1. The protection principle of acid-proof and oil-resistant water-repellent fabrics is basically the same, which is to change the characteristics of the fabric fiber surface through finishing process. Generally, liquid drops on the solid surface, due to the surface tension and interaction between liquid and solid. Causing the droplets to form various shapes. As shown in Figure L, when contact Angle e=lao0, the liquid drops are in the shape of beads, which is an ideal non-humid state, which is the ultimate goal of fabric protection against harmful liquids. However, because there is always some adhesion between the two phases, the situation that the contact Angle is equal to} so0 has never happened, and only some approximate cases can be obtained at most. For example}bo0 or greater. When e = o0, that is, the liquid drop is paved on the solid surface, which is the limit state that the solid surface is wet by the liquid drop. Generally, the unfinished fabric is in this state when it contacts with the liquid. Finishing the surface of the fabric is to make the contact Angle e as large as possible, so that the liquid is always in bead shape on the surface of the fabric, in order to achieve the purpose of non-wetting and non-adhesion. 2. Protective performance aramid paper factory
(1) acid proof work clothes acid and alkali proof fabric work clothes are engaged in acid operation personnel with acid proof work clothes, it is made of acid proof fabric, in the structure should meet the collar tight, cuff tight and tight hem, and can not have bright pockets, such as pockets must be added to cover production requirements. According to the standard of GB12012-89 “acid proof work clothes”, there are the following main indicators for the inspection of acid proof work clothes. Acid penetration time: refers to the time of acid penetration from the surface of the feed to the inside, expressed in minutes. aramid paper factory The longer the time, the better the performance. Antistatic cloth, acid repellent: refers to the non-adhesion performance of the surface of the service under the action of acid, expressed by the efficiency index, the higher the percentage, the more difficult the acid adhesion. Reduction rate of acid leaching strength: refers to the change rate of tearing strength of the service after acid etching. The smaller the change, the better. When we use acid-proof work clothes, we should first pay attention to whether these main performance indicators on the inspection report provided by the manufacturer meet the standard requirements, which is an important step to ensure our work safety.
(2) Anti-oil and water-repellent anti-static fabric protective clothing anti-oil and water-repellent protective clothing is mainly used for frequent contact with oil and water medium operating environment, such as oil, downhole and machining operations, its main protection indicators are anti-oil and water-repellent. Oil resistance is the white mineral oil and n-heptane according to the proportion of 20% and 80%, its score is 130 points; According to 70% and 30% ratio, its score is 80 points. aramid paper factory Put a drop of the matched liquid on the oil and water repellent protective suit. After 3 minutes, observe the fabric at the bottom of the liquid drop from a 45 degree Angle to see if it is reflective and shiny, then the fabric is not wet; If the bottom of the fabric darkens or drops spread, it is wet. The oil repellent value shall not be less than 130 points before washing; After washing for 30 times, the oil repellent value shall not be less than 80 points. Water repellent is the method of spraying water to the surface of the fabric, the fabric and the horizontal line at a 45 degree Angle, the water flow is perpendicular to the horizontal direction of spraying, observe the degree of water on the surface, different water repellent performance of water selling conditions are different (Figure 2)} water repellent grade description: Level 1 – all wet on the surface 2 – half wet on the surface, wrinkle-proof ironing cloth, which usually refers to the sum of a small piece of unconnected wetting area. Level 3 – Wet surface with only small areas that are not connected. Level 4 – there is no wetting on the surface, but there are small drops of water on the surface Level 5 – there is no wetting on the surface, and there are no small drops of water on the surface. According to the method described above, users can also conduct a simple performance evaluation of anti-oil and water-repellent protective clothing at ordinary times. Although the detection means can not be very standard, the general protection performance of anti-acid and alkali fabric protective clothing can be judged.
Post time: Jan-29-2023