Thermosensitive coating paint and preparation method thereof

Abstract

The invention discloses a thermosensitive coating paint and a preparation method thereof, the thermosensitive coating paint comprises the following components in parts by weight: 6 to 12 parts of a water repellent agent, 5 to 25 parts of an adhesive and 7 to 35 parts of a polyvinyl alcohol material. The modified glyoxal type water repellent agent and hydroxyl in the adhesive (styrene-butadiene emulsion, acrylic resin and polyvinyl alcohol) are cross-linked and cured to form a net-shaped cured film, so that the surface strength is improved, and the wet friction resistance of the material is effectively improved.

Description

Technical Field

[0001] The invention relates to a heat-sensitive coating material and a preparation method thereof. Background Art

[0002] With the rapid development of e-commerce, the express logistics industry has experienced explosive growth. In this context, the demand for express electronic waybill face materials, as an important part of the logistics industry, has increased dramatically.

[0003] However, the express electronic waybill surface materials in the prior art are mainly produced based on national standards and cannot meet customers' demands for personalization and special performance, especially in terms of wet friction performance.

[0004] Traditional materials have a short service life in actual application environments and are not resistant to wet friction, which limits their performance under changing climate and usage conditions. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a thermosensitive coating and a preparation method thereof, which can significantly improve the wet friction resistance of express electronic waybills. The specific technical solution is as follows:

[0006] A heat-sensitive coating material, comprising a water-repellent agent, an adhesive and a polyvinyl alcohol material, wherein each component is calculated by weight.

[0007] The water repellent is 6 to 12 parts,

[0008] The adhesive is 5 to 25 parts,

[0009] The polyvinyl alcohol material is 7 to 35 parts.

[0010] As a further preferred technical solution, the water repellent is a modified glyoxal type water repellent.

[0011] As a further preferred technical solution, the adhesive includes styrene-butadiene emulsion, acrylic resin, and polyvinyl alcohol.

[0012] As a further preferred technical solution, the polyvinyl alcohol material is a polyvinyl alcohol material with an alcoholysis degree of 99% and a high degree of polymerization.

[0013] As a further preferred technical solution, the thermal-sensitive coating paint also includes a filler, and the ratio between the adhesive and the filler is 11-12:9-8.

[0014] As a further preferred technical solution, the ratio between the adhesive and the polyvinyl alcohol material is 6-8:4-6.

[0015] The preparation method of the heat-sensitive coating material comprises the following steps:

[0016] Weigh the following raw materials respectively: 8-9 parts by mass of filler, 11-12 parts by mass of adhesive, 6-12 parts by mass of water repellent, and 7-35 parts by mass of polyvinyl alcohol material.

[0017] Add water into the reaction kettle, and then add filler, adhesive, water repellent, and polyvinyl alcohol material in sequence, mix and stir for 15-20 minutes, and control the stirring speed to 3000-5000r / min to obtain the thermal sensitive coating.

[0018] The beneficial effects of the present invention are:

[0019] The present invention selects a modified glyoxal type water repellent agent and cross-links and solidifies the hydroxyl groups in the adhesive (styrene-butadiene emulsion, acrylic resin, polyvinyl alcohol) to form a network-shaped solidified film, thereby improving the surface strength and effectively improving the wet friction resistance of the material.

[0020] By adjusting the adhesive-to-pigment ratio of the protective layer to adhesive: filler = 55-60:45-40, and using polyvinyl alcohol with a 99% alcoholysis degree and a high degree of polymerization, the coating thickness is made more uniform and the surface is more dense after drying, further enhancing its performance in a wet friction environment.

[0021] The present invention can meet the actual needs of customers in different regions by improving the formulation process of thermosensitive materials, and help to occupy a larger market share. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be described clearly and completely in combination with the embodiments below. Comparative Examples 1 to 4 are comparative examples, Examples 5 to 6 are used to prepare thermal sensitive coatings, and Example 7 is an effect example.

[0023] Comparative Example 1

[0024] Weigh the following raw materials respectively: 8 parts by mass of filler, 12 parts by mass of adhesive, and 10 parts by mass of polyvinyl alcohol material, add water into the reactor, and then add filler, adhesive, and polyvinyl alcohol material in sequence, mix and stir for 15-20 minutes, and control the stirring speed to 3000-5000r / min to obtain the thermosensitive coating.

[0025] Comparative Example 2

[0026] Weigh the following raw materials respectively: 8 parts by mass of filler, 8 parts by mass of water repellent, and 10 parts by mass of polyvinyl alcohol material, add water into the reactor, and then add the filler, water repellent, and polyvinyl alcohol material in sequence, mix and stir for 15-20 minutes, and control the stirring speed to 3000-5000r / min to obtain the thermosensitive coating.

