阅读说明：本技术 一种废纸纤维微纤化的处理工艺 (Treatment process for waste paper fiber microfibrillation ) 是由 李文斌 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种废纸纤维微纤化的处理工艺。包括以下步骤：(1)废纸纤维预处理；(2)再处理；(3)机械磨浆。本发明的处理工艺先采用纤维素酶对废纸浆进行处理,再通过碱和润胀剂对废纸浆进行处理,能够软化纤维,降低后续机械处理的能源消耗；最后采用磨浆工艺对纤维进行机械处理,完成整个微纤化过程。(The invention discloses a treatment process for waste paper fiber microfibrillation. The method comprises the following steps: (1) pretreating waste paper fibers; (2) then processing; (3) and (5) mechanically grinding the pulp. According to the treatment process, the waste paper pulp is treated by adopting the cellulase, and then the waste paper pulp is treated by the alkali and the swelling agent, so that the fibers can be softened, and the energy consumption of subsequent mechanical treatment is reduced; and finally, mechanically treating the fibers by adopting a pulping process to finish the whole microfibrillation process.)

1. A treatment process for waste paper fiber microfibrillation is characterized by comprising the following steps:

(1) waste paper fiber pretreatment: adjusting the pH value of the waste paper pulp to 4-5, keeping the temperature at 30-40 ℃, then adding cellulase, fully stirring and mixing for reaction for 60-80 min;

(2) and (3) retreatment: adding alkali into the waste paper pulp obtained in the step (1), adjusting the pH value to 8-10, then adding a swelling agent, and stirring and mixing for 60-80 min;

(3) mechanical pulping: and (3) adding inorganic particles into the waste paper pulp obtained in the step (2), then placing the waste paper pulp into a pulping machine for pulping, and filtering to obtain the final microfibrillated waste paper fiber.

2. The process of claim 1, wherein the swelling agent comprises the following raw materials in parts by weight: 50-60 parts of sodium chloride, 10-15 parts of sodium sulfite and 1-3 parts of organic silicon.

3. A process for defibrination of waste paper fibers as claimed in claim 1 or 2, wherein the swelling agent is added in an amount of 1-2% by weight based on the weight of the waste paper pulp.

4. The process of claim 1, wherein the cellulase is added in an amount of 0.1 to 0.2% by weight based on the weight of the waste paper pulp.

5. A process for defibrination of waste paper fiber according to claim 1, wherein the alkali is sodium hydroxide, potassium hydroxide or aluminum hydroxide.

6. A process for defibrination of waste paper fiber according to claim 1, wherein said inorganic particles are obtained by the steps of: and (2) placing the silicon dioxide in polyvinyl alcohol for ultrasonic dispersion for 20-30min, then adding acrylic acid, silicone oil and a silane coupling agent, fully stirring and mixing, and filtering to obtain the final inorganic particles.

7. The process of claim 6, wherein the weight portions of the silica are 10 parts, and the other raw materials are respectively as follows: 30-40 parts of polyvinyl alcohol, 10-15 parts of acrylic acid, 20-30 parts of silicone oil and 1-3 parts of silane coupling agent.

Technical Field

The invention relates to a treatment process for waste paper fiber microfibrillation, belonging to the technical field of papermaking.

Background

The recycling of waste paper leads to the reduction of the quality of finished paper, and the use of starch in pulp influences the closed internal circulation of white water and damages the stability of a papermaking system. Compared with the virgin pulp, the fibers in the waste paper pulp undergo irreversible changes such as cutting, stripping, fibrillation and the like because the fibers are subjected to processes such as beating, wet-end dewatering, drying, calendaring and the like.

Mineral fillers are often added in the manufacture of paper. While this may in some cases reduce the mechanical strength of the paper (i.e., relative to paper made from pure fiber pulp), it is tolerable because the mechanical strength (although reduced) is still acceptable and has cost, quality, and environmental benefits as the amount of fiber in the paper can be reduced. A common property used to evaluate the mechanical strength of paper is paper burst strength. Generally, pulp made from pure fiber pulp has higher paper burst strength than comparative paper in which a portion of the fiber pulp is replaced with mineral filler.

Therefore, a treatment process for microfibrillating the waste paper fibers is necessary.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a treatment process for waste paper fiber microfibrillation.

The invention is realized by the following technical scheme:

a treatment process for waste paper fiber microfibrillation comprises the following steps:

(1) waste paper fiber pretreatment: adjusting the pH value of the waste paper pulp to 4-5, keeping the temperature at 30-40 ℃, then adding cellulase, fully stirring and mixing for reaction for 60-80 min;

(2) and (3) retreatment: adding alkali into the waste paper pulp obtained in the step (1), adjusting the pH value to 8-10, then adding a swelling agent, and stirring and mixing for 60-80 min;

(3) mechanical pulping: and (3) adding inorganic particles into the waste paper pulp obtained in the step (2), then placing the waste paper pulp into a pulping machine for pulping, and filtering to obtain the final microfibrillated waste paper fiber.

