TW202006020A - Use of PEBA foams to filter vibrations - Google Patents

Abstract

The invention concerns the use of a copolymer foam having polyamide blocks and polyether blocks to filter vibrations. The invention can be applied to the manufacture of vibration filtering parts such as the feet of food processors of blender or mixer type, parts of motor vehicles or any vehicle, in particular suspension devices of automotive gearboxes or suspension devices of helicopter gearboxes.

Description

Use PEBA foam to filter out vibration

Field of invention The present invention relates to the use of a copolymer foam having a polyamide block and a polyether block, which is used to filter out vibration.

Background of the invention In many applications, for example, in the field of small electrical appliances or the automotive sector, it may be desirable to incorporate tools in these appliances to filter out the vibrations emitted by the appliance. Some polymer foams have proved promising for such tools.

Document FR 3047245 describes a PEBA foam having a high ability to recover elastic energy under low constraint stress, low compression setting and high compression fatigue resistance. These foams also have interesting anti-shock, anti-vibration and anti-noise properties. However, there is no mention of vibration filtering properties.

Therefore, there is a real need to provide a material that can effectively filter out vibrations.

Summary of the invention The present invention first relates to the use of a foam of a polyamide polyether block copolymer having a polyamide block and a polyether block, which is used to filter out vibration.

In some specific examples, the foaming system is not cross-linked.

In some specific examples, the polyamide block is the following block: Polyamide 6, Polyamide 11, Polyamide 12, Polyamide 5.4, Polyamide 5.9, Polyamide 5.10, Polyamide Amide 5.12, Polyamide 5.13, Polyamide 5.14, Polyamide 5.16, Polyamide 5.18, Polyamide 5.36, Polyamide 6.4, Polyamide 6.9, Polyamide 6.10, Polyamide 6.12, Poly Amide 6.13, Polyamide 6.14, Polyamide 6.16, Polyamide 6.18, Polyamide 6.36, Polyamide 10.4, Polyamide 10.9, Polyamide 10.10, Polyamide 10.12, Polyamide 10.13, Poly Amide 10.14, Polyamide 10.16, Polyamide 10.18, Polyamide 10.36, Polyamide 10.T, Polyamide 12.4, Polyamide 12.9, Polyamide 12.10, Polyamide 12.12, Polyamide 12.13 , Polyamide 12.14, Polyamide 12.16, Polyamide 12.18, Polyamide 12.36, Polyamide 12.T, or mixtures or copolymers thereof, preferably Polyamide 11, Polyamide 12, Polyamide Amine 6 or Polyamide 6.10.

In some specific examples, the polyether block is the following block: polyethylene glycol, propylene glycol, polytrimethylene glycol, polytetrahydrofuran, or a mixture or copolymer thereof, preferably polyethylene glycol Or polytetrahydrofuran.

In some specific examples: The polyamide block of the copolymer has a number average molecular weight of 100 to 20,000 g/mole, preferably 200 to 10,000 g/mole, further preferably 200 to 1500 g/mole; and/or The polyether block of the copolymer has a number average molecular weight of 100 to 6000 g/mole, preferably 200 to 3000 g/mole, further preferably 800 to 2500 g/mole.

In some specific examples, the weight ratio of the polyamide block to the polyether block of the copolymer is 0.1 to 10, preferably 0.3 to 3, further preferably 0.3 to 0.9.

In some specific examples, the foam has a density of less than or equal to 800 kg/m3, preferably less than or equal to 600 kg/m3, and more preferably less than or equal to 400 kg/m3 Ruler, and the best is less than or equal to 300 kg/m3.

In some specific examples, the foam also includes one or more additives, preferably selected from the group consisting of copolymers of ethylene and vinyl acetate, copolymers of ethylene and acrylate, and ethylene and (methyl) Copolymer of alkyl acrylate.

The present invention also relates to a vibration filtering member composed of a foam of a polyamide polyether block copolymer as defined above.

The present invention also relates to a vibration filtering member comprising at least one element, which is composed of a foam of a polyimide polyether block copolymer such as defined above.

In some specific examples, the vibration filtering component is selected from the following: a base of a food conditioner such as a blender and a mixer; a component of a motor vehicle or any vehicle, such as a suspension device of a gearbox of a motor vehicle or Suspension device for helicopter gearbox.

