阅读说明：本技术 一种隔音聚乙烯醇缩醛树脂及其制备方法与用途 (Sound-insulation polyvinyl acetal resin and preparation method and application thereof ) 是由 袁港 喻永连 谢昭亮 徐康林 于 2021-10-27 设计创作，主要内容包括：本发明公开了式(Ⅰ)所示的隔音聚乙烯醇缩醛树脂及其制备方法,该化合物的制备方法是：将聚乙烯醇和水加入到溶解釜中,升温至90℃～98℃,搅拌溶解,再降温至35℃～45℃,投入长链脂肪醛、抗氧剂,制得聚乙烯醇/长链脂肪醛混合溶液；再与盐酸水溶液同时分别通过各自的管路连续进入具有加热和冷却功能的管式反应器中反应,然后将全部物料转至老化釜中反应,再补加盐酸水溶液,升温至55℃～65℃反应后；再加入氢氧化钠水溶液使反应液pH=10,然后用水洗涤,烘干,即制得隔音聚乙烯醇缩醛树脂。本发明制备的隔音聚乙烯醇缩醛树脂具有粘度高、力学性能好等优点；用于制备三层隔音PVB胶片,具有良好隔音性能。 (Ⅰ)。(The invention discloses a sound-insulating polyvinyl acetal resin shown in formula (I) and a preparation method thereof, wherein the preparation method of the compound comprises the following steps: adding polyvinyl alcohol and water into a dissolving kettle, heating to 90-98 ℃, stirring for dissolving, cooling to 35-45 ℃, and adding long-chain aliphatic aldehyde and an antioxidant to prepare a polyvinyl alcohol/long-chain aliphatic aldehyde mixed solution; continuously feeding the mixture and hydrochloric acid aqueous solution into a tubular reactor with heating and cooling functions through respective pipelines to react, transferring all the materials into an aging kettle to react, supplementing the hydrochloric acid aqueous solution, and heating to 55-65 ℃ to react; adding sodium hydroxide aqueous solution to make reaction solution pH =10, washing with water, and oven drying to obtain the final productA sound-insulating polyvinyl acetal resin. The sound-insulation polyvinyl acetal resin prepared by the invention has the advantages of high viscosity, good mechanical property and the like; the three-layer sound insulation PVB film is used for preparing the three-layer sound insulation PVB film and has good sound insulation performance.)

1. A sound-insulating polyvinyl acetal resin characterized by: the compound has a chemical structural formula shown in (I):

in formula (I): x 550-620, y 440-500, and z 3-24;

the chemical structural formula of R is:

in the formula: m is 6, 7, 8, 9, 10, 11 or 12.

2. A preparation method of sound-insulating polyvinyl acetal resin is characterized by comprising the following steps:

a. preparing a polyvinyl alcohol/long-chain aliphatic aldehyde mixed solution:

adding 100 parts by mass of polyvinyl alcohol and 670-1330 parts by mass of deionized water into a dissolving kettle at normal temperature, heating to 90-98 ℃, stirring and dissolving to obtain a polyvinyl alcohol aqueous solution, filtering, cooling to 35-45 ℃, adding 60-75 parts by mass of long-chain aliphatic aldehyde and 0.4-0.8 part by mass of antioxidant, and stirring for 10-40 min to obtain a polyvinyl alcohol/long-chain aliphatic aldehyde mixed solution;

b. preparation of sound-insulating polyvinyl acetal resin:

mixing the polyvinyl alcohol/long-chain fatty aldehyde mixed solution prepared in the step a with a hydrochloric acid aqueous solution with the mass percentage concentration of 0.5% -1.5%, and stirring the mixed solution and the hydrochloric acid aqueous solution according to the volume ratio of 100: 15-25, continuously feeding the materials into a tubular reactor with heating and cooling functions through respective pipelines within 6-10 min, reacting for 10-20 min, transferring all the materials into an aging kettle with a stirring speed of 70-100 r/min and an initial temperature of 30-40 ℃, supplementing 5-10 parts by mass of a 20-30% hydrochloric acid aqueous solution after reacting for 1h, simultaneously heating to 55-65 ℃ at a heating rate of 1 ℃/4min, and finishing the reaction after reacting for 1-2 h; and adding an aqueous solution of sodium hydroxide to adjust the pH of the reaction solution to 10, washing the reaction solution with deionized water, and drying the reaction solution to obtain the sound-insulating polyvinyl acetal resin.

