阅读说明：本技术 一种环保型pvc纸用复合胶水及其制备方法 (Environment-friendly composite glue for PVC paper and preparation method thereof ) 是由 曹阳 陈亮 张冰 陈安贵 于 2020-08-13 设计创作，主要内容包括：本发明公开了一种环保型PVC纸用复合胶水及其制备方法,所述一种环保型PVC纸用复合胶水的制造材料包括甲醛、尿素、三聚氰胺、催化剂和固化剂,所述环保型PVC纸用复合胶水制造材料的质量份数为甲醛40-45份、尿素35-38份、三聚氰胺0.5-1份、催化剂1-2份、固化剂0.4-0.5份。本发明采用的制造方法简单易操作,可以对环保型PVC纸用复合胶水进行大批量的生产；而将甲醛与尿素分批次的加入反应,并不断调节其PH值可以将环保型PVC纸用复合胶水内部的甲醛进行有效的去除,防止PVC纸在涂胶之后残留大量的甲醛而影响到使用者的身体健康。(The invention discloses an environment-friendly composite glue for PVC paper and a preparation method thereof, wherein the manufacturing material of the environment-friendly composite glue for PVC paper comprises, by mass, 40-45 parts of formaldehyde, 35-38 parts of urea, 0.5-1 part of melamine, 1-2 parts of a catalyst and 0.4-0.5 part of a curing agent. The manufacturing method adopted by the invention is simple and easy to operate, and can be used for producing the environment-friendly composite glue for PVC paper in large batch; the formaldehyde and the urea are added in batches for reaction, and the PH value of the formaldehyde and the urea is continuously adjusted, so that the formaldehyde in the environment-friendly PVC paper composite glue can be effectively removed, and the influence on the body health of a user due to the fact that a large amount of formaldehyde is left in the PVC paper after gluing is prevented.)

1. The utility model provides an environment-friendly PVC is compound glue for paper which characterized in that: the manufacturing material of the environment-friendly composite glue for PVC paper comprises, by mass, 40-45 parts of formaldehyde, 35-38 parts of urea, 0.5-1 part of melamine, 1-2 parts of a catalyst and 0.4-0.5 part of a curing agent.

2. The environment-friendly composite glue for PVC paper as claimed in claim 1, characterized in that: the preparation method of the environment-friendly composite glue for PVC paper comprises the following steps:

(1) weighing materials: weighing formaldehyde, urea, melamine, a catalyst and a curing agent in corresponding parts by weight for later use;

(2) primary reaction: placing 35-40% of formaldehyde and 40-50% of urea weighed in the step (1) in a reaction kettle for heating, stirring the formaldehyde and the urea in the heating process, heating to 75-78 ℃ in the stirring process, maintaining the corresponding temperature, and preserving the heat for 30-35min while stirring to form a mixed solution A;

(3) adjusting acidity and alkalinity: firstly, detecting the pH value of the mixed solution A, then adjusting the pH value of the mixed solution A obtained in the step (2) by using a catalyst, adjusting the pH value of the mixed solution A to be between 5.5 and 6.4, and naturally cooling the mixed solution A to be between 35 and 40 ℃ for later use after the pH value is adjusted;

(4) and (3) secondary reaction: placing the residual formaldehyde and urea in the step (1) into a mixed solution A in a reaction kettle for heating, stirring the manufacturing raw materials in the reaction kettle in the heating process, heating the raw materials to 92-95 ℃ in the stirring process, maintaining the corresponding temperature, preserving the heat for 15-20min while stirring to form a mixed solution B, naturally cooling the mixed solution B to 35-40 ℃ for later use, adding a corresponding mass part of melamine into the mixed solution B after cooling, and fully stirring to obtain a mixed solution C;

(5) acid-base secondary regulation: firstly, detecting the pH value of the mixed solution C, then adjusting the pH value of the mixed solution C by using a catalyst, adjusting the pH value of the mixed solution C in the step (4) to 7.4-7.8, and naturally cooling the mixed solution A to 35-40 ℃ for later use after the pH value is adjusted;

(6) and (3) curing: and (4) adding a curing agent in a corresponding mass part into the mixed solution C obtained in the step (4), wherein the curing agent needs to be slowly added in the adding process, the curing agent needs to be continuously stirred in the adding process, and after the curing agent is added, the pH value is adjusted by using a catalyst, so that the environment-friendly PVC paper composite glue can be obtained.

3. The environment-friendly composite glue for PVC paper as claimed in claim 1, characterized in that: the catalyst is divided into an acid catalyst and a basic catalyst, the acid catalyst is a hydrogen chloride solution, the basic catalyst is a sodium hydroxide solution, the acid catalyst is added when the mixed solution needs to be adjusted to be acidic, and the basic catalyst is added when the mixed solution needs to be adjusted to be basic.

4. The environment-friendly composite glue for PVC paper as claimed in claim 1, characterized in that: the curing agent is a polyamide curing agent.

