CN1044485C

CN1044485C - Reproduction of foamed polyurethane

Info

Publication number: CN1044485C
Application number: CN95103611A
Authority: CN
Inventors: 张金炳
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-04-07
Filing date: 1995-04-07
Publication date: 1999-08-04
Anticipated expiration: 2015-04-07
Also published as: CN1132762A

Abstract

The present invention relates to a recycle method for foamed polyurethane (PU). In the method, a raw material of waste foamed polyurethane is ground into fine granules whose granularity is smaller than 3 millimeters; then a proper amount of powdery hot-melt adhesive (with the granularity of 30 to 80 micrometers), such as polyamide or polyester, etc., is mixed with the fine granules, and the mixture is heated to be melted and then is uniformly stirred; cloth of leather is glued to the molten high molecular substance, and a finished product is obtained by cooling and shaping. The recycled foamed polyurethane can also be burnt without smoke above 800 DEG C; burnt carbon residues are ground into powder, and the powder is used as one part of raw materials in the recycle process of the foamed polyurethane; the recycled foamed polyurethane prepared in this way, has the functions of deodorization and static electricity resistance.

Description

The method of recasting polyurethane foam thing

The present invention is relevant with the removal process of urethane (PU) foaming thing, be meant especially waste polyurethane foaming thing that whether a kind of no matter its surface is fitted with cloth or cladding reclaim and remake for serviceable item for the method for recycling.

By the polyurethane foam thing of commonly using, especially use as shoe-pad, generally all can paste one deck cloth or cladding on its surface in addition, no doubt can make it have preferable sense of touch or outward appearance in the use whereby, yet by today, during fabrication, the residual waste that this shoe-pad can't re-use after cutting, and this shoe-pad becomes waste that abandons etc. after using for some time for the user, all do not have appropriate means and can be recycled.Therefore, will cause burden on its cost, then will cause the human consumer to be difficult to the source of pollution that improve on the living environment this waste material of producer.

Main purpose of the present invention is to provide a kind of method of remaking the polyurethane foam thing, and the finished product made through this method can be used as raw material, can make utilization again, and has and can constantly repeat the effect recycled.

Secondary objective of the present invention is to provide a kind of method of remaking the polyurethane foam thing, finished product and this finished product through burn after the last residue made through this method can be used as raw material, can make utilization again, and have and more increase its deodorization and anlistatig effect.

For reaching above-mentioned purpose, the method of disclosed recasting polyurethane foam thing, its step is to take an amount of polyurethane foam thing earlier as original raw material, grind to form suitable size, in this raw material, mix an amount of Powdered hot melt adhesive again, and stirred equably and heating, make it be melting shape, cooling and shaping then; In addition, this melting shape raw material its when cooling and shaping, can fit together simultaneously with a cloth or cladding; And the high-carbon residue that these finished product are obtained behind high-temp combustion can mix above-mentioned polyurethane foam thing again in the hot melt adhesive powder, with the raw material in this processing procedure of common formation, and makes its reproduced goods have deodorization and anlistatig effect.

The invention provides a kind of method of remaking the polyurethane foam thing, be to take an amount of polyurethane foam thing earlier as raw material, and no matter cloth or cladding whether have been fitted with on it, this original raw material is being lower than under subzero 40 ℃ of conditions, ground to form that minimum (diameter is less than 3 millimeters, the best is the 0.01-0.5 millimeter) particle, and and an amount of Powdered (granularity is between the 30-80 micron) hot melt adhesive stir, make this hot melt adhesive melting and in conjunction with the particle of this original raw material heating, material with this melting shape is directed on the conveying belt with a cloth or cladding again, and cooling and shaping in addition, so as to the Polyurethane of the system again and again foaming thing that its formation can be reclaimed again, and need not again viscose glue in its surface applying one cloth or cladding; Moreover this make the polyurethane foam thing more also can high-temp combustion, take the high residue of its carbon content again, and be ground into Powdered after, make the polyurethane foam thing and mix again to remake into another with aforesaid original raw material, this foaming thing has good deodorizing or antistatic effect.

Now lift a preferred embodiment of the present invention, and it is as follows to cooperate diagram to be described in further detail, wherein:

Fig. 1 is the schematic flow sheet of a preferred embodiment of the present invention.

Fig. 2 is the schematic flow sheet of another preferred embodiment of the present invention.

At first consult Fig. 1, the recasting method of polyurethane foam thing shown in the present, be to take an amount of polyurethane foam thing 10 of fitting and forming earlier by one deck sheet of polyurethane 11 and one deck cloth or cladding 12, be placed on and be lower than in the subzero 40 ℃ freezing environment, with the mode of grinding or tear make diameter less than the small-particle 13 of 3 millimeters (but to be the best between the 0.01-0.5 millimeter) as original raw material; In addition, take an amount of Powdered hot melt adhesive 14 of its granularity between the 30-80 micron, and itself and the above-mentioned polyurethane foam composition granule of having pulverized 13 placed one first container 16 jointly, and stirred, make each superfine Powdered hot melt adhesive 14 of granularity can be attached to the surface of each foaming composition granule 13 equably; And above-mentioned each polyurethane foam layer 11, cloth or cladding 12 be good with hot melt adhesive 14 its blending ratios with 8: 1: 1, and the main component of this hot melt adhesive 14 then is polyamide-based or polyester or its are good with the co-polymer of plastics such as EVA respectively.

Aforementioned each polyurethane foam thing 10 that has mixed is placed one second container 18 again with hot melt adhesive 14, and under the state that continues stirring, it is heated to 160-180 ℃, make these hot melt adhesive 14 meltings and combination be granular each polyurethane foam composition granule.

