CN108864396A - A kind of refrigerator hard polyurethane foam foaming formulation and preparation method thereof - Google Patents
A kind of refrigerator hard polyurethane foam foaming formulation and preparation method thereof Download PDFInfo
- Publication number
- CN108864396A CN108864396A CN201810818213.3A CN201810818213A CN108864396A CN 108864396 A CN108864396 A CN 108864396A CN 201810818213 A CN201810818213 A CN 201810818213A CN 108864396 A CN108864396 A CN 108864396A
- Authority
- CN
- China
- Prior art keywords
- polyether polyol
- polyether
- refrigerator
- foaming
- pure white
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
- C08J9/141—Hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/08—Polyurethanes from polyethers
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention discloses a kind of refrigerator hard polyurethane foam foaming formulations, are related to polyurethane material technical field.Foaming formulation of the present invention is made after being mixed by combined polyether with polymeric MDI, and the mass ratio of combined polyether and polymeric MDI is 1:1.1-1.4；It include pure white material and physical blowing agent in combined polyether；Pure white material is by each material composition of following mass fraction：Hydroxyl value is 250-500mgKOH/g polyether polyol A25%-55%；Hydroxyl value is 300-500mgKOH/g polyether polyol B15%-60%；Hydroxyl value is 250-500mgKOH/g polyether polyol C10%-30%；Catalyst TMR-22-4%；Surfactant organosilicon 2-3%.The present invention by formula in each component it is reasonably combined, improve the mobility of foaming raw material, make its filling uniformly, improve refrigerator integral heat insulation performance.
Description
Technical field
The invention belongs to polyurethane material technical fields, more particularly to a kind of refrigerator hard polyurethane foam foaming formulation and one
Kind refrigerator hard polyurethane foam foaming formulation preparation method.
Background technique
As refrigerator technology continues to develop, refrigerator volume is increasing, and wall thickness is more and more thinner, and refrigerator harness is more narrow
Narrow space seems more crowded.During refrigerator foaming, the runner of urethane raw is narrow and flow passage resistance force of waterproof increases, and causes to gather
Urethane raw material flows in refrigerator to be not enough, so that polyurethane foam distribution is not uniform enough, occurs filling bad phenomenon day
Benefit increases, and influences refrigerator integral heat insulation performance.Therefore a hard polyurethane foam foaming formulation gesture for being suitble to its product is developed must
Row.
Summary of the invention
It is a kind of for the biggish refrigerator hard polyurethane foam of runner narrowed flow path resistance the purpose of the present invention is to provide providing
Foaming formulation, it is intended to which the mobility for improving foaming raw material makes its filling uniformly, improves refrigerator integral heat insulation performance.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions：
The present invention is a kind of refrigerator hard polyurethane foam foaming formulation, is made after being mixed by combined polyether with polymeric MDI, described
The mass ratio of combined polyether and polymeric MDI is 1:1.1-1.4；It include pure white material and physical blowing agent in the combined polyether；
Wherein, the pure white material is by each material composition of following mass fraction：
The polyether polyol A is the polyether polyol using sorbierite as initiator；
The polyether polyol B is using sucrose and/or mannitol as the polyether polyol of initiator；
The polyether polyol C is with one of triethanolamine, ethylenediamine, formaldehyde, diethanol, phenol or toluenediamine
Or a variety of amino-polyether polyalcohols for reacting to obtain product as initiator through graceful formula.
It further, in parts by weight include following component：
100 parts of pure white material；
12-15 parts of foaming agent pentamethylene；
123-161 parts of polymeric MDI.
A kind of preparation method of refrigerator hard polyurethane foam foaming formulation, includes the following steps：
Step 1 is weighed by formula polyether polyol A, polyether polyol B, polyether polyol C, catalyst and surface-active
Agent is simultaneously compounded into pure white material through physics；
Step 2, under the conditions of 15-25 DEG C of temperature of charge, pure white material, physical blowing agent pentamethylene are mixed according to the ratio, obtained
To combined polyether；
Step 3, under the conditions of 15-25 DEG C of temperature of charge, combined polyether and polymeric MDI are passed through into high pressure foaming machine according to the ratio
After mixing, it is rapidly injected in refrigerator body to be foamed；
Step 4, by the control of the refrigerator body mold temperature of foaming at 40-55 DEG C, foaming raw material fill factor α in a mold
Heat preservation hard polyurethane foams are formed that is, in refrigerator body by 180s-400s curing and demolding for 1.4-1.6.
