阅读说明：本技术 一种纤维乳胶复合胶粘剂及其制备方法 (Fiber latex composite adhesive and preparation method thereof ) 是由 罗思勤 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种纤维乳胶复合胶粘剂,包含以下质量组分：天然乳胶50～90份、热活化棉纤维溶解液10～15份、催化剂2～6份、增粘剂5～6份、增塑剂3～4份、增稠剂0.5～1份、消泡剂0.2～0.5份。本发明通过采用热活化棉纤维溶解液与天然乳胶进行复合,热活化棉纤维在复合过程中会形成凝胶薄膜对天然乳胶颗粒进行包覆,能够在一定程度上阻止天然乳胶颗粒与其他助剂发生交联,降低胶粘剂的自我粘结；同时,本发明通过采用具有良好化学结构稳定性及力学性能的棉纤维与天然乳胶进行复合,增强胶粘剂的力学性能,其作用类似于混凝土中的钢筋,能够有效改善胶粘剂的胶结强度。(The invention discloses a fiber latex composite adhesive, which comprises the following components in parts by mass: 50-90 parts of natural latex, 10-15 parts of a heat activated cotton fiber solution, 2-6 parts of a catalyst, 5-6 parts of a tackifier, 3-4 parts of a plasticizer, 0.5-1 part of a thickener and 0.2-0.5 part of a defoaming agent. According to the invention, the thermal activation cotton fiber solution is compounded with the natural latex, the thermal activation cotton fiber can form a gel film to coat the natural latex particles in the compounding process, the natural latex particles can be prevented from being crosslinked with other auxiliary agents to a certain extent, and the self-adhesion of the adhesive is reduced; meanwhile, the invention adopts the cotton fiber with good chemical structure stability and mechanical property to be compounded with the natural latex, so that the mechanical property of the adhesive is enhanced, the function of the adhesive is similar to that of a steel bar in concrete, and the bonding strength of the adhesive can be effectively improved.)

1. The fiber latex composite adhesive is characterized by comprising the following components in parts by mass: 50-90 parts of natural latex, 10-15 parts of a heat activated cotton fiber solution, 2-6 parts of a catalyst, 5-6 parts of a tackifier, 3-4 parts of a plasticizer, 0.5-1 part of a thickener and 0.2-0.5 part of a defoaming agent.

2. The fiber latex composite adhesive as claimed in claim 1, wherein the heat-activated cotton fiber solution comprises the components of cotton fiber, sodium hydroxide, urea and deionized water in a mass ratio of 30-40: 2-5: 2-4: 100; the polymerization degree of the cotton fibers is 1000-1500.

3. The fiber latex composite adhesive according to claim 1, wherein the tackifier is one or more of ABS resin, SBS resin, MBS resin, C5 petroleum resin and water-based tackifier resin XY-8025.

4. The fiber latex composite adhesive according to claim 1, wherein said plasticizer is one or more of liquid butyronitrile, polyisobutylene, liquid petroleum and naphthenic oil.

5. The fiber latex composite adhesive according to claim 1, wherein the thickener is one or more of erythritol, pentadiol, hexitol and hydrogenated maltose.

6. The fiber latex composite adhesive according to claim 1, wherein the defoaming agent is one or more of tributyl phosphate, diisopropanolamine and polydimethylsiloxane.

7. The fiber latex composite adhesive according to claim 1, wherein said catalyst is hexamethylenetetramine, dicyandiamide or a mixture of both.

8. The preparation method of the fiber latex composite adhesive according to any one of claims 1 to 7, characterized by comprising the following steps:

s1, adding 50-90 parts by mass of natural latex, 10-15 parts by mass of heat activated cotton fiber solution and 2-6 parts by mass of catalyst into a reaction kettle, and blending for 0.5-1 h under the environmental conditions that the temperature is 60-80 ℃, the vacuum degree is 100-500 Pa and the pressure is 1-2 Mpa;

s2, adding 5-6 parts by mass of a tackifier, 3-4 parts by mass of a plasticizer, 0.5-1 part by mass of a thickener and 0.2-0.5 part by mass of a defoaming agent into the reaction kettle in the step S1, and mixing for 1-10 hours in the reaction kettle at the temperature of 60-80 ℃, the vacuum degree of 100-500 Pa and the pressure of 1-2 Mpa to obtain the fiber latex composite adhesive.