3. The method for preparing a sound-insulating polyvinyl acetal resin according to claim 2, wherein: the long-chain aliphatic aldehyde in the step a is any one of octanal, nonanal, decanal, undecanal, dodecanal, tridecanal and tetradecanal.

4. A method for producing a sound-insulating polyvinyl acetal resin according to claim 2 or 3, which comprises: the antioxidant in the step a can be one or two of antioxidant 1076, antioxidant 1010 and antioxidant 168.

5. The sound-insulating polyvinyl acetal resin according to claim 1, wherein: the sound-insulating polyvinyl acetal resin is used for preparing a PVB film with sound-insulating property.

6. The sound-insulating polyvinyl acetal resin according to claim 5, wherein: the sound-insulating polyvinyl acetal resin is used for preparing a PVB film with sound-insulating property, and the specific preparation method comprises the following steps: compounding the upper layer, the middle layer and the lower layer to obtain the PVB film with sound insulation performance;

the thickness of the upper layer and the thickness of the lower layer are both 0.2-0.6 mm, and the upper layer and the lower layer are both composed of 70-80% of PVB resin for common films and 20-30% of plasticizer by mass percentage;

the thickness of the middle layer is 0.1-0.2 mm, and the middle layer is composed of 50-70% of sound insulation polyvinyl acetal resin and 30-50% of plasticizer by mass percentage.

7. The sound-insulating polyvinyl acetal resin according to claim 6, wherein: the plasticizer is one or a mixture of more than two of plasticizer 3G8, plasticizer 4G7, di-n-hexyl adipate and dioctyl adipate.

8. The sound-insulating polyvinyl acetal resin according to claim 6 or 7, which is characterized in that: the PVB resin for the common membrane is PVB resin with the viscosity of 1000-1300mPa & s and the hydroxyl value of 17-21%.

Technical Field

The invention belongs to an organic high molecular compound and preparation and application thereof, and relates to a sound-insulating polyvinyl acetal resin and a preparation method and application thereof. The sound-insulating polyvinyl acetal resin (prepared) is particularly suitable for being used as sound-insulating PVB resin in the field of sound-insulating polyvinyl butyral (PVB) resin films.

Background

Polyvinyl Butyral (PVB) resin is formed by polycondensation reaction of high molecular Polyvinyl alcohol and butyraldehyde, a certain proportion of vinyl alcohol groups are also contained in a final polymer, after plasticizing is carried out by adding a plasticizer into the PVB resin, a semitransparent PVB membrane can be continuously produced by using a precise thickness control system and adopting a tape casting extrusion mode, wherein the PVB membrane is called Polyvinyl butyl Interlayer in English, is abbreviated as PVB membrane, and is also called PVB film or PVB intermediate film.

The PVB membrane is mainly used for laminated safety glass, namely a layer of PVB membrane is sandwiched between two pieces of glass. Due to the good adhesion of PVB to inorganic materials, PVB laminated glass does not break even after being subjected to strong external force, but cracks are generated and continuously attached to the PVB film. Therefore, the PVB laminated glass can be used as safety glass and bulletproof glass and has the functions of safety, heat insulation, sound insulation, ultraviolet protection, energy conservation and the like. The PVB resin is mainly used as an interlayer material of automobile windshields and building safety glass; also used in the production fields of ceramic patterns, adhesives, textile sizing, paper surface coating, solar cells and photovoltaic cells.

The rapid development of modern automobiles brings modern material civilization to the world, but also brings problems of noise pollution and the like. When the automobile is in the high-decibel noise environment for a long time, the automobile is easy to cause fatigue of a driver, driving danger is caused, and physical diseases are easy to induce. Therefore, the noise of the automobile is reduced, a quiet and comfortable environment in the automobile is established, and the automobile noise reducing device is an urgent need for vast automobile enthusiasts and automobile owners.

In the past, people usually use solid or greatly increase the thickness of glass to improve the sound insulation performance of the glass, however, with the increasing attention of people to environmental problems, the limitation of glass design, the limitation of increasing the thickness and the hardness, and the 'green environmental protection' also becomes the first problem facing automobile and building manufacturers, wherein the weight reduction of automobiles is increased to be an important consideration in automobile design. Therefore, how to reduce noise that can be transmitted by engine noise, road traffic noise, unpleasant wind noise, and the like is a significant issue.