The invention has the advantages that：
1, the present invention uses TMR-2 catalyst, and the catalyst effect is more gentle and stablizes, and makes anti-in foaming process
Answer rate relatively stable, urethane raw flowing is more gentle, improves raw material by the way that runner is narrow and resistance larger structure
Ability makes foam distribution uniform.
2, the present invention uses TMR-2 catalyst, and material flow is more gentle, also reduces the bad phenomenon of blibbing, compared with
It is good to avoid sucking a large amount of bubbles, influence foam integral heat insulation performance.
3, the present invention uses the higher pentamethylene physical blowing agent of boiling point, compared to low boiling points such as 245fa, LBA, 134a
Foaming agent can make foamable reaction more gentle, and reduce urethane raw causes material viscosity disconnected because foaming agent gasifies rapidly
Precipice formula reduces, and avoids raw material from sucking a large amount of bubbles because of too fast flowing, to influence foam integral heat insulation performance.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Specific embodiment
Embodiment 1
Each raw material of the present embodiment polyurethane foam system is by the composition of mass parts：
100 parts of pure white material；
13 parts of foaming agent pentamethylene；
136 parts of polymeric MDI.
Wherein each composition quality score of pure white material is：
The polyether polyol A is the polyether polyol using sorbierite as initiator；
The polyether polyol B is using sucrose and mannitol as the polyether polyol of initiator；
The polyether polyol C is to react to obtain product as initiator through graceful formula using formaldehyde, diethanol and three kinds of phenol
Amino-polyether polyalcohol.
Preparation method includes the following steps：
Step 1 is weighed by formula polyether polyol A, polyether polyol B, polyether polyol C, catalyst and surface-active
Agent is simultaneously compounded into pure white material through physics；
Step 2, under the conditions of 20 DEG C of temperature of charge, pure white material, physical blowing agent pentamethylene are mixed according to the ratio, obtain group
Close polyethers；
Step 3, under the conditions of 20 DEG C of temperature of charge, combined polyether and polymeric MDI are mixed by high pressure foaming machine according to the ratio
After conjunction, it is rapidly injected in refrigerator body to be foamed；
Step 4 controls the refrigerator body mold temperature of foaming at 45 DEG C, and fill factor α is foaming raw material in a mold
1.5, by 300s curing and demolding, i.e., heat preservation hard polyurethane foams are formed in refrigerator body.
After cabinet to be foamed is cooled to room temperature, the hard polyurethane foams in cabinet are taken out, and test its correlated performance,
It the results are shown in Table 1.
Embodiment 2
Each raw material of the present embodiment polyurethane foam system is by the composition of mass parts：
100 parts of pure white material；
13 parts of foaming agent pentamethylene；
136 parts of polymeric MDI.
Wherein each composition quality score of pure white material is：
The polyether polyol A is the polyether polyol using sorbierite as initiator；
The polyether polyol B is using sucrose and mannitol as the polyether polyol of initiator；
The polyether polyol C is to react to obtain product as initiator through graceful formula using formaldehyde, diethanol and three kinds of phenol
Amino-polyether polyalcohol.
Using the polyurethane foam system of the present embodiment, the method for keeping the temperature hard polyurethane foams in refrigerator body is manufactured
It is same as Example 1.
After cabinet to be foamed is cooled to room temperature, the hard polyurethane foams in cabinet are taken out, and test its correlated performance,
It the results are shown in Table 1.
Embodiment 3
Each raw material of the present embodiment polyurethane foam system is by the composition of mass parts：
100 parts of pure white material；
13 parts of foaming agent pentamethylene；
136 parts of polymeric MDI.
