Antifreeze and water-resistant paper product adhesive and preparation method thereof

Abstract

The invention discloses an antifreeze and water-resistant paper product adhesive, characterized in that the mass ratio of each component is: water 600-1000, polyvinyl alcohol 50-100 with alcoholysis degree of 98-100, phosphoric acid 8-15, formaldehyde 8-15, urea 3-50, boric acid 3-5, BD-168 cross-linking water-resistant agent 5-25, Kathon 1-3, magnesium chloride 0-100, calcium chloride 0-100 and ammonia water adjusted to pH 5-7 in an appropriate amount. The invention also discloses a preparation method of the antifreeze and water-resistant paper product adhesive, which has low preparation cost, good initial viscosity of the product, wide applicability, excellent antifreeze and water-resistant performance, and is suitable for bonding at room temperature.

Description

Technical Field

[0001] The invention relates to the field of polymer material adhesives, and in particular to an antifreeze and water-resistant paper product adhesive with excellent performance and a preparation method thereof. Background Art

[0002] At present, the adhesives used in the production of paper products such as corrugated cardboard, honeycomb cardboard, and paper boxes are mostly starch adhesives, polyvinyl alcohol adhesives, white latex, etc.

[0003] Starch adhesive has a wide range of raw materials and a simple adhesive making process. It is basically made of water, starch, alkali, borax, oxidant and stabilizer, which are stirred and reacted in a certain ratio and order. However, in actual use, it has the problems of slow drying speed, slow speed and poor water resistance. The corrugated cardboard produced is prone to moisture and softening, which leads to a decrease in bonding strength and edge pressure strength.

[0004] Although polyvinyl alcohol modified adhesives and white latex have better bonding and quick-drying properties than starch adhesives, they also have poor initial adhesion, high cost, lack of water resistance, poor frost resistance, and cannot be used after freezing in winter. They cannot meet the requirements of special paper product packaging production with water and moisture resistance.

[0005] Chinese invention patent CN1438284 discloses a water-resistant starch adhesive for single-sided and corrugated cardboard production lines and a preparation method thereof, which is characterized in that it is made by stirring and reacting water, starch, borax, sodium hydroxide, melamine formaldehyde resin, phenolic resin, styrene acrylic emulsion, and pure acrylic emulsion; the adhesive described in this invention has water-resistant and moisture-proof properties, but the drying speed is relatively slow during use, the steam pressure of the paper machine is high, and the energy consumption is high.

[0006] Chinese invention patent 201010213557.5 discloses an adhesive for high-strength and water-resistant corrugated paperboard. The weight ratio of the ingredients in the adhesive is: 15-25 parts of corn starch, 75-80 parts of water, 0.1-0.4 parts of flake caustic soda, 0.3-0.6 parts of borax, and 0.5-1.2 parts of a reinforcing agent. The adhesive described in this invention has good water resistance, but the adhesive has poor compatibility of components and is easy to delaminate.

[0007] Chinese invention patent 201510351715.6 discloses an adhesive for water-resistant corrugated cardboard and its preparation method. The invention adopts a self-emulsification method, using polyester polyol, emulsifier, diisocyanate, dibutyltin dilaurate and diol as the main raw materials to synthesize a one-component water-based polyurethane adhesive specifically used for water-resistant corrugated cardboard bonding. Although the adhesive has strong adaptability to the bonded material, good water resistance, and can be cured at room temperature, it cannot be widely used due to its high cost.

[0008] Therefore, the market is in urgent need of an environmentally friendly paper product adhesive that has low-temperature or room-temperature bonding, good initial adhesion, low cost, wide applicability, and antifreeze and water-resistant properties. Summary of the invention

[0009] The object of the present invention is to provide an environmentally friendly paper product adhesive which has good initial adhesion, low cost, wide applicability and antifreeze and water resistance.

[0010] To achieve the above purpose, the antifreeze and water-resistant paper product adhesive of the present invention comprises the following components in mass ratio: 600-1000 water, 50-100 polyvinyl alcohol with a degree of alcoholysis of 98-100, 8-15 phosphoric acid, 8-15 formaldehyde, 3-50 urea, 3-5 boric acid, 5-25 BD-168 cross-linking water-resistant agent, 1-3 kason, 0-100 magnesium chloride, 0-100 calcium chloride and a proper amount of ammonia water to adjust the pH value to 5-7.

