阅读说明：本技术 汽车排水管用吸音减震弹性体及其制备方法 (Sound-absorbing and shock-absorbing elastomer for automobile drain pipe and preparation method thereof ) 是由 夏玉洁 曹春林 王江玉 吴章柱 黄慧 于 2020-06-24 设计创作，主要内容包括：本发明公开了一种汽车排水管用吸音减震弹性体及其制备方法,该制备方法中通过在氢化苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物中添加乙烯基-聚二烯-苯乙烯嵌段共聚物、氢化苯乙烯-丁二烯共聚物、氢化苯乙烯-丁二烯嵌段共聚物中的一种或几种,使制得的高吸音减震热塑性弹性体共混物在损耗因子峰值时的温度接近室温,在室温条件下受到外力作用,由于分子运动摩擦需要大的能量,动能被转化为热能消耗了,能量没有传输,起到了消音减震作用；该制备方法通过使用物料混合装置将该吸音减震弹性体的原料进行混合,促使各组分之间相互融合,使得用该吸音减震弹性体制得的汽车排水管品质高,使用寿命长。(The invention discloses a sound-absorbing shock-absorbing elastomer for an automobile drain pipe and a preparation method thereof, wherein one or more of a vinyl-polydiene-styrene block copolymer, a hydrogenated styrene-butadiene copolymer and a hydrogenated styrene-butadiene block copolymer are added into a hydrogenated styrene-ethylene-butadiene-styrene block copolymer in the preparation method, so that the temperature of the prepared high sound-absorbing shock-absorbing thermoplastic elastomer blend at the peak value of a loss factor is close to room temperature, and the blend is subjected to the action of external force under the room temperature condition; according to the preparation method, the raw materials of the sound-absorbing damping elastomer are mixed by using the material mixing device, so that the components are fused with each other, and the automobile drain pipe prepared from the sound-absorbing damping elastomer is high in quality and long in service life.)

1. The sound-absorbing damping elastomer for the automobile drain pipe is characterized by comprising the following raw materials in parts by weight:

styrene-based thermoplastic elastomer a: 8-12 parts of styrene thermoplastic elastomer B: 60-80 parts of plasticizer: 40-50 parts of thermoplastic polyester elastomer: 10-16 parts of linear low-density polyethylene: 10-18 parts of polypropylene: 12-20 parts of a compatilizer: 6-10 parts of calcium carbonate: 20-40 parts of antioxidant: 0.2-1.0 part;

the sound-absorbing damping elastomer for the automobile drain pipe is prepared by the following steps:

step one, weighing the raw materials according to the weight;

step two, adding the styrene thermoplastic elastomer A and the plasticizer into a material mixing device for blending, and then adding the rest raw materials into the material mixing device one by one for uniformly mixing to form a mixture;

and step three, pouring the mixture into a double-screw extruder, and performing extrusion molding to obtain the sound-absorbing damping elastomer for the automobile drain pipe.

2. The sound-absorbing and vibration-damping elastomer for automobile drains according to claim 1, wherein the styrenic thermoplastic elastomer a is a hydrogenated styrene-ethylene-butadiene-styrene block copolymer, and the hydrogenated styrene-ethylene-butadiene-styrene block copolymer has a molecular weight of more than 15 ten thousand; the styrene thermoplastic elastomer B is one or more of a vinyl-polydiene-styrene block copolymer, a hydrogenated styrene-butadiene copolymer and a hydrogenated styrene-butadiene block copolymer.

3. The sound-absorbing and vibration-damping elastomer for the drainage pipe of the automobile as claimed in claim 1, wherein the plasticizer is a naphthenic rubber oil or a paraffinic oil, and the viscosity of the plasticizer is greater than 90cps at a temperature of 40 ℃; the hardness of the thermoplastic polyester elastomer is 25-35D; the compatilizer is SEBS grafted maleic anhydride or SBS grafted maleic anhydride.

4. The sound-absorbing and shock-absorbing elastomer for the automobile drain pipe as claimed in claim 1, wherein the temperature of the feeding section in the twin-screw extruder is 170-.