Wherein each composition quality score of pure white material is：
The polyether polyol A is the polyether polyol using sorbierite as initiator；
The polyether polyol B is using sucrose and mannitol as the polyether polyol of initiator；
The polyether polyol C is to react to obtain product as initiator through graceful formula using formaldehyde, diethanol and three kinds of phenol
Amino-polyether polyalcohol.
Using the polyurethane foam system of the present embodiment, the method for keeping the temperature hard polyurethane foams in refrigerator body is manufactured
It is same as Example 1.
After cabinet to be foamed is cooled to room temperature, the hard polyurethane foams in cabinet are taken out, and test its correlated performance,
It the results are shown in Table 1.
Table 1 is hard polyurethane foams the performance test results made from embodiment 1-3：
As can be seen from the above table, the average core density of embodiment 1,2 very poor (difference of maxima and minima) is compared to reality
It applies example 3 to have clear improvement, while curing time and mean coefficient of heat conductivity are almost the same with embodiment 3, it is poly- to have no effect on other
Other performances of urethane foam, therefore hard polyurethane foam foaming formulation of the present invention, can effectively solve refrigerator runner it is narrow and stream
The larger problem of road resistance.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one implementation of the invention
In example or example.In the present specification, schematic expression of the above terms may not refer to the same embodiment or example.
Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples to close
Suitable mode combines.Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.Preferred embodiment is not
There is the details that detailed descriptionthe is all, does not limit the invention to the specific embodiments described.Obviously, according to this specification
Content can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to preferably explain this
The principle and practical application of invention, so that skilled artisan be enable to better understand and utilize the present invention.This hair
It is bright to be limited only by the claims and their full scope and equivalents.
Claims (3)
1. a kind of refrigerator hard polyurethane foam foaming formulation is made after being mixed by combined polyether with polymeric MDI, it is characterised in that：Institute
The mass ratio for stating combined polyether and polymeric MDI is 1:1.1-1.4；It include pure white material and physical blowing agent in the combined polyether；
Wherein, the pure white material is by each material composition of following mass fraction：
The polyether polyol A is the polyether polyol using sorbierite as initiator；
The polyether polyol B is using sucrose and/or mannitol as the polyether polyol of initiator；
The polyether polyol C is with one of triethanolamine, ethylenediamine, formaldehyde, diethanol, phenol or toluenediamine or more
Kind reacts to obtain the amino-polyether polyalcohol that product is initiator through graceful formula.
2. a kind of refrigerator hard polyurethane foam foaming formulation according to claim 1, which is characterized in that include in parts by weight
Following component：
100 parts of pure white material；
12-15 parts of foaming agent pentamethylene；
123-161 parts of polymeric MDI.
3. a kind of preparation method of refrigerator hard polyurethane foam foaming formulation as claimed in claim 1 or 2, which is characterized in that packet
Include following steps：
Step 1 is weighed by formula polyether polyol A, polyether polyol B, polyether polyol C, catalyst and surfactant simultaneously
Pure white material is compounded into through physics；
Step 2, under the conditions of 15-25 DEG C of temperature of charge, pure white material, physical blowing agent pentamethylene are mixed according to the ratio, obtain group
Close polyethers；
Step 3, under the conditions of 15-25 DEG C of temperature of charge, combined polyether is mixed with polymeric MDI by high pressure foaming machine according to the ratio
Afterwards, it is rapidly injected in refrigerator body to be foamed；