[0011] The cross-linked water-resistant agent is BD-168 cross-linked water-resistant agent.

[0012] The present invention also discloses a method for preparing the antifreeze and water-resistant paper product adhesive, which is carried out according to the following steps:

[0013] (1) Add 50% of the total water into the reactor, add polyvinyl alcohol with a degree of alcoholysis of 98-100 under stirring, raise the temperature to 95-98°C, keep the temperature for 2 hours, and then cool down to 90-92°C;

[0014] (2) Add phosphoric acid in the formula while stirring at a constant speed, adjust the pH value to 2-3, then add formaldehyde, keep the temperature at 90-92°C for 4-5 hours, then add urea and react for 30 minutes;

[0015] (3) Add 40% of the total water volume of cold water under uniform stirring, wait until the temperature drops below 50°C, dissolve the boric acid in the formula with 10% of the total water volume of warm water, slowly add it to the reactor, then add the BD-168 cross-linking water-resistant agent in the formula, and continue to stir the cross-linking reaction for 1 hour;

[0016] (4) According to the antifreeze requirement, magnesium chloride and calcium chloride are dissolved in water and added into the reaction kettle, and the kasson in the formula ratio is added, and then the pH value is adjusted to 5-7 with appropriate amount of ammonia water to obtain an antifreeze and water-resistant paper product adhesive.

[0017] The present invention has the following advantages:

[0018] The present invention adopts BD-168 cross-linking water-resistant agent, timely uses phosphoric acid or ammonia water to adjust the pH value to a suitable value during the reaction process, and accurately controls reaction conditions such as reaction temperature, which is conducive to forming a cross-linked structure, enhancing the antifreeze performance of the water resistance of the adhesive, and enabling the adhesive to still maintain good bonding performance in a humid environment. The present invention optimizes the control of reaction conditions while taking into account the reaction speed and reaction effect, which is conducive to the performance and quality of the final product of the adhesive, and improves production efficiency and product consistency.

[0019] The specific formula of the present invention and the corresponding reaction step arrangement, the antifreeze and water-resistant paper product adhesive prepared by the present invention has good water resistance and antifreeze performance, stable product quality, low raw material cost and overall preparation cost, and can prepare an environmentally friendly paper product adhesive with wide applicability, room temperature bonding, and excellent antifreeze and water resistance at a low cost.

[0020] Specifically, the present invention mainly uses polyvinyl alcohol with a degree of alcoholysis of 98 to 100 to crosslink with phosphoric acid, formaldehyde, and boric acid to produce good initial viscosity and water resistance; then BD-168 crosslinking water-resistant agent (the product is produced by Henan Beidou Zhongchuang High-tech Research Institute Co., Ltd.) is added to react, so that the water resistance of the adhesive is significantly improved. Urea reacts with the remaining free formaldehyde to improve the frost resistance. According to the winter temperature, different amounts of magnesium chloride and calcium chloride are added to improve the frost resistance; the adhesive of the present invention has the advantages of wide applicability, strong initial viscosity, low cost, frost resistance and water resistance, and meets the production requirements of special paper products such as corrugated boxes, honeycomb paperboards, paper boxes and paper tubes that require water and moisture resistance.

[0021] When the application occasion requires quick drying and high-strength bonding, the product prepared in Example 3 is more suitable; when the application occasion requires good fluidity and deeper penetration, the product prepared in Example 1 is more suitable; the product prepared in Example 2 is more suitable for the application occasion that requires a balance between fluidity and deeper penetration and quick drying and high-strength bonding. In short, the present invention can be used to prepare antifreeze and water-resistant paper product adhesives suitable for various application occasions. DETAILED DESCRIPTION

[0022] In the present invention, all numerical ranges such as "98 to 100" include both end values. The BD-168 cross-linked water-resistant agent used in the present invention is produced by Henan Beidou Zhongchuang High-tech Research Institute Co., Ltd.

[0023] Embodiment 1

[0024] The present embodiment provides an antifreeze and water-resistant paper product adhesive with excellent performance, wherein the mass ratio of the components is: 600 parts water, 50 parts polyvinyl alcohol with a degree of alcoholysis of 98 to 100, 8 parts phosphoric acid, 8 parts formaldehyde, 20 parts urea, 3 parts boric acid, 10 parts BD-168 cross-linking water-resistant agent, 3 parts kason, 20 parts magnesium chloride, 50 parts calcium chloride, and an appropriate amount of ammonia water adjusted to a pH value of 6.

