阅读说明：本技术 一种高反应活性聚氨酯压敏胶及其制备方法 (High-reactivity polyurethane pressure-sensitive adhesive and preparation method thereof ) 是由 喻四海 车荣升 施法宽 于 2019-08-15 设计创作，主要内容包括：本发明属于胶粘剂技术领域,具体公开了一种高反应活性聚氨酯压敏胶及其制备方法,由如下重量份的原料组成：天然橡胶12-18份、聚氨酯12-18份、石油树脂12-15份、氧化锌2-3份、填料1-4份、抗氧剂1-4份、橡胶促进剂0.2-0.8份、吸水剂0.5-1.5份、表面活性剂0.5-1份、紫外线吸收剂0.2-0.8份、环烷油1-3份,余量为水；本发明采用天然橡胶和橡胶促进剂增强了压敏胶的整体伸长率及拉伸剪切强度,改善了现有的压敏胶的使用性能,扩大了压敏胶的使用范围,且可在65-90℃的温度下2min内实现较高程度的固化,胶面对贴不脱胶,用此压敏胶可制得一些低耐温膜材的聚氨酯胶保护膜如PE、PP、PVC类保护膜,同时采用表面活性剂使得压敏胶具有高反应活性。(The invention belongs to the technical field of adhesives, and particularly discloses a high-reactivity polyurethane pressure-sensitive adhesive and a preparation method thereof, wherein the high-reactivity polyurethane pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 12-18 parts of natural rubber, 12-18 parts of polyurethane, 12-15 parts of petroleum resin, 2-3 parts of zinc oxide, 1-4 parts of filler, 1-4 parts of antioxidant, 0.2-0.8 part of rubber accelerator, 0.5-1.5 parts of water absorbent, 0.5-1 part of surfactant, 0.2-0.8 part of ultraviolet absorbent, 1-3 parts of naphthenic oil and the balance of water; the invention adopts natural rubber and rubber accelerator to enhance the whole elongation and tensile shear strength of the pressure-sensitive adhesive, improves the service performance of the existing pressure-sensitive adhesive, enlarges the application range of the pressure-sensitive adhesive, can realize higher-degree curing within 2min at the temperature of 65-90 ℃, and can not be bonded on the adhesive surface.)

1. A high-reactivity polyurethane pressure-sensitive adhesive is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 12-18 parts of natural rubber, 12-18 parts of polyurethane, 12-15 parts of petroleum resin, 2-3 parts of zinc oxide, 1-4 parts of filler, 1-4 parts of antioxidant, 0.2-0.8 part of rubber accelerator, 0.5-1.5 parts of water absorbent, 0.5-1 part of surfactant, 0.2-0.8 part of ultraviolet absorbent, 1-3 parts of naphthenic oil and the balance of water.

2. The high-reactivity polyurethane pressure-sensitive adhesive according to claim 1, wherein: the natural rubber is one of linear/star structure natural rubber or a mixture of linear and star structure natural rubber.

3. the high-reactivity polyurethane pressure-sensitive adhesive according to claim 1, wherein: the filler is one of an organic and inorganic filler.

4. The high-reactivity polyurethane pressure-sensitive adhesive according to claim 1, wherein: the catalyst is one or a mixture of more of an organic tin catalyst, an organic bismuth catalyst, an organic amine catalyst, a titanate catalyst, a piperazine derivative catalyst and a morpholine catalyst.

5. The high-reactivity polyurethane pressure-sensitive adhesive according to claim 1, wherein: the antioxidant is one or more of antioxidant 245, antioxidant 1035, antioxidant 1076, antioxidant 1098 and antioxidant 3114.

6. The high-reactivity polyurethane pressure-sensitive adhesive according to claim 1, wherein: the surfactant is one of nonylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether sodium sulfate, an organosilicon surfactant or a fluorocarbon surfactant.

7. A preparation method of high-reactivity polyurethane pressure-sensitive adhesive is characterized by comprising the following steps: the method comprises the following steps:

s1, weighing 88-90 parts by mass of polyurethane, sequentially adding 0.3-0.5 part by mass of rubber accelerator, 1-1.3 parts by mass of water absorbent, 1-1.5 parts by mass of catalyst, 0.5-1 part by mass of surfactant, 2-3 parts by mass of antioxidant and 0.3-0.5 part by mass of ultraviolet absorbent, and dividing the antioxidant, the rubber accelerator and the water absorbent into two parts;

S2, firstly, taking a reaction kettle, controlling the temperature in the reaction kettle to be 15-20 ℃, adding naphthenic oil into the reaction kettle, stirring uniformly, and slowly adding natural rubber into the reaction kettle while stirring;

S3, continuously stirring under the conditions that the reaction kettle is closed and the temperature in the reaction kettle is 15-20 ℃, and adding petroleum resin into the reaction kettle after the natural rubber is dissolved;

S4, a third step, stirring for 1-1.5h under the condition that the reaction kettle is closed and the temperature in the kettle is 15-20 ℃, then sequentially adding the rest of filler, antioxidant, rubber accelerator and water absorbent, keeping the reaction kettle closed and the temperature in the kettle is 15-20 ℃, and continuously stirring for 30-50 min, and then stopping stirring;

and S5, finally pouring the mixture obtained by stirring in the step S4 out of the reaction kettle, and filtering the mixture by using filter cloth of 200-300 meshes to obtain the polyurethane pressure-sensitive adhesive.

