CN1276149C

CN1276149C - Denatured fiber and its producing method

Info

Publication number: CN1276149C
Application number: CN 200410060428
Authority: CN
Inventors: 钱富生
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-27
Filing date: 2004-07-27
Publication date: 2006-09-20
Anticipated expiration: 2024-07-27
Also published as: CN1587515A

Abstract

The present invention relates to a denatured fiber and a producing method thereof, which can effectively solve the problems of high papermaking cost and environment pollution. The solving technical scheme is to soak fibers in alkyl ketene dimer solution to produce the denatured fiber. The producing method of the denatured fiber comprises the following steps: alkyl ketene dimer is dissolved in the solvent of benzene and toluene to prepare alkyl ketene dimer mixed solution; then, after pulverization and filter pressing into blocks, fiber slurry boards are soaked in the mixed solution; after soaked at moderate temperature for certain time, the fiber slurry boards are dried in a vacuum state in order to make the alkyl ketene dimer remain in the fibers to form the denatured fiber. The present invention has the advantages of simple method and low cost. The denatured fiber as a sizing agent of papermaking can greatly reduce papermaking production cost and can reduce the loads of waste water treatment and environment pollution, and therefore, the denatured fiber is a great invention and a creative contribution to paper industry, is popularized and is beneficial to the nation and people.

Description

A kind of production method of modified fibre

One, technical field

The present invention relates to the production method of a kind of modified fibre that paper industry uses.

Two, background technology

Various paper be people live and produce in requisite, as package paper, cultural paper, extraordinary with paper or the like, because being extensive use of of paper, paper-making industry just is distributed in the whole world, China is paper production big country especially, but because the sizing agent rosin and the aluminum sulfate that use in the papermaking are acidity, therefore, paper production is serious to the pollution of environment, the life that acid waste water after particularly string being handled and waste material thing thereof are given people, production causes and seriously influences, have to be forced to stop production or close because of can't resolve the pollution to ecological environment in the paper mill that has, even solved the pollution to environment, its cost also is high, the papermaking cost has improved greatly, and this is as good as the expense that has increased consumption, and this is all unfavorable in sending out in state, therefore, how effectively solving in the paper the pollution of environment, reduce production costs again, is the paper-making industry problem demanding prompt solution.

Three, summary of the invention

At above-mentioned situation, the present invention's purpose just provides a kind of production method of modified fibre, modified fibre is as new neutral sizing agent, can effectively solve the reduction of production cost, reduce the paper-making water treatment load and reduce the pollution problem of papermaking environment, the technical scheme of its solution is, modified fibre (is called for short AKD wax by the alkyl ketene dimer of fiber and immersion thereof, as follows) constitute, its production method is, alkyl ketene dimer is dissolved in the solvent that is made of benzene and toluene, making mass concentration is the alkyl ketene dimer mixed solution of 3-4%, the pulpboard that will shred the fiber press filtration one-tenth of (or pulverizing) again is immersed in the alkyl ketene dimer mixed solution, through after certain hour and proper temperature immersion, carry out vacuumize, alkyl ketene dimer immerses in the fiber, thereby generate (AKD) modified fibre, production method of the present invention is simple, cost is low, as neutral glue used in paper-making, can reduce the paper cost greatly, minimizing is to the processing load and the environmental pollution of waste water, be a big invention and a creative contribution, promote the use of, benefit the nation and the people paper-making industry.

Four, the specific embodiment

Below in conjunction with concrete condition the specific embodiment of the present invention is elaborated.