The present invention satisfies the needs expressed above. In particular, it provides a lightweight, recyclable polymer foam that allows efficient filtration of vibration.

This is achieved by using copolymers with polyamide blocks and polyether blocks.

Detailed description of the preferred embodiment The following provides a more detailed, non-limiting description of the invention.

The present invention relates to the use of a foam of polyamide polyether block copolymer (PEBA), which is used to filter out vibration.

The filtering of the vibration is to block the high frequency, that is, the frequency higher than the frequency of the object itself in the filtering material multiplied by 1.4.

It is an application that differs from the absorption of shocks, such as mentioned for example in the document FR 3047245.

PEBAs are produced from the polycondensation of polyamide blocks with reactive end groups and polyether blocks with reactive end groups, especially polycondensation such as the following: 1) Polyamide block with diamine chain ends and polyoxyalkylene block with dicarboxylic acid chain ends; 2) Polyamide block with dicarboxylic acid chain ends and polyoxyalkylene block with diamine chain ends, wherein the polyoxyalkylene block is, for example, via an aliphatic group called polyetherdiol cyanoethylation and hydrogenation of α,ω-dihydroxylated polyoxyalkylene block; 3) Polyamide blocks and polyether diols with dicarboxylic acid chain ends. In this particular case, the product obtained is polyetheresteramide.

The polyamide block having a dicarboxylic acid chain end is derived, for example, from the condensation of a polyamide precursor in the presence of the chain limiter carboxylic acid. The polyamide block having diamine chain ends is derived, for example, from the condensation of a polyamide precursor in the presence of a diamine chain restrictor.

Advantageously, three types of polyamide blocks can be used.

According to a first version, the polyamide block is derived from carboxylic diacids, especially those having 4 to 20 carbon atoms, preferably those having 6 to 18 carbon atoms; and aliphatic or aromatic diamines The condensation, especially those having 2 to 20 carbon atoms, is preferably those having 6 to 14 carbon atoms.

As for the examples of the dicarboxylic acid, there may be mentioned 1,4-cyclohexyl dicarboxylic acid, succinic acid, adipic acid, azelaic acid, suberic acid, sebacic acid, dodecane dicarboxylic acid, Octadecane dicarboxylic acid, terephthalic acid, and isophthalic acid, but also dimerized fatty acids.

(BAMN)及哌

(Pip)。As for the examples of diamines, mention may be made of butanediamine, hexamethylenediamine, 1,10-decanediamine, dodecylmethyldiamine, trimethylhexamethylenediamine; bis-(4 -Aminocyclohexyl)-methane (BACM), bis-(3-methyl-4-aminocyclohexyl)methane (BMACM) and 2-2-bis-(3-methyl-4-aminocyclohexyl) )-Propane (BMACP) isomers; p-amino-di-cyclo-hexyl-methane (PACM), isophorone diamine (IPDA), 2,6-bis-(aminomethyl)- drop

(BAMN) and piper

(Pip).

Advantageously, the following polyamide blocks are used: PA 4.12, PA 4.14, PA 4.18, PA 6.10, PA 6.12, PA 6.14, PA 6.18, PA 9.12, PA 10.10, PA 10.12, PA 10.14 and PA 10.18. In the labeling of PA X.Y, as is conventional, X is the number of carbon atoms derived from diamine residues, and Y is the number of carbon atoms derived from diacid residues.

According to a second version, the polyamide block is derived from one or more α,ω-aminocarboxylic acids having 6 to 12 carbon atoms in the presence of carboxylic diacids or diamines having 4 to 12 carbon atoms and /Or condensation of one or more amides. As for the examples of internal amides, mention may be made of caprolactam, heptamylamide, and lauryllactam. As for the examples of α,ω-aminocarboxylic acids, mention may be made of aminohexanoic acid, amino-7-heptanoic acid, amino-11-undecanoic acid and amino-12-dodecanoic acid .

Advantageously, the second type of polyamide block is a block of PA 11 (polyundecaneamide), PA 12 (polydodecaneamide) or PA 6 (polycaprolactam). In the labeling of PA X, X is the number of carbon atoms derived from amino acid residues.

According to a third version, the polyamide block is produced from the condensation of at least one α,ω-amino carboxylic acid (or lactam), at least one diamine and at least one carboxylic diacid.

