A method for preparing a yarn tube base paper interlayer bonding strength enhancer

Abstract

A kind of yarn tube raw paper interlayer bonding strength enhancer and preparation method thereof, it is characterized in that, raw material includes the following weight fraction components:0.15-0.25 parts of hemicellulose, 0.15-0.25 parts of starch, 0.05-0.1 parts of cation etherification agent, 0.001-0.005 parts of polyaldehyde, 0.02-0.04 parts of basic substance, 0.02-0.04 parts of catalyst, 0.6-0.7 parts of water.The component structure of the enhancer contains a large number of natural polymer, after modification contains rich hydroxyl, aldehyde group, carboxyl, cation, can enhance the combination between fiber hydroxyl, improve the retention of spray glue in paper, so as to improve the interlayer bonding strength of paper, ring pressure strength, breaking, folding resistance and other dry strength, at the same time, it can also reduce the dependence on edible starch, reduce the food crisis.

Description

Technical Field

[0001] This invention relates to the field of papermaking technology, specifically to a method for preparing an interlayer bonding strength enhancer for yarn tube base paper. Background Technology

[0002] With the dwindling supply of non-renewable resources such as oil and coal, the conversion of agricultural and forestry waste into renewable resources to obtain new materials, high-calorific-value energy, chemical raw materials, and pharmaceuticals is becoming an important development trend. Although agricultural and forestry waste renewable resources contain a large number of natural polymers, their complex structures limit their industrial applications, thus requiring further modification for utilization.

[0003] Due to the low cost and ease of recycling of paper tubes, yarn tube base paper, as one of the main materials for paper tube production, is finding increasingly wider applications, including in the papermaking, packaging, and film packaging industries. The basis weight of yarn tube paperboard ranges from 81-510 g / m³. 2 It is tough, wear-resistant, smooth, and uniform, with good water resistance. However, in the past two years, due to the ban on solid waste imports, the fiber raw materials of paper mills using waste paper as raw material have become increasingly inferior. At the same time, as more and more manufacturers add papermaking sludge and wood chips, the quality of white water has also deteriorated, leading to a decrease in paper interlayer bond strength, ring crush strength, and bursting strength. Therefore, a large amount of reinforcing agents are needed to compensate for the loss of paper strength. In the past, interlayer sprayed starch was often used as an interlayer reinforcing agent, but the retention of sprayed starch in the paper sheet has a significant impact on the interlayer bond strength.

[0004] Therefore, this invention addresses the shortcomings of existing resource utilization and reinforcing agent technology by providing a method for preparing an interlayer bonding strength enhancer for yarn tube base paper. This reinforcing agent contains a large number of natural polymers in its component structure, and after modification, it is rich in hydroxyl, aldehyde, carboxyl, and cation groups. This enhances the bonding between fiber hydroxyl groups, improves the retention of sprayed adhesive in the paper sheet, thereby increasing the paper's interlayer bonding strength, ring crush strength, burst strength, folding endurance, and other dry strengths. Simultaneously, it can reduce reliance on edible starch and mitigate the food crisis. Summary of the Invention

[0005] The problem this invention aims to solve is to use renewable, non-toxic, and harmless non-edible natural polymers to replace a portion of edible starch in order to prepare a non-toxic and harmless reinforcing agent. This reinforcing agent can be comparable in performance to commercially available starch reinforcing agents, and can improve the basis weight of paper to a certain extent without reducing other strengths of the paper.

[0006] The present invention solves the above-mentioned technical problems by adopting the following technical solutions.