[0025] This embodiment also provides a method for preparing an antifreeze and water-resistant paper product adhesive with excellent performance, comprising the following steps:

[0026] (1) Add 50% of the total water into the reactor, add polyvinyl alcohol with a degree of alcoholysis of 98-100 under stirring, raise the temperature to 95-98°C, keep the temperature for 2 hours, and then cool down to 90-92°C;

[0027] (2) Add phosphoric acid in the formula while stirring at a constant speed, adjust the pH value to 2-3, then add formaldehyde, keep the temperature at 90-92°C for 4-5 hours, then add urea and react for about 30 minutes (30±3 minutes);

[0028] (3) Add 40% of the total water volume of cold water under uniform stirring, wait until the temperature drops below 50°C, dissolve the boric acid in the formula with 10% of the total water volume of warm water, slowly add it to the reactor, then add the BD-168 cross-linking water-resistant agent in the formula, and continue stirring the cross-linking reaction for about 1 hour;

[0029] (4) Dissolve magnesium chloride and calcium chloride in appropriate amounts of water and add them to a reaction kettle, add the kasson in the formula ratio, and then adjust the pH value to 6 with appropriate amounts of ammonia water to obtain an antifreeze and water-resistant paper product adhesive with excellent performance.

[0030] The technical indicators of the products prepared in this embodiment are shown in the following table:

[0031] Table 1 Technical indicators of the antifreeze and water-resistant paper product adhesive prepared in Example 1:

[0032] According to Table 1, all indicators of the antifreeze and water-resistant paper product adhesive prepared in Example 1 meet the requirements of the standard, and the bonding speed is faster than the bonding speed required by the standard.

[0033] Embodiment 2

[0034] The invention discloses an antifreeze and water-resistant paper product adhesive with excellent performance. The mass ratio of each component is as follows: 800 parts of water, 80 parts of polyvinyl alcohol with an alcoholysis degree of 98-100, 12 parts of phosphoric acid, 14 parts of formaldehyde, 40 parts of urea, 4 parts of boric acid, 16 parts of BD-168 cross-linking water-resistant agent, 3 parts of kason, 50 parts of magnesium chloride, 60 parts of calcium chloride, and a proper amount of ammonia water to adjust the pH value to 5.5.

[0035] This embodiment also provides a method for preparing an antifreeze and water-resistant paper product adhesive with excellent performance, comprising the following steps:

[0036] (1) Add 50% of the total water into the reactor, add polyvinyl alcohol with a degree of alcoholysis of 98-100 under stirring, raise the temperature to 95-98°C, keep the temperature for 2 hours, and then cool down to 90-92°C;

[0037] (2) Add phosphoric acid in the formula while stirring at a constant speed, adjust the pH value to 2-3, then add formaldehyde, keep the temperature at 90-92°C for 4-5 hours, then add urea and react for about 30 minutes (30±3 minutes);

[0038] (3) Add 40% of the total water volume of cold water under uniform stirring, wait until the temperature drops below 50°C, dissolve the boric acid in the formula with 10% of the total water volume of warm water, slowly add it to the reactor, then add the BD-168 cross-linking water-resistant agent in the formula, and continue to stir the cross-linking reaction for about 1 hour (60±5 minutes);

[0039] (4) Dissolve magnesium chloride and calcium chloride in appropriate amounts of water and add them to a reaction kettle, add kasson in the formula ratio, and then adjust the pH value to 5.5 with appropriate amounts of ammonia water to obtain an antifreeze and water-resistant paper product adhesive with excellent performance.

[0040] The technical indicators of the product prepared in this embodiment are shown in Table 2 below:

[0041] Table 2:

[0042]

[0043] According to Table 2, all indicators of the antifreeze and water-resistant paper product adhesive prepared in Example 2 meet the standard requirements, and the bonding speed is faster than the bonding speed required by the standard. Compared with Example 1, the product prepared in this example has higher viscosity and solid content, which means that compared with the product prepared in Example 1, the antifreeze and water-resistant paper product adhesive prepared in this example has better bonding strength and durability, and the drying speed is also faster than the product prepared in Example 1.

