Method for improving hydrophilicity of cocoon shells through low-temperature contact steaming of dried cocoons

Abstract

The invention belongs to the technical field of contact steaming pre-treatment of dried cocoons and in particular relates to a method for improving hydrophilicity of cocoon shells through low-temperature contact steaming of the dried cocoons. The method comprises the following steps: putting selected cocoons into finishing liquid and immersing; immersing for 40 to 60min under the condition that the temperature is 35 to 45 DEG C; after finishing immersion, preserving for 1 to 2h in a dark place under the condition that the temperature is 4 to 6 DEG C; setting contact steaming temperature to be80 DEG C in a steam contact steaming machine; after keeping for 5 to 10min, adjusting the contact steaming temperature to be 50 DEG C; continually keeping for 30 to 40min. Compared with the prior art,the method provided by the invention has the advantages that before contact steaming treatment, the finishing liquid is used for treating; the cocoons can be properly treated under the relatively lowtemperature condition of 50 to 80 DEG C, so that the anti-wetting performance of the cocoon shells can be changed; a finishing agent is adopted and cocoon shell uniform contact steaming and moistureabsorption of cocoon silks can be easily realized under short time and low temperature conditions, so that the wetting and osmosis effects can be improved.

Description

technical field [0001] The invention belongs to the technical field of pretreatment of dry cocoons by touch steaming, and in particular relates to a method for improving the hydrophilicity of cocoon layers by dry cocoon touch steaming at low temperature. Background technique [0002] The pretreatment of touch steaming in silk reeling refers to the use of saturated steam to carry out moist heat infiltration pretreatment on dry cocoons before cocoon cooking. Since the 1980s, domestic scholars have conducted a lot of research on the pre-treatment process of steaming from the aspects of technological conditions, mechanism of action, and influence on the performance of sericin and the quality of raw silk. Studies, for example, have verified that sericin undergoes denaturation during the pre-treatment process of contact steaming, resulting in densification of the aggregated structure, and hydrolysis occurs, resulting in a decrease in molecular weight and a change in the solubility...

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Problems solved by technology

[0002] The pretreatment of touch steaming in silk reeling refers to the use of saturated steam to carry out moist heat infiltration pretreatment on dry cocoons before cocoon cooking. Since the 1980s, domestic scholars have conducted a lot of research on the pre-treatment process of steaming from the aspects of technological conditions, mechanism of action, and influence on the performance of sericin and the quality of raw silk. Studies, for example, have verified that sericin undergoes denaturation during the pre-treatment process of contact steaming, resulting in densification of the aggregated structure, and hydrolysis occurs, resulting in a decrease in molecular weight and a change in the solubility of sericin; Influenced by consumption and other aspects, it is clear that the vacuum dynamic touch steaming technology can promote the quality of raw silkworm cocoons in silk-making enterprises; through the change of the contact angle value between the surface of the cocoon layer and the droplet after the touch steaming pretreatment, the infiltration of the cocoon layer can be improved Effect, when the contact steaming temperature was increased to 105°C and the contact steaming time was extended to 60 minutes, the change of the contact angle value reflected that the wettability and hydrophilicity of the cocoon layer had been significantly improved after the contact steaming pretreatment, but the contact steaming If the temperature is too high, the performance of silkworm cocoons will be affected, and if the contact steaming time is short, uneven contact steaming and uneven moisture absorption will occur. Therefore, how to improve the wettability and hydrophilicity of the cocoon layer under low temperature conditions needs further research

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