In this case, the polyamide block PA is prepared by the following polycondensation: Linear or aromatic aliphatic diamines with X carbon atoms; Carboxylic acid with Y carbon atoms; and Co-monomers {Z} selected from the group consisting of internal amides and α,ω-aminocarboxylic acids with Z carbon atoms; and at least one diamine with X1 carbon atoms and at least one with Y1 carbon Molar mixture of atomic carboxylic acid, (X1, Y1) is different from (X, Y); The comonomer {Z} is advantageously introduced in a weight ratio range of up to 50% relative to all polyamide precursor monomers, preferably up to 20%, and more advantageously up to 10%; In the presence of a chain-limiting agent selected from carboxylic acid.

Advantageously, a carboxylic diacid having Y atoms is used as the chain limiting agent, which is introduced in excess in stoichiometry relative to the diamine.

(BAMN)及哌

。According to various variations of this third type, the polyamide block is generated in the presence of a selective chain restrictor, at least two α,ω-aminocarboxylic acids having 6 to 12 carbon atoms or at least two internal amides Condensation of amines, or amides and aminocarboxylic acids with different numbers of carbon atoms. As examples of aliphatic α,ω-aminocarboxylic acids, mention may be made of aminohexanoic acid, amino-7-heptanoic acid, amino-11-undecanoic acid, and amino-12-dodecane Alkanoic acid. As for the examples of internal amides, mention may be made of caprolactam, heptamylamide, and lauryllactam. As for the examples of the aliphatic diamine, hexamethylenediamine, dodecylmethyldiamine and trimethylhexamethylenediamine can be cited. As for the examples of cycloaliphatic diacids, 1,4-cyclohexyldicarboxylic acid can be cited. As examples of aliphatic diacids, mention may be made of succinic acid, adipic acid, azelaic acid, suberic acid, sebacic acid, dodecane dicarboxylic acid, dimerized fatty acids. These dimerized fatty acids preferably have a dimer content of at least 98%; preferably, they are hydrogenated; for example, they are trade names from "CRODA" to "PRIPOL" or from BASF to EMPOL Trade name, or products sold by OLEON under the trade name Radiacid, and polyoxyalkylene α,ω-diacids. As for the examples of the aromatic diacid, terephthalic acid (T) and isophthalic acid (I) can be cited. As for the examples of cycloaliphatic diamines, mention may be made of bis-(4-aminocyclohexyl)-methane (BACM), bis-(3-methyl-4-aminocyclohexyl)-methane (BMACM ) And 2-2-bis-(3-methyl-4-aminocyclohexyl)-propane (BMACP) isomers, and p-amino-di-cyclo-hexyl-methane (PACM). Other commonly used diamines can be isophorone diamine (IPDA), 2,6-bis-(aminomethyl)-nor

(BAMN) and piper

.

As for the third type of polyamide block embodiment, the following can be cited: PA 6.6/6, where 6.6 indicates the hexamethylenediamine unit condensed with adipic acid, and 6 indicates the unit that produces the condensation of its own amide; PA 6.6/6.10/11/12, of which 6.6 indicates hexamethylenediamine condensed with adipic acid, 6.10 indicates hexamethylenediamine condensed with sebacic acid, and 11 indicates the condensation resulting from amino undecanoic acid Units and 12 indicate units that originate from the condensation of lauryl lactam.

The labels of PA X/Y, PA X/Y/Z, etc. refer to copolyamides, where X, Y, Z, etc. represent homopolyamide units such as those described above.

Advantageously, the polyamide block of the copolymer used in the present invention comprises the following polyamide blocks: PA 6, PA 11, PA 12, PA 5.4, PA 5.9, PA 5.10, PA 5.12, PA 5.13, PA 5.14, PA 5.16, PA 5.18, PA 5.36, PA 6.4, PA 6.9, PA 6.10, PA 6.12, PA 6.13, PA 6.14, PA 6.16, PA 6.18, PA 6.36, PA 10.4, PA 10.9, PA 10.10, PA 10.12, PA 10.13, PA 10.14, PA 10.16, PA 10.18, PA 10.36, PA 10.T, PA 12.4, PA 12.9, PA 12.10, PA 12.12, PA 12.13, PA 12.14, PA 12.16, PA 12.18, PA 12.36, PA 12.T, or a mixture or copolymer thereof; and preferably contains the following polyamide blocks: PA 6, PA 11, PA 12, PA 6.10, PA 10.10, PA 10.12, or a mixture or copolymer thereof.