By preceding described, modified fibre of the present invention is to constitute by immersing alkyl ketene dimer in the fiber, its production method is, alkyl ketene dimer is dissolved in the solvent of being made up of the benzene 80% and the toluene 20% of weight meter, constituting mass concentration is the alkyl ketene dimer mixed solution of 3-4%, with fiber (former wood pulp, straw pulp, primary fibers such as bamboo pulp or used once wood pulp, straw pulp, secondary stocks such as bamboo pulp) be crushed to 2-5mm (millimeter), press filtration become each 40-50cm of length and width (centimetre), the block pulpboard of thick 3-5cm, be immersed in and (promptly soak fully, general benzene and toluene mixed solvent requirement are 4: 1 with fibre weight, promptly 400 gram benzene and toluene mixed solvents can immerse the fiber of 100 gram weight) in the alkyl ketene dimer mixed solution of 3-4%, under 20-30 ℃ temperature, soaked 30-40 minute, under 50-55 ℃ temperature, carry out vacuumize then, when making the benzene and the toluene mixed solvent rate of recovery reach 97-98%, the dry end, alkyl ketene dimer is stayed in the fiber admittedly, thereby constitutes (AKD) modified fibre.

In order to reduce production costs, fiber adopts secondary stock among the present invention, producing 1000kg (a ton) modified fibre with the wood pulp secondary stock is example, concrete production method is as follows: alkyl ketene dimer 40kg is dissolved in the composite solvent of toluene by the benzene of 3200kg and 800kg, wood pulp secondary stock 1000kg is crushed to 3mm length, press filtration becomes each 50cm of length and width, the block pulpboard of thick 5cm, be soaked in benzene fully, in the mixed solution of toluene and alkyl ketene dimer, under 25 ℃ temperature, soaked 30 minutes, place the dry liquid recover, 55 ℃ of following vacuumizes, when solvent recovery when the 3920kg, stop drying, modified fibre of the present invention.

The technology of producing modified fibre with other secondary fiber of paper pulp such as straw pulp, bamboo pulp is identical, enumerates no longer one by one.

When modified fibre of the present invention uses in papermaking, as sizing agent, its pulverizing stirred be distributed in the paper pulp, because the effect of fiber self can be twined with other fibers in the paper pulp, when paper pulp is heated to 60-105 ℃ of temperature, fracture takes place and combines with cellulosic hydroxy in the lactone ring of AKD wax (O-C-O), make fiber produce esterification, and be fixed in fiber., thus reach applying glue purpose in the papermaking.

Modified fibre is a kind of neutral sizing agent of paper grade (stock), be used for substituting acid accumulator size, therefore in paper, can be issued to the applying glue purpose in neutral Papermaking Conditions, thereby effectively avoided applying glue under the acid condition to give load that paper-making water treatment brings and to pollution that environment caused, owing to be the modified fibre that adopts secondary stock to make, cost reduces greatly, and modified fibre solvent production, need not other retentions, can reach AKD wax and keep purpose in fiber, production process can be sealed, and solvent recovering rate reaches 97-98%, and is reusable, production method is simple, convenience and small investment, the efficient height can large-scale production.The present invention is that one in the paper invented greatly, and huge economic and social benefit is arranged.

Claims

1, a kind of production method of modified fibre, it is characterized in that, alkyl ketene dimer is dissolved in the solvent of being made up of the benzene 80% and the toluene 20% of weight meter, and constituting mass concentration is the alkyl ketene dimer mixed solution of 3-4%, fiber is pulverized press filtration become pulpboard, be immersed in the mixed solution, soaked 30-40 minute under 20-30 ℃ temperature, vacuumize under 50-55 ℃ temperature then is when making the benzene and the toluene mixed solvent rate of recovery reach 97-98%, the dry end, modified fibre.

2, the production method of a kind of modified fibre according to claim 1 is characterized in that, alkyl ketene dimer 40kg is dissolved in the composite solvent of toluene by the benzene of 3200kg and 800kg, it is long that wood pulp secondary stock 1000kg is ground into 3mm, press filtration becomes each 50cm of length and width, and the block pulpboard of thick 5cm is soaked in the mixed solution fully, soaked 30 minutes down at 25 ℃, place the dry liquid recover, 55 ℃ of following vacuumizes, when solvent recovery arrives 3920kg, stop drying, get final product.