阅读说明：本技术 一种增粘剂及其制备方法和应用 (Tackifier and preparation method and application thereof ) 是由 吴信朋 刘金景 吴士玮 苏长泳 王充 徐佳龙 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种增粘剂及其制备方法和应用,该制备方法包括：将苯乙烯-马来酸酐聚合物和改性淀粉进行反应,得到所述增粘剂。本发明的增粘剂能够提高改性沥青的粘接强度。本发明的技术方案成本低、原材料资源丰富：作为其中的原材料,淀粉是一种可再生绿色材料,具有来源广泛、产量充足、价格低廉、无毒无污染等优势；进而使得改性淀粉的来源广泛、价格低廉。(The invention discloses a tackifier and a preparation method and application thereof, wherein the preparation method comprises the following steps: and reacting the styrene-maleic anhydride polymer with the modified starch to obtain the tackifier. The tackifier disclosed by the invention can improve the bonding strength of the modified asphalt. The technical scheme of the invention has low cost and rich raw material resources: as the raw material, the starch is a renewable green material and has the advantages of wide source, sufficient yield, low price, no toxicity, no pollution and the like; further, the source of the modified starch is wide and the price is low.)

1. A preparation method of a tackifier is characterized by comprising the following steps: and reacting the styrene-maleic anhydride polymer with the modified starch to obtain the tackifier.

2. The production method according to claim 1, wherein the production method comprises: and reacting the styrene-maleic anhydride polymer with the modified starch in the presence of a solvent and an alkaline regulator to obtain the tackifier.

3. The production method according to claim 2, wherein the production method comprises:

(1) uniformly mixing the modified starch with water, and then adjusting the pH to 8-10 by using the alkaline regulator to obtain a modified starch solution;

(2) mixing the styrene-maleic anhydride polymer with an organic solvent, and heating until the styrene-maleic anhydride polymer is completely dissolved; and then cooling to the reaction temperature, adding the modified starch solution, and reacting to obtain the tackifier.

4. The production method according to any one of claims 1 to 3, wherein the modified starch is an oxidized modified starch;

preferably, the molecular weight of the oxidized modified starch is 10-15 ten thousand.

5. The production method according to any one of claims 1 to 3, wherein the styrene-maleic anhydride copolymer has a number average molecular weight of 15 to 20 ten thousand.

6. The production method according to claim 5, wherein the styrene-maleic anhydride copolymer has a molar ratio of styrene to maleic anhydride of 2 (0.1 to 1).

7. The production method according to any one of claims 1 to 3, wherein the mass ratio of the styrene-maleic anhydride polymer to the modified starch is 1 (0.1 to 1);

the reaction temperature is (40-50) DEG C.

8. The production method according to claim 2 or 3, wherein the alkaline modifier is a NaOH solution having a mass concentration of 3%.

9. A tackifier produced by the production process according to any one of claims 1 to 8.

10. Use of the tackifier of claim 9 as a polymer modified asphalt tackifier.

Technical Field

The invention belongs to the technical field of tackifiers, and particularly relates to a tackifier and a preparation method and application thereof.

Background

The self-adhesive polymer modified asphalt waterproof coiled material is a novel waterproof material with great development prospect. Has grown up just at home and abroad, and the method is not popular. The coiled material has the characteristics of good impermeability, low-temperature flexibility, deformation resistance, self-healing property and the like, is easy to construct, and can improve the laying speed and accelerate the project progress. The success of waterproofing depends not only on its own quality but also is closely related to the adhesive sealing of the roll and the roof.

The self-adhesive modified asphalt tackifier is an important raw material for producing modified asphalt waterproof coiled materials. The tackifier is added into the modified asphalt to wet the adhered surface through surface diffusion or internal diffusion, so that the adhesive strength between the modified asphalt and the adhered material is improved. The tackifier is mainly rosin, terpene resin, petroleum resin, etc. In recent years, petroleum resins have been increasingly replacing natural resin tackifiers (rosin and terpene resins) because of their characteristics of high peel adhesion strength, good quick adhesion, stable adhesion, moderate melt viscosity, good heat resistance, good compatibility with high polymer matrices, and low cost. However, petroleum resins have the disadvantages of high brittleness, poor film-forming properties, lack of polar groups in structure, and the like, thereby limiting the wide application of the petroleum resins in the field of modified asphalt.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a novel tackifier which has low cost and good film forming property and can effectively improve the bonding property of modified asphalt.

In order to achieve the above object, a first aspect of the present invention provides a method for preparing a tackifier, the method comprising: and reacting the styrene-maleic anhydride polymer with the modified starch to obtain the tackifier.

The second aspect of the present invention provides the tackifier prepared by the above preparation method.

