CN102582006B - Non coagulant method butyronitrile latex film-forming process on cotton courage - Google Patents

Abstract

The present invention relates to a kind of non-coagulant method nitrile latex film-forming process on cotton liner, comprising the following steps: (1) adjusting the viscosity of nitrile latex solution; (2) controlling the temperature of the mold itself on the production line; (3) suiting The mold of the cotton liner enters in the nitrile latex solution; (4) integral film formation; (5) the cotton liner after the integral film formation is immersed in the non-thickened nitrile latex solution; (6) the cotton liner is completely Curing and forming. The present invention is a non-coagulant-method nitrile latex film-forming process on cotton liner with reasonable design, simple process and high production efficiency. The nitrile film formed by this process has high strength, good abrasion resistance and oil resistance , high surface finish, and is an important non-coagulant method for clean production today and in the future.

Description

Film-forming process of nitrile latex on cotton liner by non-coagulant method

technical field

The invention relates to a film-forming process of nitrile latex in the field of oil-resistant gloves, in particular to a film-forming process of nitrile latex on cotton liner by non-coagulant method.

Background technique

The Ca(NO ₃ ) ₂ , CaCl ₂ methanol coagulant method has become an important method for the production of oil-resistant gloves from nitrile latex due to its advantages of fast film formation and difficult penetration. Although this method is widely used, it also has Many defects: poor strength, non-abrasion resistance, and poor surface brightness as the formed nitrile film. The processing process needs washing, dehydration and drying operations. The production process has caused great adverse effects.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a kind of non-coagulant method nitrile latex in the cotton liner that can improve the strength and wear resistance of the nitrile film after molding, improve the surface brightness of the film, and ensure the quality of the finished product. film-forming process.

The present invention solves its technical problem and realizes through the following technical solutions:

A kind of non-coagulant method nitrile latex film-forming process on cotton liner, it is characterized in that: comprise the following steps:

(1) adopt thickener to adjust the viscosity of nitrile latex solution to 200-300cp;

(2) Control the temperature of the mold itself on the production line to be 65-80°C;

(3) The mold with the cotton liner is put into the nitrile latex solution according to the rotation speed of 20rpm-30rpm and a certain angle, and the nitrile latex makes the surface of the cotton liner form a uniform liquid film;

(4) After the mold treated in step (3) leaves the dipping tank, let the mold go down for three minutes to drain the excess nitrile latex solution on the surface of the cotton liner, let the mold dry naturally while rotating, and then put the suit on The mold of the cotton liner is placed in an oven at 50-70°C for about 15 minutes to make it solidify as a whole;

(5) the cotton liner after integral film forming in step (4) is impregnated in the non-thickened nitrile latex solution while rotating, the concentration of its latex solution is regulated by water, controls the weight requirement of product film;

(6) The mold with the cotton liner is left from the unthickened nitrile latex solution, and the excess nitrile latex solution on the surface of the cotton liner is drained from the mold for three minutes and dried naturally, and then put into the oven to make it Curing, the drying temperature is gradually increased from 90°C to 110°C to vulcanize the film until it is fully cured and formed.

And, the thickener described in step (1) is sodium polyacrylate.

And, the mold described in the step (3) enters at an angle of 20-40° with the nitrile latex solution.

Moreover, the part of the cotton liner described in the step (3) that is not impregnated utilizes the characteristics of the mold rotation to pour the nitrile latex liquid for about 3 seconds manually or automatically.

Moreover, sulfur bodies have been added to the non-thickened nitrile latex solution described in step (5).

Moreover, the mold with the cotton liner is in a rotating state throughout the process.

Advantage of the present invention and beneficial effect are:

1. In this film-forming process, sodium polyacrylate thickener is used to adjust the viscosity of latex to 200-300cp. The viscosity is moderate, and the amount of thickener added is limited, which ensures the film-forming quality of nitrile latex and avoids seepage. Glue phenomenon, enhance the oil resistance and water resistance of gloves.

2. In this film-forming process, the temperature of the mold itself is 65-80°C, and the thermosetting film-forming characteristics of nitrile rubber are used to further prevent the occurrence of glue seepage.