[0044] Embodiment 3

[0045] The invention discloses an antifreeze and water-resistant paper product adhesive with excellent performance. The mass ratio of each component is as follows: 800 parts of water, 100 parts of polyvinyl alcohol with an alcoholysis degree of 98-100, 15 parts of phosphoric acid, 15 parts of formaldehyde, 50 parts of urea, 5 parts of boric acid, 25 parts of BD-168 cross-linking water-resistant agent, 3 parts of kason, 100 parts of magnesium chloride, 100 parts of calcium chloride, and a proper amount of ammonia water with the pH value adjusted to 5.

[0046] This embodiment also provides a method for preparing an antifreeze and water-resistant paper product adhesive with excellent performance, comprising the following steps:

[0047] (1) Add 50% of the total water into the reactor, add polyvinyl alcohol with a degree of alcoholysis of 98-100 under stirring, raise the temperature to 95-98°C, keep the temperature for 2 hours, and then cool down to 90-92°C;

[0048] (2) Add phosphoric acid in the formula while stirring at a constant speed, adjust the pH value to 2-3, then add formaldehyde, keep the temperature at 90-92°C for 4-5 hours, then add urea and react for about 30 minutes (30±3 minutes);

[0049] (3) Add 40% of the total water volume of cold water under uniform stirring, wait until the temperature drops below 50°C, dissolve the boric acid in the formula with 10% of the total water volume of warm water, slowly add it to the reactor, then add the BD-168 cross-linking water-resistant agent in the formula, and continue to stir the cross-linking reaction for about 1 hour (60±5 minutes);

[0050] (4) Dissolve magnesium chloride and calcium chloride in appropriate amounts of water and add them to a reaction kettle, add the kasson in the formula ratio, and then adjust the pH value to 5 with appropriate amounts of ammonia water to obtain an antifreeze and water-resistant paper product adhesive with excellent performance.

[0051] The technical indicators of the product prepared in this embodiment are shown in Table 3 below:

[0052] Table 3:

[0053]

[0054] According to Tables 1 to 3, in the three embodiments, the products prepared in the three embodiments all meet the requirements of the standards, have good antifreeze properties, and are suitable for bonding at room temperature. The ingredient ratios and preparation processes of the three embodiments result in a relatively low preparation cost. Among them, the product prepared in Example 3 has the highest viscosity and solid content, and the fastest bonding speed, followed by the product prepared in Example 2, and the product prepared in Example 1 has the relatively lowest product viscosity and solid content, and the slowest bonding speed (but meets the requirements of the standards). The product prepared in Example 3 is more suitable for use in situations where quick drying and high-strength bonding are more required; the product prepared in Example 1 is more suitable for use in situations where good fluidity and deeper penetration are more required; the product prepared in Example 2 is more suitable for use in situations where a balance between fluidity and deeper penetration goals as well as quick drying and high-strength bonding goals is required.

[0055] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. Antifreeze and water-resistant paper product adhesive, characterized in that The mass ratio of each component is: water 600-1000, polyvinyl alcohol with a degree of alcoholysis of 98-100 50-100, phosphoric acid 8-15, formaldehyde 8-15, urea 3-50, boric acid 3-5, BD-168 cross-linking water-resistant agent 5-25, Kathon 1-3, magnesium chloride 0-100, calcium chloride 0-100 and ammonia water adjusted to a pH value of 5-7 in an appropriate amount.

2. The method for preparing the antifreeze and water-resistant paper product adhesive according to claim 1, characterized in that Follow these steps: (1) Add 50% of the total water into the reactor, add polyvinyl alcohol with a degree of alcoholysis of 98-100 under stirring, raise the temperature to 95-98°C, keep the temperature for 2 hours, and then cool down to 90-92°C; (2) Add phosphoric acid in the formula while stirring at a constant speed, adjust the pH value to 2-3, then add formaldehyde, keep the temperature at 90-92°C for 4-5 hours, then add urea and react for 30 minutes; (3) Add 40% of the total water volume of cold water under uniform stirring, wait until the temperature drops below 50°C, dissolve the boric acid in the formula with 10% of the total water volume of warm water, slowly add it to the reactor, then add the BD-168 cross-linking water-resistant agent in the formula, and continue to stir the cross-linking reaction for 1 hour; (4) According to the antifreeze requirement, magnesium chloride and calcium chloride are dissolved in water and added into the reaction kettle, and the kasson in the formula ratio is added, and then the pH value is adjusted to 5-7 with appropriate amount of ammonia water to obtain an antifreeze and water-resistant paper product adhesive.

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