5. The preparation method of the sound-absorbing shock-absorbing elastomer for the automobile drain pipe is characterized by comprising the following steps of:

the method comprises the following steps: weighing the raw materials in parts by mass;

step two: firstly, adding a styrene thermoplastic elastomer A and a plasticizer into an inner cavity of a mixing bin (109) from a feeding pipe (107) of a material mixing device, driving a plurality of stirring mechanisms (115) to rotate by a rotating main shaft (114), uniformly mixing the styrene thermoplastic elastomer A and the plasticizer, then adding the rest raw materials into the inner cavity of the mixing bin (109) from the feeding pipe (107) one by one, uniformly mixing all the raw materials under the stirring action of the plurality of stirring mechanisms (115) to form a mixture, and discharging and collecting the mixture from a discharging pipe (110);

step three: and pouring the collected mixture into a double-screw extruder, and performing extrusion molding to obtain the sound-absorbing and shock-absorbing elastomer for the automobile drain pipe.

6. The method for preparing the sound-absorbing shock-absorbing elastomer for the automobile drain pipe according to claim 5, wherein the mixing process of the material mixing device in the second step is as follows:

the method comprises the following steps: starting a driving motor (103), wherein the driving motor (103) runs to drive a driving belt pulley (111) to rotate, and a driven belt pulley (112) is driven to rotate through a belt, so that a rotating main shaft (114) is driven to rotate;

step two: firstly, adding a styrene thermoplastic elastomer A and a plasticizer into an inner cavity of a mixing bin (109) from a feeding pipe (107), driving a plurality of stirring mechanisms (115) to rotate by a rotating main shaft (114), uniformly mixing the styrene thermoplastic elastomer A and the plasticizer, and then adding the rest raw materials into the inner cavity of the mixing bin (109) from the feeding pipe (107) one by one;

step three: all raw materials are uniformly mixed under the stirring action of a plurality of stirring mechanisms (115) to form a mixture, and the mixture is conveyed to the end part of the inner cavity of the mixing bin (109) under the action of the stirring blade (121) due to the included angle between the stirring blade (121) and the rotating main shaft (114) and is discharged and collected from the discharge pipe (110).

Technical Field

The invention relates to the technical field of production of automobile drain pipes, in particular to a sound-absorbing shock-absorbing elastomer for an automobile drain pipe and a preparation method thereof.

Background

In a vehicle body, a vehicle-mounted air conditioner is an essential part, while the production process of the existing vehicle-mounted air conditioner drain pipe usually adopts a thermoplastic elastomer as a raw material, the thermoplastic elastomer is also called as artificial rubber or synthetic rubber, and the product has the excellent performances of high elasticity, aging resistance and oil resistance of the traditional cross-linked vulcanized rubber, and has the characteristics of convenient processing and wide processing mode of common plastics; the thermoplastic elastomer can be produced by processing modes such as injection molding, extrusion, blow molding and the like, so that the processing process is simplified, and the processing cost is reduced, therefore, the thermoplastic elastomer becomes the latest material for replacing the traditional rubber, is environment-friendly, nontoxic, comfortable in hand feeling and exquisite in appearance, and makes the product more creative. Therefore, the material is a novel synthetic material with more humanization and high grade, and is also a worldwide standard environment-friendly material.

But current car drain pipe inhales the sound shock attenuation effect poor, and the noise is big during the drainage, easily spreads into the automobile body inside, causes noise pollution to the passenger, and during the raw materials elastomer production of car drain pipe, the mixture is not enough even between each raw materials moreover, and compatibility is poor between the raw materials, influences the quality of the car drain pipe of production, leads to car drain pipe life low.

Therefore, how to improve the problems that the existing automobile drain pipe has poor sound absorption and shock absorption effects and short service life is the problem to be solved by the invention.