3, in this film-forming process, mold and nitrile latex solution enter at an angle of 20-40 °, and the mold enters and leaves the process of nitrile latex solution to continuously rotate, shortening the residence time of cotton liner in the solution as much as possible, so It can reduce the glue seepage caused by the pressure deep in the solution, and improve the uniformity of the nitrile rubber film.

4. In this film-forming process, the mold equipped with cotton liner drench off the excess nitrile latex solution, and then it is naturally dried and solidified while rotating, and then put into an oven at a certain temperature to form and solidify as a whole. This process omits Washing and drying steps simplify the process flow and improve processing efficiency and product quality.

5. This production process does not require the use of chemicals, such as methanol, _CaCl2 , etc., and does not require the use of water, so the entire production process is not only environmentally friendly and pollution-free, but also reduces energy consumption.

6. The present invention is a film-forming process of non-coagulant method nitrile latex on cotton liner with reasonable design, simple process and high production efficiency. The nitrile film formed by this process has high strength, wear resistance and oil resistance With good performance and high surface finish, it is an important non-coagulant method for clean production today and in the future.

Detailed ways

The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

A kind of non-coagulant method nitrile latex film-forming process on cotton liner, comprises the following steps:

(1) The viscosity of the nitrile latex solution is adjusted to 200-300cp by a thickener, which is sodium polyacrylate.

(2) Control the temperature of the mold itself on the production line to be 65-80°C.

(3) The mold with the cotton liner is rotated into the nitrile latex solution at a speed of 20-30 revolutions per minute, and the mold enters at an angle of 20-40° with the nitrile latex solution, and the nitrile latex makes the surface of the cotton liner uniformly formed of liquid film. The part of the cotton liner that is not impregnated is poured with nitrile latex for about 3 seconds by using the characteristics of mold rotation.

(4) After the mold treated in step (3) leaves the dipping tank, let the mold go down for three minutes to drain the excess nitrile latex solution on the surface of the cotton liner, let the mold dry naturally while rotating, and then put the suit on The mold of the cotton liner is placed in an oven at 50-70°C for about 15 minutes to make it solidify into a film as a whole. During production, the drying and film-forming time can be adjusted according to the actual production line requirements.

(5) the mold after integral film forming in step (4) is immersed in the non-thickened nitrile latex solution (adding sulfur body) while rotating while rotating, adjust the concentration of latex solution by distilled water, control product weight, make The weight of the cotton liner meets the customer's requirements.

(6) The mold with the cotton liner is left from the unthickened nitrile latex solution, and the excess nitrile latex solution on the surface of the cotton liner is drained from the mold for three minutes and dried naturally, and then put into the oven to make it Curing, the drying temperature is gradually increased from 90°C to 110°C to vulcanize the film until it is fully cured and formed. In this processing technology, the mold with the cotton liner is always in a rotating state during the entire processing process.

Example 1

A kind of non-coagulant method nitrile latex film-forming process on cotton liner, comprises the following steps:

(1) The viscosity of the nitrile latex solution is adjusted to 200cp by a thickener, which is sodium polyacrylate.

(2) Control the temperature of the mold itself on the production line to be 65-80°C.

(3) the mold that has been fitted with the cotton liner is rotated into the nitrile latex solution according to the speed of 20 revolutions per minute, and the mold enters at an angle of 20° with the nitrile latex solution, and the nitrile latex makes the surface of the cotton liner form a uniform liquid film. The part of the cotton liner that is not impregnated is poured with nitrile latex for about 3 seconds by using the characteristics of mold rotation.

(4) After the mold treated in step (3) leaves the dipping tank, let the mold go down for three minutes to drain the excess nitrile latex solution on the surface of the cotton liner, let the mold dry naturally while rotating, and then put the suit on The mold of the cotton liner is placed in an oven at 50-70°C for about 15 minutes to make it form a film and solidify as a whole. During production, the drying and film forming time can be adjusted according to the requirements of the actual production line.

(5) Immerse the cotton liner after the overall film formation in step (4) while rotating it into the nitrile latex solution without thickener (sulfur body has been added), and control the film-forming quality of the product by distilled water and immersion time , so that the weight of the cotton liner meets the customer's requirements.