9. The method of claim 8, wherein the step of preparing the heat-activated cotton fiber dissolving solution comprises:

s10) dispersing 30-40 parts of heat-activated cotton fiber material, 2-5 parts of sodium hydroxide and 2-4 parts of urea in 100 parts of deionized water according to the mass ratio, and mixing to obtain a cotton fiber dispersion liquid;

s11) freezing and dissolving the cotton fiber dispersion liquid to obtain the heat activated cotton fiber dissolving liquid.

Technical Field

The invention belongs to the technical field of adhesive preparation, and particularly relates to a fiber latex composite adhesive and a preparation method thereof.

Background

The natural latex is a natural high molecular compound which is prepared by filtering and coagulating latex collected from natural plants and takes polyisoprene as a main component. Latex particles of natural latex are basically polyisoprene as a core and are surrounded by a non-rubber component shell (such as protein and lipid), and the chemical structure of the latex particles shows that the natural latex is non-polar unsaturated rubber, and the structure is not stable and the mechanical property is poor.

The natural latex is one of the main raw materials for preparing the adhesive, and the chemical structure and the mechanical property of the natural latex directly influence the chemical structure stability and the mechanical property of the adhesive.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the fiber latex composite adhesive and the preparation method thereof, and the self-bonding of the adhesive is reduced and the bonding strength of the adhesive is improved by compounding the heat-activated cotton fiber dissolving solution and the natural latex.

In order to achieve the aim, the invention provides a fiber latex composite adhesive, which comprises the following components in parts by mass: 50-90 parts of natural latex, 10-15 parts of a heat activated cotton fiber solution, 2-6 parts of a catalyst, 5-6 parts of a tackifier, 3-4 parts of a plasticizer, 0.5-1 part of a thickener and 0.2-0.5 part of a defoaming agent.

Preferably, in the technical scheme, the heat-activated cotton fiber dissolving solution comprises cotton fibers, sodium hydroxide, urea and deionized water in a mass ratio of 30-40: 2-5: 2-4: 100, and the polymerization degree of the cotton fibers is 1000-1500.

Preferably, in the technical scheme, the tackifier is one or more of ABS resin, SBS resin, MBS resin, C5 petroleum resin, water-based tackifying resin XY-8025 and the like.

Preferably, in the above technical scheme, the plasticizer is one or more of liquid butyronitrile, polyisobutylene, liquid petroleum, naphthenic oil and the like.

Preferably, in the above technical scheme, the thickener is one or more of erythritol, pentadiol, hexitol, hydrogenated maltose, and the like.

Preferably, in the above technical scheme, the defoaming agent is one or more of tributyl phosphate, diisopropanolamine, polydimethylsiloxane, and the like.

Preferably, the catalyst in the above technical scheme is hexamethylenetetramine, dicyandiamide or a mixture of the hexamethylenetetramine and the dicyandiamide.

In addition, the invention provides a method for preparing the fiber latex composite adhesive in the technical scheme, which comprises the following steps:

s1, adding 50-90 parts by mass of natural latex, 10-15 parts by mass of heat activated cotton fiber solution and 2-6 parts by mass of catalyst into a reaction kettle, and blending for 0.5-1 h under the environmental conditions that the temperature is 60-80 ℃, the vacuum degree is 100-500 Pa and the pressure is 1-2 Mpa;

s2, adding 5-6 parts by mass of a tackifier, 3-4 parts by mass of a plasticizer, 0.5-1 part by mass of a thickener and 0.2-0.5 part by mass of a defoaming agent into the reaction kettle in the step S1, and mixing for 1-10 hours in the reaction kettle at the temperature of 60-80 ℃, the vacuum degree of 100-500 Pa and the pressure of 1-2 Mpa to obtain the fiber latex composite adhesive.

Preferably, the step of preparing the heat-activated cotton fiber dissolving solution in the above technical solution includes:

s10) dispersing 30-40 parts of heat-activated cotton fiber material, 2-5 parts of sodium hydroxide and 2-4 parts of urea in 100 parts of deionized water according to the mass ratio, and mixing to obtain a cotton fiber dispersion liquid;

s11) freezing and dissolving the cotton fiber dispersion liquid to obtain the heat activated cotton fiber dissolving liquid.