[0007] A method for preparing an interlayer bonding strength enhancer for yarn tube base paper, wherein the raw materials include the following components in parts by weight: 0.15-0.25 parts hemicellulose, 0.15-0.25 parts starch, 0.05-0.1 parts cationic etherifying agent, 0.001-0.005 parts polyaldehyde, 0.02-0.04 parts alkaline substance, 0.02-0.04 parts catalyst, and 0.6-0.7 parts water;

[0008] The specific steps include:

[0009] (1) Hemicellulose and some starch are added to a certain amount of water to obtain material A;

[0010] (2) Add some alkaline substance to material A, add cationic etherifying agent at a certain temperature, react for a certain time, and obtain material B;

[0011] (3) Add catalyst and polyaldehyde to material B, react at a certain temperature for a certain time to obtain material C;

[0012] (4) Add the remaining alkaline substance to material C and carry out a neutralization reaction at a certain temperature to obtain yellow liquid enhancer D;

[0013] (5) Add the remaining starch to material D and mix evenly to obtain the interlayer bonding strength enhancer of yarn tube base paper.

[0014] Preferably, the molecular weight of the hemicellulose is 20,000 to 50,000.

[0015] Preferably, the starch includes one or more of cassava starch, corn starch, potato starch, and wheat starch.

[0016] Preferably, the cationic etherifying agent comprises 3-chloro-2-hydroxypropyl-trimethylammonium chloride.

[0017] Preferably, the multi-component aldehyde includes one or more of glutaraldehyde, succinal, and glyoxal; compared with formaldehyde, multi-component aldehydes can polymerize molecules at both ends, allowing the molecules to be larger, and multi-component aldehydes are more environmentally friendly than formaldehyde.

[0018] Preferably, the alkaline substance includes one or more of sodium hydroxide, calcium hydroxide, magnesium hydroxide, and potassium hydroxide.

[0019] Preferably, the catalyst comprises one or more of organic acids and inorganic acids;

[0020] More preferably, the organic acid includes one or more of acetic acid, citric acid, tartaric acid, and oxalic acid; and the inorganic acid includes one or more of sulfuric acid and hydrochloric acid.

[0021] Preferably, in step (1), the amount of starch added is 4-20% of the total starch content; the starch is added in steps, which can control the viscosity of the entire sample and prevent the nozzles of the sprayer from being clogged due to excessive viscosity during production.

[0022] Preferably, in step (2), the amount of alkaline substance added is 50-85% of the total amount of alkaline substance.

[0023] Preferably, in step (2), the temperature is 70-90℃ and the reaction time is 3-5h.

[0024] Preferably, in step (3), the reaction temperature is 60-90℃ and the reaction time is 1-2h.

[0025] Preferably, in step (4), the temperature is 25-35℃.

[0026] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0027] The reagents and raw materials used in this invention are all commercially available.

[0028] The positive and progressive effects of this invention are as follows: This invention mainly uses the aldol condensation reaction of hemicellulose cationization with aldehydes to produce a yarn tube base paper interlayer bonding strength enhancer. The main raw material is a widely renewable natural polymer, which can achieve efficient resource utilization and turn waste into treasure. Natural polymers are inexpensive, readily available, and in ample supply. The yarn tube base paper interlayer bonding strength enhancer made by combining natural polymers with other raw materials has a relatively simple raw material formula and simple and easy-to-operate preparation steps. When the yarn tube base paper interlayer bonding strength enhancer is used for paper spraying, it can effectively improve the bonding force and ring crush value, and improve the basis weight of the paper to a certain extent without reducing the other physical strengths of the paper. Detailed Implementation

[0029] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0030] Example 1

[0031] A method for preparing an interlayer bonding strength enhancer for yarn tube base paper specifically includes the following steps:

[0032] (1) Take 75g of hemicellulose (molecular weight of 20,000) and 5g of corn starch, add 300g of water and stir to disperse evenly to obtain material A;

[0033] (2) Add 5.5g of sodium hydroxide to material A, add 25g of 3-chloro-2-hydroxypropyl-trimethylammonium chloride at 90℃, react for 3h to obtain material B;

[0034] (3) Add 10g hydrochloric acid and 0.5g glutaraldehyde to material B, and react at 60℃ for 1h to obtain material C;

[0035] (4) Add 4.9g of sodium hydroxide to material C and carry out a neutralization reaction at 30℃ to prepare a yellow liquid reinforcing agent D;

[0036] (5) Add 75g of cassava starch to material D and mix evenly to obtain a bonding strength enhancer for the interlayer of the yarn tube base paper.

