High-strength waterproof formaldehyde-free impregnated paper adhesive and preparation method thereof

Abstract

The invention discloses a high-strength water-resistant formaldehyde-free impregnated paper adhesive and a preparation method thereof, and relates to the technical field of formaldehyde-free impregnated paper, the high-strength water-resistant formaldehyde-free impregnated paper adhesive comprises the following raw materials by mass: 40-100 parts of an auxiliary additive; by arranging the auxiliary additive, the waterproof agent, the epoxy resin, the natural rubber raw material, the polyvinyl alcohol, the aromatic and the pigment, the adhesive disclosed by the invention is greatly advanced in the aspects of viscosity, solid content, high-temperature-resistant effect, water-resistant effect and drying speed compared with an existing adhesive, and does not contain formaldehyde or derivatives thereof; the environment-friendly impregnated paper adhesive has the advantages that the environment-friendly requirement is met, harmful gas is not released in the use process, the harm of formaldehyde in the traditional impregnated paper adhesive is effectively avoided, the use requirement is met, each link is conveniently monitored and managed in real time by improving the preparation process, the problem point can be found in the first time when the preparation is abnormal, and the production efficiency is improved. And performing corresponding processing.

Description

Technical Field

[0001] The invention relates to the technical field of formaldehyde-free impregnated paper, in particular to a high-strength water-resistant formaldehyde-free impregnated paper adhesive and a preparation method thereof. Background Art

[0002] Impregnated film paper is widely used in artificial board facing materials due to its aesthetics and decorative and protective effect on the base material of artificial board (fiberboard, particleboard, blockboard, etc.). Among all artificial board facing materials, impregnated film paper is simple to produce, cheap, high in production efficiency, and has the largest market share, accounting for about 60%. Since urea-formaldehyde resin and melamine-formaldehyde resin have low raw material costs and good quality, and are aqueous solutions with low molecular condensation resins, they can be well penetrated into the special facing paper, giving the surface of artificial board added value functions, and the impregnated paper obtained has good wear resistance and scratch resistance. Therefore, the current market is dominated by urea-formaldehyde resin and melamine-formaldehyde impregnated film paper. However, since melamine impregnated paper releases free formaldehyde during production and use, it brings great harm to human health. In addition, melamine impregnated paper also has the problem of large brittleness and is not suitable for use on non-planar processing curved surfaces. And after being compounded with artificial board, it may cause cracks due to changes in temperature and humidity. With the improvement of living standards and the implementation of relevant national policies, the formaldehyde-free and toughening of impregnated film paper has great significance.

[0003] Chinese patent announcement number CN 118727501 A discloses a preparation method and application of high-performance and high-flexibility formaldehyde-free impregnated film paper, which belongs to the technical field of impregnated film paper. The present invention aims to solve the problem that the existing impregnated film paper cannot simultaneously have high strength, high toughness, crack resistance, scratch resistance, wear resistance and no formaldehyde release, and the adhesive has low transparency, which affects the paper texture. Preparation: 1. Adjust the pH of the polyamide epichlorohydrin resin; 2. Prepare polyvinyl alcohol / melamine adhesive; 3. First impregnate the decorative base paper in the polyamide epichlorohydrin resin after pH adjustment, and then dry it to obtain a primary impregnated paper. At room temperature, the primary impregnated paper is impregnated in polyvinyl alcohol / melamine adhesive, and then dried to obtain a high-performance and high-flexibility formaldehyde-free impregnated film paper. Application: It is used as a facing material for artificial boards.

[0004] However, there are still many problems in the above scheme: the adhesives in the prior art have significant problems in terms of viscosity, solid content and drying speed, poor high temperature resistance, poor water resistance, which will also affect the normal service life, and the preparation process is cumbersome and difficult to operate. Therefore, the present invention needs to design a high-strength water-resistant formaldehyde-free impregnated paper adhesive and a preparation method thereof to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a high-strength water-resistant formaldehyde-free impregnated paper adhesive and a preparation method thereof in order to solve the above problems, thereby solving the problems mentioned in the background technology.