The polyether block is composed of alkylene oxide units.

In particular, the polyether block may be a PEG (polyethylene glycol) block, that is, composed of ethylene oxide units; and/or a PPG (propylene glycol) block, that is, composed of propylene oxide units; and /Or PO3G (polytrimethylene glycol) block, ie, composed of polytrimethylene ether glycol units; and/or PTMG block, ie, composed of 1,4-butanediol units Composed of polytetrahydrofuran. The PEBA copolymer may contain several types of polyether in its chain, where the copolyether may be block or statistical.

Blocks obtained by oxyethylation of bisphenols such as, for example, bisphenol A can also be used. The latter product is particularly described in the document EP 613919.

其中m及n係在1至20間之整數及x係在8至18間之整數。這些產物例如可以來自CECA的NORAMOX®商品名稱，及來自CLARIANT的GENAMIN®商品名稱商業購得。The polyether block can also be composed of ethoxylated primary amines. As for the examples of ethoxylated primary amines, there may be mentioned products having the following formula:

Where m and n are integers between 1 and 20 and x is an integer between 8 and 18. These products are commercially available, for example, under the NORAMOX® trade name from CECA, and the GENAMIN® trade name from CLARIANT.

The flexible polyether block may include a polyoxyalkylene block having NH ₂ chain ends, which block can be extended by an aliphatic α,ω-dihydroxylated polyoxy group called polyetherdiol The cyanoacetylation of the alkyl block is obtained. More specifically, commercial products Jeffamine or Elastamine can be used (for example, the products Jeffamine® D400, D2000, ED 2003, XTJ 542 sold by Huntsman, which are also described in documents JP 2004346274, JP 2004352794 and EP 1482011).

The polyether diol block is used in this way and is co-condensed with a polyamide block having a carboxylic acid end, or is converted into a polyether diamine and a polyamide block having a carboxylic acid end through amination condensation. The general two-step preparation method of PEBA copolymers with ester linkages between PA blocks and PE blocks is known and described for example in document FR 2846332. This general method for preparing the PEBA copolymer of the present invention having an amide bond between a PA block and a PE block is known and described for example in the document EP 1482011. The polyether block can also be mixed with a polyamide precursor and a diacid chain limiter to prepare the polyamide polyether block polymer with statistical distribution units (one-step method).

Of course, the title PEBA in this description of the invention relates to PEBAX® products sold by Arkema, Vestamid® products sold by Evonik®, Grilamid® products sold by EMS, and PEBA-type Pelestat® products sold by Sanyo, Or any other PEBA from other suppliers.

Although the block copolymers described above generally contain at least one polyamide block and at least one polyether block, the present invention also encompasses two, three, four (or even more) selected from the descriptions in the present invention. For all alloys of copolymers of different blocks among those, the limitation is that these blocks include at least polyamide and polyether blocks.

For example, the copolymer alloy of the present invention may include a segmented block copolymer containing three different types of blocks (or «triblocks») resulting from the condensation of several of the above blocks. The triblock is preferably selected from copolyetheresteramide and copolyetheramideamine carbamate.

In the present invention, a particularly preferred PEBA copolymer is a copolymer containing the following blocks: PA 11 and PEG; PA 11 and PTMG; PA 12 and PEG; PA 12 and PTMG; PA 6.10 and PEG; PA 6.10 and PTMG; PA 6 and PEG; PA 6 and PTMG.

The foam of the present invention contains a PEBA copolymer such as described above, and it is preferred to use only one of such copolymers. However, mixtures of two or more PEBA copolymers as described above can be used.

