CN110041496A - A kind of tung oil base composite polyurethane sound-absorbing material and preparation method thereof containing southern reed particle - Google Patents
A kind of tung oil base composite polyurethane sound-absorbing material and preparation method thereof containing southern reed particle Download PDFInfo
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/6696—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
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Abstract
The preparation method of the invention discloses a kind of tung oil base composite polyurethane sound-absorbing material containing southern reed particle, include the following steps: Step 1: eleostearic acid polyalcohol, polyether polyol, foaming agent, chain extender, catalyst, foam stabiliser are sequentially added in dixie cup, substance in dixie cup is stirred, the first mixture is obtained, is stood；Step 2: pretreated southern reed particle is added in first mixture, the second mixture is obtained after stirring, is stood；Step 3: isocyanates is added in second mixture, third mixture is obtained after stirring；Step 4: the third mixture is poured into mold, and pave, foams in a mold；Step 5: foamed is taken out, after solidification, surface skining is removed, obtains the tung oil base composite polyurethane sound-absorbing material containing southern reed particle.The present invention also provides a kind of tung oil base composite polyurethane sound-absorbing material containing southern reed particle.
Description
Technical field
The invention belongs to acoustics field of packaging material, in particular to a kind of tung oil base containing southern reed particle is compound poly-
Urethane sound-absorbing material and preparation method thereof.
Background technique
With the continuous development of society with progress, total vehicle is being continuously increased, requirement of the people to car comfort
It is higher and higher.Automobile noise can be effectively reduced using the acoustics packaging of automobile, promote the comfort of automobile.Polyurethane sound absorption material
Material is easy to process because its sound absorbing performance is good, is used in car acpistocs packaging will, it can be effectively reduced, and car is various to make an uproar
Sound is widely used.
The raw material of the polyurethane sound absorption material used on automobile at present is extracted from petroleum, the dirt to environment
Dye is big, and petroleum is a kind of non-renewable resource.Although there is traditional petroleum based polyurethanes relatively good high frequency to absorb sound
Effect, but the sound absorption effect of its low frequency is poor.And some other environmental-friendly type polyurethane made using vegetable oil for raw material
Mostly also just with its mechanical performance, and it is unable to satisfy the acoustical behavior demand as sound-absorbing material.Tung oil is that China is important
The raw material of industry, can eaily be obtained from tung oil tree.There is tung oil tree resource abundant in China within the border.
Chinese patent application, a kind of application number " 2018109734511 " patent name " eleostearic acid based polyurethanes sound-absorbing material
And preparation method thereof " a kind of polyurethane sound absorption material prepared using eleostearic acid polyalcohol as raw material is disclosed, relative to
Petroleum base polyurethane material has preferable low frequency absorption performance, but mechanical performance is poor compared with petroleum based polyurethanes, packs as acoustics
If material can guarantee the mechanical performance for further increasing material on the basis of sound absorbing performance, be capable of expansion material applies model
It encloses, and reduces operation when in use and require.
A kind of Nan Di also widely distributed plant in China, content of cellulose is high, inside be hexahedral skeleton knot
Structure.
Summary of the invention
An object of the present invention is to provide a kind of tung oil base composite polyurethane sound-absorbing material containing southern reed particle, tool
There is good low frequency absorption performance, and there is preferable mechanical performance.
The second object of the present invention is to provide a kind of system of tung oil base composite polyurethane sound-absorbing material containing southern reed particle
Preparation Method uses eleostearic acid polyalcohol for primary raw material, and on the south reed particle as filler, preparation method is simple, preparation
Sound-absorbing material have preferable low frequency absorption performance and mechanical performance.