[0006] In order to solve the above problems, the present invention provides a technical solution:

[0007] A high-strength water-resistant formaldehyde-free impregnated paper adhesive, comprising the following raw materials in parts by weight:

[0008] Auxiliary additives: 40-100 parts;

[0009] Waterproofing agent: 5-30 parts;

[0010] Epoxy resin: 30-80 parts;

[0011] Natural rubber raw material: 60-160 parts;

[0012] Polyvinyl alcohol: 10-40 parts;

[0013] Aromatherapy: 5-10 parts;

[0014] Pigment: 5-20 parts.

[0015] As a preferred technical solution, the auxiliary additive is one or more combinations of preservatives, water solvents, and toughening agents.

[0016] As a preferred technical solution, the natural gum raw material is one or more combinations of starch natural gum, plant gum, and protein gum.

[0017] As a preferred technical solution, the fragrance is one or more combinations of plant fragrances, geraniol, and coconut oil.

[0018] As a preferred technical solution, the mass ratio of the epoxy resin to the natural rubber raw material is 1:2.

[0019] A method for preparing a high-strength water-resistant formaldehyde-free impregnated paper adhesive comprises the following specific preparation steps:

[0020] S1. Weigh the required epoxy resin, natural rubber raw material, and polyvinyl alcohol according to weight, stir them once through a stirring device, then pour in a waterproofing agent and auxiliary additives in sequence, air-dry and let stand for the first time to obtain a semi-finished adhesive raw material;

[0021] S2, weighing the required fragrance according to weight, pouring it into the semi-finished adhesive raw material, stirring it twice by a stirring device, and after the second stirring, air-drying and standing for a second time to obtain a semi-finished adhesive mixture;

[0022] S3. Weigh the pigment according to the weight, pour it into the semi-finished adhesive mixture, stir it three times by a stirring device, put it into a pigment bucket of the corresponding color, and obtain a semi-finished adhesive test material. Sampling and testing the semi-finished adhesive test material, bonding it with the test product formaldehyde-free impregnated paper, and judging its specific performance after bonding. If it meets the Chinese national standard (GB), the finished adhesive is obtained.

[0023] As a preferred technical solution, in S1, during the first stirring, the temperature is raised at a rate of 5-10°C / min until it reaches 70-180°C, and the first air-drying time is 1-1.5h.

[0024] As a preferred technical solution, in S2, during the secondary stirring, the temperature is increased at a rate of 10-15°C / min until it reaches 100-220°C, and the second air-drying time is 2-3h.

[0025] As a preferred technical solution, the Chinese national standards in S3 include solid content standards, viscosity standards, water resistance standards, high temperature resistance standards, and dryness standards.

[0026] As a preferred technical solution, in S3, during the three stirrings, the heating rate is 1-5°C / min until the temperature reaches 5-40°C.

[0027] The beneficial effects of the present invention are as follows: by setting auxiliary additives, waterproofing agents, epoxy resins, natural rubber raw materials, polyvinyl alcohol, aromatics and pigments, the adhesive of the present application has a considerable lead in viscosity, solid content, high temperature resistance, water resistance and drying speed compared with existing adhesives, effectively improving its overall ease of use. Even in a humid or water-immersed environment, the impregnated paper can still maintain strong mechanical properties, does not contain formaldehyde or its derivatives, meets green environmental protection requirements, does not release harmful gases during use, effectively avoids the hazards of formaldehyde in traditional impregnated paper adhesives, and meets the needs of use. By improving the preparation process, it is convenient to monitor and manage each link in real time. When an abnormality occurs in the preparation, the problem point can be found in the first time and corresponding treatment can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and the accompanying drawings.

[0029] Figure 1 The invention discloses a high-strength water-resistant formaldehyde-free impregnated paper adhesive and an overall flow chart of its preparation method. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0031] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0032] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0034] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0035] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0036] It should be particularly noted that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0037] The optional embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0038] like Figure 1 As shown, this specific implementation adopts the following technical solutions:

[0039] A high-strength water-resistant formaldehyde-free impregnated paper adhesive, comprising the following raw materials in parts by weight:

[0040] Auxiliary additives: 40-100 parts, wherein the auxiliary additives are one or more combinations of preservatives, water solvents, and toughening agents;

[0041] Waterproofing agent: 5-30 parts;

[0042] Epoxy resin: 30-80 parts;

[0043] Natural rubber raw material: 60-160 parts, the natural rubber raw material is one or more combinations of starch natural rubber, plant glue, protein glue, and the mass ratio of the epoxy resin to the natural rubber raw material is 1:2;

[0044] Polyvinyl alcohol: 10-40 parts;

[0045] Aromatherapy agent: 5-10 parts, the aromatherapy agent is one or more combinations of plant fragrance, geraniol, coconut oil;

[0046] Pigment: 5-20 parts.

