-up antioxidant adds so that some can be added to the sensitive antioxidant to develop the color of pH
Enter.Kalium ion and natrium ion concentration reduces in gained PPG after this forwarding method is refined.
Embodiment
The explanation present invention with reference to embodiments, but the present invention is not only limited to these embodiments.
Embodiment 1 refines PPG a crude products
With oxirane sudden reaction occurs in the presence of KOH for initiator propane diols, and PPG a crude products are made.Urge
Agent KOH dosage is the 0.2% of reactant (propane diols and oxirane) gross mass.PPG a number-average molecular weight
For 500.
1. refining PPG a crude products using the inventive method, comprise the following steps：
(1) in the 2L stainless steel cauldrons for having 1000g PPG a crude products, 10g magnesium silicates are added, in nitrogen
Under atmosphere, open and stir and be warming up to 105 ± 5 DEG C, then keeping temperature is 105 ± 5 DEG C constant, stirs 1h.
(2) 75 ± 5 DEG C are cooled to, sucks 80g distilled water, temperature keeps 75 ± 5 DEG C of constant, stirring 1h.
(3) press filtration, after kalium ion and natrium ion total concentration is less than 5ppm, take filtrate to be placed in reactor, open vacuum plant and take out
Vacuum, when vacuum is less than -0.09Mpa in reactor, 110 ± 5 DEG C are warming up to, keeps this temperature-resistant, be dehydrated 2h, produce into
Product PPG a.
2. control methods one
PPG a crude products are refined using control methods one, wherein step (1) and (2) are the same as of the invention in the present embodiment
Method, step (3) are as follows：Open vacuum plant to vacuumize, when vacuum is less than -0.09Mpa in reactor, be warming up to 110 ± 5
DEG C, keep this temperature-resistant, be dehydrated 2h, then press filtration, after kalium ion and natrium ion total concentration is less than 5ppm, obtain finished product polyether polyols
Alcohol a.
3. control methods two：
PPG a crude products are refined using control methods two, the 2L for having 1000g PPG a crude products is stainless
Steel reactor is heated to 70 DEG C, adds 10g pure water and 10g magnesium silicates, stirs 30 minutes, by gained PPG weight after filtering
It is new to add in reactor, 10g pure water and 10g diatomite are added, after stirring 30 minutes, carries out vacuum dehydration 1 hour, temperature is protected
Hold at 105 DEG C, be then filtrated to get finished product PPG a.
Formaldehyde in the obtained finished product PPG a of detection each method, acetaldehyde, methacrylaldehyde, propane diols allyl ether and its
PH, moisture and the potassium, sodium ions content of its volatile substances content and product.Wherein formaldehyde, acetaldehyde, methacrylaldehyde, propane diols alkene
Propyl ether and other volatile substance contents use liquid chromatographic detection.Specific testing result is shown in Table 1.This hair as can be seen from Table 1
After bright method is refined, PPG a taste is significantly reduced, significantly reduces formaldehyde, acetaldehyde, methacrylaldehyde, propane diols alkene
The content of propyl ether and other volatile substances, pH are in faintly acid.
The finished product PPG a of table 1 performance indications
Embodiment 2 refines PPG b crude products
With expoxy propane sudden reaction occurs in the presence of KOH for initiator glycerine, and PPG b crude products are made.Urge
Agent KOH dosages are the 0.25% of reactant (glycerine and expoxy propane) gross mass.PPG b number-average molecular weight is
3000。
1. refining PPG b crude products using the inventive method, comprise the following steps：
(1) in the 2L stainless steel cauldrons for having 1000g PPG b crude products, 9g alumina silicate is added, in blanket of nitrogen
Under, open and stir and be warming up to 100 ± 5 DEG C, keeping temperature is 100 ± 5 DEG C constant, stirs 1.5h.
(2) reactor temperature is reduced to 80 DEG C, 90g distilled water is sucked, after temperature keeps 80 ± 5 DEG C of stirring 2h.
