阅读说明：本技术 一种低温前处理剂及其制备方法和应用 (Low-temperature pretreatment agent and preparation method and application thereof ) 是由 徐蓓蓓 袁昂 孟祥玲 程凯朋 于 2020-05-07 设计创作，主要内容包括：本发明公开了一种低温前处理剂,组分包括：双氧水催化剂、非离子表面活性剂、阴离子表面活性剂、分散剂、改性聚硅氧烷、去离子水。本发明再公开了一种如前所述低温前处理剂的制备方法。本发明还公开了一种如前所述低温前处理剂的应用。本发明的低温前处理剂用于棉织物的前处理,处理温度可以比传统工艺降低20℃至30℃,减少蒸汽用量20％,节约能源；工艺流程短,可以提高效率；处理过程中产生泡沫少,可减少设备故障的发生；织物处理后有优良的白度和毛效,棉籽壳去除率高原料成本低,可以降低染厂生产成本。(The invention discloses a low-temperature pretreatment agent, which comprises the following components: hydrogen peroxide catalyst, nonionic surfactant, anionic surfactant, dispersant, modified polysiloxane and deionized water. The invention also discloses a preparation method of the low-temperature pretreatment agent. The invention also discloses an application of the low-temperature pretreatment agent. The low-temperature pretreatment agent is used for pretreating cotton fabrics, the treatment temperature can be reduced by 20-30 ℃ compared with the traditional process, the steam consumption is reduced by 20%, and the energy is saved; the process flow is short, and the efficiency can be improved; the foam generated in the treatment process is less, so that the equipment failure can be reduced; the fabric treated by the method has excellent whiteness and capillary effect, the cottonseed hull removal rate is high, the material cost is low, and the production cost of a dye factory can be reduced.)

1. The low-temperature pretreatment agent is characterized by comprising the following components in percentage by weight: 6-15% of hydrogen peroxide catalyst, 20-30% of nonionic surfactant, 5-10% of anionic surfactant, 3-8% of dispersing agent, 0-1% of modified polysiloxane and the balance of deionized water.

2. The low-temperature pretreatment agent according to claim 1, wherein the hydrogen peroxide catalyst is a transition metal salt compound.

3. The low-temperature pretreatment agent according to claim 1, wherein the nonionic surfactant is one or more of fatty alcohol-polyoxyethylene ether, a random block polyether compound and a multi-carbon monocyclic dibasic acid.

4. The low-temperature pretreatment agent according to claim 1, wherein the anionic surfactant is a secondary sodium alkylsulfonate and/or a fatty acid methyl ester ethoxylated sulfonate.

5. The low-temperature pretreatment agent according to claim 1, wherein the dispersant is one or more of a high-molecular polyacrylate, a silicate and an alkali metal phosphate.

6. A method for preparing the low-temperature pretreatment agent according to any one of claims 1 to 5, comprising the steps of:

s1, adding deionized water, heating to 35-45 ℃, and heating in a water bath;

s2, adding a nonionic surfactant and an anionic surfactant, stirring at 200-500rpm for 5-10 minutes;

s3, adding a hydrogen peroxide catalyst, stirring at 30-60rpm for 5-10 minutes;

s4, adding a dispersing agent and modified polysiloxane, and stirring for 5-10 minutes;

s5, stopping stirring to obtain a prepared pretreatment agent;

and S6, standing and cooling to room temperature to obtain the low-temperature pretreatment agent.

7. The application of the low-temperature pretreatment agent as claimed in any one of claims 1 to 5, which is used for a dyeing pretreatment process of cotton and blended fabrics thereof, and comprises the following steps:

s1, boiling and bleaching: boiling and bleaching the cotton and blended fabric grey cloth in a boiling and bleaching bath at 65-80 ℃ for 30-60 min;

s2, treating biological enzyme and inactivating the enzyme.

8. The application of claim 7, wherein the scouring and bleaching bath formula comprises 1.5-3 g/L of low-temperature pretreatment agent, 1-2 g/L of flake caustic soda, 3-5 g/L of hydrogen peroxide and the balance of water.

9. The use of claim 8, wherein the scouring and bleaching bath formulation is added in the order of adding the low temperature pretreatment agent, the flake caustic soda, and the hydrogen peroxide solution in water.

10. The use according to claim 7, wherein the enzyme inactivation is water washing with hot water at 80 ℃.

Technical Field

The invention relates to the field of low-temperature pretreatment agents, in particular to a low-temperature pretreatment agent and a preparation method and application thereof.