[0047] A method for preparing a high-strength water-resistant formaldehyde-free impregnated paper adhesive comprises the following specific preparation steps:

[0048] S1. Weigh the required epoxy resin, natural rubber raw material, and polyvinyl alcohol according to weight, stir them once through a stirring device, then pour in a waterproofing agent and auxiliary additives in sequence, air-dry and stand for the first time to obtain an adhesive semi-finished raw material;

[0049] S2, weighing the required fragrance according to weight, pouring it into the semi-finished adhesive raw material, stirring it twice by a stirring device, and after the second stirring, air-drying and standing for a second time to obtain a semi-finished adhesive mixture;

[0050] S3. Weigh the pigment according to the weight, pour it into the semi-finished adhesive mixture, stir it three times by a stirring device, put it into a pigment bucket of the corresponding color, and obtain a semi-finished adhesive test material. Sampling and testing the semi-finished adhesive test material, bonding it with the test product formaldehyde-free impregnated paper, and judging its specific performance after bonding. If it meets the Chinese national standard (GB), the finished adhesive is obtained.

[0051] In this scheme, in S1, during the first stirring, the temperature is raised at a rate of 5-10°C / min until it reaches 70-180°C, and the first air-drying time is 1-1.5h.

[0052] In this scheme, in S2, during the second stirring, the temperature is increased at a rate of 10-15°C / min until it reaches 100-220°C, and the second air-drying time is 2-3h.

[0053] In this solution, the Chinese national standards in S3 include solid content standards, viscosity standards, water resistance standards, high temperature resistance standards, and dryness standards.

[0054] In this solution, in S3, during the three stirrings, the heating rate is 1-5°C / min until the temperature reaches 5-40°C.

[0055] The embodiment of the present invention provides the following technical solutions:

[0056] Example 1

[0057] A method for preparing a high-strength water-resistant formaldehyde-free impregnated paper adhesive comprises 40 parts of auxiliary additives, 5 parts of waterproofing agent, 30 parts of epoxy resin, 60 parts of natural rubber raw materials, 10 parts of polyvinyl alcohol, 5 parts of aromatic agent and 5 parts of pigment.

[0058]

[0059] S1. Weigh 30 parts of epoxy resin, 60 parts of starch natural rubber, and 10 parts of polyvinyl alcohol according to weight, stir once through a stirring device, heat at a heating rate of 5°C / min until 100°C, then pour 5 parts of waterproofing agent and 40 parts of preservative in sequence, air-dry and let stand for the first time, the air-drying time is 1 hour, and obtain an adhesive semi-finished raw material;

[0060] S2, weigh 5 parts of the required plant fragrance according to weight, pour it into the semi-finished adhesive raw material, stir it twice by a stirring device, heat it at a heating rate of 10°C / min until it reaches 120°C, and after the second stirring, air-dry it for a second time and let it stand for 2 hours to obtain a semi-finished adhesive mixture;

[0061] S301, weigh 5 parts of pigment according to weight, pour it into the semi-finished adhesive mixture, stir it three times by a stirring device, heat it at a heating rate of 1°C / min until it reaches 20°C, and put it into a pigment bucket of corresponding color to obtain a semi-finished adhesive test material;

[0062] S302, sampling and testing the semi-finished adhesive test material, marking the samples in order from 1 to 20, performing a group of tests, and bonding with the test product formaldehyde-free impregnated paper;

[0063] S303, judging the specific performance after bonding, and obtaining the finished adhesive product if it meets the Chinese national standard (GB).

[0064] Example 2

[0065] A method for preparing a high-strength water-resistant formaldehyde-free impregnated paper adhesive comprises 100 parts of auxiliary additives, 30 parts of waterproofing agents, 80 parts of epoxy resins, 160 parts of natural rubber raw materials, 40 parts of polyvinyl alcohol, 10 parts of aromatic agents and 20 parts of pigments.