[0027] Comparative Example 3

[0028] The following raw materials were weighed separately: 9 parts by mass of filler, 11 parts by mass of adhesive, 8 parts by mass of water repellent, and 10 parts by mass of polyvinyl alcohol material. Water was added to the reactor, and then filler, adhesive, water repellent, and polyvinyl alcohol material were added in sequence. The mixture was mixed and stirred for 15-20 minutes. The stirring speed was controlled at 3000-5000 r / min to obtain a thermosensitive coating.

[0029] Comparative Example 4

[0030] Weigh the following raw materials respectively: 8 parts by mass of filler, 12 parts by mass of adhesive, and 8 parts by mass of water repellent, add water into the reactor, then add filler, adhesive, and water repellent in sequence, mix and stir for 15-20 minutes, and control the stirring speed to 3000-5000r / min to obtain the thermosensitive coating.

[0031] Example 5

[0032] The following raw materials were weighed separately: 9 parts by mass of filler, 11 parts by mass of adhesive, 8 parts by mass of water repellent, and 10 parts by mass of polyvinyl alcohol material. Water was added to the reactor, and then filler, adhesive, water repellent, and polyvinyl alcohol material were added in sequence. The mixture was mixed and stirred for 15-20 minutes. The stirring speed was controlled at 3000-5000 r / min to obtain a thermosensitive coating.

[0033] Example 6

[0034] Weigh the following raw materials respectively: 8 parts by mass of filler, 12 parts by mass of adhesive, 8 parts by mass of water repellent, and 10 parts by mass of polyvinyl alcohol material, add water into the reactor, and then add filler, adhesive, water repellent, and polyvinyl alcohol material in sequence, mix and stir for 15-20 minutes, and control the stirring speed to 3000-5000r / min to obtain the thermosensitive coating.

[0035] Example 7 Effect Example

[0036] This example is to apply the coating prepared in Control Examples 1-4 and Examples 5-6 to the express delivery bill, and measure two sets of data respectively. The two sets of data are:

[0037] 1) After soaking for 10 minutes, push the coated surface with your finger at zero pressure until the water turns milky white;

[0038] 2) After the sample is soaked in water for 1 second, place the sample on the smooth side of a carton, place your finger on the back of the printed barcode, and then push hard on the carton until the image is destroyed.

[0039] As shown in Table 1:

[0040] Table 1.

[0041]

[0042] As can be seen from the above table, after the sample is soaked for 10 minutes, the coated surface is pushed flat with a finger at 0 pressure until the water turns milky white. Examples 5 and 6 use modified glyoxal-type water-repellent to cross-link and cure with the hydroxyl groups in the adhesive (styrene-butadiene emulsion, acrylic resin, polyvinyl alcohol) to form a network-like cured film, which can improve the surface strength and achieve the effect of wet friction resistance.

[0043] At the same time, by adjusting the rubber-pigment ratio of the protective layer, the film-forming performance of the coating is improved, thereby improving the weather resistance of the coating.

[0044] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view. In addition, it should be understood that although this specification is described in accordance with the implementation methods, it does not contain only one technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A heat-sensitive coating material, characterized in that: It includes water repellent, adhesive and polyvinyl alcohol material, each component is calculated by weight. The water repellent is 6 to 12 parts, The adhesive is 5 to 25 parts, The polyvinyl alcohol material is 7 to 35 parts.

2. The heat-sensitive coating material according to claim 1, characterized in that: The water repellent is a modified glyoxal type water repellent.

3. The heat-sensitive coating material according to claim 2, characterized in that: The adhesive comprises styrene-butadiene emulsion, acrylic resin and polyvinyl alcohol.

4. The heat-sensitive coating material according to claim 3, characterized in that: The polyvinyl alcohol material is a polyvinyl alcohol material with an alcoholysis degree of 99% and a high degree of polymerization.

5. The heat-sensitive coating material according to claim 4, characterized in that: The thermal-sensitive coating paint also includes a filler, and the ratio between the adhesive and the filler is 11-12:9-8.

6. The heat-sensitive coating material according to claim 5, characterized in that: The ratio between the adhesive and the polyvinyl alcohol material is 6~8:4~6.

7. The method for preparing a heat-sensitive coating according to any one of claims 1 to 6, characterized in that: The steps involved are: Weigh the following raw materials respectively: 8-9 parts by mass of filler, 11-12 parts by mass of adhesive, 6-12 parts by mass of water repellent, and 7-35 parts by mass of polyvinyl alcohol material. Add water into the reaction kettle, and then add filler, adhesive, water repellent, and polyvinyl alcohol material in sequence, mix and stir for 15-20 minutes, and control the stirring speed to 3000-5000r / min to obtain the thermal sensitive coating.

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