(6) The mold with the cotton liner is left from the unthickened nitrile latex solution, and the excess nitrile latex solution on the surface of the cotton liner is drained from the mold for three minutes and dried naturally, and then put into the oven to make it Curing, the drying temperature is gradually increased from 90°C to 110°C to vulcanize the film until it is fully cured and formed. In this processing technology, the mold with the cotton liner is always in a rotating state during the entire processing process.

Example 2

A kind of non-coagulant method nitrile latex film-forming process on cotton liner, comprises the following steps:

(1) The viscosity of the nitrile latex solution is adjusted to 250 cp by a thickener, which is sodium polyacrylate.

(2) Control the temperature of the mold itself on the production line to 70°C.

(3) the mold that has been fitted with the cotton bladder is rotated into the nitrile latex solution according to the speed of 25 revolutions per minute, and the mold enters at an angle of 30° with the nitrile latex solution, and the nitrile latex makes the surface of the cotton bladder form a uniform liquid film. The part of the cotton liner that is not impregnated is poured with nitrile latex for about 3 seconds by using the characteristics of mold rotation.

Steps (4)-(6) are the same as in Example 1.

Example 3

A kind of non-coagulant method nitrile latex film-forming process on cotton liner, comprises the following steps:

(1) The viscosity of the nitrile latex solution is adjusted to 300cp by a thickener, which is sodium polyacrylate.

(2) Control the temperature of the mold itself on the production line to be 80°C.

(3) the mold that has been fitted with the cotton bladder is rotated into the nitrile latex solution according to the speed of 30 revolutions per minute, and the mold enters at an angle of 40° with the nitrile latex solution, and the nitrile latex makes the surface of the cotton bladder form a uniform liquid film. The part of the cotton liner that is not impregnated is poured with nitrile latex for about 3 seconds by using the characteristics of mold rotation.

Steps (4)-(6) are the same as in Example 1.

Claims (6)

1. non coagulant method butyronitrile latex film-forming process on cotton courage, is characterized in that: comprise the following steps:

(1) adopt thickener that the viscosity of butyronitrile latex solution is adjusted to 200-300cp;

(2) temperature of production control line mold self is 65-80 DEG C;

(3) mould being set with cotton courage enters into butyronitrile latex solution according to 20rpm-30rpm rotary speed and certain angle, and butyronitrile latex makes cotton courage surface form uniform liquid film;

(4) mould after step (3) process leaves dipping tank, after allowing mould downward three minutes pouring drops fall the butyronitrile latex solution of cotton courage excess surface, mould is first allowed to rotate while natural drying, and then the mould being set with cotton courage put into the baking oven of 50-70 DEG C, about about 15 minutes, make it the solidification of overall film forming;

(5) rotate the cotton courage after overall film forming in step (4) while be impregnated in the butyronitrile latex solution of non-thickening, the concentration of its latex solution is regulated by water, controls the weight demands of product glued membrane;

(6) leave in the butyronitrile latex solution of the mould making to be set with cotton courage never thickening, downward three minutes of mould drench drop fall cotton courage excess surface butyronitrile latex solution and after natural drying, put into baking oven again and make it solidification, baking temperature is increased to 110 DEG C gradually by 90 DEG C and makes glued membrane sulfuration, until whole curing molding.

2. non coagulant method butyronitrile latex according to claim 1 film-forming process on cotton courage, is characterized in that: the thickener described in step (1) is Sodium Polyacrylate.

3. non coagulant method butyronitrile latex according to claim 1 film-forming process on cotton courage, is characterized in that: the mould described in step (3) becomes 20-40 ° of angle to enter with butyronitrile latex solution.

4. non coagulant method butyronitrile latex according to claim 1 film-forming process on cotton courage, it is characterized in that: the feature that the part that the cotton courage described in step (3) is not impregnated into utilizes mould to rotate, water with artificial or automated manner and drench butyronitrile latex liquid about 3 seconds.

5. non coagulant method butyronitrile latex according to claim 1 film-forming process on cotton courage, is characterized in that: added sulphur body in the butyronitrile latex solution of the non-thickening described in step (5).

6. non coagulant method butyronitrile latex according to claim 1 film-forming process on cotton courage, is characterized in that: the mould of the cotton courage of described suit is in rotation status in whole technical process always.