(3) press filtration, after kalium ion and natrium ion total concentration is less than 5ppm, take filtrate to be placed in reactor, open vacuum plant and take out
Vacuum, when vacuum is less than -0.09Mpa in reactor, 115 ± 5 DEG C are warming up to, 115 ± 5 DEG C of keeping temperature is constant, dehydration
2h, finished product PPG b.
2. control methods one
PPG b crude products are refined using control methods one, wherein step (1) and (2) are the same as of the invention in the present embodiment
Method, step (3) are as follows：Open vacuum plant to vacuumize, when vacuum is less than -0.09Mpa in reactor, be warming up to 115 ± 5
DEG C, keep this temperature-resistant, dehydration 2h, then press filtration, after kalium ion and natrium ion total concentration is less than 5ppm, finished product polyether polyols
Alcohol b.
Control methods two：
PPG b crude products are refined using control methods two, the 2L for having 1000g PPG a crude products is stainless
Steel reactor is heated to 80 DEG C, adds 20g pure water and 20g magnesium silicates, stirs 30 minutes, (kalium ion and natrium ion total concentration is small after filtering
In 5ppm), gained PPG is rejoined in reactor, adds 20g pure water and 20g diatomite, is stirred 30 minutes
Afterwards, vacuum dehydration 1 hour is carried out, temperature is maintained at 105 DEG C, is then filtrated to get finished product PPG b.
It is formaldehyde in the obtained finished product PPG b of detection each method, acetaldehyde, methacrylaldehyde, propane diols allyl ether, other
The pH of volatile substance content and product, moisture and potassium, sodium ions content.Wherein formaldehyde, acetaldehyde, methacrylaldehyde, propane diols allyl
Base ether and other volatile substance contents use liquid chromatographic detection.After the inventive method is refined as can be seen from Table 2, polyether polyols
Alcohol b is tasteless, significantly reduces the content of formaldehyde, acetaldehyde, methacrylaldehyde, propane diols allyl ether and other volatile substances, pH is in weak
It is acid.
Table 2：PPG b performance indications
Embodiment 3 refines PPG c crude products
Initiator is glycerine and pentaerythrite mixture.By the initiator and the mixture of expoxy propane and oxirane
Sudden reaction occurs in the presence of KOH, PPG c crude products are made.Its ethylene oxide accounts for oxirane and expoxy propane
The 15% of mixture gross mass.Catalyst KOH dosages are reactant (glycerine, pentaerythrite, expoxy propane and oxirane)
The 0.3% of gross mass.PPG c number-average molecular weight is 3000, average functionality 3.5.
1. refining PPG c crude products using the inventive method, comprise the following steps：
(1) in the 2L stainless steel cauldrons for having 1000g PPG c crude products, 12g magnesium silicates and alumina silicate are added
Mixture (mass ratio 4:6), under nitrogen atmosphere, open and stir and be warming up to 95 ± 5 DEG C, then keeping temperature is 95 ± 5
It is DEG C constant, stir 1h.
(2) reactor temperature is reduced to 70 DEG C, sucks 100g distilled water, and keeping temperature is 80 ± 5 DEG C constant, stirring
1h。
(3) by material in reactor press filtration, after kalium ion and natrium ion total concentration is less than 5ppm, filtrate is taken to be placed in reactor,
Open vacuum plant to vacuumize, when vacuum is less than -0.09Mpa in reactor, be warming up to 105 ± 5 DEG C, keeping temperature 105
± 5 DEG C constant, is dehydrated 1.5h, obtains finished product PPG c.
2. control methods one
PPG c crude products are refined using control methods one, wherein step (1) and (2) are the same as of the invention in the present embodiment
Method, step (3) are as follows：Open vacuum plant to vacuumize, when vacuum is less than -0.09Mpa in reactor, be warming up to 105 ± 5
DEG C keep this temperature-resistant, be dehydrated 1.5h, then press filtration, after kalium ion and natrium ion total concentration is less than 5ppm, finished product polyethers is more
First alcohol c.
