JPS62502854A - Compositions based on bitumen and elastomers and their use for vibration protection - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Compositions based on bitumen and elastomers and their use for vibration protection The present invention relates to a composition for anti-photography based on bitumen and elastomer, and and its use in sound-absorbing structures.

Polymers can be dissolved or dispersed in bitumen to simulate their physical properties. For example, it is known that the filter has been modified to be suitable for use in vibration prevention. France Patent No. 7418124 mainly uses bitumen, polystyrene, and mineral filling. The present invention discloses a soundproofing material which is composed of a filler and is used as a viscoelastic vibration damping material.

Viscoelastic vibration damping compositions can be used as simple or stressed coatings. Wear.

In the case of simple cladding, a layer of viscoelastic material is distributed over the entire surface of the structure. Combine strongly. When a structure is deformed by bending, tensile stress is generated in the viscoelastic material. As the viscoelastic layer becomes thinner, a part of the load energy is dissipated. It is obtained when it has a high characteristic coefficient and a high Young's modulus.

In the case of stressed or “sandwich” cladding, the viscoelastic layer is Alternatively, it is interposed between two elastic layers such as aluminum. Due to bending of the structure When deformed, viscoelastic materials are subjected to strong shear stresses. Maximum sandwich dimensions Viscous material with optimized and high specific damping coefficient and Young's modulus of 106-108 N/m2 Good vibration isolation is achieved by using elastic materials.

An important requirement for viscoelastic materials used for vibration protection is that they have good mechanical resistance, That is, it must have a high torsional modulus and a high loss angle. Sara an elastic protective layer (known as a stress layer), for example a steel plate or a thin aluminum film. Traditionally used for vibration prevention from a vibration isolating sheet made of viscoelastic material whose surface is covered with The bitumen-polymer composition has good mechanical properties over a narrow temperature range. and anti-vibration properties, but these properties are highly temperature dependent for these materials. It turned out that.

This time, we will introduce a special bitumen known as high penetration index bitumen and elastane. If an elastomeric bitumen composition consisting of a polymer is used for vibration prevention, , the mechanical properties and anti-vibration properties are good and show almost no change due to temperature. But it was discovered.

According to the invention, therefore, 70-95% by weight of high penetration index bitumen ( The value of this index is +1 to +7) and 5 to 30% by weight of elastomer polymer. An elastomeric bitumen composition is provided.

In general, the present invention relates to a method for producing a product of this type, as well as to its use in a sound-dampening structure. It relates to the use of the composition.

The penetration index of bitumen is determined by measuring the penetration value of bitumen at various temperatures. can be done. This is a function of the temperature sensitivity of the bitumen. Because this is This is because it has the characteristics of a logarithmic curve of penetration with respect to the logarithm of temperature. The value is given by the following formula Thus it is shown: 1oc+p1 1o P-1x1 sho" YuT1-T2 50 10+PI The high penetration index bitumen used in the present invention is the residue obtained from atmospheric distillation of crude oil. distillate or vacuum distillation residue of crude oil or a mixture of these two residues in the presence of a catalyst. It can be obtained by oxidation in the presence of Preferably, the bitumen with a high penetration index is 2 100-250x at 5℃, preferably 140-200x 1/10mm1 It has a penetration of 1/10mm. This kind of bitumen is covered by French patent no. It can be manufactured according to the method described in 64615@publication. Preferably, the elastomeric polymer is an elastomeric block copolymer, more preferably an elastomeric block copolymer. Alternatively, it is composed of styrene and a conjugated diene. Particularly suitable elastomeric polymers are It is a tyrene/butadiene/styrene block copolymer, and the branched type polymer is particularly suitable for

In particular, when used in simple anti-vibration technology, the composition contains a small amount of filler by weight. You can also do that. In this way, the layered mica (vermiculite) type is introduced into the mixture. Introducing fillers together with calcium carbonate (spherical filler) increases the torsional rigidity of the vibration damping material. improve the inherent anti-vibration properties of the bitumen/polymer composition without having a detrimental effect. You can prevent it from happening.