Step 4 controls the refrigerator body mold temperature of foaming at 40-55 DEG C, and fill factor α is foaming raw material in a mold
1.4-1.6 forms heat preservation hard polyurethane foams by 180s-400s curing and demolding that is, in refrigerator body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810818213.3A CN108864396A (en) | 2018-07-24 | 2018-07-24 | A kind of refrigerator hard polyurethane foam foaming formulation and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810818213.3A CN108864396A (en) | 2018-07-24 | 2018-07-24 | A kind of refrigerator hard polyurethane foam foaming formulation and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108864396A true CN108864396A (en) | 2018-11-23 |
Family
ID=64304447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810818213.3A Pending CN108864396A (en) | 2018-07-24 | 2018-07-24 | A kind of refrigerator hard polyurethane foam foaming formulation and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108864396A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113817213A (en) * | 2021-09-10 | 2021-12-21 | 苏州思德新材料科技有限公司 | Preparation method of polyurethane rigid foam |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02250884A (en) * | 1989-03-24 | 1990-10-08 | Lion Akzo Kk | Urethane foam, production thereof and production of alkoxylate quaternary ammonium boric ester salt |
| US5260344A (en) * | 1992-03-13 | 1993-11-09 | Asahi Glass Company, Ltd. | Open cell rigid isocyanurate foams and method for producing the same and vacuum heat insulating layer by use of the same |
| EP1967535B1 (en) * | 2007-03-05 | 2009-11-18 | Basf Se | Compact polyisocyanurates with improved processing and product characteristics and method for production of same |
| CN101652400A (en) * | 2007-01-30 | 2010-02-17 | 陶氏环球技术公司 | Amine-initiated polyols and rigid polyurethane foam made therefrom |
| CN102666627A (en) * | 2009-09-29 | 2012-09-12 | 陶氏环球技术有限责任公司 | Polyol mixtures containing a 1,3-and/or 1,4-bis(aminomethyl) cyclohexane-initiated polyol and at least one of a methylene bis (cyclohexylamine)-initiated polyol and a cyclohexanediamine-initiated polyol, and polyurethanes made therefrom |
| CN104327232A (en) * | 2014-11-27 | 2015-02-04 | 合肥华凌股份有限公司 | Polyurethane foaming white material and polyurethane composition |
| CN104497552A (en) * | 2014-12-11 | 2015-04-08 | 泉州泉港华博化工科技有限公司 | Waterborne polyurethane high-resilience plastic foam for automobile seats and preparation process thereof |
| JP2015168794A (en) * | 2014-03-10 | 2015-09-28 | 東ソー株式会社 | Rigid urethane foam, and method for producing the same |
| CN105085865A (en) * | 2015-08-06 | 2015-11-25 | 山东一诺威新材料有限公司 | Special high-activity environment-friendly polyurethane thermal insulation material for refrigerator and preparation method of special high-activity environment-friendly polyurethane thermal insulation material |
| CN106750093A (en) * | 2016-11-30 | 2017-05-31 | 合肥美菱股份有限公司 | A kind of refrigerator for the polyurethane foam system of refrigerator and based on it |
| CN108059709A (en) * | 2018-01-16 | 2018-05-22 | 江苏长顺高分子材料研究院有限公司 | Low VOC polyurethane foams and preparation method thereof |
-
2018
- 2018-07-24 CN CN201810818213.3A patent/CN108864396A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02250884A (en) * | 1989-03-24 | 1990-10-08 | Lion Akzo Kk | Urethane foam, production thereof and production of alkoxylate quaternary ammonium boric ester salt |
| US5260344A (en) * | 1992-03-13 | 1993-11-09 | Asahi Glass Company, Ltd. | Open cell rigid isocyanurate foams and method for producing the same and vacuum heat insulating layer by use of the same |
| CN101652400A (en) * | 2007-01-30 | 2010-02-17 | 陶氏环球技术公司 | Amine-initiated polyols and rigid polyurethane foam made therefrom |
| EP1967535B1 (en) * | 2007-03-05 | 2009-11-18 | Basf Se | Compact polyisocyanurates with improved processing and product characteristics and method for production of same |
| CN102666627A (en) * | 2009-09-29 | 2012-09-12 | 陶氏环球技术有限责任公司 | Polyol mixtures containing a 1,3-and/or 1,4-bis(aminomethyl) cyclohexane-initiated polyol and at least one of a methylene bis (cyclohexylamine)-initiated polyol and a cyclohexanediamine-initiated polyol, and polyurethanes made therefrom |