Technical solution provided by the invention are as follows:
A kind of tung oil base composite polyurethane sound-absorbing material and preparation method thereof containing southern reed particle, it is described to contain southern reed
The component of the tung oil base composite polyurethane sound-absorbing material of grain and the mass fraction of each component are as follows:
30~40 parts of eleostearic acid polyalcohol, 2~3 parts of foaming agent, 3~4 parts of chain extender, is urged at 60~70 parts of polyether polyol
2~2.5 parts of agent, 1~2 part of foam stabiliser, 0.5~2.5 part of southern reed particle and 35~45 parts of isocyanates.
A kind of preparation method of the tung oil base composite polyurethane sound-absorbing material containing southern reed particle is used to prepare described contain
There is the tung oil base composite polyurethane sound-absorbing material of southern reed particle, includes the following steps:
Step 1: successively by eleostearic acid polyalcohol, polyether polyol, foaming agent, chain extender, catalyst, foam stabiliser
It is added in dixie cup, the substance in dixie cup is stirred, the first mixture is obtained, stand；
Step 2: pretreated southern reed particle is added in first mixture, the second mixture is obtained after stirring,
It stands；
Step 3: isocyanates is added in second mixture, third mixture is obtained after stirring；
Step 4: the third mixture is poured into mold, and pave, foams in a mold；
Step 5: foamed is taken out, after solidification, surface skining is removed, it is compound to obtain the tung oil base containing southern reed particle
Polyurethane sound absorption material.
Preferably, the method for obtaining pretreated southern reed particle, includes the following steps:
Step 1 after southern reed is cleaned peeling, is placed in crusher, crushes 4~5min with the speed of 22000rmp；
Step 2, by obtained southern reed particle mass fraction be 5% sodium hydroxide solution in, impregnate 2~3min after,
It is washed to PH and is in neutrality repeatedly with distilled water, be put into 80 DEG C of drying boxes dry 10h and take out, obtain pretreated southern reed
Grain.
Preferably, the foaming agent is deionized water, and the chain extender is triethanolamine, and the foam stabiliser is silicon
Oil, the catalyst are the triethylene diamine solution that mass fraction is 33%.
Preferably, in said step 1, after stirring 20~30s to the substance in dixie cup with 1600rpm speed, with
The speed of 1000rpm stirs 20~30s, obtains first mixture.
Preferably, in the step 2, it after pretreated southern reed particle is added, is stirred with the speed of 1000rpm
20~30s obtains the second mixture.
Preferably, in the step 3, after isocyanates is added, 10~15s is stirred with the speed of 1200rpm, is obtained
To the second mixture.
It preferably, further include that the mold is preheated to 50 DEG C before the step 4.
Preferably, cured method is carried out to the foamed in the step object are as follows:
By foamed insurance bag package, it is put into after solidifying 3~4 hours in insulating box, takes out, solidify at room temperature
24 hours.
Preferably, when solidification in insulating box, the temperature in insulating box is 50 degree.
The beneficial effects of the present invention are:
(1) the tung oil base composite polyurethane sound-absorbing material provided by the invention containing southern reed particle, sound absorption system when low frequency
Number can reach 0.66, and average noise transmitting loss reaches as high as 21.71dB, acoustical behavior is substantially better than in 18.15dB or more
Traditional petroleum base polyurethane foam.
(2) the tung oil base composite polyurethane sound-absorbing material provided by the invention containing southern reed particle, it is poly- relative to pure petroleum
For urethane, mechanical mechanics property is more preferable, and when decrement 50%, compression strength maximum can achieve 194.56kPa, and
With less volatilizable organic matter.
(3) preparation method of the tung oil base composite polyurethane sound-absorbing material provided by the invention containing southern reed particle pass through by
Eleostearic acid polyalcohol partially substitutes traditional fossil material as reactant, and southern this plant fiber of reed particle is added and fills out
Material, volatilizable content of organics is low, easily decomposes processing, more environmentally-friendly.
Detailed description of the invention
Fig. 1 is the stream of the preparation method of the tung oil base composite polyurethane sound-absorbing material of the present invention containing southern reed particle
Journey block diagram.
Fig. 2 is the acoustic absorptivity and frequency relation curve figure of sound-absorbing material in embodiment and comparative example of the present invention.
