CN109577087B

CN109577087B - Multifunctional composite reinforcing agent for papermaking and preparation method thereof

Info

Publication number: CN109577087B
Application number: CN201811535747.1A
Authority: CN
Inventors: 陈雁南; 吴萌; 曾红; 薛广海; 罗彤彤; 王瑀辉
Original assignee: BGRIMM Technology Group Co Ltd
Current assignee: BGRIMM Technology Group Co Ltd
Priority date: 2018-12-14
Filing date: 2018-12-14
Publication date: 2021-09-14
Anticipated expiration: 2038-12-14
Also published as: CN109577087A

Abstract

The invention discloses a multifunctional composite reinforcing agent for papermaking and a preparation method thereof, wherein the composite reinforcing agent comprises the following raw materials in parts by weight: 60-80% of reinforcing component, 10-20% of dispersing component and 10-20% of retention component. The enhancing component is one or two of guar gum and locust bean gum. The dispersing component is one or more of hydroxyethyl cellulose, methyl cellulose and carboxymethyl cellulose. The retention component is any one or more of polyethylene oxide and polyvinyl alcohol. Weighing the raw materials in proportion, and placing the raw materials in a stirring tank for mixing until the raw materials are uniformly mixed. Has better retention effect than other intensifier varieties while having the same intensifying effect, simple and safe production process, convenient and high-efficiency use.

Description

Multifunctional composite reinforcing agent for papermaking and preparation method thereof

Technical Field

The invention relates to a papermaking additive, in particular to a multifunctional composite reinforcing agent for papermaking and a preparation method thereof.

Background

With the rapid development of the paper making industry, the paper machine speed is continuously improved, the environmental protection pressure of white water treatment is gradually increased, and higher requirements are put forward on paper making additives. The increase of the paper strength can reduce the paper breakage and the reduction of the yield caused by paper breakage, and the increase of the retention rate can reduce the increase of the white water conductivity and the raw material loss caused by the anion garbage enrichment.

Guar gum is a galactomannan whose molecular structure is (1,4) -beta-D mannose with a main chain consisting of alpha-D galactose and connected to the main chain by a (1,6) linkage, with every other mannose having a galactose branch, the ratio of mannose to galactose being about 2:1, mainly because of the structural similarity of the cellulose, which is a molecular structural element of guar gum. Therefore, the fibers can be effectively attached to the fibers, the function of the fibers can be fully exerted, and the paper evenness can be improved. The unmodified guar gum and the modified nonionic guar gum can be used as a papermaking reinforcing agent, and the guar gum modified by cations can be used as a papermaking retention aid.

The Chinese patent CN 102329398A multifunctional papermaking guar gum derivative and the preparation method and the application thereof propose that the guar gum derivative which is synthesized by the reaction of an amido nonionic etherifying agent and/or a sulfonate anionic etherifying agent and a cationic etherifying agent with guar gum under the alkaline condition and contains a quaternary ammonium cationic group and an amide nonionic group or a sulfonate anionic group can be used as a retention aid and a filter aid or a reinforcing agent to be applied to the papermaking industry.

The modified guar gum of Chinese patent CN 101210055A, the preparation method thereof and the application thereof in preparing tobacco sheets, and the guar gum derivative prepared by alkalizing, crosslinking and cationizing guar gum has obvious retention and reinforcement effects.

In the prior patents, the performance improvement of guar gum applied to the papermaking industry is mainly performed through chemical modification, and the required process line is long, the introduced groups are many, and the control is not easy.

Disclosure of Invention

The invention aims to provide a multifunctional composite reinforcing agent for papermaking and a preparation method thereof.

The purpose of the invention is realized by the following technical scheme:

the multifunctional composite reinforcing agent for papermaking comprises the following raw materials in parts by weight:

60-80% of reinforcing component, 10-20% of dispersing component and 10-20% of retention component.

Weighing the raw materials in proportion, and placing the raw materials in a stirring tank for mixing until the raw materials are uniformly mixed.

According to the technical scheme provided by the invention, the multifunctional composite reinforcing agent for papermaking and the preparation method thereof are obtained by compounding the reinforcing component, the dispersing component and the retention component. The reinforcing agent not only has the function of improving the tensile strength of paper, but also has the function of increasing the retention rate of the filler, reduces the waste of raw materials in the papermaking process and saves the production cost.

Detailed Description

The embodiments of the present invention will be described in further detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.

The invention relates to a multifunctional composite reinforcing agent for papermaking and a preparation method thereof, and a preferable specific implementation mode is as follows:

the feed comprises the following raw materials in parts by weight:

The reinforcing component is one or a mixture of guar gum and locust bean gum.

The dispersing component is any one or more of hydroxyethyl cellulose, methyl cellulose and carboxymethyl cellulose.

The retention component is any one or more of polyethylene oxide and polyvinyl alcohol.

The guar gum and the locust bean gum are unmodified raw powder, and the molecular weight of the guar gum and the locust bean gum is 200-250 ten thousand.

The molecular weight of the polyoxyethylene is 300-400 ten thousand.

The molecular weight of the polyvinyl alcohol is 15-ten thousand to 20 ten thousand, and the alcoholysis degree is 87-89%.