4. control methods two：
PPG c crude products are refined using control methods two, the 2L for having 1000g PPG c crude products is stainless
Steel reactor is heated to 80 DEG C, adds 10g pure water and 10g magnesium silicates, stirs 30 minutes, (kalium ion and natrium ion total concentration is small after filtering
In 5ppm) gained PPG is rejoined in reactor, 10g pure water and 10g diatomite are added, is stirred 30 minutes
Afterwards, vacuum dehydration 1 hour is carried out, temperature is maintained at 105 DEG C, is then filtrated to get finished product PPG c.
It is formaldehyde in the obtained finished product PPG c of detection each method, acetaldehyde, methacrylaldehyde, propane diols allyl ether, other
The pH of volatile substance content and product, moisture and potassium, sodium ions content.Wherein formaldehyde, acetaldehyde, methacrylaldehyde, propane diols allyl
Base ether and other volatile substance contents use liquid chromatographic detection.After the inventive method is refined as can be seen from Table 3, polyether polyols
Alcohol c is tasteless, significantly reduces the content of formaldehyde, acetaldehyde, methacrylaldehyde, propane diols allyl ether and other volatile substances, pH is in weak
It is acid.
Table 3：Finished product PPG c performance indications
Claims (8)
1. the process for purification of VOC content and smell in a kind of reduction PPG, it is characterised in that comprise the following steps：
（1）Refined PPG quality 0.05-1.5 % silicic acid is treated in refined PPG is treated, described in addition
Magnesium or alumina silicate or its mixture, 95-115 DEG C are warming up under nitrogen atmosphere, keeping temperature is constant and stirs；
（2）60-90 DEG C is cooled to, PPG quality 5-10 % to be refined water described in addition, keeping temperature is constant and stirs
Mix；
（3）By step（2）Resulting material filters after processing, takes filtrate to be dehydrated, the PPG after being refined.
2. the process for purification of VOC content and smell in PPG is reduced according to claim 1, it is characterised in that treat essence
The PPG of system is obtained after polymerisation occurs under the catalysis of alkali metal by polyalcohol and oxyalkylene.
3. the process for purification of VOC content and smell in reduction PPG according to claim 1 or claim 2, it is characterised in that
The oxyalkylene is expoxy propane, oxirane or both mixture；The degree of functionality of the PPG is 1-8, number
Average molecular weight is 400-12000.
4. the process for purification of VOC content and smell in PPG is reduced according to claim 3, it is characterised in that step
（1）Middle keeping temperature is constant and the time of stirring is 0.5-2 hours.
5. the process for purification of VOC content and smell in PPG is reduced according to claim 4, it is characterised in that step
（2）Middle keeping temperature is constant and the time of stirring is 1-2 hours.
6. VOC content and the method for smell in PPG are reduced according to claim 5, it is characterised in that gather after filtering
Potassium, sodium ion total content are less than 5 ppm in ethoxylated polyhydric alcohol.
7. VOC content and the method for smell in PPG are reduced according to claim 6, it is characterised in that during dehydration
Temperature is 105-125 DEG C, and vacuum during dehydration is less than -0.09 Mpa.
8. VOC content and the method for smell in PPG are reduced according to claim 7, it is characterised in that after dehydration
Moisture is less than or equal to 0.1% in PPG, and pH is 5~7.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108484896A (en) * | 2018-04-13 | 2018-09-04 | 航锦科技股份有限公司 | A kind of preparation method of low VOC high-activity high molecular weight polyether polyols |
| CN109438663A (en) * | 2018-09-25 | 2019-03-08 | 青岛世林新海绵有限公司 | The low fogging sponge of low VOC for automobile interiors and its preparation process |
| CN114763410A (en) * | 2021-01-14 | 2022-07-19 | 长华化学科技股份有限公司 | Refining method of polyethylene glycol |
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