Fig. 3 is the sound transmission loss of sound-absorbing material and frequency relation curve in embodiment and comparative example of the present invention
Figure.
The compression stress strain curve figure of sound-absorbing material in Fig. 4 embodiment and comparative example of the present invention.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
The present invention provides a kind of tung oil base composite polyurethane sound-absorbing material containing southern reed particle, it is described to contain southern reed
The component of the tung oil base composite polyurethane sound-absorbing material of grain and the mass fraction of each component are as follows: eleostearic acid polyalcohol 30~40
Part, 60~70 parts of polyether polyol, 2~3 parts of foaming agent, 3~4 parts of chain extender, 2~2.5 parts of catalyst, foam stabiliser 1~2
Part, 0.5~2.5 part of southern reed particle and 35~45 parts of isocyanates.
As shown in Figure 1, the system of the present invention provides a kind of tung oil base composite polyurethane sound-absorbing material containing southern reed particle
Preparation Method, is used to prepare the tung oil base composite polyurethane sound-absorbing material containing southern reed particle, which includes such as
Lower step:
Step 1: weighing 30~40 parts of eleostearic acid polyalcohol, 60~70 parts of polyether polyol, foaming according to mass fraction
2~3 parts of agent, 3~4 parts of chain extender, 2~2.5 parts of catalyst, 1~2 part of foam stabiliser；Weighed take eleostearic acid polynary institute
Alcohol, polyether polyol, foaming agent, chain extender triethanolamine, catalyst and foam stabiliser are added sequentially in dixie cup；In room temperature
It is lower that 20~30s is stirred with 1600rpm speed first with blender, 20~30s is then stirred with the speed of 1000rpm, is mixed
Object I is closed, 3~5min is stood.
Preferably, the polyether polyol uses polyether polyol 3630, the foaming agent is deionized water, the expansion
Chain agent is triethanolamine, and the foam stabiliser is silicone oil, and the catalyst is that the triethylene diamine that mass fraction is 33% is molten
Liquid (catalyst A33).
Step 2: 0.5~2.5 part of pretreated southern reed particle is added in mixture I according to mass fraction, with
The speed of 1000rpm stirs 20~30s, obtains mixture II, stands 2~3min.
Step 3: 35~45 parts of isocyanates are added in mixture II, according to mass fraction with the speed of 1200rmp
10~15s is stirred, mixture III is obtained.
Step 4: mixture III is rapidly and uniformly poured into preheated mold, and is paved in a mold, it is allowed freely to give birth to
Long, after height to be foamed is not further added by, as foaming is completed.
Step 5: foamed is taken out, with insurance bag package, it is put into 50 DEG C of insulating boxs and solidifies 3~4 hours, then exist
Solidify 24 hours at room temperature.Material after solidification is removed into surface skining, obtains the compound poly- ammonia of tung oil base containing southern reed particle
Ester sound-absorbing material.
In another embodiment, the method for obtaining pretreated southern reed particle, includes the following steps:
Step 1 after southern reed is cleaned peeling, is placed in crusher, crushes 4~5min with the speed of 22000rmp；
Step 2, by obtained southern reed particle mass fraction be 5% sodium hydroxide solution in, impregnate 2~3min after,
It is washed to PH and is in neutrality repeatedly with distilled water, be put into 80 DEG C of drying boxes dry 10h and take out, obtain pretreated southern reed
Grain.
It in another embodiment, further include that the mold is preheated to 50 DEG C before step 4.
As a further preference, the hydroxyl value for selecting eleostearic acid polyalcohol is 21~27mgKOH/g, selects polyether polyols
The hydroxyl value of alcohol 3630 is 430~470mgKOH/g.
Wherein, the unit of the mass fraction be mass unit, can according to actual selection gram or kilogram.
Heretofore described low frequency refers to 500Hz hereinafter, high frequency refers to 2000-6300Hz.