Then, take a conveying belt 20, and a measuring apparatus 22, a thickness setting device 24, a volume laminated material 26 (can be and identical cloth or the cladding in aforementioned foamed polyurethane 10 surfaces) and an inner trolley type press 28 that is provided with the cooling apparatus (not shown) are set in these conveying belt 20 the place aheads, this laminated material 26 can also extend on this conveying belt 20 via this trolley type press 28 by the one end; Then, the aforementioned material that has been the melting shape is directed at the top of this laminated material 26 with thickness setting device 24 via this measuring apparatus 22 respectively, and the two extends on this conveying belt 20 together via this trolley type press 28 to make this, and by the backing of 14 effects of this hot melt adhesive and this trolley type press 28, with making it can finish the effect of gummed, cooling and typing simultaneously, make polyurethane foam thing 30 again and form another jointly.

And this is made its waste material or this shoe-pads after being cut into shoe-pad of polyurethane foam thing 30 again and uses day waste long afterwards, can reclaim once again as to be ground in the processing procedure shown in aforementioned to be granular original raw material.

Please consult Fig. 2 again, because the aforesaid polyurethane foam thing 30 of making again is when reclaiming the process of recasting again and again, can over and over again be added an amount of hot melt adhesive 14 or laminated material 26, and the polyurethane foam layer particle 11 after feasible the pulverizing,

cloth

12,26 change gradually with the ratio of hot melt adhesive 14, thereby make it because the content of cloth 26 or hot melt adhesive 14 increases gradually, and the situation that causes its reproduced goods 30 hardness also thereupon to increase gradually, for example when its polyurethane foam thing 11,

cloth

12,26, the ratio of hot melt adhesive 14 is that the hardness of 8: 1: 1 o'clock its finished product is about 50 degree, the hardness of its finished product then will be above 70 degree when this ratio changes to 8: 2: 2.5, and this hardness will be too hard and cause inconvenience in the use.

At this moment, can carry out smokeless combustion being higher than under 800 ℃ the temperature by the polyurethane foam thing 30 of making again that this hardness is excessive, and with its burning quite high carbon slag 32 grind into powders 34 of its carbon content later, mix in the aforementioned recasting process a part again as original raw material, and, can make this make polyurethane foam material 30 again and have deodorizing and antistatic effect by the effect at this carbon ground-slag end 34.But for to avoid the hardness of these reproduced goods excessive, this powder formed carbon slag 34 accounts for the whole gross weight ratio of making urethane 30 original raw materials again should be no more than 10.

And, because these powder formed carbon slag 34 its main components are combustible carbon,,, and still can repeat again and again to recycle because of it is still quite few through the carbon slag 32 residual amounts behind the high-temp combustion even therefore be mixed with this powder formed carbon slag 34 among the reproduced goods 30.

Aforesaid step will have four advantages in the use:

One, it almost can absolutely reclaim the polyurethane foam thing, and no matter its whether be fitted with other cloth or cladding thereon.

Two, it can obtain the quite high carbon slag of purity with the process of high temperature smokeless combustion waste, for utilizing again.

Three, do not use chemical substance or materials such as polyol, isocyanic ester in its processing procedure, and only with hot melt adhesive as caking agent, therefore, for the producer, the quite convenient and safety of its processing procedure.

Four, can make the direct and cloth pasting of its reproduced goods in its processing procedure, save the cumbersome procedure of fitting with viscose glue in addition.

Claims

1, a kind of method of remaking the polyurethane foam thing is characterized in that including following manufacturing step:

A. take an amount of polyurethane foam thing as original raw material, and be ground into diameter less than 3 millimeters fragment or particle;

B. taking an amount of is the Powdered hot melt adhesive of major ingredient with polyamide-based or polyester material;

C. place proper container to stir the material in a, the b item;

D. the material in the c item is heated to the temperature that can make the hot melt adhesive melting under the state that continues to be stirred;

E. the melting shape material in the d item is imported on the conveying belt after through a gauger or a thickness setting device and a cooling and shaping device.

2,, it is characterized in that this foamed polyurethane includes the cloth or the cladding of predetermined proportion, and its particle diameter after grinding is between the 0.01-0.5 millimeter according to the method for the described recasting polyurethane foam of claim 1 thing.

3,, it is characterized in that this polyurethane foam thing is to form being lower than under the subzero 40 ℃ environment to grind according to the method for claim 1 or 2 described recasting polyurethane foam things.

4, according to the method for the described recasting polyurethane foam of claim 1 thing, the granularity that it is characterized in that this hot melt adhesive powder is between the 30-80 micron.

5,, it is characterized in that the blending ratio of its urethane particle of the material described in the c item, cloth or cladding and hot melt adhesive is between 8: 1: 1 to 8: 2: 2.5 according to the method for the described recasting polyurethane foam of claim 1 thing.

6, according to the method for the described recasting polyurethane foam of claim 1 thing, it is characterized in that the material described in the d item is to be heated to 160-180 ℃, make hot melt adhesive melting and combination be granular each polyurethane foam composition granule.

7, according to the method for the described recasting polyurethane foam of claim 1 thing, it is characterized in that the melting shape material described in the e item is before cooling and shaping, can import one of tool preset width and thickness cloth or cladding again or the below thereon so that this two can be combined into one.

8,, it is characterized in that the material described in the c item can mix the carbonaceous material of the gross weight 10 following ratios that account for original raw material and hot melt adhesive in addition according to the method for the described recasting polyurethane foam of claim 1 thing.

9, according to the method for the described recasting polyurethane foam of claim 8 thing, it is characterized in that this carbonaceous material be in the claim 1 a or the described material of e item via the remaining residue in proper temperature burning back.