CN108281132A - With Cylindrical Pit bionic non-smooth surface polyurethane foam board and preparation method - Google Patents

With Cylindrical Pit bionic non-smooth surface polyurethane foam board and preparation method Download PDF

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Publication number
CN108281132A
CN108281132A CN201810203799.2A CN201810203799A CN108281132A CN 108281132 A CN108281132 A CN 108281132A CN 201810203799 A CN201810203799 A CN 201810203799A CN 108281132 A CN108281132 A CN 108281132A
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Prior art keywords
pit
polyurethane foam
smooth surface
cylindrical pit
cylindrical
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Inventor
陈书明
张继修
戢杨杰
张喆
谷飞鸿
王登峰
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Jilin University
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Jilin University
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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162Selection of materials
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30Low-molecular-weight compounds
    • C08G18/32Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3271Hydroxyamines
    • C08G18/3278Hydroxyamines containing at least three hydroxy groups
    • C08G18/3281Hydroxyamines containing at least three hydroxy groups containing three hydroxy groups
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40High-molecular-weight compounds
    • C08G18/48Polyethers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6666Compounds of group C08G18/48 or C08G18/52
    • C08G18/667Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6681Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
    • C08G18/6688Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3271

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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)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

The invention discloses a kind of bionic non-smooth surface polyurethane foam boards with Cylindrical Pit form, including:Substrate, and the upper surface of base plate is provided with Cylindrical Pit;The Cylindrical Pit is structure as a whole with the substrate, and material is polyurethane;The Cylindrical Pit is evenly distributed semicolumn pit and semiellipse column pit;The present invention provides a kind of bionic non-smooth surface polyurethane foam board and preparation method thereof with Cylindrical Pit form, enables polyurethane foam board in relatively thin thickness range, shows excellent sound absorbing performance, to achieve the purpose that sqouynd absorption lowering noise.