Embodiment 1
Weigh 30 parts of eleostearic acid polyalcohol, (3630) 60 parts of polyether polyol, 2 parts of foaming agent (deionized water), chain extender
3 parts of (triethanolamine), 2 parts of catalyst (A33), 1 part of foam stabiliser (silicone oil)；And above-mentioned raw materials are added sequentially to dixie cup
In；20s is stirred with 1600rpm speed first with blender at room temperature, 20s is then stirred with the speed of 1000rpm, is mixed
Object I is closed, 3min is stood.
0.5 part of pretreated southern reed particle is added in mixture I, 20s is stirred with the speed of 1000rpm, is mixed
Object II is closed, 2min is stood.
35 parts of isocyanates are added in mixture II, 10s is stirred with the speed of 1200rmp, obtains mixture III.
Mixture III is rapidly and uniformly poured into preheated mold and is foamed.
Foamed is taken out, with insurance bag package, is put into 50 DEG C of insulating boxs and solidifies 3 hours, then solidify at room temperature
24 hours.Material after solidification is removed into surface skining, obtains the tung oil base composite polyurethane sound-absorbing material containing southern reed particle.
Embodiment 2
Weigh 35 parts of eleostearic acid polyalcohol, (3630) 65 parts of polyether polyol, 2.5 parts of foaming agent (deionized water), chain extension
3.5 parts of agent (triethanolamine), 2.3 parts of catalyst (A33), 1.5 parts of foam stabiliser (silicone oil)；And above-mentioned raw materials are sequentially added
Into dixie cup；25s is stirred with 1600rpm speed first with blender at room temperature, 25s is then stirred with the speed of 1000rpm,
Mixture I is obtained, 4min is stood.
1 part of pretreated southern reed particle is added in mixture I, 20s is stirred with the speed of 1000rpm, is mixed
Object II stands 3 minutes.
40 parts of isocyanates are added in mixture II, 15s is stirred with the speed of 1200rmp, obtains mixture III.
Mixture III is rapidly and uniformly poured into preheated mold and is foamed.
Foamed is taken out, with insurance bag package, is put into 50 DEG C of insulating boxs and solidifies 4 hours, then solidify at room temperature
24 hours.Material after solidification is removed into surface skining, obtains the tung oil base composite polyurethane sound-absorbing material containing southern reed particle.
Embodiment 3
Weigh 45 parts of eleostearic acid polyalcohol, (3630) 70 parts of polyether polyol, 3 parts of foaming agent (deionized water), chain extender
4 parts of (triethanolamine), 2.5 parts of catalyst (A33), 2 parts of foam stabiliser (silicone oil)；And above-mentioned raw materials are added sequentially to dixie cup
In；30s is stirred with 1600rpm speed first with blender at room temperature, 30s is then stirred with the speed of 1000rpm, is mixed
Object I is closed, 5min is stood.
1.5 parts of pretreated southern reed particles are added in mixture I, 30s is stirred with the speed of 1000rpm, is mixed
Object II is closed, stands 3 minutes.
45 parts of isocyanates are added in mixture II, 15s is stirred with the speed of 1200rmp, obtains mixture III.
Mixture III is rapidly and uniformly poured into preheated mold and is foamed.
Foamed is taken out, with insurance bag package, is put into 50 DEG C of insulating boxs and solidifies 4 hours, then solidify at room temperature
24 hours.Material after solidification is removed into surface skining, obtains the tung oil base composite polyurethane sound-absorbing material containing southern reed particle.
Embodiment 4
Weigh 35 parts of eleostearic acid polyalcohol, (3630) 65 parts of polyether polyol, 2.5 parts of foaming agent (deionized water), chain extension
3.5 parts of agent (triethanolamine), 2.3 parts of catalyst (A33), 1.5 parts of foam stabiliser (silicone oil)；And above-mentioned raw materials are sequentially added
Into dixie cup；25s is stirred with 1600rpm speed first with blender at room temperature, 25s is then stirred with the speed of 1000rpm,
Mixture I is obtained, 4min is stood.