[0066]

[0067]

[0068] S1. Weigh 80 parts of the required epoxy resin, 80 parts of vegetable glue, 80 parts of protein glue, and 40 parts of polyvinyl alcohol according to weight, stir once through a stirring device, heat at a heating rate of 10°C / min until 180°C, then pour in 30 parts of a waterproofing agent, 50 parts of a water solvent, and 50 parts of a toughening agent in sequence, air-dry and let stand for the first time, the air-drying time is 1.5 hours, and obtain an adhesive semi-finished raw material;

[0069] S2, weighing 5 parts of geraniol and 5 parts of coconut oil according to weight, pouring them into the semi-finished adhesive raw material, stirring them twice by a stirring device, heating them at a heating rate of 15°C / min until they reach 220°C, and air-drying them for a second time after the second stirring, and the second air-drying time is 3h to obtain a semi-finished adhesive mixture;

[0070] S301, weigh 20 parts of pigment according to weight, pour it into the semi-finished adhesive mixture, stir it three times by a stirring device, heat it at a heating rate of 5°C / min until it reaches 40°C, and put it into a pigment bucket of corresponding color to obtain a semi-finished adhesive test material;

[0071] S302, sampling and testing the semi-finished adhesive test material, marking the samples in order from 1 to 10, performing a group of tests, and bonding with the test product formaldehyde-free impregnated paper;

[0072] S303, judging the specific performance after bonding, and obtaining the finished adhesive product if it meets the Chinese national standard (GB).

[0073] Example 3

[0074] A method for preparing a high-strength water-resistant formaldehyde-free impregnated paper adhesive comprises 40 parts of auxiliary additives, 20 parts of waterproofing agents, 40 parts of epoxy resins, 80 parts of natural rubber raw materials, 30 parts of polyvinyl alcohol, 5 parts of aromatics and 10 parts of pigments.

[0075]

[0076] S1. Weigh 40 parts of the required epoxy resin, 80 parts of natural rubber raw materials, and 30 parts of polyvinyl alcohol according to weight, stir them once through a stirring device, heat them at a heating rate of 10°C / min until they reach 150°C, then pour in 20 parts of a waterproofing agent and 40 parts of auxiliary additives in sequence, air-dry and let stand for the first time, and the air-drying time is 1.2 hours to obtain a semi-finished adhesive raw material;

[0077] S2, weigh 5 parts of the required fragrance according to weight, pour it into the semi-finished adhesive raw material, stir it twice by a stirring device, heat it at a heating rate of 10°C / min until it reaches 200°C, and after the second stirring, air-dry it for a second time and let it stand for 3 hours to obtain a semi-finished adhesive mixture;

[0078] S301, weigh 10 parts of pigment according to weight, pour it into the semi-finished adhesive mixture, stir it three times by a stirring device, heat it at a heating rate of 5°C / min until it reaches 30°C, and put it into a pigment bucket of corresponding color to obtain a semi-finished adhesive test material;

[0079] S302, sampling and testing the semi-finished adhesive test material, marking the samples in order from 1 to 30, performing a group of tests, and bonding with the test product formaldehyde-free impregnated paper;

[0080] S303, judging the specific performance after bonding, and obtaining the finished adhesive product if it meets the Chinese national standard (GB).

[0081] Table 1 Performance test results

[0082]

[0083] in:

[0084] The solid content was tested using the method of GB / T 22047-2008 "Adhesives for Paper and Paperboard Packaging"; the viscosity was tested using the method of GB / T 2793-2000 "Test Methods for Paper and Paperboard Adhesives"; the water resistance was tested using the method of GB / T 4852-2005 "Adhesives for Paper and Paperboard";

[0085] The high temperature resistance is tested using the GB / T 19339-2003 "Building Paper Adhesives" method; the drying property is tested using the GB / T4852-2005 "Paper and Paperboard Adhesives" method.