Description

With Cylindrical Pit bionic non-smooth surface polyurethane foam board and preparation method
Technical field
It is more particularly to a kind of bionical with Cylindrical Pit form the present invention relates to acoustical material technical field Non-smooth surface polyurethane foam board and preparation method thereof.
Background technology
Non-smooth surface bionic theory be biology by own existence to adapt to the organism surface Non-smooth surface that environment is shown Characteristic.Organism surface status and appearance is non-smooth surface of organism, and this characteristic that organism surface is shown is the visitor of nature It sees and exists.Non-smooth surface bionics techniques is to solve one kind of engineering problem using Biologic nonsmoothed morphosis in nature as prototype Scientific application technology.
With the development of auto industry, automobile vendor is increasingly stringenter the NVH performance requirements of automobile.Acoustics is packed good The bad size for directly influencing internal car noise, therefore excellent acoustics packaging has active influence for the noise reduction of automobile.Mesh The preceding research for acoustics packaging only stops at the research of smooth surface, the research for non-smooth surface acoustics packaging character There are blank, therefore combine bionics that non-smooth surface is applied in acoustics packaging and carry out novel high-performance sound-absorbing material not only With important learning value, and there is boundless application prospect.Currently about the special of bionic non-smooth surface noise reduction Profit has, and patent announcement number discloses a kind of excessive based on the drop for coupling bionic principle for the patent of invention of " CN103982705A " Valve is flowed, when hydraulic oil flows through spool, valve body, non-smooth surface can reduce flow resistance for the invention, reduce frictional noise, fit The noise abatement of hydraulic control component for various structure of relief valve forms, principle is novel, simple in structure, and noise reduction is aobvious It writes;
But the research to non-smooth surface noise reduction is only resided in this field, for the research of sound absorption, there are vacancies;
Therefore, how to combine bionics that non-smooth surface is applied in car acpistocs packaging, provide a kind of with cylindricality Bionic non-smooth surface polyurethane foam board of concave state and preparation method thereof is asking for those skilled in the art's urgent need to resolve Topic.
Invention content
In view of this, the present invention provides a kind of bionic non-smooth surface polyurethane foam boards with Cylindrical Pit form And preparation method thereof, excellent sound absorbing performance can be shown in relatively thin thickness range, to reach the mesh of sqouynd absorption lowering noise 's.
To achieve the goals above, the present invention uses following technical scheme:
A kind of bionic non-smooth surface polyurethane foam board with Cylindrical Pit form, including:Substrate, and the substrate Upper surface is provided with Cylindrical Pit;The Cylindrical Pit is structure as a whole with the substrate, and material is polyurethane;The cylindricality Pit is evenly distributed semicolumn pit and semiellipse column pit.
Through the above technical solutions, the technique effect of the present invention:Bionic non-smooth surface with Cylindrical Pit form is poly- Urethane cystosepiment is divided into substrate and Cylindrical Pit two parts, so that intermediate frequency and high frequency sound absorbing performance is significantly improved, greatly improves sound absorption Coefficient, while the thickness of sound-absorbing material plate can be adjusted in relatively thin range according to actual conditions.
Preferably, a kind of in the bionic non-smooth surface polyurethane foam board of Cylindrical Pit form, the semicircle The section of column pit is semicircle, and semicircle a diameter of 4mm, and the adjacent semicolumn pit distance is 4mm.
Preferably, a kind of in the bionic non-smooth surface polyurethane foam board of Cylindrical Pit form, described half is ellipse The section of cylinder pit be half elliptic, and half elliptic major semiaxis be 4mm, short axle 4mm, the semiellipse column pit away from From for 4mm.
Through the above technical solutions, the technique effect of the present invention:By section be the semicircular semicolumn pit and Section is the bionic, non-smooth with Cylindrical Pit form for the different shape that the semiellipse column pit of half elliptic is constituted The structure of surface polyurethane foam board can increase the contact area of incidence wave and material, and more sound wave incidents can be made to arrive In acoustic material, and then increase the absorptivity of sound wave, improves sound absorbing performance.
Preferably, a kind of in the bionic non-smooth surface polyurethane foam board of Cylindrical Pit form, the substrate It is 30mm with Cylindrical Pit two parts overall thickness.
Preferably, a kind of in the bionic non-smooth surface polyurethane foam board of Cylindrical Pit form, the substrate With hole.
Through the above technical solutions, the technique effect of the present invention:When sound wave incident is to material surface, a part of acoustic energy hair Raw reflection, another part enter material internal by hole, and air occurs relative motion with material internal hole and generates friction, sound The raising of air vibration velocity can accelerate kinetic energy to be converted to frictional heat energy and then improve polyurethane when wave passes through non-smooth surface The sound absorbing performance of cystosepiment.