2 parts of pretreated southern reed particles are added in mixture I, 20s is stirred with the speed of 1000rpm, is mixed
Object II stands 3 minutes.
40 parts of isocyanates are added in mixture II, 15s is stirred with the speed of 1200rmp, obtains mixture III.
Mixture III is rapidly and uniformly poured into preheated mold and is foamed.
Foamed is taken out, with insurance bag package, is put into 50 DEG C of insulating boxs and solidifies 4 hours, then solidify at room temperature
24 hours.Material after solidification is removed into surface skining, obtains the tung oil base composite polyurethane sound-absorbing material containing southern reed particle.
Embodiment 5
Weigh 35 parts of eleostearic acid polyalcohol, (3630) 65 parts of polyether polyol, 2.5 parts of foaming agent (deionized water), chain extension
3.5 parts of agent (triethanolamine), 2.3 parts of catalyst (A33), 1.5 parts of foam stabiliser (silicone oil)；And above-mentioned raw materials are sequentially added
Into dixie cup；25s is stirred with 1600rpm speed first with blender at room temperature, 25s is then stirred with the speed of 1000rpm,
Mixture I is obtained, 4min is stood.
2.5 parts of pretreated southern reed particles are added in mixture I, 20s is stirred with the speed of 1000rpm, is mixed
Object II is closed, stands 3 minutes.
40 parts of isocyanates are added in mixture II, 15s is stirred with the speed of 1200rmp, obtains mixture III.
Mixture III is rapidly and uniformly poured into preheated mold and is foamed.
Foamed is taken out, with insurance bag package, is put into 50 DEG C of insulating boxs and solidifies 4 hours, then solidify at room temperature
24 hours.Material after solidification is removed into surface skining, obtains the tung oil base composite polyurethane sound-absorbing material containing southern reed particle.
Comparative example 1
Weigh 35 parts of eleostearic acid polyalcohol, (3630) 65 parts of polyether polyol, 2.5 parts of foaming agent (deionized water), chain extension
3.5 parts of agent (triethanolamine), 2.3 parts of catalyst (A33), 1.5 parts of foam stabiliser (silicone oil)；And above-mentioned raw materials are sequentially added
Into dixie cup；25s is stirred with 1600rpm speed first with blender at room temperature, 25s is then stirred with the speed of 1000rpm,
Mixture I is obtained, 4min is stood.
40 parts of isocyanates are added in mixture I, 15s is stirred with the speed of 1200rmp, obtains mixture II.
Mixture II is rapidly and uniformly poured into preheated mold and is foamed.
Foamed is taken out, with insurance bag package, is put into 50 DEG C of insulating boxs and solidifies 4 hours, then solidify at room temperature
24 hours.Material after solidification is removed into surface skining, obtains the tung oil base composite polyurethane sound-absorbing material containing southern reed particle.
Comparative example 2
Weigh 35 parts of eleostearic acid polyalcohol, (3630) 65 parts of polyether polyol, 2.5 parts of foaming agent (deionized water), chain extension
3.5 parts of agent (triethanolamine), 2.3 parts of catalyst (A33), 1.5 parts of foam stabiliser (silicone oil)；And above-mentioned raw materials are sequentially added
Into dixie cup；25s is stirred with 1600rpm speed first with blender at room temperature, 25s is then stirred with the speed of 1000rpm,
Mixture I is obtained, 4min is stood.
3 parts of pretreated southern reed particles are added in mixture I, 20s is stirred with the speed of 1000rpm, is mixed
Object II stands 3 minutes.
40 parts of isocyanates are added in mixture II, 15s is stirred with the speed of 1200rmp, obtains mixture III.
Mixture III is rapidly and uniformly poured into preheated mold and is foamed.