| JP2015168794A (en) * | 2014-03-10 | 2015-09-28 | 東ソー株式会社 | Rigid urethane foam, and method for producing the same |
| CN104327232A (en) * | 2014-11-27 | 2015-02-04 | 合肥华凌股份有限公司 | Polyurethane foaming white material and polyurethane composition |
| CN104497552A (en) * | 2014-12-11 | 2015-04-08 | 泉州泉港华博化工科技有限公司 | Waterborne polyurethane high-resilience plastic foam for automobile seats and preparation process thereof |
| CN105085865A (en) * | 2015-08-06 | 2015-11-25 | 山东一诺威新材料有限公司 | Special high-activity environment-friendly polyurethane thermal insulation material for refrigerator and preparation method of special high-activity environment-friendly polyurethane thermal insulation material |
| CN106750093A (en) * | 2016-11-30 | 2017-05-31 | 合肥美菱股份有限公司 | A kind of refrigerator for the polyurethane foam system of refrigerator and based on it |
| CN108059709A (en) * | 2018-01-16 | 2018-05-22 | 江苏长顺高分子材料研究院有限公司 | Low VOC polyurethane foams and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| XU QIANWEI ET AL.: "The effect of the trimerization catalyst on the thermal stability and the fire performance of the polyisocyanurate-polyurethane foam", 《FIRE AND MATERIALS》 * |
| 孟楠等: "季铵盐催化剂", 《聚氨酯工业》 * |
| 李建平等: "PIR-PU泡沫中三聚催化剂催化能力的研究 ", 《塑料助剂》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113817213A (en) * | 2021-09-10 | 2021-12-21 | 苏州思德新材料科技有限公司 | Preparation method of polyurethane rigid foam |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108976463B (en) | Composition set for preparing polyurethane foam, preparation method and application thereof | |
| EP3475351B1 (en) | Composition suitable for preparing polyurethane or polyisocyanurate rigid foams | |
| CN102432907B (en) | Preparation method of low-temperature-resistant cold-resistant polyurethane bicomponent sole raw material | |
| KR20170132306A (en) | Polyether-polysiloxane block copolymer compositions, surfactants containing them, foam stabilizers, compositions for forming polyurethane foams, cosmetics and their preparation | |
| CN111320737B (en) | Polyurethane raw material composition, preparation method and application of polyurethane rigid foam | |
| CN106750093A (en) | A kind of refrigerator for the polyurethane foam system of refrigerator and based on it | |
| CN108610621A (en) | A kind of high acoustic absorption low-density polyurethane semi-rigid foam and preparation method thereof | |
| CN107814897A (en) | Polyurethane foam combination, polyurethane foam, the method and refrigeration plant for preparing polyurethane foam | |
| CN110105520A (en) | A kind of heat preservation hard polyurethane foams and preparation method thereof | |
| JP7482961B2 (en) | Use of Z-HFO-1,1,1,4,4,4-hexafluoro-2-butene in high temperature foaming applications | |
| CN111269375B (en) | Low-temperature-sensitive flatulence molding slow-resilience sponge and preparation method thereof | |
| CN108250404A (en) | Polyurethane rigid foam plastic and preparation method thereof | |
| CN107459626A (en) | Refrigerator polyurethane composition polyethers and its hard polyurethane foam | |
| AU728709B2 (en) | Integral skin foams | |
| CN108864396A (en) | A kind of refrigerator hard polyurethane foam foaming formulation and preparation method thereof | |
| CN112724448B (en) | Low-density and low-temperature-resistant polyurethane foam and preparation method thereof | |
| JP3700499B2 (en) | refrigerator | |
| CN110396213A (en) | A kind of refrigerator polyurethane insulation coating and preparation method thereof | |
| KR100771910B1 (en) | Rigid polyurethane foam having a good demolding property | |
| CN115594878B (en) | Foaming method of polyurethane foam | |
| JP2004269890A (en) | Raw composition for producing polyurethane foam improved in demolding property and adhesion, polyurethane foam produced by the composition, and its production method | |
| CN110028645A (en) | A kind of fast demoulding combined polyether and its polyurethane and preparation method | |
| CN113929852B (en) | Polyurethane composition, combined polyether, polyurethane hard foam and preparation method thereof | |
| JPS59108041A (en) | Preparation of polyurethane foam | |
| CN106279616B (en) | A kind of super-elastic material and preparation method and application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181123 |