In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

1) according to the invention, the thermal activation cotton fiber solution is compounded with the natural latex, the thermal activation cotton fiber can form a gel film to coat the natural latex particles in the compounding process, the natural latex particles can be prevented from being crosslinked with other auxiliary agents to a certain extent, and the self-adhesion of the adhesive is reduced;

2) the invention adopts the cotton fiber with good chemical structure stability and mechanical property to compound with the natural latex, thereby enhancing the mechanical property of the adhesive, having the effect similar to that of a steel bar in concrete, and effectively improving the bonding strength of the adhesive.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In the following examples, the polymerization degree of the cotton fiber is 1000-1500, and the cotton fiber is heated in an oven at 200 ℃ for 40 minutes to obtain the heat-activated cotton fiber.

Example 1

A preparation method of a fiber latex composite adhesive comprises the following specific steps:

step 1: dispersing 30 parts of heat-activated cotton fiber material with the polymerization degree of 1000, 2 parts of sodium hydroxide and 2 parts of urea in 100 parts of deionized water according to the mass ratio, and mixing to obtain cotton fiber dispersion liquid;

step 2: standing the cotton fiber dispersion liquid at the temperature of-25 ℃ for freezing for 10h, and dissolving to obtain the heat activated cotton fiber dissolving liquid;

and step 3: adding 50 parts by mass of natural latex, 10 parts by mass of heat activated cotton fiber dissolving solution and 2 parts by mass of hexamethylenetetramine into a reaction kettle, and blending for 1h under the environmental conditions that the temperature is 60 ℃, the vacuum degree is 100Pa and the pressure is 1 Mpa;

and 4, step 4: 5 parts by mass of ABS resin PA757 and 3 parts by mass of liquid butyronitrile NBR_L2368. And (3) adding 0.5 part by mass of erythritol and 0.2 part by mass of tributyl phosphate into the reaction kettle in the step (3), and blending for 10 hours in the reaction kettle at the temperature of 60 ℃, the vacuum degree of 100Pa and the pressure of 1Mpa to obtain the fiber latex composite adhesive.

Example 2

A preparation method of a fiber latex composite adhesive comprises the following specific steps:

step 1: dispersing 35 parts of a heat-activated cotton fiber material with the polymerization degree of 1200, 3 parts of sodium hydroxide and 3 parts of urea in 100 parts of deionized water according to the mass ratio, and mixing to obtain a cotton fiber dispersion liquid;

step 2: and standing the cotton fiber dispersion liquid at the temperature of-25 ℃ for freezing for 10h, and dissolving to obtain the heat-activated cotton fiber dissolving liquid.

And step 3: adding 70 parts by mass of natural latex, 13 parts by mass of heat activated cotton fiber dissolving solution and 4 parts by mass of dicyandiamide into a reaction kettle, and blending for 0.7h under the environmental conditions of 70 ℃ of temperature, 300Pa of vacuum degree and 1.5Mpa of pressure;

and 4, step 4: and (2) adding 5 parts by mass of SBS792 resin, 3 parts by mass of polyisobutylene (with the molecular weight of 1000-3000), 0.5 part by mass of pentanol and 0.3 part by mass of diisopropanolamine into the reaction kettle in the step (3), and blending for 5 hours in the reaction kettle at the temperature of 70 ℃, the vacuum degree of 300Pa and the pressure of 1.5Mpa to obtain the fiber latex composite adhesive.

Example 3

A preparation method of a fiber latex composite adhesive comprises the following specific steps:

step 1: dispersing 30 parts of heat-activated cotton fiber material with the polymerization degree of 1500, 2 parts of sodium hydroxide and 2 parts of urea in 100 parts of deionized water according to the mass ratio, and mixing to obtain cotton fiber dispersion liquid;

step 2: and standing the cotton fiber dispersion liquid at the temperature of-25 ℃ for freezing for 10h, and dissolving to obtain the heat-activated cotton fiber dissolving liquid.