The number average molecular weight of the polyamide block in the PEBA copolymer is preferably 100 to 20,000 g/mole, more preferably 200 to 10,000 g/mole, and still more preferably 200 to 1500 g/mole. In some specific examples, the number average molecular weight of the polyamide block in the PEBA copolymer is 100 to 200 g/mole, or 200 to 500 g/mole, or 500 to 1000 g/mole, Or 1000 to 1500 g/mole, or 1500 to 2000 g/mole, or 2000 to 2500 g/mole, or 2500 to 3000 g/mole, or 3000 to 3500 g/mole, or 3500 to 4000 g /Mole, or 4000 to 5000 g/mole, or 5000 to 6000 g/mole, or 6000 to 7000 g/mole, or 7000 to 8000 g/mole, or 8000 to 9000 g/mole, or 9000 to 10000 g/mole, or 10000 to 11000 g/mole, or 11000 to 12000 g/mole, or 12000 to 13000 g/mole, or 13000 to 14000 g/mole, or 14000 to 15000 g/mole Molar, or 15000 to 16000 g/mole, or 16000 to 17000 g/mole, or 17000 to 18000 g/mole, or 18000 to 19000 g/mole, or 19000 to 20000 g/mole.

The number average molecular weight of the polyether block is preferably 100 to 6000 g/mole, more preferably 200 to 3000 g/mole, and even more preferably 800 to 2500 g/mole. In some specific examples, the number average molecular weight of the polyether block is 100 to 200 g/mole, or 200 to 500 g/mole, or 500 to 800 g/mole, or 800 to 1000 g/mole Ear, or 1000 to 1500 g/mole, or 1500 to 2000 g/mole, or 2000 to 2500 g/mole, or 2500 to 3000 g/mole, or 3000 to 3500 g/mole, or 3500 to 4000 g/mole, or 4000 to 4500 g/mole, or 4500 to 5000 g/mole, or 5000 to 5500 g/mole, or 5500 to 6000 g/mole.

The number average molecular weight is determined by the chain limiter content. It can be calculated by the following relationship: M _n =n _monomer xMW _{repeating unit} /n _{chain limiter} +MW _{chain limiter}

In this formula, n _monomer represents the number of moles of the monomer, n- _{chain restrictor} represents the number of moles in excess of the restricting agent (for example, diacid), MW _{repeating unit} represents the molecular weight of the repeating unit, and MW _{The chain limiter} represents the molecular weight of the limiter (for example, diacid) in excess.

The number average molecular weight of the polyamide block and polyether block can be measured by gel permeation chromatography (GPC) before the copolymerization of the blocks.

Advantageously, the weight ratio of the polyamide block to the polyether block of the copolymer is 0.1 to 10, preferably 0.3 to 3, and more preferably 0.3 to 0.9. In particular, the weight ratio of the polyamide block to the polyether block of the copolymer may be 0.1 to 0.2, or 0.2 to 0.3, or 0.3 to 0.4, or 0.4 to 0.5, or 0.5 to 0.6, or 0.6 to 0.7, or 0.7 to 0.8, or 0.8 to 0.9, or 0.9 to 1, or 1 to 1.5, or 1.5 to 2, or 2 to 2.5, or 2.5 to 3, or 3 to 3.5, or 3.5 to 4, or 4 to 4.5, or 4.5 to 5, or 5 to 5.5, or 5.5 to 6, or 6 to 6.5, or 6.5 to 7, or 7 to 7.5, or 7.5 to 8, or 8 to 8.5, or 8.5 to 9, or 9 to 9.5, or 9.5 to 10.

Preferably, the copolymer used in the present invention has an immediate hardness lower than or equal to 40 Shore D, and more preferably lower than or equal to 35 Shore D. The hardness measurement can be carried out according to the standard ISO 868.

The polyamide polyether block copolymer is used to form a foam, preferably without a cross-linking step. The foaming system is formed by mixing a copolymer and a foaming agent in a molten state, and then performing a foaming step.

In a specific example, the foam thus formed essentially consists of or even consists of the copolymer described above (or the copolymer if a copolymer mixture is used) and a selective blowing agent, if the latter When left in the foam pores, especially if it is a closed-cell foam.

The polyamide polyether block copolymer can be combined with various additives, for example, copolymers of ethylene and vinyl acetate or EVA (for example, those sold under the trade name Evatane® by Arkema), or those of ethylene and acrylate Copolymers, or copolymers of ethylene and alkyl (meth)acrylates (for example, those sold under the trade name Lotryl® by Arkema). These additives may allow adjustment of the hardness, appearance and comfort of the foamed part. The additive can be added in an amount of 0 to 50% by weight relative to the polyamide polyether block copolymer, preferably 5 to 30% by weight.