A third aspect of the invention provides the use of the above described tackifier as a tackifier for polymer modified asphalt.

The technical scheme of the invention has the following beneficial effects:

(1) the tackifier disclosed by the invention can improve the bonding strength of the modified asphalt.

(2) The technical scheme of the invention has low cost and rich raw material resources: as the raw material, the starch is a renewable green material and has the advantages of wide source, sufficient yield, low price, no toxicity, no pollution and the like; further, the source of the modified starch is wide and the price is low.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Detailed Description

Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

A first aspect of the present invention provides a method for producing a tackifier, the method comprising: and reacting the styrene-maleic anhydride polymer with the modified starch to obtain the tackifier.

According to the invention, the styrene-maleic anhydride polymer and the modified starch can be grafted by the method disclosed by the invention, so that the styrene-maleic anhydride polymer grafted modified starch is obtained.

According to the present invention, preferably, the preparation method comprises: and reacting the styrene-maleic anhydride polymer with the modified starch in the presence of a solvent and an alkaline regulator to obtain the tackifier.

In the present invention, the solvent includes an organic solvent and water; the organic solvent is preferably acetone.

According to the present invention, preferably, the preparation method comprises:

(1) uniformly mixing the modified starch with water, and then adjusting the pH to 8-10 by using the alkaline regulator to obtain a modified starch solution;

(2) mixing the styrene-maleic anhydride polymer with an organic solvent, and heating until the styrene-maleic anhydride polymer is completely dissolved; and then cooling to the reaction temperature, adding the modified starch solution, and reacting to obtain the tackifier.

In the invention, preferably, the weight ratio of the modified starch to the water is 1 (2-5); the organic solvent is preferably acetone; the mass ratio of the organic solvent to the styrene-maleic anhydride polymer is preferably (8-15): 1; the reaction temperature is (40-50) DEG C; the reaction time is preferably 3 to 5 hours.

According to the present invention, preferably, the modified starch is an oxidatively modified starch;

preferably, the molecular weight of the oxidized modified starch is 10-15 ten thousand.

The tackifier of the invention can improve the bonding strength of the modified asphalt: on one hand, a large number of polar groups such as carbonyl, carboxyl and hydroxyl exist on the molecular structure of the oxidized modified starch, and the modified asphalt forms intermolecular hydrogen bonds and matched bonds with the base layer through the polar groups to generate stronger bonding strength; on the other hand, the tackifier has good film forming property and can effectively improve the cohesive strength of the modified asphalt.

According to the present invention, preferably, the number average molecular weight of the styrene-maleic anhydride copolymer is 15 to 20 ten thousand;

according to the invention, the molar ratio of styrene to maleic anhydride in the styrene-maleic anhydride copolymer is preferably 2 (0.1-1).

According to the invention, the mass ratio of the styrene-maleic anhydride polymer to the modified starch is preferably 1 (0.1-1);

the reaction temperature is (40-50) DEG C.

In the present invention, the reaction time is preferably 3 to 5 hours.

According to the invention, preferably, the alkaline regulator is a 3% NaOH solution.

The second aspect of the present invention provides the tackifier prepared by the above preparation method.

A third aspect of the invention provides the use of the above described tackifier as a tackifier for polymer modified asphalt.

In the present invention, the addition amount of the tackifier of the present invention can be selected by those skilled in the art according to the viscosity and strength requirements of the polymer modified asphalt to be prepared. The method of application of the tackifier of the present invention is further illustrated, for example, by the following method of application:

the use formula comprises the following components: 100 parts of matrix asphalt, 4-8 parts of SBS and 2-4 parts of tackifier.

The using method comprises the following steps: heating the base asphalt to 150-185 ℃, adding SBS into the base asphalt, stirring and shearing to completely melt SBS and uniformly disperse SBS in the base asphalt, then adding the tackifier of the invention, and fully stirring to obtain the self-adhesive polymer modified asphalt with high cohesiveness.

Wherein the base asphalt is at least one selected from 200#, 90#, 70# and 30# asphalt.

Wherein the stirring and shearing time is 40-140 min.

The invention is further illustrated by the following examples:

the modified starch used in each of the following examples is an oxidized modified starch having a molecular weight of 10 to 15 ten thousand, which is an industrial-grade oxidized modified starch purchased from northern Hebei Baiwei Biotech Co., Ltd; the number average molecular weight of the used styrene-maleic anhydride copolymer is 15-20 ten thousand, and the styrene-maleic anhydride copolymer is purchased from Osage plastics chemical Co., Ltd, Dongguan city, and has the brand number SZ-10010; the C5 petroleum resin used in the following comparative examples was obtained from Ningbo Yoghover resin Co.