According to the multifunctional composite reinforcing agent for papermaking and the preparation method thereof, the retention effect of guar gum as the reinforcing agent is improved in a compounding manner, so that the multifunctional composite reinforcing agent for papermaking is formed. The reinforcing agent takes guar gum as a main component, and is compounded with other substances with reinforcing and retention effects, so that the reinforcing agent has a retention effect superior to other reinforcing agent varieties while having the same reinforcing effect, and the reinforcing agent is simple and safe in production process, convenient and efficient to use.

The inventor repeatedly screens the auxiliary agents with the enhancement effect and the retention effect, evaluates the application performance of the compound product in a handsheet form, repeatedly compares test results, and finally determines the types and the dosage of the auxiliary agents. Wherein, the guar gum is taken as a reinforcing agent and accounts for the main component, polyvinyl alcohol and carboxymethyl cellulose which have the same reinforcing effect are compounded, and polyethylene oxide with retention effect is compounded at the same time.

The proportions of the components are as follows:

the reinforcing component: 60 to 80 percent

Dispersing components: 10 to 20 percent

Retention components: 10 to 20 percent

The above materials are mixed uniformly by mechanical stirring, wherein the enhancing component is one or mixture of guar gum and locust bean gum. The dispersing component is one or more of hydroxyethyl cellulose, methyl cellulose and carboxymethyl cellulose. The retention component is one or more of polyethylene oxide and polyvinyl alcohol.

Evaluation of application Performance

1. Slurry preparation

Pulping according to the standard requirement of a Walli pulping machine method in a QB/T3702-1999 laboratory, wherein the pulping degrees of the bleached softwood chemical pulp and the bleached hardwood chemical pulp are respectively 80 DEG SR and 20 DEG SR, and the bleached hardwood chemical pulp and the unbleached hardwood chemical pulp are mixed according to the proportion of absolute dry pulp of 1: 1;

2. paper sheet making

According to the pulp mixing sequence: pulp → calcium carbonate (PCC) → starch (cationic starch) → papermaking strength agent, and handsheets were made in an automatic sheet former, the handsheets having a basis weight (30g/m2), wherein calcium carbonate, starch, and papermaking strength agent accounted for 30%, 0.7%, and 0.6% by mass of the paper in this order (additive amount to absolutely dry fibers, on a dry basis).

3. Detecting the index

Retention, tensile strength, opacity, wherein retention is calculated as the percentage of filler contained in the paper to the amount of filler added to the stock, and tensile strength is measured according to the corresponding national standard.

The effect of different raw material ratios on retention and enhancement properties is shown in Table 1

TABLE 1 Effect of different raw material ratios on retention and enhancement Properties

Numbering	1	2	3	4
					Reinforcing component%	100	80	72	70
Dispersed component%	0	10	13	12
					Retention aid component%	0	10	15	18
Retention rate%	45.48	48	51	56.76
					Tensile strength cN/30mm	3224	3574	3842	3321

From the above table, it can be seen that the retention components have a significant effect on the retention effect, with the retention increasing with increasing amounts. The tensile strength of the paper has a certain degree of increase by the compounding use of the dispersing component and the reinforcing component. Compared with a guar gum product which is singly used, the compound guar gum product has the advantages that the reinforcing performance and the retention performance are improved.

The specific embodiment is as follows:

example one

A multifunctional composite reinforcing agent for papermaking comprises the following raw materials in percentage by weight: 80% of guar gum, 10% of carboxymethyl cellulose, 5% of polyethylene oxide and 5% of polyvinyl alcohol.

The preparation method comprises the following steps: the raw material components are uniformly mixed according to the weight ratio requirement.

The using method comprises the following steps: weighing a sample according to the concentration of 0.5 percent of the solution, dissolving the sample in cold water, then heating to 65 ℃ to completely dissolve the sample, and adding the sample into the slurry according to the actual dosage condition after dissolving.

Example two

A multifunctional composite reinforcing agent for papermaking comprises the following raw materials in percentage by weight: guar gum 62%, locust bean gum 10%, methyl cellulose 5%, hydroxyethyl cellulose 8%, and polyethylene oxide 15%.

EXAMPLE III

A multifunctional composite reinforcing agent for papermaking comprises the following raw materials in percentage by weight: 70% of guar gum, 7% of carboxymethyl cellulose, 5% of hydroxyethyl cellulose, 10% of polyethylene oxide and 8% of polyvinyl alcohol.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The multifunctional composite reinforcing agent for papermaking is characterized by comprising the following raw materials in parts by weight:

60-80% of reinforcing component, 10-20% of dispersing component and 10-20% of retention component;

the reinforcing component is one or a mixture of guar gum and locust bean gum;

the dispersion component is any one or more of hydroxyethyl cellulose, methyl cellulose and carboxymethyl cellulose;

the retention component is any one or more of polyethylene oxide and polyvinyl alcohol;

the guar gum and the locust bean gum are unmodified raw powder, and the molecular weight of the guar gum and the locust bean gum is 200-250 ten thousand;

the molecular weight of the polyoxyethylene is 300-400 ten thousand;

2. The method for preparing the multifunctional composite reinforcing agent for papermaking as claimed in claim 1, wherein the raw materials are weighed in proportion and placed in a stirring tank for mixing until the raw materials are uniformly mixed.