[0037] Example 2

[0038] A method for preparing an interlayer bonding strength enhancer for yarn tube base paper specifically includes the following steps:

[0039] (1) Take 100g of hemicellulose (molecular weight of 50,000) and 10g of tapioca starch, add 350g of water and stir to disperse evenly to obtain material A;

[0040] (2) Add 10.2g of potassium hydroxide to material A, add 40g of 3-chloro-2-hydroxypropyl-trimethylammonium chloride at 80℃, react for 4h to obtain material B;

[0041] (3) Add 10g of sulfuric acid and 2.0g of glyoxal to material B, and react at 80℃ for 2h to obtain material C;

[0042] (4) Add 2.3g of sodium hydroxide to material C and carry out a neutralization reaction at 30℃ to obtain yellow liquid reinforcing agent D;

[0043] (5) Add 115g of cassava starch to material D and mix evenly to obtain a bonding strength enhancer for the interlayer of the yarn tube base paper.

[0044] Example 3

[0045] A method for preparing an interlayer bonding strength enhancer for yarn tube base paper specifically includes the following steps:

[0046] (1) Take 125g of hemicellulose (molecular weight of 50,000) and 5g of corn starch, add 350g of water and stir to disperse evenly to obtain material A;

[0047] (2) Add 7g of sodium hydroxide to material A, add 50g of 3-chloro-2-hydroxypropyl-trimethylammonium chloride at 90℃, react for 3h to obtain material B;

[0048] (3) Add 15g of citric acid and 1.5g of succinaldehyde to material B, and react at 80℃ for 2h to obtain material C;

[0049] (4) Add 5.2g of potassium hydroxide to material C and carry out a neutralization reaction at 25℃ to prepare a yellow liquid reinforcing agent D;

[0050] (5) Add 120g of starch to material D and mix evenly to obtain a yarn tube base paper interlayer bonding strength enhancer.

[0051] Example 4

[0052] A method for preparing an interlayer bonding strength enhancer for yarn tube base paper specifically includes the following steps:

[0053] (1) Take 75g of hemicellulose (molecular weight of 50,000) and 15g of corn starch, add 300g of water and stir to disperse evenly to obtain material A;

[0054] (2) Add 12g of triethylamine to material A, add 30g of 3-chloro-2-hydroxypropyl-trimethylammonium chloride at 90℃, react for 3h to obtain material B;

[0055] (3) Add 10g of acetic acid and 0.5g of glutaraldehyde to material B, and react at 60℃ for 1h to obtain material C;

[0056] (4) Add 4.9g of sodium hydroxide to material C and carry out a neutralization reaction at 35℃ to obtain yellow liquid reinforcing agent D;

[0057] (5) Add 75g of cassava starch to material D and mix evenly to obtain a bonding strength enhancer for the interlayer of the yarn tube base paper.

[0058] Comparative Example 1

[0059] Compared with Example 1, the difference is that hemicellulose is not added in step (1), while other conditions and parameters are the same as in Example 1.

[0060] Comparative Example 2

[0061] Compared with Example 1, the difference is that 3-chloro-2-hydroxypropyl-trimethylammonium chloride is not added in step (2), while other conditions and parameters are the same as in Example 1.

[0062] Comparative Example 3

[0063] Compared with Example 1, the difference is that glutaraldehyde is not added in step (3), while other conditions and parameters are the same as in Example 1.

[0064] Comparative Example 4

[0065] Compared with Example 1, the difference is that no alkali is added in step (4), while other conditions and parameters are the same as in Example 1.

[0066] Comparative Example 5

[0067] Compared with Example 1, the difference is that tapioca starch is not added in step (5), while other conditions and parameters are the same as in Example 1.

[0068] Comparative Example 6

[0069] Compared with Example 1, the difference is that hemicellulose in step (1) is replaced with lignin, while other conditions and parameters are the same as in Example 1.

