A paper surface sizing agent, its preparation method and application

Abstract

The application discloses a paper surface sizing agent and a preparation method and application thereof. The paper surface sizing agent comprises the following components: 70-88 wt% of soybean protein isolate, 5-8% of ricinoleic acid, 10-5% of maleic anhydride, 0.1-5% of polyhydric alcohol, and the rest is water. The application uses food production solid waste soybean protein isolate, has the characteristics of green and sustainable, etc. The used soybean protein isolate is rich in a large number of functional carboxyl and amino groups, can be conveniently reacted with other active substances to generate biomacromolecular products. Meanwhile, the biomacromolecular products are antibacterial and non-toxic, and can be used as a material for paper coating for food packaging.

Description

Technical Field

[0001] This application relates to a papermaking surface sizing agent, its preparation method, and its application, belonging to the field of papermaking technology. Background Technology

[0002] In recent years, the research and development of renewable and biodegradable green products has received unprecedented attention. Among them, soy protein isolate, as a green food production residue, has considerable application potential in the production of biopolymers. Currently, there has been some research on the separation, modification, and application of soy protein isolate in nanocomposite materials, pharmaceuticals, and food, both domestically and internationally. However, there are few literature reports on its application in papermaking, especially in paper sizing.

[0003] Paper sizing agents are an important class of chemicals in the paper industry. They enhance the physical strength of paper by increasing the bonding force between paper fibers. Currently, commonly used sizing agents in the paper industry are mainly derived from petroleum and food products. Considering the current oil and food crises facing my country, it is essential to develop a biomass-based paper sizing agent product. Summary of the Invention

[0004] According to one aspect of this application, a papermaking surface sizing agent is provided, the papermaking surface sizing agent comprising the following components:

[0005] Soy protein isolate 70–88 wt%;

[0006] 5-8% ricinoleic acid;

[0007] Maleic anhydride 10-5%;

[0008] Polyols 0.1-5%;

[0009] The rest is water.

[0010] The polyol is selected from at least one of ethylene glycol, propylene glycol, and glycerol.

[0011] According to another aspect of this application, a method for preparing the above-mentioned papermaking surface sizing agent is provided, wherein castor oil acid, polyol and maleic anhydride are mixed, concentrated sulfuric acid is added dropwise under stirring until the sulfuric acid concentration is 10%, the mixture is reacted, and then mixed with soy protein isolate and water, stirred rapidly, and sonicated to obtain the papermaking surface sizing agent.

[0012] The reaction temperature is 75–100°C;

[0013] The reaction time is 1–4 hours;

[0014] The temperature of the rapid stirring is 50–75°C;

[0015] The rapid stirring time is 1 to 2 hours;

[0016] The duration of the ultrasound is 0.5 to 1 hour.

[0017] According to another aspect of this application, an application of the above-mentioned papermaking surface sizing agent is provided for manufacturing at least one of corrugated base paper, boxboard, and yarn tube paper.

[0018] The beneficial effects that this application can produce include:

[0019] This application utilizes soy protein isolate from food production solid waste, which is characterized by its green and sustainable nature. The soy protein isolate used is rich in functionalizable carboxyl and amino groups, which can easily react with other active substances to generate biomolecular products. Furthermore, these macromolecular products are antibacterial and non-toxic, and can be used as a coating material for food packaging paper. Detailed Implementation

[0020] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0021] Unless otherwise specified, all raw materials used in the embodiments of this application were purchased through commercial channels.

[0022] Example 1

[0023] 5 g of ricinoleic acid, 5 g of maleic anhydride, and 1 g of ethylene glycol were mixed by stirring. Concentrated sulfuric acid was added dropwise under rapid stirring until the sulfuric acid concentration reached 10%. The mixture was heated in a water bath to 80°C and stirred for 1 hour. The resulting product was then mixed with 80 g of soy protein isolate and 10 g of water. The mixture was stirred rapidly in a 50°C water bath for 1 hour, followed by sonication for 0.5 hours to obtain a modified soy protein sizing agent. A surface sizing method was used, controlling the sizing amount to 10 g / m³. 2 The results were compared with those obtained using a 100% starch surface sizing agent. The physical strength data of the collected paper sheets are shown in Table 1.