And step 3: adding 90 parts by mass of natural latex, 15 parts by mass of heat activated cotton fiber dissolving solution and 6 parts by mass of hexamethylenetetramine/dicyandiamide blend (the mass ratio of the two is 1:1) into a reaction kettle, and blending for 0.5h under the environmental conditions that the temperature is 80 ℃, the vacuum degree is 500Pa and the pressure is 2 Mpa;

and 4, step 4: adding 6 parts by mass of MBS resin/C5 petroleum resin blend (the mass ratio of the MBS resin is 1:1, the MBS resin is QIM-05, the specification of alicyclic C5 petroleum resin: CY-ANH-M1100-M1120), 4 parts by mass of liquid petroleum LA 300/naphthenic oil KG16C blend (the mass ratio of the two is 2:1), 1 part by mass of hexitol/hydrogenated maltose blend (the mass ratio of the two is 1:1), and 0.5 part by mass of diisopropanolamine/polydimethylsiloxane blend (the mass ratio of the two is 0.5:1, and the number of polydimethylsiloxane CAS is 9016-00-6) into the reaction kettle in the step 3, and blending for 1h in the reaction kettle with the temperature of 80 ℃, the vacuum degree of 500Pa and the pressure of 2Mpa to obtain the fiber latex composite adhesive.

Example 4

A preparation method of a fiber latex composite adhesive comprises the following specific steps:

step 1: dispersing 40 parts of heat-activated cotton fiber material with the polymerization degree of 1500, 5 parts of sodium hydroxide and 4 parts of urea in 100 parts of deionized water according to the mass ratio, and mixing to obtain cotton fiber dispersion liquid;

step 2: and standing the cotton fiber dispersion liquid at the temperature of-25 ℃ for freezing for 10h, and dissolving to obtain the heat-activated cotton fiber dissolving liquid.

And step 3: adding 90 parts by mass of natural latex, 15 parts by mass of heat activated cotton fiber dissolving solution and 6 parts by mass of hexamethylenetetramine/dicyandiamide blend (mass ratio is 1:1) into a reaction kettle, and blending for 0.5h under the environmental conditions of 80 ℃ of temperature, 500Pa of vacuum degree and 2Mpa of pressure;

and 4, step 4: adding 6 parts by mass of MBS resin/C5 petroleum resin blend (the mass ratio of the two is 1:1, the MBS resin is QIM-05, the specification of alicyclic C5 petroleum resin: CY-ANH-M1100-M1120), 4 parts by mass of liquid petroleum LA 300/naphthenic oil KG16C blend (the mass ratio of the two is 2:1), 1 part by mass of hexitol/hydrogenated maltose blend (the mass ratio of the two is 1:1), and 0.5 part by mass of diisopropanolamine/polydimethylsiloxane blend (the mass ratio of the two is 0.5:1, and the number of polydimethylsiloxane CAS 9016-00-6) into the reaction kettle in the step 3, and blending for 1h in the reaction kettle with the temperature of 80 ℃, the vacuum degree of 500Pa and the pressure of 2Mpa to obtain the fiber latex composite adhesive.

Comparative example

Adding 90 parts by mass of natural latex, 6 parts by mass of a hexamethylenetetramine/dicyandiamide blend (mass ratio of 1:1), 6 parts by mass of an MBS resin/C5 petroleum resin blend (mass ratio of 1:1, the MBS resin is QIM-05, the specification of an alicyclic C5 petroleum resin: CY-ANH-M1100-M1120), 4 parts by mass of a liquid petroleum LA 300/naphthenic oil KG16C blend (mass ratio of 2:1), 1 part by mass of a hexitol/hydrogenated maltose blend (mass ratio of 1:1) and 0.5 part by mass of a diisopropanolamine/polydimethylsiloxane blend (mass ratio of 0.5:1, polydimethylsiloxane CAS number of 9016-00-6) into a reaction kettle, and blending for 1h in the reaction kettle with the temperature of 80 ℃, the vacuum degree of 500Pa and the pressure of 2MPa to obtain the adhesive.

The comparative performance of the adhesives prepared in examples 1-4 and comparative example was measured, and the results are shown in Table 1, with the test standard GB/T2791-1995.

TABLE 1

Serial number	Example 1	Example 2	Example 3	Example 4	Comparative example
						Adhesive strength (Mpa)	1.69	1..77	1.71	1.81	0.98
Peel strength (N.M)	82.43	84.37	83.19	84.91	47.06

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.