The blowing agent may be a chemical or physical agent. Preferably, it is a physical agent, such as, for example, molecular nitrogen or carbon dioxide, or hydrocarbons, chlorofluorocarbons, hydrochlorocarbons, hydrofluorocarbons or hydrochlorofluorocarbons (saturated or unsaturated). For example, butane or pentane can be used.

The physical blowing agent is mixed with the copolymer in liquid or supercritical form and then converted to the gas phase during the foaming step.

In a preferred embodiment, the mixture of the copolymer and the blowing agent is injected into a mold and foaming is generated by opening the mold. This technology allows the direct manufacture of three-dimensional foam objects with complex geometries.

Especially compared with some methods for melting foamed particles such as those described in the prior art, it is also a relatively simple technique to perform, more precisely, the prior art is to fill the mold with expanded polymer particles Then, the particles are melted to ensure the mechanical strength of the part without damaging the foam structure, which is a complicated operation.

Other foaming techniques that can be used are in particular "batch" foaming and extrusion foaming.

The foam of the present invention preferably has a density of less than or equal to 800 kg/m3, more preferably less than or equal to 600 kg/m3, and even more preferably less than or equal to 400 kg/m3. , Even lower than or equal to 300 kg/m3. For example, it may have a density of 50 to 800 kg/m3, and preferably 100 to 600 kg/m3. Control over density can be achieved by adapting the parameters of the manufacturing method.

Preferably, according to ISO standard 8307, the foam has a resilience higher than or equal to 55%.

Preferably, according to ISO standard 7214, the foam has a compression setting of less than or equal to 10% and more preferably less than or equal to 8%.

Preferably, the foam also has excellent fatigue resistance and damping.

The foam of the present invention can be used to manufacture vibration filtering parts. For example, these may be the bases of food conditioners such as kitchen blenders and mixers. They can also be parts of motor vehicles or any vehicle, such as aviation or ship vehicles, such as helicopters, aircraft, ships. Examples of such filtering components include suspension devices for automobile gearboxes and helicopter gearboxes.

One advantage of the foamed articles of the present invention is that they can be easily recycled, for example by melting them in an extruder equipped with a degassing outlet (optionally after cutting the article into pieces). Examples

The following examples illustrate but do not limit the invention.

In the following examples, the tangent δ (tan δ) of PEBAs (foamed or non-foamed) is calculated by the ratio of the loss modulus E” to the storage modulus E′. The loss modulus E” and The storage modulus E'is measured by dynamic mechanical analysis (DMA). Example 1

A foam is formed from PEBA A (called «foamed PEBA A-1»). The density of the foamed PEBA is 0.65 g/cm3.

PEBA A series copolymers containing PA 11 block and PTMG block, density 1.02 g/cm3, melting temperature 135℃ and hardness 32 Shore D 15s.

The foamed PEBA A-1 series is compared with the non-foamed PEBA A.

The tangent δ of the foamed PEBA A-1 and non-foamed PEBA A was measured as indicated above. The operating conditions for using DMA to measure the loss modulus E” and the storage modulus E’ are as follows: – Instruments used: DMA Q800 2; – Geometry (tool): tension/double cantilever; – Test: Scan the temperature with a jump of 2°C/min; – Frequency: 1 Hz; – Amplitude: 20 microns.

The results are always organized in the following table.

The tangent δ of the foamed PEBA A-1 is shown to be lower than that of the non-foamed PEBA, therefore, it has better vibration filtering properties at the test temperature. Example 2

A foam is formed from PEBA B (called «foamed PEBA B»). The density of the foamed PEBA B is 0.1 g/cm3.

PEBA B series copolymer containing PA 12 block and PTMG block, density 1.01 g/cm3, melting temperature 159℃ and hardness 50 Shore D 15s.

The foamed PEBA B series is compared with the non-foamed PEBA B.

The tangent δ of the foamed PEBA B and the non-foamed PEBA B is measured as indicated above. The operating conditions for measuring the loss modulus E" and the storage modulus E'by DMA are the same as in Example 1.

The results are summarized in Figure 1.

The tangent delta of the foamed PEBA B is lower than that of the non-foamed PEBA B, therefore, it has better vibration filtering properties at the test temperature. Example 3

Formed a foam from PEBA A (called «foamed PEBA-2»). The density of the foamed PEBA A‑2 is 0.2 g/cm3.