The composition according to the invention is made by applying the polymer to high penetration index bitumen at 180-250°C. preferably as close to, but not exceeding, 200°C. It is made by dissolving or dispersing at a certain temperature to prevent deterioration of the quality of the composite. can be achieved. Typically used mixing times are 1-3 hours, preferably 2 hours. It is about between 1 and 2.

The degree of compaction of mixtures thus created can be increased by calendering. However, plates of this mixture can also be cast directly onto the stress layer to form a composite. can. If the mixture is used according to the stress damping technique, the composite product will have a stress One surface is covered with a protective layer known as a layer, and the ground surface is covered with release paper or double-sided coating. Obtained as an anti-vibration sheet of elastomeric bituminous composition covered with paper However, double-sided adhesive paper facilitates the adhesion of the composite to the metal structure to be vibration-isolated. , this is because the bitumen/elastomer polymer mixture is sticky by itself. Not required. Furthermore, the release paper is made of thermoplastic material such as polyethylene film. It can also be replaced by a adhesive film, which reduces the buildup of the material by eliminating tackiness. Facilitates layering and peeling.

The following examples demonstrate the performance of mechanical properties over a wide temperature range of compositions according to the invention. Improvements, such as using the same polymer but using bitumen that does not have a high penetration index. A comparison is shown with a tumene/polymer mixture.

A mixture with an ene/styrene block copolymer was prepared.

HPI bitumen is made from the residue obtained by atmospheric distillation of crude oil and this crude oil. A 50:50 mixture with the residue obtained by vacuum distillation with a volume of tskg into the blowing tower at a temperature of 240° C. and into the blowing tower every hour! In the amount of 110j By injecting air for 3 hours and 10 minutes, 2.5 to 3 By oxidizing said mixture in the presence of an acid catalyst of the orthophosphoric acid type in an amount of % by weight Created. The penetration of the residue mixture before oxidation is approximately 400x at 25°C. It was 1/10 mm.

After oxidation, at 25°C with a penetration of 190x 1/10 mm and a softening point of 57°C. A bitumen with a high penetration index was obtained. Various penetration values of this bitumen The penetration index of bitumen was found to be +1.6 when measured at a temperature of is a characteristic of bitumen that has low sensitivity to temperature changes.

The thus obtained bitumen with a high penetration index was heated to 200°C with styrene/ Mixed with butadiene/styrene block copolymer at a ratio of 92:8 for 2 hours. did.

The styrene/butadiene/styrene block copolymer used was one shell hymie. (TR1184) and has the following properties: Styrene:butadiene weight ratio 70:30 Density 0.94 Flow rate rGJ Q/10m1n, 5k at 200℃ 1 (ASTM D 1238-65T) Viscosity of 25% solution in toluene 20,0OOCp (sen Chipoise) 30’C hardness (shore) 75 breakage resistance N/Cm22 70 Breaking elongation% (For the film obtained at 820 after evaporating the solution of the polymer in toluene) measurement) The final bitumen/polymer composition has a softening point of 125°C and 60x 1/10 It had a penetration depth of mm.

This final bitumen/polymer composition is then deposited to a thickness of 1 m, which will become the structure to be damped. The thickness of the bitumen/@combined viscoelastic composition is 1.5 mm for a steel plate of m. The stress coating was formed by casting as described above. Next, a steel stress layer with a thickness of 0.6 mm was applied. The composite was completed by adhering to the viscoelastic layer.

test For viscoelastic bitumen/polymer mixtures and composites formed as described above: A test was conducted.

The viscoelastic mixture was subjected to heat and cold resistance tests.

a. Heat resistance is measured on a flat surface inclined at 45° in an oven heated to 100°C. It is shown by measuring the flow of a 40x40x4mm test piece attached to the surface.

b. Cold resistance is measured using a 20mm x 100mm x 2mm test piece in a cold room. Flexibility is measured and shown.

The stiffness E1 and the loss angle tgδ of the C0 viscoelastic mixture are the same at three different temperatures. Measured by frequency.

d, Attenuation coefficient η of the composite formed as above was measured at three different temperatures.

The following results were obtained.

a, Flow at ioo°C = 2 strokes in 24 hours.

Limit of flexibility of b1 polymer/bitumen mixture = -25°C.

Viscoelastic properties of polymer/bitumen mixtures at C, f=62.5H7.