The treatment process of waste paper fiber microfibrillation comprises the following raw materials in parts by weight: 50-60 parts of sodium chloride, 10-15 parts of sodium sulfite and 1-3 parts of organic silicon.

The processing technology for the microfibrillation of the waste paper fibers is characterized in that the addition amount of the swelling agent is 1-2% of the weight of the waste paper pulp.

The cellulose is added in an amount of 0.1-0.2% of the weight of the waste paper pulp.

The treatment process for the waste paper fiber microfibrillation comprises the step of adding alkali, wherein the alkali is sodium hydroxide, potassium hydroxide or aluminum hydroxide.

The treatment process for the microfibrillation of the waste paper fiber comprises the following steps of: and (2) placing the silicon dioxide in polyvinyl alcohol for ultrasonic dispersion for 20-30min, then adding acrylic acid, silicone oil and a silane coupling agent, fully stirring and mixing, and filtering to obtain the final inorganic particles.

The waste paper fiber microfibrillation treatment process is characterized in that the waste paper fiber microfibrillation treatment process comprises the following raw materials in parts by weight, wherein the silicon dioxide is 10 parts by weight: 30-40 parts of polyvinyl alcohol, 10-15 parts of acrylic acid, 20-30 parts of silicone oil and 1-3 parts of silane coupling agent.

The invention achieves the following beneficial effects:

according to the treatment process, the waste paper pulp is treated by adopting the cellulase, and then the waste paper pulp is treated by the alkali and the swelling agent, so that the fibers can be softened, and the energy consumption of subsequent mechanical treatment is reduced; and finally, mechanically treating the fibers by adopting a pulping process to finish the whole microfibrillation process.

The waste paper fiber is microfibrillated to replace starch or mineral filler in pulp, so that the strength requirement of papermaking can be met, the application range of the waste paper fiber is expanded, the product quality is improved, and the microfibrillation of the waste paper fiber is beneficial to resource recycling and ecological environment protection and has extremely important significance for deep utilization and development of waste paper pulp fiber resources.

Detailed Description

The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1

A treatment process for waste paper fiber microfibrillation comprises the following steps:

(1) waste paper fiber pretreatment: adjusting the pH value of the waste paper pulp to 4-5, keeping the temperature at 30-40 ℃, then adding cellulase, fully stirring and mixing for reaction for 60-80 min;

(2) and (3) retreatment: adding alkali into the waste paper pulp obtained in the step (1), adjusting the pH value to 8-10, then adding a swelling agent, and stirring and mixing for 60-80 min;

(3) mechanical pulping: and (3) adding inorganic particles into the waste paper pulp obtained in the step (2), then placing the waste paper pulp into a pulping machine for pulping, and filtering to obtain the final microfibrillated waste paper fiber.

The swelling agent comprises the following raw materials in parts by weight: 50 parts of sodium chloride, 10 parts of sodium sulfite and 3 parts of organic silicon. The addition amount of the swelling agent is 2% of the weight of the waste paper pulp.

Wherein the addition amount of the cellulase is 0.1 percent of the weight of the waste paper pulp. The alkali is sodium hydroxide, potassium hydroxide or aluminum hydroxide.

The inorganic particles are obtained by the following steps: and (2) placing the silicon dioxide in polyvinyl alcohol for ultrasonic dispersion for 20-30min, then adding acrylic acid, silicone oil and a silane coupling agent, fully stirring and mixing, and filtering to obtain the final inorganic particles. The silica is calculated by 10 parts by weight, and the rest raw materials are respectively: 30 parts of polyvinyl alcohol, 15 parts of acrylic acid, 20 parts of silicone oil and 3 parts of silane coupling agent.

When the microfibrillated waste paper fiber is used, the microfibrillated waste paper fiber can be added into a mixed pulp tank to replace starch, and the tightness of the obtained finished pulp is 0.90g/cm³The burst index is 2.6 kPa.m²(iv)/g, ring pressure index 11 N.m/g; the consumption of starch is reduced by 100 percent, the unit consumption is reduced to 1kg/t of paper, and the annual cost is saved by about 160 ten thousand yuan.

The swelling agent is added to soften the fibers in the waste paper pulp, so that the subsequent pulping treatment is facilitated, and the swelling agent is sodium chloride, sodium sulfite and organic silicon and has a good softening effect.