The tangent δ of the foamed PEBA A-2 was measured as indicated above. The operating conditions for measuring the loss modulus E" and the storage modulus E'by DMA are as follows: – The instrument used: Q800; – Tool: Compressed on a 12 mm diameter pad cut from the foam; – Test: sweep from 10 Hz to 100 Hz; – Temperature: 20°C; – Applied deformation: 0.1%; – Static power: 5 Newtons.

The results are summarized in Figure 2.

The PEBA A-2 foam shows a very low tangent δ at 20°C in a wide frequency range.

Fig. 1 provides a curve obtained by dynamic mechanical analysis when measuring the tangent δ of the foamed PEBA B (imaginary gray curve) and the non-foamed PEBA B (solid black curve) described in Example 2. The temperature (in °C) is provided along the X axis and the tangent δ along the Y axis. FIG. 2 provides a curve obtained by dynamic mechanical analysis when measuring the tangent δ of the foamed PEBA A-2 described in Example 3. FIG. The frequency (in Hertz) is provided along the X axis and the tangent δ along the Y axis.

Claims (11)

The utility model relates to a foaming body of polyamide polyether block copolymer, which is used to filter out vibration. For the use of claim 1, wherein the foaming system is not cross-linked. For the use according to claim 1 or 2, wherein the polyamide block is the following block: Polyamide 6, Polyamide 11, Polyamide 12, Polyamide 5.4, Polyamide 5.9, Polyamide 5.10, Polyamide 5.12, Polyamide 5.13, Polyamide 5.14, Polyamide 5.16, Polyamide 5.18, Polyamide 5.36, Polyamide 6.4, Polyamide 6.9, Polyamide 6.10, Polyamide 6.12, Polyamide 6.13, Polyamide 6.14, Polyamide 6.16, Polyamide 6.18, Polyamide 6.36, Polyamide 10.4, Polyamide 10.9, Polyamide 10.10, Polyamide 10.12, Polyamide 10.13, Polyamide 10.14, Polyamide 10.16, Polyamide 10.18, Polyamide 10.36, Polyamide 10.T, Polyamide 12.4, Polyamide 12.9, Polyamide 12.10, Polyamide 12.12, Poly Amine 12.13, Polyamide 12.14, Polyamide 12.16, Polyamide 12.18, Polyamide 12.36, Polyamide 12.T, or mixtures or copolymers thereof, preferably polyamide 11, polyamide 12 , Polyamide 6 or Polyamide 6.10. The use according to any one of claims 1 to 3, wherein the polyether block is the following block: polyethylene glycol, propylene glycol, polytrimethylene glycol, polytetrahydrofuran, or a mixture or copolymer thereof, It is preferably polyethylene glycol or polytetrahydrofuran. For the use of any one of claims 1 to 4, wherein: The polyamide block of the copolymer has a number average molecular weight of 100 to 20,000 g/mole, preferably 200 to 10,000 g/mole, more preferably 200 to 1500 g/mole; and/or The polyether block of the copolymer has a number average molecular weight of 100 to 6000 g/mole, preferably 200 to 3000 g/mole, more preferably 800 to 2500 g/mole. The use according to any one of claims 1 to 5, wherein the weight ratio of the polyamide block to the polyether block of the copolymer is 0.1 to 10, preferably 0.3 to 3, more preferably 0.3 to 0.9 . The use according to any one of claims 1 to 6, wherein the foam has a density of less than or equal to 800 kg/m3, preferably less than or equal to 600 kg/m3, more preferably less than It is equal to or equal to 400 kg/m3, and more preferably, it is lower than or equal to 300 kg/m3. The use according to any one of claims 1 to 7, wherein the foam also includes one or more additives, preferably selected from the following: copolymers of ethylene and vinyl acetate, copolymers of ethylene and acrylate And copolymers of ethylene and alkyl (meth)acrylate. A vibration filtering member composed of a foam of a polyimide polyether block copolymer as defined in any one of claims 1 to 8. A vibration filtering member comprising at least one element composed of a foam of polyamidopolyether block copolymer as defined in any one of claims 1 to 8. The vibration filtering component according to claim 9 or 10, which is selected from the following: food conditioner such as the base of a blender and mixer, a component of a motor vehicle or any vehicle, such as a suspension device of a motor vehicle gearbox Or the suspension device of helicopter gearbox.

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