Foamed is taken out, with insurance bag package, is put into 50 DEG C of insulating boxs and solidifies 4 hours, then solidify at room temperature
24 hours.Material after solidification is removed into surface skining, obtains the tung oil base composite polyurethane sound-absorbing material containing southern reed particle.
It was found that the big cavity that material internal at this time will appear, material is unavailable at this time.
Comparative example 3
Choose conventional pure petroleum base polyurethane sound absorption material.
By sound-absorbing material obtained in embodiment 1-5 and comparative example 1,3 at diameter 100 and 28mm, two circles of long 35mm
Cylinder carries out acoustical testing inside acoustic impedance pipe, obtains acoustic absorptivity and the transmitting loss of sound-absorbing material.
As Figure 2-3, obtain sound-absorbing material in embodiment 1, the acoustic absorptivity in low frequency between 0.12 to 0.51,
It is 19.64 decibels in the average noise transmitting loss of full frequency band.
Sound-absorbing material is obtained in embodiment 2, the acoustic absorptivity in low frequency is between 0.11 to 0.52, in the flat of full frequency band
Equal noise transmission loss is 21.71 decibels.
Sound-absorbing material is obtained in embodiment 3, the acoustic absorptivity in low frequency is between 0.12 to 0.66, in the flat of full frequency band
Equal noise transmission loss is 21.47 decibels.
Sound-absorbing material is obtained in embodiment 4, the acoustic absorptivity in low frequency is between 0.13 to 0.50, in the flat of full frequency band
Equal noise transmission loss is 18.15 decibels.
Sound-absorbing material is obtained in embodiment 5, the acoustic absorptivity in low frequency is between 0.11 to 0.50, in the flat of full frequency band
Equal noise transmission loss is 21.01 decibels.
Sound-absorbing material is obtained in comparative example 1, the acoustic absorptivity in low frequency is between 0.10 to 0.37, in the flat of full frequency band
Equal noise transmission loss is 24.85 decibels.
The sound-absorbing material of comparative example 3, the acoustic absorptivity in low frequency are made an uproar between 0.01 to 0.32 in being averaged for full frequency band
Sound transmission loss is 10.27 decibels.
Referring to testing standard GB 6669-2008 to sound-absorbing material obtained in embodiment 1-5 and comparative example 1,3 respectively into
Row compression verification.
As shown in figure 4, sound-absorbing material obtained in embodiment 1 is when decrement is 50%, compression strength maximum can reach
To 100.67kPa.
When decrement is 50%, compression strength maximum can achieve sound-absorbing material obtained in embodiment 2
124.44kPa。
When decrement is 50%, compression strength maximum can achieve sound-absorbing material obtained in embodiment 3
133.22kPa。
When decrement is 50%, compression strength maximum can achieve sound-absorbing material obtained in embodiment 4
183.22kPa。
When decrement is 50%, compression strength maximum can achieve sound-absorbing material obtained in embodiment 5
194.56kPa。
For sound-absorbing material obtained in comparative example 1 when decrement is 50%, compression strength maximum can achieve 11.44kPa.
For sound-absorbing material obtained in comparative example 3 when decrement is 50%, compression strength maximum can achieve 56.67kPa.
It is multiple to can be seen that the tung oil base provided by the invention containing southern reed particle by acoustical testing and compression verification result
Polyurethane sound absorption material is closed, acoustic absorptivity when low frequency can reach 0.66, exist in the transmitting loss of full frequency band average noise
18.15dB or more reaches as high as 21.71dB, and low frequency absorption is substantially better than traditional petroleum base polyurethane foam, at the same have compared with
Good sound insulation effect；For the eleostearic acid polyurethane sound absorption material and pure petroleum polyurethane that are not added with southern reed particle, this
The tung oil base composite polyurethane sound-absorbing material mechanical mechanics property containing southern reed particle that invention provides is more preferable, when decrement is
When 50%, compression strength maximum can achieve 194.56kPa, and have less volatilizable organic matter.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (10)
1. a kind of tung oil base composite polyurethane sound-absorbing material containing southern reed particle, which is characterized in that described to contain southern reed particle
Tung oil base composite polyurethane sound-absorbing material component and each component mass fraction it is as follows:
30~40 parts of eleostearic acid polyalcohol, 60~70 parts of polyether polyol, 2~3 parts of foaming agent, 3~4 parts of chain extender, catalyst 2
~2.5 parts, 1~2 part of foam stabiliser, 0.5~2.5 part of southern reed particle and 35~45 parts of isocyanates.