According to the invention, inorganic particles are added during grinding, so that the grinding effect is better, the inorganic particles take silicon dioxide as a main raw material, then a film is formed on the surface of the silicon dioxide through polyvinyl alcohol dispersion treatment and treatment by using acrylic acid, silicon oil and a silane coupling agent, so that the hydrophobicity of the surface of the silicon dioxide is improved, and therefore, the silicon dioxide does not react in the grinding process and can be removed after grinding is finished.

Example 2

A treatment process for waste paper fiber microfibrillation comprises the following steps:

(1) waste paper fiber pretreatment: adjusting the pH value of the waste paper pulp to 4-5, keeping the temperature at 30-40 ℃, then adding cellulase, fully stirring and mixing for reaction for 60-80 min;

(2) and (3) retreatment: adding alkali into the waste paper pulp obtained in the step (1), adjusting the pH value to 8-10, then adding a swelling agent, and stirring and mixing for 60-80 min;

(3) mechanical pulping: and (3) adding inorganic particles into the waste paper pulp obtained in the step (2), then placing the waste paper pulp into a pulping machine for pulping, and filtering to obtain the final microfibrillated waste paper fiber.

The swelling agent comprises the following raw materials in parts by weight: 60 parts of sodium chloride, 15 parts of sodium sulfite and 1 part of organic silicon. The addition amount of the swelling agent is 1 percent of the weight of the waste paper pulp.

Wherein the addition amount of the cellulase is 0.2 percent of the weight of the waste paper pulp. The alkali is sodium hydroxide, potassium hydroxide or aluminum hydroxide.

The inorganic particles are obtained by the following steps: and (2) placing the silicon dioxide in polyvinyl alcohol for ultrasonic dispersion for 20-30min, then adding acrylic acid, silicone oil and a silane coupling agent, fully stirring and mixing, and filtering to obtain the final inorganic particles. The silica is calculated by 10 parts by weight, and the rest raw materials are respectively: 40 parts of polyvinyl alcohol, 10 parts of acrylic acid, 30 parts of silicone oil and 1 part of silane coupling agent.

When the microfibrillated waste paper fiber is used, the microfibrillated waste paper fiber can be added into a pulp flushing white water tank, is pumped into a screen in front of a screen through a pulp flushing pump to replace part of retention and drainage aids, and the finished paper tightness of the obtained finished paper pulp is 0.70g/cm³The burst index is 2.6 kPa.m²(iv)/g, ring pressure index 9 N.m/g; the dosage of the chemical auxiliary agent is reduced by 10 percent, and the annual cost is saved by about 100 ten thousand yuan.

Example 3

A treatment process for waste paper fiber microfibrillation comprises the following steps:

(1) waste paper fiber pretreatment: adjusting the pH value of the waste paper pulp to 4-5, keeping the temperature at 30-40 ℃, then adding cellulase, fully stirring and mixing for reaction for 60-80 min;

(2) and (3) retreatment: adding alkali into the waste paper pulp obtained in the step (1), adjusting the pH value to 8-10, then adding a swelling agent, and stirring and mixing for 60-80 min;

(3) mechanical pulping: and (3) adding inorganic particles into the waste paper pulp obtained in the step (2), then placing the waste paper pulp into a pulping machine for pulping, and filtering to obtain the final microfibrillated waste paper fiber.

The swelling agent comprises the following raw materials in parts by weight: 54 parts of sodium chloride, 12 parts of sodium sulfite and 2 parts of organic silicon. The addition amount of the swelling agent is 1 percent of the weight of the waste paper pulp.

Wherein the addition amount of the cellulase is 0.2 percent of the weight of the waste paper pulp. The alkali is sodium hydroxide, potassium hydroxide or aluminum hydroxide.

The inorganic particles are obtained by the following steps: and (2) placing the silicon dioxide in polyvinyl alcohol for ultrasonic dispersion for 20-30min, then adding acrylic acid, silicone oil and a silane coupling agent, fully stirring and mixing, and filtering to obtain the final inorganic particles. The silica is calculated by 10 parts by weight, and the rest raw materials are respectively: 40 parts of polyvinyl alcohol, 12 parts of acrylic acid, 26 parts of silicone oil and 2 parts of a silane coupling agent.

When the microfibrillated waste paper fiber is used, the microfibrillated waste paper fiber can partially replace starch, is added into a pulp flushing white water tank, is pumped into a screen in front of a screen through a pulp flushing pump to replace part of retention and filtration aids, and the finished paper tightness of the obtained finished paper pulp is 0.90g/cm³The burst index is 2.8 kPa.m²(iv)/g, ring pressure index 12 N.m/g; the using amount of starch in the pulp is reduced by 50 percent, the unit consumption is reduced to 1kg/t of paper, and the annual cost is saved by about 160 ten thousand yuan; the dosage of other chemical additives is reduced by 10 percent, and the annual cost is saved by about 100 ten thousand yuan.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.