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Production process for rubber foam material by means of compression molding

A production process and technology of foaming materials, applied in the field of production process of rubber products, can solve the problems such as the elaboration and quantification of the degree of unpre-crosslinking, and achieve the effects of reducing weight, preventing gas overflow, and improving use efficiency.

Inactive Publication Date: 2014-01-29
CHINA LEATHER & FOOTWEAR IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above research reports all adopt a two-step vulcanization method to prepare rubber foam materials, and pre-crosslink by adding a small amount of vulcanizing agent for dynamic vulcanization, radiation crosslinking, low-temperature molding, etc., to achieve the matching of the vulcanization process and the foaming process. The degree of pre-crosslinking is not described and quantified

Method used

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  • Production process for rubber foam material by means of compression molding
  • Production process for rubber foam material by means of compression molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0027] Examples 1-6: Comparison of the effects of different pre-crosslinking degrees on rubber molding foaming.

[0028] The mixing process of the mixed rubber: the preparation and performance test results of the rubber foam materials of Comparative Example 1 and Examples 1-6 are shown in Table 1. According to the ratio of raw materials in Table 1, plasticize NR and SBR in the range of 40-50°C respectively with an open mill, and adjust the roller distance of the open mill to 2-3 mm to make it reach a certain degree of plasticity. Standby; adjust the roller distance of the open mill to 1mm, then knead BR, add SBR in turn after wrapping the rolls, and make triangular bags 3 to 5 times after NR is evenly mixed, add reinforcing agent, oxidation Zinc, zinc stearate, PEG, DEG, coupling agent, naphthenic oil, foaming agent OBSH, anti-aging agent and accelerator. After the rubber is mixed and mixed, the temperature of the mixing roller is controlled at 50 ° C ~ 60 ° C Within the rang...

example 7～8

[0031] Examples 7-8: Comparing the influence of different foaming agents on rubber molding foaming in one-step method and two-step method.

[0032] The preparation and performance test results of the rubber foam materials of Comparative Examples 1-3 and Examples 7-8 are shown in Table 2. According to the ratio of raw materials in Table 2, the mixing process of the rubber compound is the same as in Examples 1-6. Comparative examples 1 to 3 adopt a one-step molding method, and the process conditions are 150°C×T 90 , Embodiment 7~8 adopts quantitative pre-vulcanization molding method, the condition of the first step pre-vulcanization is 120 ℃ × T 30 (the time corresponding to the degree of pre-crosslinking being 30%), the vulcanization condition of the second step molding method is 150 ℃ × (T 90 -T 30 ), to prepare rubber molded foam materials with different foaming agents. It can be seen from Table 2 that compared with the foamed material without pre-crosslinking, the foamin...

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Abstract

The invention provides a production process for a rubber foam material by means of compression molding, which integrates a rotor-free vulcameter with a practical compression molding method, and introduces a pre-crosslinking degree accurate control method into a traditional two-step compression molding foaming production process of rubber, so that prevulcanization of the rubber is realized. Adopting different pre-crosslinking degrees to control a starting point of vulcanization effectively realizes mutual match of vulcanization and foaming, and the rubber foam material with the apparent density of 0.523-0.909g / cm3 and linear shrinkage of 3.88%-9.55% can be prepared by the process. The production process has the advantages that the match point of vulcanization and foaming can be quickly and accurately found, the use ratio of foaming agents is increased, profit margin is increased, and energy is saved. Besides, the production process can effectively decrease the linear shrinkage of the rubber foam material, and improve dimensional stability of products.

Description

(1) Technical field [0001] The invention relates to a production process of rubber products, in particular to a production process of rubber molded foam material. (2) Background technology [0002] Rubber foam material is also called porous rubber, sponge rubber or foam rubber. The rubber foam material is characterized by light weight, good elasticity, shock absorption, sound insulation, heat insulation, large adjustment range of physical properties, and high cost performance. It has been widely used in aviation, automobiles, instruments, meters, home appliances, packaging, and shoemaking. , sporting goods and so on. [0003] The molding methods of rubber foam materials usually include molded foaming method and free foaming method. These two methods have different requirements for the formulation of rubber materials. The foam molding process of rubber includes two simultaneous reactions, namely, the vulcanization reaction of rubber and the decomposition reaction of foaming...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00C08L9/00C08L9/06C08L23/16C08K13/02C08K3/36C08K3/06C08J9/10C08J9/08B29C35/02
Inventor 常素芹王旭钟宁庆
Owner CHINA LEATHER & FOOTWEAR IND RES INST