Background

The cotton fiber as a natural fiber has excellent wearability after being processed by weaving, dyeing and finishing, and occupies a large proportion in the fabric market. The cotton fabric which is not dyed and finished contains natural impurities such as pigment, wax, cottonseed hulls and the like, and impurities such as oiling agent and the like which are added in the textile processing process. The presence of these impurities makes the cotton fabric yellow in color and poor in water absorption, which is not conducive to subsequent dyeing processing. Therefore, before the dyeing process, the cotton fabric is usually pretreated to remove various impurities and improve the whiteness and water absorption of the cotton fabric, so that the cotton fabric meets the requirements of subsequent dyeing and finishing processing. It is known that temperature is an important factor in the pretreatment of cotton, and high temperature is beneficial to removing impurities on cotton fabrics. In the existing process, the conventional pretreatment temperature is usually 98 ℃, sometimes the temperature is increased to 120 ℃ in order to shorten the process time, a large amount of energy is consumed, meanwhile, the cotton fabric has poor hand feeling and reduced strength. By adopting a pretreatment process with lower temperature, the flatness, crease marks, scratches, fuzzing and strong damage of the fabric can be obviously improved, the utilization rate of hydrogen peroxide in the pretreatment process can be improved, the whiteness and capillary effect are ensured, the steam consumption is reduced, the energy is saved, the processing time is shortened, the production efficiency is improved, and the energy consumption is reduced.

Although there are reports and applications related to low-temperature pretreatment auxiliaries at present, the problems of more foams, unclean cottonseed hulls removal, and poor whiteness and capillary effect exist in the use of the auxiliaries, and the application of a low-temperature pretreatment process is limited. Most of the low-temperature pretreatment agents can only be applied to pretreatment of dark cotton fabrics.

Disclosure of Invention

The invention aims to provide a low-temperature pretreatment agent, a preparation method and application thereof, aiming at the defects in the prior art, so that the effect of the traditional pretreatment process can be achieved at a lower temperature, and better capillary effect and whiteness can be obtained.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a low-temperature pretreatment agent, which comprises the following components in percentage by weight: 6-15% of hydrogen peroxide catalyst, 20-30% of nonionic surfactant, 5-10% of anionic surfactant, 3-8% of dispersing agent, 0-1% of modified polysiloxane and the balance of deionized water.

Preferably, the hydrogen peroxide catalyst is a transition metal salt compound.

Preferably, the nonionic surfactant is one or more of fatty alcohol-polyoxyethylene ether, a random block polyether compound and a multi-carbon monocyclic dibasic acid.

Preferably, the anionic surfactant is a secondary sodium alkyl sulfonate and/or a fatty acid methyl ester ethoxylated sulfonate.

Preferably, the dispersant is one or more of high molecular polyacrylate, silicate and alkali metal phosphate.

The second aspect of the present invention provides a method for preparing the low temperature pretreatment agent, comprising the steps of:

s1, adding deionized water, heating to 35-45 ℃, and heating in a water bath;

s2, adding a nonionic surfactant and an anionic surfactant, stirring at 200-500rpm for 5-10 minutes;

s3, adding a hydrogen peroxide catalyst, stirring at 30-60rpm for 5-10 minutes;

s4, adding a dispersing agent and modified polysiloxane, and stirring for 5-10 minutes;

s5, stopping stirring to obtain a prepared pretreatment agent;

and S6, standing and cooling to room temperature to obtain the low-temperature pretreatment agent.

The third aspect of the invention provides an application of the low-temperature pretreatment agent, which is used for a dyeing pretreatment process of cotton and blended fabrics thereof, and comprises the following steps:

s1, boiling and bleaching: boiling and bleaching the cotton and blended fabric grey cloth in a boiling and bleaching bath at 65-80 ℃ for 30-60 min;

s2, treating biological enzyme and inactivating the enzyme.

Preferably, the scouring and bleaching bath formula comprises 1.5-3 g/L of low-temperature pretreatment agent, 1-2 g/L of flake caustic soda, 3-5 g/L of hydrogen peroxide and the balance of water.

Preferably, the adding sequence of the scouring and bleaching bath formula comprises the steps of firstly adding the low-temperature pretreatment agent, then adding the caustic soda flakes and finally adding the hydrogen peroxide into water.

Preferably, the enzyme inactivation is water washing with hot water at 80 ℃.

By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

the low-temperature pretreatment agent is used for pretreating cotton fabrics, the treatment temperature can be reduced by 20-30 ℃ compared with the traditional process, the steam consumption is reduced by 20%, and the energy is saved; the process flow is short, and the efficiency can be improved; the foam generated in the treatment process is less, so that the equipment failure can be reduced; the fabric has excellent whiteness and capillary effect after being treated, and the cottonseed hull removal rate is high; the raw material cost is low, and the production cost of a dye house can be reduced.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.