5. The environment-friendly composite glue for PVC paper as claimed in claim 1, characterized in that: the pH value of the environment-friendly PVC paper manufactured by the composite glue is 7.4-8.2.

Technical Field

The invention relates to glue, in particular to environment-friendly composite glue for PVC paper and a preparation method thereof.

Background

PVC paper is mostly attached to the surface of a wall panel, namely deep embossing wallpaper and resin wallpaper, wood pulp fiber paper and non-woven fiber paper are used as base materials, high-grade resin slurry is coated on the surface of the base materials, professional deep embossing production equipment is used, different printing wheels are adopted according to different patterns, and the required wallpaper patterns are printed on the surface of the wallpaper. After the wallpaper is softened, the surface of the wallpaper is pressed by the embossing roller to generate corresponding texture effect. And multiple processes such as drying, high temperature, cooling and the like are also included in the wallpaper, so that the three-dimensional appearance and the environmental protection performance of the wallpaper are guaranteed.

After the production and manufacture of the PVC paper are finished, the PVC paper is usually attached to the surface of the wall panel for protection and decoration, glue is usually coated on the PVC paper in the production and manufacture process, a certain amount of formaldehyde may remain in the use process of the composite glue for PVC paper due to the particularity of the manufacturing raw materials, but the excessive residue of the formaldehyde may affect the health condition of a user, and therefore, an environment-friendly composite glue for PVC paper and a preparation method thereof are provided.

Disclosure of Invention

The invention aims to provide environment-friendly composite glue for PVC paper and a preparation method thereof, and aims to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the environment-friendly composite glue for the PVC paper comprises, by mass, 40-45 parts of formaldehyde, 35-38 parts of urea, 0.5-1 part of melamine, 1-2 parts of a catalyst and 0.4-0.5 part of a curing agent.

Further, the preparation method of the environment-friendly composite glue for PVC paper comprises the following steps:

(1) weighing materials: weighing formaldehyde, urea, melamine, a catalyst and a curing agent in corresponding parts by weight for later use;

(2) primary reaction: placing 35-40% of formaldehyde and 40-50% of urea weighed in the step (1) in a reaction kettle for heating, stirring the formaldehyde and the urea in the heating process, heating to 75-78 ℃ in the stirring process, maintaining the corresponding temperature, and preserving the heat for 30-35min while stirring to form a mixed solution A;

(3) adjusting acidity and alkalinity: firstly, detecting the pH value of the mixed solution A, then adjusting the pH value of the mixed solution A obtained in the step (2) by using a catalyst, adjusting the pH value of the mixed solution A to be between 5.5 and 6.4, and naturally cooling the mixed solution A to be between 35 and 40 ℃ for later use after the pH value is adjusted;

(4) and (3) secondary reaction: placing the residual formaldehyde and urea in the step (1) into a mixed solution A in a reaction kettle for heating, stirring the manufacturing raw materials in the reaction kettle in the heating process, heating the raw materials to 92-95 ℃ in the stirring process, maintaining the corresponding temperature, preserving the heat for 15-20min while stirring to form a mixed solution B, naturally cooling the mixed solution B to 35-40 ℃ for later use, adding a corresponding mass part of melamine into the mixed solution B after cooling, and fully stirring to obtain a mixed solution C;

(5) acid-base secondary regulation: firstly, detecting the pH value of the mixed solution C, then adjusting the pH value of the mixed solution C by using a catalyst, adjusting the pH value of the mixed solution C in the step (4) to 7.4-7.8, and naturally cooling the mixed solution A to 35-40 ℃ for later use after the pH value is adjusted;

(6) and (3) curing: and (4) adding a curing agent in a corresponding mass part into the mixed solution C obtained in the step (4), wherein the curing agent needs to be slowly added in the adding process, the curing agent needs to be continuously stirred in the adding process, and after the curing agent is added, the pH value is adjusted by using a catalyst, so that the environment-friendly PVC paper composite glue can be obtained.

Further, the catalyst is divided into an acid catalyst and a basic catalyst, the acid catalyst is a hydrogen chloride solution, the basic catalyst is a sodium hydroxide solution, the acid catalyst is added when the mixed solution needs to be adjusted to be acidic, and the basic catalyst is added when the mixed solution needs to be adjusted to be basic.

Furthermore, the curing agent is a polyamide curing agent.

Further, the pH value of the environment-friendly PVC paper manufactured by the composite glue is 7.4-8.2.

The manufacturing method adopted by the invention is simple and easy to operate, and can be used for producing the environment-friendly composite glue for PVC paper in large batch;

the formaldehyde and the urea are added in batches for reaction, and the PH value of the formaldehyde and the urea is continuously adjusted, so that the formaldehyde in the environment-friendly PVC paper composite glue can be effectively removed, and the influence on the body health of a user due to the fact that a large amount of formaldehyde is left in the PVC paper after gluing is prevented.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.