The PVB (polyvinyl butyral) laminated glass has higher safety performance and is widely applied to the fields of buildings and automobiles. With the increasing requirements of people on living quality, noise pollution becomes a problem which needs to be solved urgently. The PVB laminated glass industry has been actively exploring the development of sound-insulating materials in recent years, and in the prior art, sound insulation has been mainly achieved by using multiple layers of PVB interlayer, such as "a three-layer PVB film having sound-insulating properties and a method for preparing the same" disclosed in CN107323056A, wherein the interlayer mainly plays a role in sound insulation. In order to realize sound insulation performance, the PVB resin is increased in butyraldehyde group content, the hydroxyl value of the PVB resin is reduced, and the absorption capacity of a plasticizer is increased. However, this method has several disadvantages: (1) the reduction of the hydroxyl value of the PVB resin can reduce the mechanical property of the PVB resin, so that certain influence is caused on the safety and the processing performance of the membrane; (2) the anti-aging performance of the film is reduced; (3) the plasticizer is separated out and migrates toward the outer layer, thereby deteriorating the sound-insulating property and the safety property. Therefore, how to improve the sound insulation performance of the film on the basis of ensuring the safety performance is still a research hotspot.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a sound-insulating polyvinyl acetal resin and a preparation method and application thereof. Thereby providing a sound-insulating polyvinyl acetal resin capable of preparing a PVB film with good sound-insulating performance and the like and a preparation method thereof.

The content of the invention is as follows: a sound-insulating polyvinyl acetal resin characterized by: the compound has a chemical structural formula shown in (I):

in formula (I): x 550-620, y 440-500, and z 3-24;

the chemical structural formula of R is:

in the formula: m is 6, 7, 8, 9, 10, 11 or 12.

The physical and chemical data of the sound-insulating polyvinyl acetal (resin) are as follows: the viscosity is 1500-2000 mPas, the hydroxyl content is 18-21%, the glass transition temperature is 65-75 ℃, and the product is white powder.

Another aspect of the invention is: a preparation method of sound-insulating polyvinyl acetal resin is characterized by comprising the following steps:

a. preparing a polyvinyl alcohol/long-chain aliphatic aldehyde mixed solution:

adding 100 parts by mass of polyvinyl alcohol and 670-1330 parts by mass of deionized water into a dissolving kettle at normal temperature, heating to 90-98 ℃, stirring (completely) to dissolve the polyvinyl alcohol into a polyvinyl alcohol aqueous solution, filtering (removing solid impurities), cooling to 35-45 ℃, adding 60-75 parts by mass of long-chain fatty aldehyde and 0.4-0.8 part by mass of antioxidant, and stirring at high speed for 10-40 min to prepare a (uniform) polyvinyl alcohol/long-chain fatty aldehyde mixed solution;

b. preparation of sound-insulating polyvinyl acetal resin:

mixing the polyvinyl alcohol/long-chain fatty aldehyde mixed solution prepared in the step a with a hydrochloric acid aqueous solution with the mass percentage concentration of 0.5% -1.5%, and stirring the mixed solution and the hydrochloric acid aqueous solution according to the volume ratio of 100: 15-25, continuously feeding the materials into a tubular reactor with heating and cooling functions through respective pipelines within 6-10 min, reacting for 10-20 min, transferring all the materials into an aging kettle with a stirring speed of 70-100 r/min and an initial temperature of 30-40 ℃, supplementing 5-10 parts by mass of a hydrochloric acid aqueous solution with a mass percentage concentration of 20-30% after reacting for 1h, simultaneously heating to 55-65 ℃ at a heating rate of 1 ℃/4min, and finishing the reaction after 1-2 h; then, an appropriate amount of aqueous sodium hydroxide solution was added to adjust the reaction solution to pH 10, and the resulting mixture was washed with deionized water, centrifuged, and dried to obtain (white powder) sound-insulating polyvinyl acetal resin (also referred to as "new polyvinyl acetal resin").

In another aspect of the invention: the long-chain aliphatic aldehyde in the step a can be any one of octanal, nonanal, decanal, undecanal, dodecanal, tridecanal, and tetradecanal.