Technical Field

the invention belongs to the technical field of adhesive processing, and particularly relates to a high-reactivity polyurethane pressure-sensitive adhesive and a preparation method thereof.

Background

pressure-sensitive adhesive, which is called pressure-sensitive adhesive for short, is an adhesive with sensitivity to pressure, and is mainly used for preparing pressure-sensitive adhesive tapes, the stripping force of the general pressure-sensitive adhesive (the stripping force after the adhesive tape is pressed and adhered to an adhered surface) is less than the cohesive force of the adhesive (the acting force between pressure-sensitive adhesive molecules) is less than the adhesive base force of the adhesive (the adhesive force between the adhesive and a base material), the pressure-sensitive adhesive can not be degummed and the like in the using process, the pressure-sensitive adhesive can be divided into two types of rubber and resin according to the main resin components, the rubber type can be divided into natural rubber and synthetic rubber, the resin type mainly comprises acrylic acid, organic silicon and polyurethane, and the rubber pressure-sensitive adhesive is added with other auxiliary components besides the main component of rubber.

the existing polyurethane pressure-sensitive glue is widely applied due to the characteristics of low viscosity, stable viscosity, good air permeability, static resistance, low pollution and the like, but because the temperature required by the crosslinking curing reaction is high, the polyurethane pressure-sensitive glue is only applied to a membrane material with higher temperature resistance at present, the application range is small, and the limitation is strong.

disclosure of Invention

the invention aims to provide a high-reactivity polyurethane pressure-sensitive adhesive and a preparation method thereof, and aims to solve the problems of the existing technology in the background that the adhesion is not firm, the adhesion is easy to break and the adhesion performance is low.

In order to achieve the purpose, the invention adopts the following technical scheme:

A high-reactivity polyurethane pressure-sensitive adhesive and a preparation method thereof are disclosed, which comprises the following raw materials in parts by weight: 12-18 parts of natural rubber, 12-18 parts of polyurethane, 12-15 parts of petroleum resin, 2-3 parts of zinc oxide, 1-4 parts of filler, 1-4 parts of antioxidant, 0.2-0.8 part of rubber accelerator, 0.5-1.5 parts of water absorbent, 0.5-1 part of surfactant, 0.2-0.8 part of ultraviolet absorbent, 1-3 parts of naphthenic oil and the balance of water;

preferably, the natural rubber is one of linear/star structure natural rubber or a mixture of linear and star structure natural rubber.

preferably, the filler is one of an organic and an inorganic filler.

preferably, the catalyst is one or a mixture of more of an organic tin catalyst, an organic bismuth catalyst, an organic amine catalyst, a titanate catalyst, a piperazine derivative catalyst and a morpholine catalyst.

Preferably, the antioxidant is one or more of an antioxidant 245, an antioxidant 1035, an antioxidant 1076, an antioxidant 1098 and an antioxidant 3114.

Preferably, the surfactant is one of nonylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether sodium sulfate, an organosilicon surfactant and a fluorocarbon surfactant.

a preparation method of high-reactivity polyurethane pressure-sensitive adhesive comprises the following steps:

S1, weighing 88-90 parts by mass of polyurethane, sequentially adding 0.3-0.5 part by mass of rubber accelerator, 1-1.3 parts by mass of water absorbent, 1-1.5 parts by mass of catalyst, 0.5-1 part by mass of surfactant, 2-3 parts by mass of antioxidant and 0.3-0.5 part by mass of ultraviolet absorbent, and dividing the antioxidant, the rubber accelerator and the water absorbent into two parts;

s2, firstly, taking a reaction kettle, controlling the temperature in the reaction kettle to be 15-20 ℃, adding naphthenic oil into the reaction kettle, stirring uniformly, and slowly adding natural rubber into the reaction kettle while stirring;

S3, continuously stirring under the conditions that the reaction kettle is closed and the temperature in the reaction kettle is 15-20 ℃, and adding petroleum resin into the reaction kettle after the natural rubber is dissolved;

s4, a third step, stirring for 1-1.5h under the condition that the reaction kettle is closed and the temperature in the kettle is 15-20 ℃, then sequentially adding the rest of filler, antioxidant, rubber accelerator and water absorbent, keeping the reaction kettle closed and the temperature in the kettle is 15-20 ℃, and continuously stirring for 30-50 min, and then stopping stirring;

And S5, finally pouring the mixture obtained by stirring in the step S4 out of the reaction kettle, and filtering by adopting filter cloth with 200-300 meshes to obtain the polyurethane pressure-sensitive adhesive.

The invention has the technical effects and advantages that: compared with the prior art, the high-reactivity polyurethane pressure-sensitive adhesive and the preparation method thereof adopt the natural rubber and the rubber accelerator to enhance the integral elongation and tensile shear strength of the pressure-sensitive adhesive, improve the service performance of the existing pressure-sensitive adhesive, expand the application range of the pressure-sensitive adhesive, realize higher-degree solidification within 2min at the temperature of 65-90 ℃, do not resist adhesive surface-to-surface adhesion, can prepare polyurethane adhesive protective films of low-temperature-resistant film materials such as PE, PP and PVC protective films, and adopt the surfactant to enable the pressure-sensitive adhesive to have high reactivity.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting. 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.