The damping coefficient of the composite at d, f = 42.5 Hz These results indicate that the stiffness of the composition It is shown that the loss angle and damping coefficient of the composite as well as the loss angle and damping coefficient of the composite change very little with temperature. are doing.

Comparative example Conventional bitumen and styrene/butadiene/styrene block copolymer (implemented) The same mixture as used in Example 1) was prepared. The directly distilled bitumen used was 2 It has a penetration of 1B8X 1/10 mm at 5°C and a softening point of 36°C, and the needle The input index was -1.1. This bitumen was heated to 200°C with styrene/butadiene. ene/styrene block copolymer at a ratio of 86:14 for 2 hours.

The final bitumen/polymer composition has a softening point of 125°C and 70X 1/10mm It had a penetration degree of .

The bitumen/polymer composition is applied onto a 1 mm thick steel plate which will become the structure to be vibration-isolated. Casting the viscoelastic composition of vinimen/polymer to a thickness of 1.5 mm A stress coating was formed by this. Next, the steel stress layer with a thickness of 0.6 mm was The composite was completed by adhering to the elastic layer.

Tests (a), (b), (c) conducted on the composition of the present invention in Example 1 above. ) and (d>, compared to viscoelastic bitumen/polymer mixtures and formed therefrom. This was also done for the complex.

The following results were obtained: a, flow at 100 °C = 80 mm 0b0 polymer/bitume in 24 hours Limit of flexibility of the polymer mixture = -25 ° C0c, f = 62.5 H2 / Viscoelastic properties of bituminous mixtures Damping coefficient of the composite at d, f = 62.5 Hz The stiffness modulus of the composition increases as the temperature increases. It decreased rapidly as the temperature increased, and the vibration isolation of the composite became insufficient under cold conditions.

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Claims (16)

[Claims] Bitumen with a high penetration index of 1.70 to 95% by weight (the value of this index is +1 to + 7) and 5 to 30% by weight of an elastomer polymer. Elastomeric bituminous composition with anti-dynamic properties. 2. Bitumen has a penetration of 100 to 250 x 1/10 mm at 25°C Elastomeric bituminous composition according to claim 1, characterized in that: 3. Bitumen has a penetration of 140 to 200 x 1/10 mm at 25°C Elastomeric bitumen according to claim 1 or 2, characterized in that composition. 4. Bitumen is the residue obtained from the atmospheric distillation of crude oil or the reduced pressure of crude oil. that can be obtained by oxidizing the distillation residue or a mixture of these two in the presence of a catalyst. The elastomeric bitch according to any one of claims 1 to 3 characterized in -men composition. 5. Claim 4, wherein the catalyst is acidic and contains phosphorus. Elastomeric bituminous composition. 6. The catalyst is of the orthophosphoric acid type and is greater than 2.5% by weight based on the total amount of residue. Elastomeric bitumen according to claim 5, characterized in that it is present in an amount of composition. 7. characterized in that the elastomer polymer consists of an elastomer block copolymer Elastomeric bituminous composition according to any one of claims 1 to 6. thing. 8. Elastomer block made of styrene and conjugated diene The elastomeric bitue according to claim 7, characterized in that it is a copolymer. men composition. 9. The elastomer polymer is a styrene/butadiene/styrene block copolymer. 9. Elastomeric bituminous composition according to claim 8. 10. The composition is characterized by containing a small amount of filler by weight to improve the stiffness modulus The elastomeric bitumen according to any one of claims 1 to 9. Composition. 11. Claims characterized in that the filler contains a layered filler and a spherical filler. 11. Elastomeric bituminous composition according to clause 10. 12. The polymer is applied to high penetration index bitumen at a temperature in the range of 180-250°C. Claims 1 to 11 characterized in that the method is dissolved or dispersed. A method for producing any of the compositions. 13. The elastomeric bitue according to any one of claims 1 to 11. A metal structure bonded with a metal composition. 14. Composition according to any one of claims 1 to 11 in stress coating use of things. 15. The elastomeric bitue according to any one of claims 1 to 11. Stress layer with bonded men composition. 16. A layer made of the composition according to any one of claims 1 to 11. A structure that is interposed between two elastic layers.