Preferably, described to have a kind of in the bionic non-smooth surface polyurethane foam board of Cylindrical Pit form The bionic non-smooth surface polyurethane foam board of Cylindrical Pit form is packed by bonding method and object to be packaged.
Preferably, a kind of in the bionic non-smooth surface polyurethane foam board of Cylindrical Pit form, the poly- ammonia Ester is by polyether polyol 330N, polyalcohol 3630, catalyst A33, triethanolamine, catalyst A1, silicone oil, deionized water and MDI Composition;Its mass fraction ratio 55-63:35-43:0.9-1.1:0.9-1.1:0.1-0.12:1.8-2.0:4.5-5.0:30-35.
A kind of preparation method of the bionic non-smooth surface polyurethane foam board with Cylindrical Pit form:
Polyether polyol 330N, polyalcohol 3630, catalyst A33, triethanolamine, catalysis are weighed first, in accordance with material mixture ratio Agent A1, silicone oil and deionized water, are inverted in dixie cup, and composite blender is carried out with the mixing speed of 2000r/min Stir 90s;Next weighs corresponding MDI and is poured into dixie cup, is stirred with 500r/min using material mixers, waits for paper Cup adstante febre pours into it in mold rapidly, and mold is sealed;Mold is finally put into drying box, drying box temperature setting is 50 DEG C, after incubator is stored 2 hours, take out sample.
Preferably, in a kind of bionic non-smooth surface polyurethane foam board preparation method with Cylindrical Pit form, The mold is cylinder can, and the cylinder can box cover selects the mode of 3D printing according to substrate surface Cylindrical Pit shape It is prepared, printed material selects ABS resin to prepare.
It can be seen via above technical scheme that compared with prior art, the present disclosure provides one kind to have cylindricality recessed The bionic non-smooth surface polyurethane foam board and preparation method thereof for cheating form, the bionic, non-smooth table with Cylindrical Pit form Face polyurethane foam board is divided into substrate and Cylindrical Pit two parts, so that intermediate frequency and high frequency sound absorbing performance is significantly improved, greatly improves Acoustic absorptivity, while the thickness of sound-absorbing material plate can be adjusted in relatively thin range according to actual conditions;
The semiellipse column pit structure that by section be the semicircular semicolumn pit and section is half elliptic At different shape the bionic non-smooth surface polyurethane foam board with Cylindrical Pit form structure, incidence can be increased The contact area of wave and material can make in more sound wave incidents to acoustic material, and then increase the absorptivity of sound wave, improve Sound absorbing performance;When sound wave incident is to material surface, a part of acoustic energy reflects, and another part is entered by hole in material Portion, air occur relative motion with material internal hole and generate friction, air vibration velocity when sound wave passes through non-smooth surface Improving can accelerate kinetic energy to be converted to frictional heat energy and then improve the sound absorbing performance of polyurethane foam board;
A kind of bionic non-smooth surface polyurethane foam board and its preparation with Cylindrical Pit form provided by the invention Method enables polyurethane foam board in relatively thin thickness range, shows excellent sound absorbing performance, to reach sound absorption drop The purpose made an uproar.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis The attached drawing of offer obtains other attached drawings.
Fig. 1 attached drawings are the axonometric drawing of present invention setting semicolumn pit substrate;
Fig. 2 attached drawings are the full sectional view of present invention setting semicolumn pit substrate front view;
Fig. 3 attached drawings are the axonometric drawing of present invention setting semiellipse column pit substrate;
Fig. 4 attached drawings are the full sectional view of present invention setting semiellipse column pit substrate front view;
Fig. 5 attached drawings are different bionic non-smooth surface polyurethane foam board sound absorbing performance correlation curves.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a kind of bionic non-smooth surface polyurethane foam board with Cylindrical Pit form and Preparation method can show excellent sound absorbing performance, to reach the mesh of sqouynd absorption lowering noise in relatively thin thickness range 's.
In conjunction with attached drawing 1-4, the invention discloses a kind of bionic non-smooth surface polyurethane foams with Cylindrical Pit form Foam plate, including:Substrate 1, and 1 upper surface of substrate is provided with Cylindrical Pit 2;Cylindrical Pit 2 is structure as a whole with substrate 1, and material Matter is polyurethane;Cylindrical Pit 2 is evenly distributed semicolumn pit 11 and semiellipse column pit 12.
In order to advanced optimize above-mentioned technical proposal, the section of semicolumn pit 11 is semicircle, and semicircle a diameter of 4mm, adjacent semicolumn pit 11 is apart from for 4mmm.
In order to advanced optimize above-mentioned technical proposal, the section of semiellipse column pit 12 is half elliptic, and half elliptic Major semiaxis is 4mm, and the distance of short axle 4mm, semiellipse column pit 12 are 4mm.
In order to advanced optimize above-mentioned technical proposal, substrate 1 and 2 overall thickness of Cylindrical Pit are 30mm.
In order to advanced optimize above-mentioned technical proposal, substrate 1 has hole.