Disclosure of Invention

In order to overcome the technical problems, the invention aims to provide a sound-absorbing shock-absorbing elastomer for an automobile drain pipe and a preparation method thereof, wherein the sound-absorbing shock-absorbing elastomer comprises the following steps: (1) one or more of vinyl-polydiene-styrene block copolymer, hydrogenated styrene-butadiene copolymer and hydrogenated styrene-butadiene block copolymer are added into the hydrogenated styrene-ethylene-butadiene-styrene block copolymer, so that the temperature of the prepared high sound-absorption shock-absorption thermoplastic elastomer blend at the loss factor peak value is close to room temperature, and the blend is acted by external force under the room temperature condition; (2) mix this raw materials of inhaling sound shock attenuation elastomer through using material mixing device, it rotates to drive driving pulley through the driving motor operation, it rotates to drive driven pulley through the belt, thereby it rotates to have driven the rotation main shaft, add styrene series thermoplastic elastomer A and plasticizer from the inlet pipe to the inner chamber of blending bunker earlier, the pivoted rotates the main shaft and drives a plurality of rabbling mechanism and rotate, thermoplastic elastomer A and plasticizer misce bene with styrene series, then add remaining raw materials from the inlet pipe to the inner chamber of blending bunker one by one, all raw materials misce bene under a plurality of rabbling mechanism's stirring effect, the problem that current car drain pipe life is low has been solved.

The purpose of the invention can be realized by the following technical scheme:

the sound-absorbing damping elastomer for the automobile drain pipe comprises the following raw materials in parts by weight:

styrene-based thermoplastic elastomer a: 8-12 parts of styrene thermoplastic elastomer B: 60-80 parts of plasticizer: 40-50 parts of thermoplastic polyester elastomer: 10-16 parts of linear low-density polyethylene: 10-18 parts of polypropylene: 12-20 parts of a compatilizer: 6-10 parts of calcium carbonate: 20-40 parts of antioxidant: 0.2-1.0 part;

the sound-absorbing damping elastomer for the automobile drain pipe is prepared by the following steps:

step one, weighing the raw materials according to the weight;

step two, adding the styrene thermoplastic elastomer A and the plasticizer into a material mixing device for blending, and then adding the rest raw materials into the material mixing device one by one for uniformly mixing to form a mixture;

and step three, pouring the mixture into a double-screw extruder, and performing extrusion molding to obtain the sound-absorbing damping elastomer for the automobile drain pipe.

As a further scheme of the invention: the styrene thermoplastic elastomer A is a hydrogenated styrene-ethylene-butadiene-styrene block copolymer, and the molecular weight of the hydrogenated styrene-ethylene-butadiene-styrene block copolymer is more than 15 ten thousand; the styrene thermoplastic elastomer B is one or more of a vinyl-polydiene-styrene block copolymer, a hydrogenated styrene-butadiene copolymer and a hydrogenated styrene-butadiene block copolymer.

As a further scheme of the invention: the plasticizer is naphthenic rubber oil or paraffin oil, and the viscosity of the plasticizer is more than 90cps at the temperature of 40 ℃; the hardness of the thermoplastic polyester elastomer is 25-35D; the compatilizer is SEBS grafted maleic anhydride or SBS grafted maleic anhydride.

As a further scheme of the invention: the temperature of the feeding section in the double-screw extruder is 170-190 ℃, the temperature of the compression section is 200-220 ℃, the temperature of the metering section is 190-210 ℃, the temperature of the die head is 180-200 ℃, and the screw rotating speed is 260-320 rpm.

As a further scheme of the invention: the preparation method of the sound-absorbing shock-absorbing elastomer for the automobile drain pipe comprises the following steps:

the method comprises the following steps: weighing the raw materials in parts by mass;

step two: firstly, adding a styrene thermoplastic elastomer A and a plasticizer into an inner cavity of a mixing bin from a feeding pipe of a material mixing device, driving a plurality of stirring mechanisms to rotate by a rotating main shaft, uniformly mixing the styrene thermoplastic elastomer A and the plasticizer, then adding the rest raw materials into the inner cavity of the mixing bin from the feeding pipe one by one, uniformly mixing all the raw materials under the stirring action of the plurality of stirring mechanisms to form a mixture, and discharging and collecting the mixture from a discharging pipe;

step three: and pouring the collected mixture into a double-screw extruder, and performing extrusion molding to obtain the sound-absorbing and shock-absorbing elastomer for the automobile drain pipe.