In the step a, the polyvinyl alcohol (PVA for short) is polyvinyl alcohol with the polymerization degree of 1700-2000 and the alcoholysis degree of 98-99% and is white solid powder, and the product production providing enterprises can be as follows: sichuan vinylon factories, Anhui Wei group Co., Ltd, Nemontage Douchin environmental protection materials Co., Ltd.

In another aspect of the invention: in the step a, the antioxidant can be one or two of antioxidant 1076, antioxidant 1010 and antioxidant 168, and the production provider of the antioxidant can be: basf, Tianjin Rianlong.

Another aspect of the invention is: use of a sound-insulating polyvinyl acetal resin, characterized in that: the sound-insulating polyvinyl acetal resin is used for preparing a PVB film with sound-insulating property.

The sound-insulating polyvinyl acetal resin is used for preparing a PVB film with sound-insulating property, and the specific preparation method comprises the following steps: compounding the upper layer, the middle layer and the lower layer to obtain the PVB film with sound insulation performance;

the thickness of the upper layer and the thickness of the lower layer are both 0.2-0.6 mm, and the upper layer and the lower layer are both composed of 70-80% of PVB resin for common films and 20-30% of plasticizer by mass percentage;

the thickness of the middle layer is 0.1-0.2 mm, and the middle layer is composed of 50-70% of sound insulation polyvinyl acetal resin and 30-50% of plasticizer by mass percentage.

The plasticizer is one or a mixture of more than two of plasticizer 3G8, plasticizer 4G7, di-n-hexyl adipate (DHA for short) and dioctyl adipate (DOA for short).

The PVB resin for the common membrane is PVB (PVB is polyvinyl butyral for short) resin with the viscosity of 1000-1300mPa & s and the hydroxyl value of 17-21%.

Compared with the prior art, the invention has the following characteristics and beneficial effects:

(1) the invention adopts long-chain aliphatic aldehyde to modify polyvinyl alcohol, and the prepared sound-insulating polyvinyl acetal resin (or called novel polyvinyl acetal resin) has the advantages of high viscosity, good mechanical property and the like; the viscosity of PVB prepared from PVA is 1000-1300mPa.s, and the viscosity of the novel polyvinyl acetal is 1500-2300 mPa.s; the tensile strength of the common PVB prepared membrane is 20-30 MPa, and the tensile strength of the novel polyvinyl acetal prepared membrane is 25-35 MPa;

(2) compared with the common PVB resin, the prepared sound-insulating polyvinyl acetal resin (or called novel polyvinyl acetal resin) has the same sound-insulating effect, the hydroxyl value of the novel polyvinyl acetal is only 18-21%, and the hydroxyl value of the common PVB resin is generally reduced to 10-14%; the difficulty of the synthesis process is reduced; because the lower the hydroxyl value, the greater the difficulty of synthesis;

(3) the plasticizer absorption capacity of the sound-insulating polyvinyl acetal resin (or called novel polyvinyl acetal resin) prepared by the invention is obviously improved; common PVB resin generally absorbs 20-30% of plasticizer, and the plasticizer absorption proportion of the novel polyvinyl acetal is 40-50%;

(4) the three-layer sound-insulation PVB film prepared from the sound-insulation polyvinyl acetal resin can effectively obstruct noise pollution, can improve the sound-insulation effect by 5-7dB compared with the conventional PVB film in the noise sensitive range of 1000-4000 Hz of human ears, and has good sound-insulation performance;

(5) the product of the invention has simple preparation process, simple and convenient working procedure, easy operation and strong practicability.

Detailed Description

The following examples are intended to further illustrate the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims appended hereto.

The first part of the preparation of novel polyvinyl acetals

Examples 1 to 7:

a preparation method of sound-insulating polyvinyl acetal resin (or called novel polyvinyl acetal resin) comprises the following steps: adding 1000kg of polyvinyl alcohol and 10000kg of deionized water into a dissolving kettle at normal temperature, heating to 95 ℃, stirring to completely dissolve the polyvinyl alcohol into a polyvinyl alcohol aqueous solution, filtering, cooling to 40 ℃, adding a certain amount (the specific dosage is shown in table 1) of long-chain aliphatic aldehyde and 6kg of antioxidant 1010, and stirring at high speed for 30min to obtain a uniform polyvinyl alcohol/long-chain aliphatic aldehyde mixed solution; mixing the polyvinyl alcohol/long-chain fatty aldehyde mixed solution with a hydrochloric acid aqueous solution with the mass concentration of 1.0% at the temperature of 30 ℃ according to the volume ratio of 100: 20, continuously feeding the materials into a tubular reactor with heating and cooling functions through respective pipelines within 8min, reacting for 20min, transferring all the materials into an aging kettle with a stirring speed of 100r/min and an initial temperature of 30 ℃, reacting for 1h under the conditions, supplementing 94kg of 20% hydrochloric acid aqueous solution, simultaneously heating to 65 ℃ at a heating rate of 1 ℃/4min, and reacting for 2 h; adding a proper amount of sodium hydroxide solution to make the pH value of the reaction solution equal to 10, then washing the reaction solution by using deionized water, centrifuging and drying the reaction solution to obtain white powdery sound-insulating polyvinyl acetal resin (or called novel polyvinyl acetal resin).

Table 1 shows the amounts of long chain fatty aldehydes used in examples 1 to 7 and comparative example 1:

examples	Long chain fatty aldehydes	Dosage of
			1	Octanal	1030kg
2	Nonanal	1146kg
			3	Decanal	1259kg
4	Undecanal aldehyde	1370kg
			5	Dodecanal	1483kg
6	Tridecanal	1595kg
			7	Tetradecanal	1710kg
Comparative example 1	Butyraldehyde	580kg

Table 2 shows the technical indices of the soundproof polyvinyl acetal resins obtained in examples 1 to 7 and comparative example 1:

a second part: preparation of sound-insulation PVB film

Examples 8 to 14:

adding common PVB resin powder at the screw rotating speed of 700-900 RPM according to the 1100KG/H amount through an automatic feeding system with a weightlessness scaleIn a twin-screw extruder of the type described above, a plasticizer containing a UV agent (i.e., an ultraviolet absorber), an antioxidant, a pigment and the like was passed through the extruder at a rate of 400KG/HInjecting a liquid material injection port on a machine barrel of the double-screw extruder into the extruder, synchronously injecting a liquid material containing a binding power regulator into the extruder through another liquid material injection port, and the like, wherein the processing temperature is set to be between 90 and 170 ℃, and various materials are subjected to melt plasticization through double-screw shearing; in addition, 200KG of novel polyvinyl acetal resin powder is added through an automatic feeding system with a weightlessness scale at the screw rotating speed of 300RPM to 400RPM according to the 210KG/H amountIn a twin-screw extruder of the type, the plasticizer is passed through at the same time in an amount of 190KG/HInjecting liquid material injection ports on machine barrels of the double-screw extruder into the extruder, setting the processing temperature between 60 and 160 ℃, enabling the materials to be melted and plasticized through double-screw shearing, and finally converging resin plasticized by the two extruders through a T-shaped die with three layers of runners to form a sound insulation PVB membrane, wherein the sound insulation PVB membrane is formedThe organic matter is positioned in the middle layer,the material is placed on two side layers, and the membrane formed by the die is cooled and shaped by a water tank, annealed, trimmed and rolled into a roll-shaped finished product (namely the prepared sound insulation PVB film).

The following steps: the ordinary PVB resin is characterized by the viscosity of 1000-1300mPa.s and the hydroxyl value of 17-21%.

Table 3 shows that the novel polyvinyl acetal resins used in examples 8 to 14 and comparative example 2 are:

examples	Novel polyvinyl acetal resin
		8	Example 1
9	Example 2
		10	Example 3
11	Example 4
		12	Example 5
13	Example 6
		14	Example 7
Comparative example 2	Comparative example 1

Table 4 shows the technical specifications of the sound-damping PVB films prepared in examples 8-14 and comparative example 2:

example 15:

a sound-insulating polyvinyl acetal resin having a chemical formula shown in (I):

in formula (I): x 550-620, y 440-500, and z 3-24;

the chemical structural formula of R is:

in the formula: m is 6, 7, 8, 9, 10, 11 or 12.

The physical and chemical data of the sound-insulating polyvinyl acetal (resin) are as follows: the viscosity is 1500-2000 mPas, the hydroxyl content is 18-21%, the glass transition temperature is 65-75 ℃, and the product is white powder.