2. a kind of preparation method of the tung oil base composite polyurethane sound-absorbing material containing southern reed particle, is used to prepare such as claim
Tung oil base composite polyurethane sound-absorbing material containing southern reed particle described in 1, which comprises the steps of:
Step 1: eleostearic acid polyalcohol, polyether polyol, foaming agent, chain extender, catalyst, foam stabiliser are sequentially added
In dixie cup, the substance in dixie cup is stirred, obtains the first mixture, is stood；
Step 2: pretreated southern reed particle is added in first mixture, the second mixture is obtained after stirring, it is quiet
It sets；
Step 3: isocyanates is added in second mixture, third mixture is obtained after stirring；
Step 4: the third mixture is poured into mold, and pave, foams in a mold；
Step 5: foamed is taken out, after solidification, surface skining is removed, obtains the compound poly- ammonia of tung oil base containing southern reed particle
Ester sound-absorbing material.
3. the preparation method of the tung oil base composite polyurethane sound-absorbing material according to claim 2 containing southern reed particle,
It is characterized in that, the method for obtaining pretreated southern reed particle includes the following steps:
Step 1 after southern reed is cleaned peeling, is placed in crusher, crushes 4~5min with the speed of 22000rmp；
Step 2, by obtained southern reed particle mass fraction be 5% sodium hydroxide solution in, impregnate 2~3min after, with steaming
Distilled water is washed to PH repeatedly and is in neutrality, and is put into 80 DEG C of drying boxes dry 10h and is taken out, and pretreated southern reed particle is obtained.
4. the preparation method of the tung oil base composite polyurethane sound-absorbing material according to claim 3 containing southern reed particle,
It is characterized in that, the foaming agent is deionized water, and the chain extender is triethanolamine, and the foam stabiliser is silicone oil, described
Catalyst is the triethylene diamine solution that mass fraction is 33%.
5. the preparation method of the tung oil base composite polyurethane sound-absorbing material according to claim 3 or 4 containing southern reed particle,
It is characterized in that, in said step 1, after stirring 20~30s to the substance in dixie cup with 1600rpm speed, with 1000rpm
Speed stir 20~30s, obtain first mixture.
6. the preparation method of the tung oil base composite polyurethane sound-absorbing material according to claim 5 containing southern reed particle,
It is characterized in that, in the step 2, after pretreated southern reed particle is added, 20~30s is stirred with the speed of 1000rpm,
Obtain the second mixture.
7. the preparation method of the tung oil base composite polyurethane sound-absorbing material according to claim 6 containing southern reed particle,
It is characterized in that, in the step 3, after isocyanates is added, 10~15s is stirred with the speed of 1200rpm, it is mixed to obtain second
Close object.
8. the preparation method of the tung oil base composite polyurethane sound-absorbing material according to claim 7 containing southern reed particle,
It is characterized in that, further includes that the mold is preheated to 50 DEG C before the step 4.
9. the preparation method of the tung oil base composite polyurethane sound-absorbing material according to claim 8 containing southern reed particle,
It is characterized in that, cured method is carried out to the foamed in the step object are as follows:
By foamed insurance bag package, it is put into after solidifying 3~4 hours in insulating box, takes out, it is small to solidify 24 at room temperature
When.
10. the preparation method of the tung oil base composite polyurethane sound-absorbing material according to claim 9 containing southern reed particle,
It is characterized in that, when solidification in insulating box, the temperature in insulating box is 50 degree.
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