In order to advanced optimize above-mentioned technical proposal, the bionic non-smooth surface polyurethane foam with Cylindrical Pit form Plate is packed by bonding method and object to be packaged.
Polyurethane is by polyalcohol 330N, polyalcohol 3630, catalyst A33, triethanolamine, catalyst A1, silicone oil, deionization Water and MDI compositions;Its mass fraction is than 60:40:1:1:0.12:1.8:4.8:30.
A kind of preparation method of the bionic non-smooth surface polyurethane foam board with Cylindrical Pit form:
Polyether polyol 330N, polyalcohol 3630, catalyst A33, triethanolamine, catalysis are weighed first, in accordance with material mixture ratio Agent A1, silicone oil and deionized water, are inverted in dixie cup, and composite blender is carried out with the mixing speed of 2000r/min Stir 90s;
Next weighs corresponding MDI and is poured into dixie cup, is stirred with 500r/min using material mixers, waits for paper Cup adstante febre pours into it in mold rapidly, and mold is sealed;
Mold is finally put into drying box, drying box temperature setting is 50 DEG C, after incubator is stored 2 hours, takes out sample Product.
In order to advanced optimize above-mentioned technical proposal, mold is cylinder can, and cylinder can box cover is according to substrate surface column Shape pit shape selects the mode of 3D printing to be prepared, and printed material selects ABS resin to prepare.
Embodiment 1
Manufacture and design the polyurethane foam board of the bionic, non-smooth form with semicolumn pit.
Referring to Figures 1 and 2, the non-smooth surface form of polyurethane foam board is located on matrix surface in evenly distributed Semicolumn pit 11 formed, the section of semicolumn pit 11 is semicircle, and semicircle diameter d is 4mm, adjacent semicolumn 11 distance L of pit is 4mm.Matrix 1 is urethane raw, and integral material thickness is 30mm, and manufacture and design out has half The polyurethane foam of cylinder pit is compared with the smooth surface polyurethane foam of same basis material, intermediate frequency and high frequency sound absorbing performance It significantly improves, and quality reduces by 4.4%.
Embodiment 2
Manufacture and design the polyurethane foam board of the bionic, non-smooth form with semiellipse column pit.
With reference to Fig. 3 and Fig. 4, the non-smooth surface form of polyurethane foam board is located on matrix surface in evenly distributed Semiellipse column pit 12 formed, the section of semiellipse column pit 12 is half elliptic, and major semiaxis b is 4mm, short axle a is The distance L of 4mm, adjacent semiellipse column pit 12 are 4mm.Matrix 1 is urethane raw, and integral material thickness is 30mm, if Count the smooth surface polyurethane foam phase of the polyurethane foam and same basis material with semiellipse column pit manufactured Than intermediate frequency and high frequency sound absorbing performance significantly improve, and quality reduces by 5.3%.
To sum up embodiment can be seen that the good effect that the present invention is obtained by following sound absorbing performance correlation curve.
With reference to Fig. 5, Fig. 5 is the polyurethane foam board sound absorbing performance correlation curve with cylinder concave state, in 20- In 1500Hz frequency ranges, the acoustic absorptivity of various polyurethane foam boards increases with the increase of frequency, and different tables Sound-absorbing material acoustic absorptivity difference in this frequency range in face is little, wherein smooth surface reaches peak value, surface in 1250Hz Acoustic absorptivity for semicolumn pit and the polyurethane foam board of semiellipse column concave state is reached in 1500Hz and 1550Hz respectively To maximum value;Within the scope of 1500-3000Hz, each surface acoustic absorptivity is reduced with the increase of frequency, wherein smooth table Face is relatively low, and the polyurethane foam board of semiellipse column concave state is relatively preferable;Within the scope of 3000-6000Hz, sound-absorbing material Acoustic absorptivity reduces afterwards as frequency increase first increases, wherein the polyurethane foam board sound absorbing performance phase of semiellipse column concave state To best, reach 0.972 in 5500Hz.
In conclusion compared with smooth flat, the polyurethane foam board with column concave state is in low frequency and middle low frequency model Enclose influences less in (20-1500Hz), and in medium-high frequency and high-frequency range (1500-6000Hz), sound absorption energy-absorbing has larger It improves, and the polyurethane foam board sound absorbing performance of semiellipse column concave state is best.
It is the number for reducing experiment as far as possible in view of actual conditions, the horizontal orthogonal arrage of four factor of this experimental selection three, As shown in table 1.
Table 1
Numerical value in table 2 is the level and average sound absorption coefficient corresponding to each factor.
Table 2
Table 3 is each factor signal-to-noise ratio data, and signal-to-noise ratio is bigger, and the influence for illustrating the factor to acoustic absorptivity is bigger, according to table Lattice can learn A2B1C2D2 combination sound absorbing performance it is best, deionized water, triethanolamine, silicone oil and catalyst A33 number Respectively 4.8,1,1.8 and 1.
Table 3
Symbol Factor Level 1 Level 2 Level 3
A Deionized water -5.94 -5.87 -5.92
B Triethanolamine -5.84 -5.88 -5.91
C Silicone oil -5.90 -5.86 -5.88
D A33 -5.95 -5.92 -5.94
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is said referring to method part It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest range caused.