[0070] Implementation effect

[0071] Weigh out a fixed amount of top pulp, form it into sheets, and transfer it to absorbent paper for later use; add 10 ppm purple dye to the bottom pulp, form it into sheets; use the prepared top pulp paper sample to transfer the bottom pulp paper sample, and after pressing, drying, and balancing the moisture, test the interlayer bonding strength and ring crush. The amount of reinforcing agent is 3%, and the number of layers is 4.

[0072] All paper samples were dried and equilibrated using a varnishing machine (set to 150℃, actual measured temperature around 110℃), then weighed and measured for internal bond strength, ring crush, and folding endurance. The interlayer bond strength was measured using an IBT interlayer bond strength tester; the paper bursting index was measured using a BSM-1600 paper bursting strength tester.

[0073] The control sample was commercially available sprayed starch.

[0074] Table 1

[0075]

[0076]

[0077] The data in Table 1 show that the interlayer bond strength enhancers of yarn tube base paper prepared in Examples 1-4 can effectively improve the ring crush index, internal bond strength, and bursting index compared with the interlayer bond strength enhancers of yarn tube base paper prepared in Comparative Examples 1-6.

[0078] The above are merely preferred embodiments of the present invention. Those skilled in the art should understand that the present invention is not limited to these embodiments. The embodiments and descriptions in the specification are merely the principles of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing an interlayer bonding strength enhancer for yarn tube base paper, characterized in that, Its raw materials include the following components in parts by weight: 0.15-0.25 parts hemicellulose, 0.15-0.25 parts starch, 0.05-0.1 parts cationic etherifying agent, 0.001-0.005 parts polyaldehyde, 0.02-0.04 parts alkaline substance, 0.02-0.04 parts catalyst, and 0.6-0.7 parts water; The specific preparation steps include: (1) Hemicellulose and a portion of starch are added to a certain amount of water to obtain material A, wherein the amount of starch added is 4-20% of the total mass of starch. (2) Add a portion of alkaline substance to material A, add a cationic etherifying agent at 70-90℃, react for 3-5 hours to obtain material B. The amount of alkaline substance added is 50-85% of the total mass of alkaline substance. (3) Add catalyst and polyaldehyde to material B and react at 60-90℃ for 1-2 hours to obtain material C; (4) Add the remaining alkaline substance to material C and carry out a neutralization reaction at 25-35℃ to prepare yellow liquid reinforcing agent D; (5) Add the remaining starch to the yellow liquid reinforcing agent D and mix evenly to obtain the interlayer bonding strength reinforcing agent of yarn tube base paper.

2. The method for preparing a yarn tube base paper interlayer bonding strength enhancer as described in claim 1, characterized in that, The molecular weight of the hemicellulose is 20,000 to 50,000.

3. The method for preparing a yarn tube base paper interlayer bonding strength enhancer as described in claim 1, characterized in that, The starch includes one or more of the following: cassava starch, corn starch, potato starch, and wheat starch.

4. The method for preparing a yarn tube base paper interlayer bonding strength enhancer as described in claim 1, characterized in that, The cationic etherifying agent includes 3-chloro-2-hydroxypropyl-trimethylammonium chloride.

5. The method for preparing a yarn tube base paper interlayer bonding strength enhancer as described in claim 1, characterized in that, The polyaldehydes include one or more of glutaraldehyde, succinal, and glyoxal.

6. The method for preparing a yarn tube base paper interlayer bonding strength enhancer as described in claim 1, characterized in that, The alkaline substance includes one or more of sodium hydroxide, calcium hydroxide, magnesium hydroxide, and potassium hydroxide.

7. The method for preparing a yarn tube base paper interlayer bonding strength enhancer as described in claim 1, characterized in that, The catalyst includes one or more of organic acids and inorganic acids; The organic acids include one or more of acetic acid, citric acid, tartaric acid, and oxalic acid; The inorganic acid includes one or more of sulfuric acid and hydrochloric acid.

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