[0024] Table 1. Paper physical strength data for Example 1

[0025]

[0026] Example 2

[0027] 8 g of ricinoleic acid, 10 g of maleic anhydride, and 2 g of ethylene glycol were mixed by stirring. Concentrated sulfuric acid was added dropwise under rapid stirring until the sulfuric acid concentration reached 10%. The mixture was heated in a water bath to 80°C and stirred for 1 hour. The resulting product was then mixed with 75 g of soy protein isolate and 5 g of water. The mixture was stirred rapidly in a 50°C water bath for 1 hour, followed by sonication for 0.5 hours to obtain a modified soy protein sizing agent. A surface sizing method was used, controlling the sizing amount to 10 g / m³. 2The results were compared with those obtained using a 100% starch surface sizing agent. The physical strength data of the collected paper sheets are shown in Table 2.

[0028] Table 2. Paper physical strength data for Example 2

[0029]

[0030] Example 3

[0031] 8 g of ricinoleic acid, 10 g of maleic anhydride, and 2 g of glycerol were mixed by stirring. Concentrated sulfuric acid was added dropwise under rapid stirring until the sulfuric acid concentration reached 10%. The mixture was heated in a water bath to 80°C and stirred for 1 hour. The resulting product was then mixed with 70 g of soy protein isolate and 10 g of water. The mixture was stirred rapidly in a 50°C water bath for 1 hour, followed by sonication for 0.5 hours to obtain a modified soy protein sizing agent. A surface sizing method was used, controlling the sizing amount to 10 g / m³. 2 The results were compared with those obtained using a 100% starch surface sizing agent. The physical strength data of the collected paper sheets are shown in Table 3.

[0032] Table 3. Paper physical strength data for Example 3

[0033]

[0034] Example 4

[0035] 5 g of ricinoleic acid, 10 g of maleic anhydride, and 5 g of glycerol were mixed by stirring. Concentrated sulfuric acid was added dropwise under rapid stirring until the sulfuric acid concentration reached 10%. The mixture was heated in a water bath to 80°C and stirred for 1 hour. The resulting product was then mixed with 78 g of soy protein isolate and 2 g of water. The mixture was stirred rapidly in a 50°C water bath for 1 hour, followed by sonication for 0.5 hours to obtain a modified soy protein sizing agent. A surface sizing method was used, controlling the sizing amount to 10 g / m³. 2 The results were compared with those obtained using a 100% starch surface sizing agent. The physical strength data of the collected paper sheets are shown in Table 1.

[0036] Table 4. Paper physical strength data for Example 4

[0037]

[0038] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A paper surface sizing agent, characterized in that, The paper surface sizing agent comprises the following components: Soy protein isolate 70–88 wt%; 5-8% ricinoleic acid; Maleic anhydride 10-5%; Polyols 0.1-5%; The rest is water.

2. The papermaking surface sizing agent according to claim 1, characterized in that, The polyol is selected from at least one of ethylene glycol, propylene glycol, and glycerol.

3. A method for preparing the papermaking surface sizing agent according to claim 1, characterized in that, Castor oil acid, polyol, and maleic anhydride are mixed, and concentrated sulfuric acid is added dropwise while stirring. The mixture is then reacted with soy protein isolate and water, stirred rapidly, and sonicated to obtain the paper surface sizing agent.

4. The preparation method according to claim 3, characterized in that, The reaction temperature is 75–100°C; The reaction time is 1–4 hours; The temperature of the rapid stirring is 50–75°C; The rapid stirring time is 1 to 2 hours; The duration of the ultrasound is 0.5 to 1 hour.

5. The application of a papermaking surface sizing agent according to any one of claims 1 or 2, characterized in that, Used to manufacture at least one of corrugated base paper, boxboard, and yarn tube paper.

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