Claims (9)

1. a kind of bionic non-smooth surface polyurethane foam board with Cylindrical Pit form, which is characterized in that including:Substrate (1), and the substrate (1) upper surface is provided with Cylindrical Pit (2);The Cylindrical Pit (2) is integrated knot with the substrate (1) Structure, and material is polyurethane;The Cylindrical Pit (2) is evenly distributed semicolumn pit (11) and semiellipse column pit (12)。
2. a kind of bionic non-smooth surface polyurethane foam board with Cylindrical Pit form according to claim 1, It is characterized in that, the section of the semicolumn pit (11) is semicircle, and semicircle a diameter of 4mm, the adjacent semicolumn are recessed It is 4mm to cheat (11) distance.
3. a kind of bionic non-smooth surface polyurethane foam board with Cylindrical Pit form according to claim 2, It is characterized in that, the section of the semiellipse column pit (12) is half elliptic, and half elliptic major semiaxis is 4mm, and short axle is The distance of 4mm, the adjacent semiellipse column pit (12) are 4mm.
4. a kind of bionic non-smooth surface polyurethane foam board with Cylindrical Pit form according to claim 3, It is characterized in that, the substrate (1) and the Cylindrical Pit (2) overall thickness are 30mm.
5. according to a kind of bionic non-smooth surface polyurethane foam with Cylindrical Pit form of claim 1-4 any one of them Foam plate, which is characterized in that the substrate (1) has hole.
6. according to a kind of bionic non-smooth surface polyurethane foam with Cylindrical Pit form of claim 1-5 any one of them Foam plate, which is characterized in that the bionic non-smooth surface polyurethane foam board with Cylindrical Pit form passes through bonding method It is packed with object to be packaged.
7. according to a kind of bionic non-smooth surface polyurethane foam with Cylindrical Pit form of claim 1-5 any one of them Foam plate, which is characterized in that the polyurethane is by polyether polyol 330N, polyalcohol 3630, catalyst A33, triethanolamine, catalysis Agent A1, silicone oil, deionized water and MDI compositions;Its mass fraction ratio 55-63:35-43:0.9-1.1:0.9-1.1:0.1-0.12: 1.8-2.0:4.5-5.0:30-35.
8. a kind of preparation method of the bionic non-smooth surface polyurethane foam board with Cylindrical Pit form, which is characterized in that Specific steps include:
Polyether polyol 330N, polyalcohol 3630, catalyst A33, triethanolamine, catalyst are weighed first, in accordance with material mixture ratio A1, silicone oil and deionized water, are inverted in dixie cup, and composite blender is stirred with the mixing speed of 2000r/min Mix 90s;
Next weighs corresponding MDI and is poured into dixie cup, is stirred with 500r/min using material mixers, waits for that dixie cup is sent out It is poured into mold rapidly when hot, and mold is sealed;
Mold is finally put into drying box, drying box temperature setting is 50 DEG C, after incubator is stored 2 hours, takes out sample.
9. a kind of system of bionic non-smooth surface polyurethane foam board with Cylindrical Pit form according to claim 8 Preparation Method, which is characterized in that the mold is cylinder can, and the cylinder can box cover is according to substrate surface Cylindrical Pit shape Shape selects the mode of 3D printing to prepare, and printed material selects ABS resin to prepare.
CN201810203799.2A 2018-03-13 2018-03-13 With Cylindrical Pit bionic non-smooth surface polyurethane foam board and preparation method Pending CN108281132A (en)

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Application publication date: 20180713