Example 16:

a preparation method of sound-insulating polyvinyl acetal resin comprises the following steps:

a. preparing a polyvinyl alcohol/long-chain aliphatic aldehyde mixed solution:

adding 100 parts by mass of polyvinyl alcohol and 670 parts by mass of deionized water into a dissolving kettle at normal temperature, heating to 90 ℃, stirring (completely) to dissolve the polyvinyl alcohol into a polyvinyl alcohol aqueous solution, filtering (removing solid impurities), cooling to 35 ℃, adding 60 parts by mass of long-chain fatty aldehyde and 0.4 part by mass of antioxidant, and stirring at high speed for 10min to prepare a (uniform) polyvinyl alcohol/long-chain fatty aldehyde mixed solution;

b. preparation of sound-insulating polyvinyl acetal resin:

mixing the polyvinyl alcohol/long-chain fatty aldehyde mixed solution prepared in the step a with a hydrochloric acid aqueous solution with the mass percentage concentration of 0.5% at the temperature of 30 ℃ according to the volume ratio of 100: 15, continuously feeding the materials into a tubular reactor with heating and cooling functions through respective pipelines within 6min, reacting for 10min, transferring all the materials into an aging kettle with a stirring speed of 70r/min and an initial temperature of 30 ℃, reacting for 1h, supplementing 5 parts by mass of a hydrochloric acid aqueous solution with a mass percentage concentration of 20%, heating to 55 ℃ at a heating rate of 1 ℃/4min, and reacting for 1 h; then, an appropriate amount of aqueous sodium hydroxide solution was added to adjust the reaction solution to pH 10, and the mixture was washed with deionized water, centrifuged, and dried to obtain (white powder) sound-insulating polyvinyl acetal resin.

Example 17:

a preparation method of sound-insulating polyvinyl acetal resin comprises the following steps:

a. preparing a polyvinyl alcohol/long-chain aliphatic aldehyde mixed solution:

adding 100 parts by mass of polyvinyl alcohol and 1330 parts by mass of deionized water into a dissolving kettle at normal temperature, heating to 98 ℃, stirring (completely) to dissolve the polyvinyl alcohol into a polyvinyl alcohol aqueous solution, filtering (removing solid impurities), cooling to 45 ℃, adding 75 parts by mass of long-chain fatty aldehyde and 0.8 part by mass of antioxidant, and stirring at high speed for 40min to prepare a (uniform) polyvinyl alcohol/long-chain fatty aldehyde mixed solution;

b. preparation of sound-insulating polyvinyl acetal resin:

mixing the polyvinyl alcohol/long-chain fatty aldehyde mixed solution prepared in the step a with a hydrochloric acid aqueous solution with the mass percentage concentration of 1.5%, and at the temperature of 30 ℃, according to the volume ratio of 100: 25, continuously feeding the materials into a tubular reactor with heating and cooling functions through respective pipelines within 10min, reacting for 20min, transferring all the materials into an aging kettle with a stirring speed of 100r/min and an initial temperature of 40 ℃, reacting for 1h, supplementing 10 parts by mass of a hydrochloric acid aqueous solution with a mass percentage concentration of 30%, heating to 65 ℃ at a heating rate of 1 ℃/4min, and reacting for 2 h; then, an appropriate amount of aqueous sodium hydroxide solution was added to adjust the reaction solution to pH 10, and the mixture was washed with deionized water, centrifuged, and dried to obtain (white powder) sound-insulating polyvinyl acetal resin.

Example 18:

a preparation method of sound-insulating polyvinyl acetal resin comprises the following steps:

a. preparing a polyvinyl alcohol/long-chain aliphatic aldehyde mixed solution:

adding 100 parts by mass of polyvinyl alcohol and 1000 parts by mass of deionized water into a dissolving kettle at normal temperature, heating to 94 ℃, stirring (completely) to dissolve the polyvinyl alcohol into a polyvinyl alcohol aqueous solution, filtering (removing solid impurities), cooling to 40 ℃, adding 68 parts by mass of long-chain fatty aldehyde and 0.6 part by mass of antioxidant, and stirring at high speed for 25min to prepare a (uniform) polyvinyl alcohol/long-chain fatty aldehyde mixed solution;

b. preparation of sound-insulating polyvinyl acetal resin:

mixing the polyvinyl alcohol/long-chain fatty aldehyde mixed solution prepared in the step a with a hydrochloric acid aqueous solution with the mass percentage concentration of 1% at the temperature of 30 ℃ according to the volume ratio of 100: 20, continuously feeding the materials into a tubular reactor with heating and cooling functions through respective pipelines within 8min, reacting for 15min, transferring all the materials into an aging kettle with a stirring speed of 85r/min and an initial temperature of 35 ℃, reacting for 1h, supplementing 7.5 parts by mass of 25% hydrochloric acid aqueous solution, heating to 60 ℃ at a heating rate of 1 ℃/4min, and reacting for 1.5 h; then, an appropriate amount of aqueous sodium hydroxide solution was added to adjust the reaction solution to pH 10, and the mixture was washed with deionized water, centrifuged, and dried to obtain (white powder) sound-insulating polyvinyl acetal resin.

In examples 16-18 above: the long-chain aliphatic aldehyde in the step a can be any one of octanal, nonanal, decanal, undecanal, dodecanal, tridecanal, and tetradecanal.

In examples 16-18 above: in the step a, the antioxidant can be one or two of antioxidant 1076, antioxidant 1010 and antioxidant 168, and the production provider of the antioxidant can be: basf and Tianjin Rianlong.

Example 19:

use of a sound-insulating polyvinyl acetal resin for the production of a PVB film having sound-insulating properties.

Example 20:

the sound-insulating polyvinyl acetal resin is used for preparing a PVB film with sound-insulating property, and the specific preparation method comprises the following steps: compounding the upper layer, the middle layer and the lower layer to obtain the PVB film with sound insulation performance;

the thicknesses of the upper layer and the lower layer are both 0.2mm, and the upper layer and the lower layer are both composed of 70 mass percent of PVB resin for common films and 30 mass percent of plasticizer;

the thickness of the middle layer is 0.1mm, and the middle layer consists of 70% of sound insulation polyvinyl acetal resin and 30% of plasticizer in percentage by mass.

Example 21:

the sound-insulating polyvinyl acetal resin is used for preparing a PVB film with sound-insulating property, and the specific preparation method comprises the following steps: compounding the upper layer, the middle layer and the lower layer to obtain the PVB film with sound insulation performance;

the thicknesses of the upper layer and the lower layer are both 0.6mm, and the upper layer and the lower layer are both composed of 80 mass percent of PVB resin for common films and 20 mass percent of plasticizer;

the thickness of the middle layer is 0.2mm, and the middle layer consists of 60% of sound insulation polyvinyl acetal resin and 40% of plasticizer in percentage by mass.

Example 22:

the sound-insulating polyvinyl acetal resin is used for preparing a PVB film with sound-insulating property, and the specific preparation method comprises the following steps: compounding the upper layer, the middle layer and the lower layer to obtain the PVB film with sound insulation performance;

the thicknesses of the upper layer and the lower layer are both 0.4mm, and the upper layer and the lower layer are both composed of 75% of PVB resin for common films and 25% of plasticizer by mass percentage;

the thickness of the intermediate layer is 0.15mm, and the intermediate layer is composed of 50% of sound insulation polyvinyl acetal resin and 50% of plasticizer by mass percentage.

In the above examples 20-22: the plasticizer is one or a mixture of more than two of plasticizer 3G8, plasticizer 4G7, di-n-hexyl adipate (DHA for short) and dioctyl adipate (DOA for short);

in the above examples 20-22: the PVB resin for the common membrane is PVB (PVB is polyvinyl acetal for short) resin with a hydroxyl value of 17-21% and viscosity of 1000-1300mPa & s.

In the above embodiment: the polyvinyl alcohol (PVA for short) is polyvinyl alcohol with the polymerization degree of 1700-2000 and the alcoholysis degree of 98-99%, is white solid powder, and can be provided by product production enterprises: sichuan vinylon factories, Anhui Wei group Co., Ltd, Nemontage Douchin environmental protection materials Co., Ltd, etc.

In the above embodiment: the percentages used, not specifically indicated, are percentages by weight or known to those skilled in the art; the proportions used, not specifically noted, are mass (weight) proportions; the masses (weights) may all be grams or kilograms.

In the above embodiment: the process parameters (temperature, time, concentration, etc.) and the amounts of the components in each step are within the range, and any point can be applicable.

The present invention and the technical contents not specifically described in the above examples are the same as those of the prior art, and the raw materials are all commercially available products.

The present invention is not limited to the above-described embodiments, and the present invention can be implemented with the above-described advantageous effects.