As a further scheme of the invention: the material mixing process of the material mixing device in the second step is as follows:

the method comprises the following steps: starting a driving motor, driving a driving belt pulley to rotate by the operation of the driving motor, and driving a driven belt pulley to rotate by a belt, so that a rotating main shaft is driven to rotate;

step two: adding a styrene thermoplastic elastomer A and a plasticizer into an inner cavity of a mixing bin from a feeding pipe, driving a plurality of stirring mechanisms to rotate by a rotating main shaft, uniformly mixing the styrene thermoplastic elastomer A and the plasticizer, and then adding the rest raw materials into the inner cavity of the mixing bin from the feeding pipe one by one;

step three: all raw materials are uniformly mixed under the stirring action of a plurality of stirring mechanisms to form a mixture, and the mixture is conveyed to the end part of the inner cavity of the mixing bin under the action of the stirring blade due to the included angle between the stirring blade and the rotating main shaft and is discharged and collected from the discharge pipe.

The invention has the beneficial effects that:

(1) according to the preparation method of the sound-absorbing and shock-absorbing elastomer for the automobile drain pipe, one or more of the vinyl-polydiene-styrene block copolymer, the hydrogenated styrene-butadiene copolymer and the hydrogenated styrene-butadiene block copolymer are added into the hydrogenated styrene-ethylene-butadiene-styrene block copolymer, so that the temperature of the prepared high sound-absorbing and shock-absorbing thermoplastic elastomer blend is close to room temperature when the loss factor is at the peak value, the blend is subjected to the action of external force under the condition of room temperature, and because molecular motion friction needs large energy, kinetic energy is converted into heat energy to be consumed, the energy is not transmitted, and the sound-absorbing and shock-absorbing effects are achieved; the thermoplastic polyester elastomer mainly improves the deflection elasticity of the material, and can improve temperature resistance and solubility resistance; the compatilizer can improve the compatibility of the thermoplastic polyester elastomer with other materials; the elastomer has good sound absorption and shock absorption effects, good heat resistance and solubility resistance, improved deflection elasticity, simple production process and good processability;

carry out the performance detection to this sound absorption shock attenuation elastomer for car drain pipe, the testing result: the hardness (A) is 65-70, and the density is 0.98-0.99g/cm³The tensile strength is 7.8-8.1MPa, the elongation at break is 560-600%, the glass transition temperature is 12-23 ℃, and the loss factor (Max) is 2.1-2.8;

(2) the invention relates to a preparation method of a sound-absorbing shock-absorbing elastomer for an automobile drain pipe, which comprises the steps of mixing raw materials of the sound-absorbing shock-absorbing elastomer by using a material mixing device, driving a driving belt pulley to rotate by operating a driving motor, driving a driven belt pulley to rotate by a belt, and driving a rotating main shaft to rotate; this material mixing arrangement drives the rabbling mechanism rotation high-speed rotation of a plurality of dislocation installation through rotatory rotation main shaft, with each raw materials misce bene, impels to fuse each other between each component for the automobile drain pipe quality that makes with this sound absorption damping elastomer is high, long service life.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of a material mixing apparatus according to the present invention;

FIG. 2 is a schematic view showing the internal structure of the power case of the present invention;

FIG. 3 is a schematic view of the internal structure of the mixing silo of the present invention;

FIG. 4 is a front view of the rotating spindle, stirring mechanism of the present invention;

FIG. 5 is a schematic view of the structure of the stirring mechanism of the present invention.

In the figure: 101. supporting a vertical plate; 102. supporting the transverse plate; 103. a drive motor; 104. a fixing plate; 105. a power box; 106. mounting a plate; 107. a feed pipe; 108. a reinforcing plate; 109. a mixing bin; 110. a discharge pipe; 111. a drive pulley; 112. a driven pulley; 113. a bearing seat; 114. rotating the main shaft; 115. a stirring mechanism; 116. mounting holes; 117. a stud; 118. fastening a nut; 119. installing a sleeve; 120. a connecting plate; 121. and a stirring blade.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.