[0086] Table 2 Adhesion changes of different adhesives on formaldehyde-free impregnated paper

[0087]

[0088] In summary, it can be obtained from the test results of Table 1 and Table 2 that the adhesive of the present application has a considerable lead over the existing adhesive in terms of viscosity, solid content, high temperature resistance, water resistance and drying speed. Therefore, the adhesive prepared using the above scheme can effectively improve its ease of use. Even in a humid or water-immersed environment, the impregnated paper can still maintain strong mechanical properties, does not contain formaldehyde or its derivatives, meets green environmental protection requirements, does not release harmful gases during use, effectively avoids the hazards of formaldehyde in traditional impregnated paper adhesives, and meets the needs of use.

[0089] Those of ordinary skill in the art will appreciate that the modules and method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0090] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices, equipment and modules can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0091] In addition, it should be noted that the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features described in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0092] It should be noted that the above examples are only specific embodiments of the present invention, and the present invention is obviously not limited to the above examples, and there are many similar variations. All variations directly derived or associated from the contents disclosed by the technicians in this field should fall within the protection scope of the present invention.

[0093] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-strength, water-resistant, formaldehyde-free impregnated paper adhesive, characterized in that: The invention comprises the following raw materials in parts by weight: Auxiliary additives: 40-100 parts; Waterproofing agent: 5-30 parts; Epoxy resin: 30-80 parts; Natural rubber raw material: 60-160 parts; Polyvinyl alcohol: 10-40 parts; Aromatherapy: 5-10 parts; Pigment: 5-20 parts.

2. The high-strength water-resistant formaldehyde-free impregnated paper adhesive according to claim 1, characterized in that: The auxiliary additive is one or more combinations of preservatives, water solvents, and toughening agents.

3. The high-strength water-resistant formaldehyde-free impregnated paper adhesive according to claim 1, characterized in that: The natural rubber raw material is one or more combinations of starch natural rubber, plant rubber and protein rubber.

4. The high-strength water-resistant formaldehyde-free impregnated paper adhesive according to claim 1, characterized in that: The fragrance is one or more combinations of plant fragrances, geraniol and coconut oil.

5. The high-strength water-resistant formaldehyde-free impregnated paper adhesive according to claim 1, characterized in that: The mass ratio of the epoxy resin to the natural rubber raw material is 1:

2.

6. A method for preparing a high-strength, water-resistant, formaldehyde-free impregnated paper adhesive, for implementing the high-strength, water-resistant, formaldehyde-free impregnated paper adhesive as claimed in any one of claims 1 to 5, characterized in that: The method comprises the following specific preparation steps: S1. Weigh the required epoxy resin, natural rubber raw material, and polyvinyl alcohol according to weight, stir them once through a stirring device, then pour in a waterproofing agent and auxiliary additives in sequence, air-dry and stand for the first time to obtain an adhesive semi-finished raw material; S2, weighing the required fragrance according to weight, pouring it into the semi-finished adhesive raw material, stirring it twice by a stirring device, and after the second stirring, air-drying and standing for a second time to obtain a semi-finished adhesive mixture; S3. Weigh the pigment according to the weight, pour it into the semi-finished adhesive mixture, stir it three times by a stirring device, put it into a pigment bucket of the corresponding color, and obtain the semi-finished adhesive test material. Sampling and testing the semi-finished adhesive test material, bonding it with the test product formaldehyde-free impregnated paper, and judging its specific performance after bonding. If it meets the Chinese national standard (GB), the finished adhesive is obtained.

7. The method for preparing the high-strength water-resistant formaldehyde-free impregnated paper adhesive according to claim 6, characterized in that: In S1, during the first stirring, the temperature is raised at a rate of 5-10°C / min until it reaches 70-180°C, and the first air-drying time is 1-1.5h.

8. The method for preparing the high-strength water-resistant formaldehyde-free impregnated paper adhesive according to claim 6, characterized in that: In S2, during the second stirring, the temperature is increased at a rate of 10-15°C / min until the temperature reaches 100-220°C, and the second air-drying time is 2-3h.

9. The method for preparing the high-strength water-resistant formaldehyde-free impregnated paper adhesive according to claim 6, characterized in that: The Chinese national standards in S3 include solid content standards, viscosity standards, water resistance standards, high temperature resistance standards, and dryness standards.

10. The method for preparing the high-strength water-resistant formaldehyde-free impregnated paper adhesive according to claim 9, characterized in that: In S3, during the three stirrings, the temperature is raised at a rate of 1-5°C / min until the temperature reaches 5-40°C.

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